Page 2 - ESSENTIAL INSTRUCTIONS; READ THIS PAGE BEFORE PROCEEDING!; representative for clarification.; CAUTION
ESSENTIAL INSTRUCTIONS READ THIS PAGE BEFORE PROCEEDING! Rosemount Analytical designs, manufactures, and tests its products to meetmany national and international standards. Because these instruments aresophisticated technical products, you must properly install, use, and maintainthem to ensure they...
Page 3 - WHAT YOU NEED TO KNOW; BEFORE INSTALLING AND WIRING A ROSEMOUNT ANALYTICAL; THE MODEL NUMBER OF THE SENSOR; Also note the model option string.; THE TYPE OF TEMPERATURE ELEMENT; Write the temperature element RTD here; Balco 3K
WHAT YOU NEED TO KNOW BEFORE INSTALLING AND WIRING A ROSEMOUNT ANALYTICAL SENSOR TO THE MODEL 3081 pH/ORP TRANSMITTER 1. THE MODEL NUMBER OF THE SENSOR • Look on the label. • Also note the model option string. • If the label is missing or unreadable, see the flowcharts on pages 28 through 30. Write ...
Page 4 - Write the preamplifier location here; CAN YOU USE THE QUICK START GUIDE; you are NOT using a HART communicator,; Base Model
• If the sensor is wired directly to the transmitter, the preamplifier can be in either the sensor or the transmitter. • Look at the wires in the sensor cable. A GREEN wire means the preamplifier is in the sen- sor. An coaxial cable means the preamplifier is in the transmitter. A coaxial cable is an...
Page 5 - QUICK START GUIDE FOR MODEL 3081pH/ORP; FIGURE 2
QUICK START GUIDE FOR MODEL 3081pH/ORP Before using this Quick Start Guide, please read “WHAT YOU NEED TO KNOW BEFOREINSTALLING AND WIRING A ROSEMOUNT ANALYTICAL SENSOR TO THE MODEL 3081pH/ORP TRANSMITTER” on the preceding page. Section 1.1 Setup for the Models 381+-52, 385+-04, 396P-02-54, 396P-02-...
Page 6 - C different from the buffer, allow at least 20 min-; FIGURE 3
Section 2 Wiring A. Wire sensor Model 381+-55, 385+-03, or 396P-01-55 directly to the transmitter as shown in Figure 3.B. Wire sensor Model 381+-52, 385+-04, 396P-02-55, 396P-02-55, or 396R-54 as shown in Figure 4.C. Wire the 12 - 42.4 Vdc power supply to TB-15 (- 4 - 20 mA) and TB-16 (+ 4 - 20 mA)....
Page 7 - QUICK REFERENCE GUIDE
QUICK REFERENCE GUIDE MODEL 3081PH/ORP Automatic Buffer Calibration Note: A pH measurement is only as good as the calibration, and the calibration is only as good as the buffers used. For best results, calibrate with buffers having the same temperature as the process. Allow time for the sensor and b...
Page 8 - HART Communicator Fast Key Sequences; Technical Support Hotline:; DIAGNOSE; MENU; PROMPT; Menu Tree for pH
HART Communicator Fast Key Sequences Technical Support Hotline: For assistance with technical problems, please call the Customer Support Center (CSC). The CSC is staffed from5:00am to 5:00pm PST. Phone (US only): 800-854-8257 Phone: 949-757-8500 Fax: 949-863-9159 World Wide Web: www.raihome.com PROG...
Page 9 - MICROPROCESSOR TRANSMITTER; TABLE OF CONTENTS; Section Title
i MODEL 3081 pH/ORP TABLE OF CONTENTS MODEL 3081 PH/ORP MICROPROCESSOR TRANSMITTER TABLE OF CONTENTS Section Title Page 1.0 DESCRIPTION AND SPECIFICATIONS ................................................................ 1 1.1 Features ....................................................................
Page 10 - TABLE OF CONTENTS CONT’D; ii
MODEL 3081 pH/ORP TABLE OF CONTENTS TABLE OF CONTENTS CONT’D ii 8.0 PROGRAMMING FOR pH MEASUREMENTS ....................................................... 56 8.1 General .................................................................................................................... 56 8.2 Enter...
Page 11 - iii
iii MODEL 3081 pH/ORP TABLE OF CONTENTS TABLE OF CONTENTS CONT’D 13.0 pH MEASUREMENTS............................................................................................. 114 13.1 General ...........................................................................................................
Page 12 - iv; Number Title
iv MODEL 3081 pH/ORP TABLE OF CONTENTS TABLE OF CONTENTS CONT’D LIST OF FIGURES Number Title Page 2-1 Model 3081 pH/ORP Transmitter - Exploded Drawing of Circuit Board Stack ......... 8 2-2 Model 3081 pH/ORP Transmitter - Analog Board .................................................... 9 2-3 Model ...
Page 13 - TABLE OF CONTENTS - CONT’D
v MODEL 3081 pH/ORP TABLE OF CONTENTS TABLE OF CONTENTS - CONT’D LIST OF FIGURES - CONT’D Number Title Page 3-23 Procedure for Removing BNC Connector and Preparing Coaxial Cable for ............Connection to the Model 3081 pH/ORP Transmitter ................................................ 26 3-24 P...
