Emerson 3081 pH/ORP - Manuals
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Manual Emerson 3081 pH/ORP
Summary
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...
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 ...
• 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...
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-...
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)....
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...
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...
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 ....................................................................
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...
iii MODEL 3081 pH/ORP TABLE OF CONTENTS TABLE OF CONTENTS CONT’D 13.0 pH MEASUREMENTS............................................................................................. 114 13.1 General ...........................................................................................................
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 ...
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...
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...
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...
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...
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...
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...
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...
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...
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 ...
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...
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 ...
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, ...
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...
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, ...
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...
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...
28 MODEL 3081 pH/ORP SECTION 3.0 WIRING SENSOR FLOW CHART (continued on p age 29)
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 ...
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...
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 ...
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...
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,...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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)....
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...
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...
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. ...
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...
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...
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...
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...
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...
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...
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...
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/...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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%...
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...
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...
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...
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 ...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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 ...
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...
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...
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 ...
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...
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...
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