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Summary of Contents for Omega Engineering HH-21
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Page 3: Table Of Contents
TABLE OF CONTENTS General Information ........Specifications . -
Page 4: General Information
GENERAL INFORMATION This manual provides information on the use of three digital handheld ther- mometers. Functional features both common and unique to each model are described. All three models are microprocessor based, and provide accurate and reliable operation. They function with the most popular thermocouples; types K, J, and T. - Page 5 MAXIMUM COMMON MODE VOLTAGE: 42V peak to earth. POWER: 9 volt transistor battery (NEDA 1604). BATTERY LIFE, CONTINUOUS: 50 hrs typical, carbon-zinc; 100 hrs typical, alkaline; 200 hrs typical, lithium; 15 hrs typical, Ni-Cd (rechargeable). BATTERY INDICATOR: Display indicates BAT when less than 10% of life remains. DISPLAY: 5 digit LCD, 0.4"...
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Page 6: Difference Specifications
DIFFERENCE SPECIFICATIONS MODEL HH-21: THERMOCOUPLE INPUTS: 1 DISPLAY: 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;... -
Page 7: Features
• Temperature trend indication (rising, falling, or stable) • Full range resolution of 0.1 degree • Work with thermocouple types K, J and T • Kpad selectable °F or °C • Two probe inputs (for two point temperature measurements) • Calculates and displays temperature difference between the two probe inputs •... -
Page 8: Safety Information
SAFETY INFORMATION SAFETY SYMBOLS AND TERMS The symbol on the instrument denotes that the user should refer to the The WARNING used in this manual explains dangers that could result in The CAUTION used in this manual explains hazards that could damage SAFETY PRECAUTIONS These instruments are intended for use by qualified per- sonnel trained in the safe operation of electronic testing... - Page 9 Bending lead wires at a sharp angle can damage the wire causing probe failure. When using both thermometer inputs, and a voltage differ- ential exists between the two measurement points, at least one probe should be electrically insulated. If not, ground- loop current can flow through the thermocouple leads causing measurement error or instrument damage.
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Page 10: Battery Installation/Replacement
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. Turn the unit off and disconnect any input connections before replacing the battery. Put the cover back into place on the battery compartment before resuming use of the instrument. -
Page 12: Memory Backup
The following instructions make reference to keypad inputs, and display readouts. Refer to Figure 2 to locate key switches, and identify display dif- ferences between thermometer models. Model HH-22 is similar in layout to the HH-23, except operation is limited to K and J thermocouples. -
Page 13: Display Annunciators
2. DISPLAY ANNUNCIATORS Each item on the display (Figure 2) is described below in detail. To better familiarize yourself with the thermometer’s display annunciators, please read this section. T1 T2 T1-T2 This annunciator will indicate which input is being monitored. - Page 14 Record Annunciator A flashing record symbol adjacent to a corresponding input selection annunciator indicates that this channel is being recorded. A static record symbol indicates data has been recorded, but is not being updated. Trend Indication Annunciators When the up-arrow is displayed, the reading is increasing. When the down-arrow is displayed, the reading is decreasing.
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Page 15: Function Keys
T1, T2 and T1-T2. 3. FUNCTION KEYS The ON/OFF key turns the thermometer on or off. To turn the ther- mometer on, press the ON/OFF Key once. All the display annun- ciators and segments should turn on momentarily (see Figure 2) for visual checking. - Page 16 The THERMOCOUPLE TYPE SELECTION key selects which type of thermocouple the thermometer will be set up to use (Type K, J or T). Upon initial power-up, the thermometer will be ready to accept a K Type thermocouple. To change the thermometer to...
- Page 17 NOTE: The thermometer will display “OPEN” on When using both thermocouple inputs, and a voltage differential exists between the two mea- surement points, at least one probe should be electrically insulated. NOTES: • T1 and T2 are not measured simultaneously.
- Page 18 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, VIEW first select T1, T2, or T1-T2. Then press the VIEW key to read the MAX temperature. A second press of the VIEW key will display the MIN temperature.
- Page 19 If the STOP/CLR key is pressed again (after stopping data recording), MIN/MAX data for the corresponding measurement mode is cleared, and the REC annunciator is turned off. NOTES: • MIN/MAX data is erased when the thermometer is turned off. • Record configurations are not saved during power-off.
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Page 20: Service Information
SERVICE INFORMATION All service information is intended for qualified electronic maintenance 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 test (U.U.T.): Type K Type J Type T Ambient Conditions:... -
Page 21: Disassembly Instructions
U.U.T. should read 1400.0°F ±1.0°F, type J. NOTE: On Model HH-22, go to step 21 to complete calibration. On Models HH-21 and HH-23, continue calibration at step 15. Replace type J cable with Type T. 16. Set calibrator output to 32°F, type T. - Page 22 Re-assemble the instrument by following the reverse of the above procedure. Do not use excessive torque when re-installing the nylon machine-screw into the rear case. Excess torque will dam- age the part. Do not substitute a metal part for the nylon machine- screw.
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Page 24: Component Layout
4. COMPONENT LAYOUT... -
Page 25: Parts List
Schematic Designation* C1, 2, 17 C3, 9, 10 C4, 8, 11, 13, 14 C5, 6, 7 C15, 16 CON1 CON2 CON3 CON4 Q1, 3 R1, 2, 30, 31 R3, 4, 9, 13, 14, 15, 16, R5, 6 R7, 21, 24, 25, 26, 27, 28, 33 R17, 18, 19, 29, 39, 40, 41... - Page 26 Schematic Designation* — — — — * Numbers in parentheses refer to notes below: (1) Deleted from Model HH-21. (2) Matched pair. (3) Full part number by Model: HH-21; LSI-120-819 HH-22; LSI-120-820 HH-23; LSI-120-821 (4) Part number by Model: HH-21; 819-322 HH-22;...
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Page 27: Schematic Diagrams
6. SCHEMATIC DIAGRAMS 1. Signal Conditioning and A/D... - Page 28 2. Microcomputer and Display...
- Page 29 3. Power Supply...
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