Page 15 - DESCRIPTION AND SPECIFICATIONS; Features; • CHANGING FROM pH TO ORP operation takes only seconds.; The Model 3081pH/ORP Transmitter; REMOTE COMMUNICATIONS:; Menu formats for calibration and programming
1 MODEL 3081 pH/ORP SECTION 1.0 DESCRIPTION AND SPECIFICATIONS SECTION 1.0 DESCRIPTION AND SPECIFICATIONS 1.1 Features 1.2 Accessories 1.3 Specifications - General for Model 3081 pH/ORP 1.4 Specifications - pH 1.5 Specifications - ORP 1.6 Ordering Information • CHANGING FROM pH TO ORP operation take...
Page 16 - Year 2000 Compliance: Millennium Status
2 CALIBRATION: Two-point, temperature-corrected buffer calibration is standard. To reduce errors caused byimpatient operators, the Model 3081 pH/ORP transmitterdoes not accept calibration data until programmed stabil-ity limits have been met. If data are not acceptable, thetransmitter displays an er...
Page 17 - Power Supply and Load Requirements:; Hazardous Area Classification:; CENELEC: EEx ia IIC
3 MODEL 3081 pH/ORP SECTION 1.0 DESCRIPTION AND SPECIFICATIONS minimum voltage and loadfor HART communication 1.3 SPECIFICATIONS - GENERAL FOR MODEL 3081 pH/ORP Case: Cast aluminum containing less than 8% magnesium. NEMA 4X (IP65), NEMA 7 (explosion-proof)Epoxy-polyester paint, Neoprene O-ring seals...
Page 18 - ORDERING INFORMATION; The; MODEL; Continuously expandable
4 MODEL 3081 pH/ORP SECTION 1.0 DESCRIPTION AND SPECIFICATIONS 1.6 ORDERING INFORMATION The Model 3081 pH/ORP Smart two-wire microprocessor transmitter is housed in a NEMA 4X case. Communication with the transmitter is through a hand-held infrared remote controller, a Model 275 HART communicator, or...
Page 19 - MODEL 3081 pH/ORP TRANSMITTER-SENSOR COMPATIBILITY CHART; see note
5 MODEL 3081 pH/ORP SECTION 1.0 DESCRIPTION AND SPECIFICATIONS MODEL 3081 pH/ORP TRANSMITTER-SENSOR COMPATIBILITY CHART PREAMPLIFIER LOCATION Sensor-mounted Remote MODEL pH ORP Sensor junction box junction box Transmitter 320B x see note 320HP x see note x 330B x 328A x x x 370 x x x x 371 x x x x 3...
Page 20 - DESCRIPTION; ACCESSORIES
6 MODEL 3081 pH/ORP SECTION 1.0 DESCRIPTION AND SPECIFICATIONS MODEL/PN DESCRIPTION SHIPPING WEIGHT 515 DC loop power supply, see Section 1.2.1 for details 3 lb/1.0 kg 230A Two alarm module, see Section 1.2.2 for details 3 lb/1.5 kg 275 HART communicator, order from Rosemount Measurement - (800) 999...
Page 21 - UNPACKING AND INSPECTION; INSTALLATION; Unpacking and Inspection
2.1 UNPACKING AND INSPECTION Inspect the shipping container. If it is damaged, contact the shipper immediately for instructions. Save the box. If there isno apparent damage, remove the transmitter. Be sure all items shown on the packing list are present. If items are miss-ing, immediately notify Ros...
Page 22 - Changing Switch and Jumper Positions; Remove the three bolts holding the circuit board stack.
MODEL 3081 pH/ORP SECTION 2.0 INSTALLATION 8 FIGURE 2-1. Model 3081 pH/ORP Transmitter - Exploded Drawing of Circuit Board Stack 2.2.4 Preamplifier Location pH sensors produce a high impedance voltage signal that must be preamplified before use. The signal can be preampli-fied before it reaches the ...
Page 24 - There are more jumpers on the CPU; ORIENTING THE DISPLAY BOARD; MECHANICAL INSTALLATION
10 MODEL 3081 pH/ORP SECTION 2.0 INSTALLATION 6. There are more jumpers on the CPU board. Refer to Figure 2-3. Thesejumpers are factory set and should NOTneed to be moved. This step is for trou-bleshooting purposes only. Verify that jumpers JP-1, JP-3, and JP-4on the CPU board are in the positionssh...
Page 25 - NOTE
11 MODEL 3081 pH/ORP SECTION 2.0 INSTALLATION FIGURE 2-4. Mounting the Model 3081 pH/ORP Transmitter on a Flat Surface MILLIMETER INCH 4. Use weathertight cable glands to keep moisture out of the transmitter. 5. If conduit is used, plug and seal the connections at the transmitter housing to prevent ...
Page 28 - WIRING; GENERAL INFORMATION; General Information
14 MODEL 3081 pH/ORP SECTION 3.0 WIRING SECTION 3.0 WIRING 3.1 GENERAL INFORMATION pH and ORP sensors manufactured by Rosemount Analytical can be wired to the Model 3081 pH/ORP transmitter in threeways: 1. directly to the transmitter, 2. to a sensor-mounted junction box and then to the transmitter, ...
Page 29 - WIRING DIAGRAMS FOR pH and ORP SENSORS
MODEL 3081 pH/ORP SECTION 3.0 WIRING 3.2 WIRING DIAGRAMS FOR pH and ORP SENSORS Refer to Tables 3-1 through 3-12 to locate the appropriate wire function and wiring diagram. There is a separate table foreach model. The sensor models having the highest number appear first. If you do not know the model...
