Omega HH-21 - Manuals - manualsarea.com

Page 3 - TABLE OF CONTENTS

1 TABLE OF CONTENTS General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Difference Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . ....

Page 6 - DIFFERENCE SPECIFICATIONS; MODEL

4 DIFFERENCE SPECIFICATIONS MODEL HH-21 : THERMOCOUPLE INPUTS: 1DISPLAY: 5 digit LCD, 0.4" height. Polarity indication, and decimal point. Annunciators• Readout Scale: °F, °C• TC Type: K, J, T• Hold (when activated) KEYPAD: 5 momentary switches with tactile feedback select;• Power ON/OFF• TC typ...

Page 8 - SAFETY INFORMATION; SAFETY SYMBOLS AND TERMS; The symbol; SAFETY PRECAUTIONS; WARNING

6 SAFETY INFORMATION SAFETY SYMBOLS AND TERMS The symbol on the instrument denotes that the user should refer to the operating instructions. The WARNING used in this manual explains dangers that could result in personal injury or death. The CAUTION used in this manual explains hazards that could dam...

Page 10 - BATTERY INSTALLATION/REPLACEMENT; Remove the old battery.; Figure 1. Battery Installation

8 BATTERY INSTALLATION/REPLACEMENT A 9V battery is supplied with the instrument but not installed. Read the fol-lowing installation instructions before attempting to install or remove the bat-tery. WARNING Turn the unit off and disconnect any input connectionsbefore replacing the battery. Put the co...

Page 12 - is similar in layout to the

10 MEMORY BACKUP During battery replacement, the contents of user-programmed memory(data, operating modes, etc.) can be saved. Prior to removing the old battery,turn off the instrument, and connect a Model 80010 battery charger. Thenexchange batteries, and disconnect the battery charger. Do not leav...

Page 13 - DISPLAY ANNUNCIATORS; Input Selection Annunciator

11 Display reads (1) No thermocouple or a damaged ther- mocouple is plugged into the selectedinput.NOTE: When viewing T1-T2, there must be a thermocouple plug-ged into both input jacks. Display reads momentarily. (1) This indicates that an invalid entry has been made. Review keystroke se-quence, or ...

Page 15 - Hold Annunciator; This symbol will indicate that the instrument display is on hold.; Scan Annunciator; ON

13 10. HOLD Hold Annunciator This symbol will indicate that the instrument display is on hold. 11. SCAN Scan Annunciator This annunciator will be displayed when the instrument is sequentiallyviewing T1, T2 and T1-T2. 3. FUNCTION KEYS The ON/OFF key turns the thermometer on or off. To turn the ther-m...

Page 16 - • To insure proper temperature readings, be sure; HOLD; K J; SENSOR

14 The DISPLAY RESOLUTION key selects whether the tempera-ture readings will be displayed in high resolution (0.1°C or °F) orlow resolution (1°C or °F). At initial power-up, the thermometer willread in high resolution. NOTE:• Key selection is retained during power off. The THERMOCOUPLE TYPE SELECTIO...

Page 17 - NOTE: The thermometer will display “OPEN” on; CAUTION; • Key selection is retained during power off.; NOTE: REC cannot be started while the readout is; REC

15 NOTE: The thermometer will display “OPEN” on any selected channel that does not have athermocouple plugged in or if the thermo-couple is open-circuited. CAUTION When using both thermocouple inputs, and avoltage differential exists between the two mea-surement points, at least one probe should bee...

Page 18 - VIEW

16 With the thermometer in either the T1, T2, or T1-T2 mode, corre-sponding MIN/MAX data can be viewed. To view MIN/MAX data,first select T1, T2, or T1-T2. Then press the VIEW key to read theMAX temperature. A second press of the VIEW key will displaythe MIN temperature. At the third press of the VI...

Page 19 - STOP

17 Recording in one or more of the three measurement modes T1,T2, and T1-T2 can be stopped with this key. Before pressing CLRthis key, select the appropriate mode. When MIN/MAX data col-lection is stopped, the corresponding REC annunciator will stopflashing, but will remain on (to indicate that MIN/...

Page 20 - SERVICE INFORMATION; CALIBRATION PROCEDURE; Test Equipment Required:; cable. Use input T1 on Models

18 SERVICE INFORMATION WARNING All service information is intended for qualified electronicmaintenance personnel only. 1. CALIBRATION PROCEDURE Test Equipment Required: 1. Thermocouple calibrator ( Omega CL521 , or equivalent). 2. Calibration cable for each thermocouple type handled by unit under te...

Page 21 - DISASSEMBLY INSTRUCTIONS; NOTE: Be sure to keep the case face down during this last

19 12. Wait for U.U.T. readout to stabilize, then press HOLD key once, and wait a few seconds. U.U.T. should read 32.0°F ±0.5°F, type J. 13. Set calibrator output to 1400°F, type J. 14. Wait for U.U.T. readout to stabilize, then press HOLD key once, and wait a few seconds. U.U.T. should read 1400.0°...

Page 27 - SCHEMATIC DIAGRAMS

25 6. SCHEMATIC DIAGRAMS 1. Signal Conditioning and A/D