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Microprocessor
Digital Thermometer
Instruction Manual
Models 819A, 820A and 821A
This owner's manual was as current as possible when this product was
manufactured. However, products are constantly being updated and
improved. Because of this, some differences may occur between the
description in this manual and the product you received.
Publication Date: October 2004
Document Number: 819A-901-01 Rev. O
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Summary of Contents for Tegam 819A
- Page 1 Microprocessor Digital Thermometer Instruction Manual Models 819A, 820A and 821A This owner’s manual was as current as possible when this product was manufactured. However, products are constantly being updated and improved. Because of this, some differences may occur between the description in this manual and the product you received.
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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 reli- able 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 819A: 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
FEATURES • Temperature trend indication (rising, falling, or stable) • Full range resolution of 0.1 degree • Work with thermocouple types K, J and T • Keypad selectable °F or °C • Two probe inputs (for two point temperature measurements) •... -
Page 8: Safety Information
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 damage the instrument. - Page 9 WARNING Do not substitute a metal part for the nylon screw in the rear case. Doing so will degrade electrical isolation of the case. WARNING The battery is accessible through a cover on the back of the instrument. To avoid electrical shock hazard, discon- nect all temperature probes and sensors and turn the unit off before removing the cover.
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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 following installation instructions before attempting to install or remove the battery. WARNING 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 11 MADE IN THE U.S.A. MADE IN THE U.S.A. Figure 2. Display-Keypad Formats for Models 819A/821A...
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Page 12: 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 819A-910 battery charger in the U.S.A. Then exchange batteries, and disconnect the battery charger. Do not leave the battery charger connected to instruments with non-rechargeable batteries. -
Page 13: Display Annunciators
Display reads (1) No thermocouple or a damaged ther- mocouple is plugged into the selected input. 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. - 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
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 sequentially viewing 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. - Page 16 The DISPLAY RESOLUTION key selects whether the tempera- 0.1° ture readings will be displayed in high resolution (0.1°C or °F) or low resolution (1°C or °F). At initial power-up, the thermometer will 1° read in high resolution. NOTE: • Key selection is retained during power off. The THERMOCOUPLE TYPE SELECTION key selects which type of thermocouple the thermometer will be set up to use (Type K, J or T).
- Page 17 NOTE: The thermometer will display “OPEN” on any selected channel that does not have a thermocouple plugged in or if the thermo- couple is open-circuited. CAUTION When using both thermocouple inputs, and a voltage differential exists between the two mea- surement points, at least one probe should be electrically insulated.
- 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 Recording in one or more of the three measurement modes T1, S S T T O O P P T2, and T1-T2 can be stopped with this key. Before pressing CLR this key, select the appropriate mode. When MIN/MAX data col- C C L L R R lection is stopped, the corresponding REC annunciator will stop flashing, but will remain on (to indicate that MIN/MAX data has...
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Page 20: Service Information
All service information is intended for qualified electronic maintenance personnel only. 1. CALIBRATION PROCEDURE Test Equipment Required: 1. Thermocouple calibrator (Tegam 855, or equivalent). 2. Thermocouple cable for each thermocouple type handled by unit under test (U.U.T.): Type K Type J... -
Page 21: Disassembly Instructions
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. - Page 22 Re-assemble the instrument by following the reverse of the above procedure. CAUTION Do not use excessive torque when re-installing the nylon machine-screw into the rear case. Excess torque will dam- age the part. WARNING Do not substitute a metal part for the nylon machine- screw.
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Page 23: Mechanical Parts Diagram
3. MECHANICAL PARTS DIAGRAM BOTTOM COVER 819A-307 TOP Cover MODEL 819A: 819A-305 820A: 820A-305 821A: 821A-305 OVERLAY (NOT SHOWN) MODEL 819A: 819A-320 820A: 820A-320 821A: 821A-320... - Page 24 NOTES...
- Page 25 NOTES...
- Page 26 NOTES...
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Page 27: Warranty
Tegam, Inc. warrants the calibration of this product for a period of two years from date of shipment. During this period we will recalibrate any product that does not conform to the published accuracy specification. - Page 28 Keithley Instruments, Lucas Weinschel, and Pragmatic Instruments. A complete list can be viewed on our Product Service Directory at www.tegam.com. For more information about TEGAM and our products, please visit our website at www.tegam.com: or contact one of our customer service representatives at sales@tegam.com or 800-666-1010.
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