Page 32 - removing BNC and terminating cable. Wiring
18 MODEL 3081 pH/ORP SECTION 3.0 WIRING REMOVE BNC AND TERMINATE COAXIAL CABLE BEFORE WIRING SENSOR TOTRANSMITTER. SEE FIGURE 3-23. ALTERNATIVELY, USE A BNC ADAPTER (PN9120531) OR ORDER MODEL OPTION -62 (SENSOR WITH BNC REMOVED AND TER-MINATIONS COMPATIBLE WITH 3081 pH/ORP). IF USING A BNC ADAPTER, ...
Page 33 - and terminating cable. Wiring diagram for
19 MODEL 3081 pH/ORP SECTION 3.0 WIRING REMOVE BNC AND TERMINATE COAXIAL CABLE BEFORE WIRING SENSOR TOTRANSMITTER. SEE FIGURE 3-23. ALTERNATIVELY, USE A BNC ADAPTER (PN9120531) OR ORDER MODEL OPTION -62 (SENSOR WITH BNC REMOVED ANDTERMINATIONS COMPATIBLE WITH 3081 pH/ORP). IF USING A BNC ADAPTER,THE...
Page 34 - Wiring directly to the transmitter.; Wiring through a sensor-mounted junction
20 MODEL 3081 pH/ORP SECTION 3.0 WIRING FIGURE 3-10. Wire functions for Models 396R-50, 396R-54, 396R-54-61, 396P-02-50, 396P-02-54, 396P-02-55, 385+ -04, and 385+ -41-52. NOTES:1. PLACE PREAMPLIFIER SELECTION SWITCH S1 IN "TRANS- MITTER" POSITION (SEE SECTION 2.2). 2. IF SENSOR HAS 3K BALCO...
Page 42 - SENSOR FLOW CHART
28 MODEL 3081 pH/ORP SECTION 3.0 WIRING SENSOR FLOW CHART (continued on p age 29)
Page 45 - INTRINSICALLY SAFE & EXPLOSION PROOF; Intrinsically Safe Installations; FIGURE 4-1. Intrinsically Safe BASEEFA Model 3081 Label
31 4.1 INTRINSICALLY SAFE INSTALLATIONS The installation wiring, operating parameters, or agency tags for intrinsically safe operation are given in Figures4-1, 4-2, and 4-3. 4.2 EXPLOSION PROOF INSTALLATIONS The installation wiring and operating parameters for explosion proof operation are given in ...
Page 51 - OPERATION WITH REMOTE CONTROLLER; C A L I b r A t E; E X I T; Units of display; Displays; Temperature in °C or °F
37 MODEL 3081 pH/ORP SECTION 5.0 OPERATION WITH REMOTE CONTROLLER SECTION 5.0 OPERATION WITH REMOTE CONTROLLER CALIBRATE PROGRAM DIAGNOSE C A L I b r A t E E X I T N E X T E N T E R 7.00 pH MV F A U L T H O L D ♥ Appears when transmitteris in hold (see Section 8.3.2) Appears when a disablingconditio...
Page 55 - I d
41 5.7 SECURITY 5.7.1 General. Use the programmable security code to protect program and calibration settings from accidentally being changed. The transmitter is shipped with the security fea-ture disabled. To program a security code, refer to Section 8.6, Display Units. 5.7.2 Entering the Security ...
Page 56 - OPERATION WITH MODEL 275; FIGURE 6-1. Connecting the HART Communicator; For intrinsically safe CSA and FM
42 6.1 Note on Model 275 HART Communicator The Model 275 HART Communicator is a product of Rosemount Measurement. This section contains selectedinformation on using the Model 275 with the Rosemount Analytical Model 3081 pH/ORP Transmitter. For completeinformation on the Model 275 Communicator, see t...
Page 57 - Operation; Menu Tree
43 MODEL 3081 pH/ORP SECTION 6.0 OPERATION WITH MODEL 275 6.3 Operation 6.3.1 Off-line and On-line Operation The Model 275 Communicator features off-line and on-line communications. On-line means the communicator isconnected to the transmitter in the usual fashion. While the communicator is on line,...
Page 62 - CALIBRATION OF pH MEASUREMENTS; HoLd
48 MODEL 3081 pH/ORP SECTION 7.0 CALIBRATION OF pH MEASUREMENTS SECTION 7.0 CALIBRATION OF pH MEASUREMENTS 7.1 General 7.2 Entering and Leaving the Calibrate Menu 7.3 Using the Hold Function 7.4 Temperature Calibration 7.5 Auto Calibration 7.6 Manual Calibration 7.7 Making the Transmitter Reading Ma...
Page 63 - tEMP AAdJ; TEMPERATURE CALIBRATION; b. the temperature measurement is suspected of being in error.; Enter the CALIBRATE menu by pressing CAL on the IRC. The; the; CALIbrAtE; Press ENTER to display the temperature editing prompt.; tEMP AdJ; To leave the CALIBRATE menu, press EXIT .
49 CALIBRATE tEMP AAdJ EXIT NEXT ENTER CALIBRATE tEMP EXIT ENTER 0 25.0 MODEL 3081 pH/ORP SECTION 7.0 CALIBRATION OF pH MEASUREMENTS 7.4 TEMPERATURE CALIBRATION 7.4.1 Purpose 1. As discussed in Section 13.6, Glass Electrode Slope, measuring tempera-ture is an important part of measuring pH. The accu...
Page 65 - C A L bb F 11
7.5.4 Procedure 1. Refer to Section 8.7, Buffer Calibration Parameters. Verify that auto calibration is activated. Identifythe buffers being used and set the stability limits. 2. Enter the CALIBRATE menu by pressing CAL on the IRC. The CALIbrAtE sub-menu appears (pic- tured above left). 3. At the CA...
Page 66 - MANUAL CALIBRATION
52 MODEL 3081 pH/ORP SECTION 7.0 CALIBRATION OF pH MEASUREMENTS 7.6.1 Purpose 1. New sensors must be calibrated before use. Regular recalibration is also necessary. 2. Manual calibration is an alternative to auto calibration. Because auto calibration eliminates manycommon calibration errors, it is s...
Page 68 - MAKING THE TRANSMITTER READING MATCH A SECOND pH; The transmitter converts the difference between the pH readings,; rOFFSt
54 MODEL 3081 pH/ORP SECTION 7.0 CALIBRATION OF pH MEASUREMENTS 7.7 MAKING THE TRANSMITTER READING MATCH A SECOND pH METER (STANDARDIZATION). 7.7.1 Purpose 1. This section describes how to make the transmitter reading match the reading from asecond pH meter. The measurement made with the second mete...
Page 69 - Std
55 MODEL 3081 pH/ORP SECTION 7.0 CALIBRATION OF pH MEASUREMENTS CALIBRATE Std EXIT NEXT ENTER CALIBRATE SLOPE EXIT NEXT ENTER CALIBRATE Std EXIT NEXT ENTER 08 .00 5 9.00 7.7.3 Procedure 1. Enter the CALIBRATE menu by pressing CAL on the IRC. The CALibrAtE sub-menu appears (pictured above left). 2. A...
Page 70 - PROGRAMMING FOR pH MEASUREMENTS
56 MODEL 3081 pH/ORP SECTION 8.0 PROGRAMMING FOR pH MEASUREMENTS SECTION 8.0 PROGRAMMING FOR pH MEASUREMENTS 8.1 General 8.2 Entering and Leaving the Program Menu 8.3 Output Ranging 8.4 Diagnostic Parameters 8.5 Temperature Related Settings 8.6 Display Units 8.7 Buffer Calibration Parameters 8.8 Iso...
Page 72 - rEF FAIL
58 MODEL 3081 pH/ORP SECTION 8.0 PROGRAMMING FOR pH MEASUREMENTS 8.3 OUTPUT RANGING 8.3.1 Purpose This section describes how to do the following: 1. assign pH values to the 4 and 20 mA outputs, 2. set the output current generated by the transmitter during hold, 3. set the output current generated by...
Page 74 - DIAGNOSTIC PARAMETERS; This section describes how to do the following:; FIGURE 8-1. Suggested Glass Impedance Warning and Failure Limits
60 8.4 DIAGNOSTIC PARAMETERS 8.4.1 Purpose This section describes how to do the following: 1. change the standardization or reference offset, 2. enable and disable sensor diagnostics, 3. enable and disable glass impedance temperature compensation, 4. set the high and low warning and failure limits f...
Page 75 - FIGURE 8-2. Suggested Warning and Failure Limits for Low
61 4. REFERENCE IMPEDANCE. The majori-ty of reference electrodes used in indus-try are low impedance silver-silver chlo-ride electrodes. Every pH and ORP sen-sor manufactured by RosemountAnalytical has a low impedance refer-ence. However, there are applicationsthat call for either a high impedance s...
Page 76 - W J; O N
62 8.4.3 Procedure 1. Press PROG on the infrared remote controller (IRC). 2. Press NEXT until the diAGnOStIC sub-menu appear. Press ENTER . 3. The screen displays the rOFFSt prompt. Use the editing keys to change the flashing display to the desired standardization (reference) offset (in millivolts)....
Page 77 - rFH; rWJH; rWJL; rFL
63 12. The rFH prompt appears. Use the editing keys to change the display to the desired ref- erence electrode high impedance fault value. The allowed ranges are Type of reference electrode Allowed range Low impedance ( LO in step 11) 0 - 2000 kilohms High impedance ( HI in step 11) 0 - 2000 megohms...
Page 78 - TEMPERATURE RELATED SETTINGS
64 MODEL 3081 pH/ORP SECTION 8.0 PROGRAMMING FOR pH MEASUREMENTS 8.5 TEMPERATURE RELATED SETTINGS 8.5.1 Purpose This section describes how to do the following: 1. activate and deactivate automatic temperature compensation, 2. set a manual temperature compensation value, 3. match the transmitter to t...
Page 79 - tC; tAUtO; tMAn
65 8.5.3 Procedure 1. Press PROG on the infrared remote controller (IRC). 2. Press NEXT until the tEMP sub-menu appears in the display. Press ENTER . 3. The screen displays the tAUTO prompt. Press Ï or Ð to enable ( On ) or disable ( OFF ) automatic temperature compensation. Press ENTER to save. 4. ...
Page 80 - OUtPUt; CODE; tYPE; d I S P L A Y
66 8.6 DISPLAY UNITS 8.6.1 Purpose This section describes how to do the following: 1. switch the process display units between pH and ORP (millivolts), 2. select °C or °F for the temperature display, 3. select percent of full scale or milliamps for the output display, 4. program a security code. 8.6...
Page 81 - BUFFER CALIBRATION PARAMETERS
67 8.7 BUFFER CALIBRATION PARAMETERS 8.7.1 Purpose This section describes how to do the following: 1. activate or deactivate auto calibration, 2. identify which buffers will be used during auto calibration, 3. set the stability criteria for auto calibration. 8.7.2 Definitions 1. AUTO CALIBRATION. In...
Page 82 - bAUtO; bUFFEr; t I M E
68 3. STABILITY CRITERIA. For the Model 3081 pH/ORP transmitter to accept calibration data, the pH must remain within a specified range for a specified period of time. Thedefault values are 0.02 pH units and 10 seconds. In other words, at the default setting,calibration data will be accepted as soon...
Page 83 - ISOPOTENTIAL PARAMETERS
69 MODEL 3081 pH/ORP SECTION 8.0 PROGRAMMING FOR pH MEASUREMENTS 8.8 ISOPOTENTIAL PARAMETERS 8.8.1 Purpose This section describes how to do the following: 1. convert the pH at the measurement temperature to the pH at a reference temperature byentering a solution temperature coefficient, 2. change th...
Page 84 - Snr; I S O P O t n t A L; tCOEFF; I S O
70 8.8.3 Procedure 1. Press PROG on the infrared remote controller (IRC). 2. Press NEXT until the ISOPOtntAL sub-menu appears. Press ENTER . 3. The screen displays the tCOEFF prompt. Use the editing keys to change the display to the desired solution temperature coefficient. The allowed values are -0...
Page 85 - S I M OO U t P U t; GENERATING A TEST CURRENT; Press NEXT until the; SIM OUtPUt; tESt; Press ENTER to start the test current.
71 PROGRAM tESt EXIT ENTER 1 2.00 PROGRAM S I M OO U t P U t EXIT NEXT ENTER MODEL 3081 pH/ORP SECTION 8.0 PROGRAMMING FOR pH MEASUREMENTS 8.9 GENERATING A TEST CURRENT 8.9.1 Purpose This section describes how to generate output currents for testing recorders and data han-dling systems. 8.9.2 What h...
Page 86 - CALIBRATION OF ORP MEASUREMENTS; To activate or deactivate Hold, do the following:; prompt appears in the display. Press; On; and; OFF
72 MODEL 3081 pH/ORP SECTION 9.0 CALIBRATION OF ORP MEASUREMENTS SECTION 9.0 CALIBRATION OF ORP MEASUREMENTS 9.1 General 9.2 Entering and Leaving the Calibrate Menu 9.3 Using the Hold Function 9.4 Temperature Calibration 9.5 Standardization 9.1 GENERAL The Calibrate menu allows the user to calibrate...
Page 87 - TEMPERATURE CALIBRATION
73 CALIBRATE tEMP AAdJ EXIT NEXT ENTER CALIBRATE tEMP EXIT ENTER 0 25.0 MODEL 3081 pH/ORP SECTION 9.0 CALIBRATION OF ORP MEASUREMENTS 9.4 TEMPERATURE CALIBRATION 9.4.1 Purpose 1. As discussed in Section 14.6 (ORP, Concentration, and pH), ORP is afunction of temperature. The accuracy of a new sensor/...
Page 88 - OrP; , press EXIT twice to return to the main display.; Press EXIT to return to the main display.; Preparation of ORP Standard Solutions
74 9.5.3 Procedure 1. Place the transmitter in ORP mode. See Section 10.6.3, steps 1 - 3. Afterselecting and saving OrP , press EXIT twice to return to the main display. 2. Enter the CALIBRATE menu by pressing CAL on the IRC. The Std sub- menu appears. 3. Rinse the sensor with deionized water and pl...
Page 89 - PROGRAMMING FOR ORP MEASUREMENTS
75 10.1 GENERAL This section describes how to do the following: 1. assign ORP values to the 4 and 20 mA outputs, 2. set the current generated by the transmitter during hold, 3. set the current generated by the transmitter when a fault is detected, 4. change sensor diagnostic limits, 5. change the un...
Page 92 - OutPut
78 MODEL 3081 pH/ORP SECTION 10.0 PROGRAMMING FOR ORP MEASUREMENTS 10.3.3 Procedure 1. Enter the Program menu by pressing PROG on the IRC. The OutPut sub-menu appears. 2. Press ENTER. The screen displays the 4 MA prompt. Use the editing keys to change the displayed number to the desired ORP. The all...
Page 93 - DIAGNOSTIC PARAMETERS; FIGURE 10-1. Suggested Warning and Failure Limits
79 MODEL 3081 pH/ORP SECTION 10.0 PROGRAMMING FOR ORP MEASUREMENTS 10.4 DIAGNOSTIC PARAMETERS 10.4.1 Purpose This section describes how to do the following: 1. change the standardization (reference) offset, 2. enable and disable sensor diagnostics, 3. enable and disable glass impedance temperature c...
Page 94 - L O
80 MODEL 3081 pH/ORP SECTION 10.0 PROGRAMMING FOR ORP MEASUREMENTS PROGRAM rEF EXIT ENTER L O PROGRAM I M P t C EXIT NEXT ENTER O N PROGRAM rOFFSt EXIT ENTER PROGRAM d I A G n O S T I C EXIT NEXT ENTER 0 6 0 PROGRAM d I A G EXIT ENTER O F F 10.4.3 Procedure 1. Press PROG on the infrared remote contr...
Page 95 - w j
81 8. The rWH prompt appears. In the display, W appears as w j . Use the editing keys to change the display to the desired reference electrode high impedance warn-ing value. The allowed ranges are Type of reference electrode Allowed range Low impedance ( LO in step 6) 0 - 2000 kilohms High impedance...
Page 96 - TEMPERATURE ELEMENT
82 MODEL 3081 pH/ORP SECTION 10.0 PROGRAMMING FOR ORP MEASUREMENTS 10.5 TEMPERATURE ELEMENT 10.5.1 Purpose This section describes how to match the transmitter to the type of temperatureelement in the ORP sensor. 10.5.2 Definition TEMPERATURE ELEMENT: ORP sensors use a variety of temperature ele-ment...
Page 98 - GENERATING A TEST CURRENT; prompt appears. Use the editing keys to change the number to the
84 MODEL 3081 pH/ORP SECTION 10.0 PROGRAMMING FOR ORP MEASUREMENTS PROGRAM tESt EXIT ENTER 1 2 .00 PROGRAM S I M OO U t P U t EXIT NEXT ENTER 10.7 GENERATING A TEST CURRENT 10.7.1 Purpose This section describes how to generate output currents for testing recorders anddata handling systems. 10.7.2 Wh...
Page 99 - MAINTENANCE; TRANSMITTER MAINTENANCE
85 MODEL 3081 pH/ORP SECTION 11.0 MAINTENANCE SECTION 11.0 MAINTENANCE 11.1 OVERVIEW This section gives general procedures for routine maintenance of the 3081 pH/ORP transmitter and pH and ORPsensors. The transmitter needs almost no routine maintenance. Sensors require periodic inspection and cleani...
Page 100 - pH SENSOR MAINTENANCE
86 MODEL 3081 pH/ORP SECTION 11.0 MAINTENANCE TABLE 11-1. Replacement Parts for Model 3081 pH/ORP Transmitter PROBLEM CLEANING SUGGESTIONS Loose scale or debris Use a stream of water from a wash bottle to rinse away solids from the tip of the sensor. If water does not work, gently wipe the glass bul...
Page 101 - Rejuvenating Reference Electrodes; NOT BOILING; FIGURE 11-2. Checking the Potential of the Reference Electrode.
87 When using acid or alkaline solvents, be careful to keep the solvent away from the liquid junction. If the cleaning sol-vent contacts the junction, hydrogen ions (acid solvent) or hydroxide ions (alkaline solvent) will diffuse into the junc-tion. Because hydrogen and hydroxide ions have much grea...
Page 102 - ORP SENSOR MAINTENANCE; Install the sensor in the process stream.
88 11.4 ORP SENSOR MAINTENANCE 11.4.1 Frequency of Cleaning The frequency at which an ORP sensor should be inspected and cleaned can be determined only by experience. If theprocess liquid coats or fouls the sensor, frequent cleaning may be necessary. If the process does not contain a high levelof su...
Page 103 - TROUBLESHOOTING; When a WARNING condition exists:; The main display remains stable it does not flash.; Annunciation
89 MODEL 3081 pH/ORP SECTION 12.0 TROUBLESHOOTING SECTION 12.0 TROUBLESHOOTING 12.1 WARNING AND FAULT MESSAGES 12.2 CALIBRATION ERRORS 12.3 TROUBLESHOOTING - GENERAL 12.4 TROUBLESHOOTING WHEN A DIAGNOSTIC MESSAGE IS SHOWING 12.5 TROUBLESHOOTING WHEN NO DIAGNOSTIC MESSAGE IS SHOWING 12.6 SYSTEMATIC T...
Page 104 - CALIBRATION ERRORS; Std Err; TROUBLESHOOTING WHEN A DIAGNOSTIC MESSAGE IS SHOWING; MESSAGE
90 12.2 CALIBRATION ERRORS If an error occurs during calibration, an error message appears in the main display, and the transmitter does not updatethe calibration. The calibration errors are Std Err , SLOPE Err LO , and SLOPE Err HI . See Section 12.4 for an explana- tion of the error messages and s...
Page 110 - If the measured resistances are acceptable, go to step C.; Temperature
96 MODEL 3081 pH/ORP SECTION 12.0 TROUBLESHOOTING B. Check the sensor. Refer to the wiring diagrams in Section 3.0 to identify the RTD leads. Disconnect the RTD leads and measure theresistances shown in Figure 12-3. The measured resistance should agree with the value in Table 12-1 to within about 1%...
Page 111 - LInE FAIL; If the message is still showing go to step B.; FIGURE 12-4. Temperature simulation into
97 MODEL 3081 pH/ORP SECTION 12.0 TROUBLESHOOTING C. Check the transmitter. 1. Disconnect the RTD sensor leads and wire the circuit shown in Figure 12-4. Set the resistance to the value for 25°C shown in Table 12-1. The measured temperature should equal 25°C to within ±1°C. If the measured temperatu...
Page 112 - If the diagnostic message remains, go to step C.; InPUt WArn
98 MODEL 3081 pH/ORP SECTION 12.0 TROUBLESHOOTING B. The RTD sense or the RTD return wire inside the sensor cable may be broken. Keep the sensor wires attached and jumper TB-3 and TB-4. If the diagnostic message disappears, either the RTD return or RTD sense wire is broken. To verify a broken wire,d...
Page 113 - SLOPE Err LO
99 MODEL 3081 pH/ORP SECTION 12.0 TROUBLESHOOTING 12.4.9 SLOPE Err LO SLOPE Err LO means that a two-point buffer calibration attempt has failed. The slope is too low (<40 mV/pH) for a good measurement. Troubleshooting Flowchart-SLOPE Err LO A. Repeat the calibration. 1. Inaccurate buffers can cau...
Page 114 - SLOPE Err HI
100 MODEL 3081 pH/ORP SECTION 12.0 TROUBLESHOOTING 12.4.10 SLOPE Err HI SLOPE Err HI means that a two-point buffer calibration attempt has failed. The slope is too high (>62 mV/pH) for a good measurement. Troubleshooting Flowchart-SLOPE Err HI A. Repeat the calibration. 1. Inaccurate buffers can ...
Page 116 - TROUBLESHOOTING WHEN NO DIAGNOSTIC MESSAGE IS SHOWING
102 MODEL 3081 pH/ORP SECTION 12.0 TROUBLESHOOTING SYMPTOM SECTION Id 000 appears in display when trying to program or calibrate transmitter 12.5.1 Error message flashing in display 12.4 Transmitter does not respond to remote controller 12.5.2 Calibration Problems: SLOPE Err HI or SLOPE Err LO appea...
Page 118 - pH Reading in Buffer Drifts During Manual Calibration
104 MODEL 3081 pH/ORP SECTION 12.0 TROUBLESHOOTING 12.5.5 pH Reading in Buffer Drifts During Manual Calibration A. Allow adequate time for the temperature of the sensor to reach the temperature of the buffer. If the sensor was in a process substantially hotter or colder than the buffer, allow at lea...
Page 119 - D. Check for extra ground connections or induced noise.
105 MODEL 3081 pH/ORP SECTION 12.0 TROUBLESHOOTING 12.5.8 Buffer Calibration Is Acceptable; Process pH is Grossly Different from Expected Value. The symptoms suggest a ground loop (measurement system connected to earth ground at more than one point), a float-ing system (no earth ground), or noise be...
Page 120 - B. Be sure the HART load and voltage requirements are met.
106 MODEL 3081 pH/ORP SECTION 12.0 TROUBLESHOOTING 4. Occasionally, noise can travel into the transmitter housing from the metal it is mounted on. The noise is then radiated into the transmitter electronics. If isolating the transmitter from its metal mounting eliminates the symptoms, move the trans...
Page 121 - 4 Transmitter Periodically Restarts Itself; B. If RTD wiring is correct and problems still persist.; SYSTEMATIC TROUBLESHOOTING
107 MODEL 3081 pH/ORP SECTION 12.0 TROUBLESHOOTING 12. 5.13 Transmitter Locks Up A. Turn the dc power off, then turn it back on. B. If the problem persists, replace the electronic board stack (PN 23574-02). 12. 5.14 Transmitter Periodically Restarts Itself A. The problem is usually related to improp...
Page 122 - or Remote Junction Box
108 MODEL 3081 pH/ORP SECTION 12.0 TROUBLESHOOTING Process pH measurement problem Perform buffer calibration (outside of the process) Refer to Section 7.5 Buffer calibration OK? Preamplifier and trans- mitter test OK? Put transmitter preamplifier switch (S-1) into junction box position. Likely Proce...
Page 124 - DISPLAYING DIAGNOSTIC VARIABLES
MODEL 3081 pH/ORP SECTION 12.0 TROUBLESHOOTING 12.7 DISPLAYING DIAGNOSTIC VARIABLES 12.7.1 Purpose This section describes how to display the diagnostic variables listed below: DIAGNOSTIC MEASUREMENTS DIAGNOSTIC MESSAGES 1. Sensor voltage in mV ( InPut ) 1. Software version ( VEr ) 2. Glass impedance...
Page 125 - is working, it should accept the calibration.
111 MODEL 3081 pH/ORP SECTION 12.0 TROUBLESHOOTING 1 2 . 8 . 2 p H S i m u l a t i o n W h e n t h e P r e a m p l i f i e r I s L o c a t e d i n t h eTransmitter. 1. Verify that switch S-1 is set to "transmitter". See Section 2.2. 2. Turn off sensor diagnostics. See Section 8.4. 3. Turn of...
Page 126 - FIGURE 12-9. Simulate pH through Model 381+ Sensor Preamplifier; Refer to Figure 12-9 for connections to the sensor.; InPut
112 MODEL 3081 pH/ORP SECTION 12.0 TROUBLESHOOTING FIGURE 12-9. Simulate pH through Model 381+ Sensor Preamplifier DWG. NO. REV. 40381+05 A 12.8.4 pH Simulation with the Model 381+ Sensor 1. Verify that switch S-1 is set to "sensor or junction box". See Section 2.2. 2. Turn off sensor diagno...
Page 127 - THE WIRE TOUCH THE OUTSIDE OF THE BNC CONNECTOR.; pH Simulation When Preamplifier is in Sensor; FACTORY ASSISTANCE AND REPAIRS
113 MODEL 3081 pH/ORP SECTION 12.0 TROUBLESHOOTING 10. Touch the other end of the second jumper to the center pin of the BNC connector on the preamplifier. DO NOT LET THE WIRE TOUCH THE OUTSIDE OF THE BNC CONNECTOR. 11. Measure the voltage. The measured voltage should be 0 mV, and the pH should be a...
Page 129 - MEASURING ELECTRODE; m) into the glass, the hydrated layer must be present; REFERENCE ELECTRODE
115 MODEL 3081 pH/ORP SECTION 13.0 pH MEASUREMENTS designed, the liquid junction potential is usually small and rel-atively constant. All three potentials depend on temperature.As discussed in Sections 13.5 and 13.6, the factor relatingthe cell voltage to pH is also a function of temperature. The co...
Page 130 - LIQUID JUNCTION POTENTIAL; the potential of the external reference electrode
116 MODEL 3081 pH/ORP SECTION 13.0 pH MEASUREMENTS FIGURE 13-5. The Origin of Liquid Junction Potentials. The figure shows a thin section through a pore in the junction plug. The junction separates a solution of potassium chloride onthe left from a solution of hydrochloric acid on the right. The sol...
Page 131 - the liquid junction potential.; GLASS ELECTRODE SLOPE
117 MODEL 3081 pH/ORP SECTION 13.0 pH MEASUREMENTS 4. the liquid junction potential. The second term, 0.1984 T pH, is the potential (in mV) atthe outside surface of the pH glass. This potential dependson temperature and on the pH of the sample. Assumingtemperature remains constant, any change in cel...
Page 132 - ISOPOTENTIAL pH
118 MODEL 3081 pH/ORP SECTION 13.0 pH MEASUREMENTS pH 7.00 and pH 10.00. When the electrodes are placed inpH 7 buffer the cell voltage is V 7 , and when the electrodes are placed in pH 10 buffer, the cell voltage is V 10 . Note that V 7 is not 0 mV as would be expected in an ideal sensor, but is sli...
Page 133 - and the cell voltage is E; PREAMPLIFIERS; at the electrode and about
119 MODEL 3081 pH/ORP SECTION 13.0 pH MEASUREMENTS junction potentials in the buffers are assumed to be equaland are exaggerated for clarity. If the liquid junction potential in the sample differs from thebuffers, a measurement error results. Figure 13-8 illus-trates how the error comes about. Assum...
Page 134 - ORP MEASUREMENTS
120 MODEL 3081 pH/ORP SECTION 14.0 ORP MEASUREMENTS SECTION 14.0 ORP MEASUREMENTS 14.1 General 14.2 Measuring Electrode 14.3 Reference Electrode 14.4 Liquid Junction Potential 14.5 Relating Cell Voltage to ORP 14.6 ORP, Concentration, and pH 14.7 Interpreting ORP Measurements 14.8 Calibration 14.1 G...
Page 136 - RELATING CELL VOLTAGE TO ORP; Fe
122 Liquid junction potentials exist whenever dissimilar elec-trolyte solutions come into contact. The magnitude of thepotential depends on the difference between the mobility ofthe ions. Although liquid junction potentials cannot be elim-inated, they can be made small and relatively constant. Asmal...
Page 137 - INTERPRETING ORP MEASUREMENTS; Cr; FIGURE 14-6. ORP Measurement Interpretation; log; Sulfur dioxide added
123 is described by the following equation, called theNernst equation: E = E° - (2) In the Nernst equation, E is the electrode potential andE° is the standard electrode potential, both in millivolts,t is temperature in °C, n is the number of electronstransferred (n = 1 in the present case), and [Fe ...
Page 140 - THEORY - REMOTE COMMUNICATIONS; Overview of HART Communications
126 15.1 OVERVIEW OF HART COMMUNICATION HART (highway addressable remote transducer) is a digital communication system in which two frequencies aresuperimposed on the 4 to 20 mA output signal from the transmitter. A 1200 Hz sine wave represents the digit 1,and a 2400 Hz sine wave represents the digi...
Page 141 - ASSET MANAGEMENT SOLUTIONS; Fieldbus, which allows future upgrades to Fieldbus instruments.
127 MODEL 3081 pH/ORP SECTION 15.0 THEORY - REMOTE COMMUNICATIONS If your communicator does not recognize the Model 3081 pH/ORP transmitter, the device description library may needupdating. Call the manufacturer of your HART communication device for updates. 15.3 ASSET MANAGEMENT SOLUTIONS Asset Man...
Page 142 - GLOSSARY
128 TERM DEFINITION Acid When dissolved in water acids increase the hydrogen ion concentration. Purewater at 25°C contains 1 x 10 -7 moles per liter of hydrogen ions (H + ) and an equal concentration of hydroxide ions (OH-). An acid increases the hydrogen ion con-centration above the value found in ...
Page 148 - RETURN OF MATERIAL; Call Rosemount Analytical for authorization.
134 MODEL 3081 pH/ORP SECTION 17.0 RETURN OF MATERIAL SECTION 17.0 RETURN OF MATERIAL 17.1 GENERAL. To expedite the repair and return of instruments, propercommunication between the customer and the factoryi s i m p o r t a n t . C a l l 1 - 9 4 9 - 7 5 7 - 8 5 0 0 f o r a R e t u r nMaterials Autho...
Page 149 - The shipping container should be marked:
WARRANTY Goods and part(s) (excluding consumables) manufactured by Seller are warranted to be free from defects in workman- ship and material under normal use and service for a period of twelve (12) months from the date of shipment by Seller.Consumables, pH electrodes, membranes, liquid junctions, e...