Tegam 819A, 820A, 821A Instruction Manual

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.

Document Number

lication Date:

Pub

October 2004

819A-901-01 Re

:

.O

v

WARRANTY

Tegam, Inc. warrants this product to be free from defects in material and
workmanship for a period of three years from date of shipment. During the
warranty period, we will at our option, either repair or replace any product that
proves to be defective.

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.

To exercise this warranty, contact Tegam, Inc., Ten Tegam Way, Geneva,
Ohio 44041/FAX [phone], M-F, 8 a.m.-5 p.m. ET. You
will be given prompt assistance and return instructions. Send the instrument,
transportation prepaid, to the indicated service facility. Repairs will be made
and the instrument returned, transportation prepaid. Repaired products are
warranted for the balance of the original warranty, or at least 90 days,
whichever is longer.

LIMITATION OF WARRANTY

Tegam, Inc. warranty does not apply to defects resulting from unauthorized
modification or misuse of any product or part. This warranty also does not
apply to fuses, batteries, or damage from battery leakage.

This warranty is in lieu of all other warranties, expressed or implied, includ-
ing any implied warranty of merchantability or fitness for a particular use.
Tegam, Inc. shall not be liable for any indirect, special or consequential
damages.

STATEMENT OF CALIBRATION

This instrument has been inspected and tested in accordance with specifica-
tions published by Tegam, Inc.

The accuracy and calibration of this instrument are traceable to the National
Institute of Standards and Technology through equipment which is calibrated
at planned intervals by comparison to certified standards maintained in the
Laboratories of Tegam, Inc.

1

TABLE OF CONTENTS

General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Difference Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Manual Addenda. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Unpacking and Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Safety Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Battery Installation/Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Memory Backup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Operation with Rechargeable Battery. . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Operating Instructions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

1. Diagnostics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

2. Display Annunciators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

3. Function Keys. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Service Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

1. Calibration Procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

2. Disassembly Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

3. Mechanical Parts Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Back Cover

Limitation of Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Back Cover

Statement of Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Back Cover

2

GENERAL INFORMATION

This manual provides information on the use of three digital handheld ther­mometers. 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. A variety of features in these projects enhance their versatility, while
simplifying operation.

It is recommended that you read this manual thoroughly, especially the
sections on safety, prior to operating these instruments.

SPECIFICATIONS

THERMOCOUPLE INPUTS: 2 (T1, T2) miniature TC connectors.

Accepts male miniature and subminiature TC connectors.

THERMOCOUPLE TYPES: K, J, T

READOUT: T1, T2, T1-T2, and SCAN (T1, T2, T1-T2).

ACCURACY: (18°C to 28°C ambient, 2 years, excludes thermocouple error).

REPEATABILITY: ±0.2°C typical for 1 week at constant ambient temperature.

TEMPERATURE COEFFICIENT: 18°C to 28°C; included in accuracy specification.

From 0°C to 18°C, and 28°C to 50°C; less than ±(0.02% rdg + 0.1°C)/°C.

ENVIRONMENTAL LIMITS FOR OPERATING: 0°C to 50°C, less than 80% relative
humidity (R.H.) up to 35°C; reduce R.H. limit by 3%/°C from 35°C to 50°C.

ENVIRONMENTAL LIMITS FOR STORAGE: –35°C to 60°C, less than 90% relative
humidity (R.H.) up to 35°C; reduce R.H. limit by 3%/°C from 35°C to 60°C.

INPUT CURRENT: 50 nA typical.

READING RATE: (T1, T2, T1-T2); 1 reading/second typical, all parameters.

TC Extended Temp.

Type Range Resolution Accuracy (T1, T2) Accuracy (T1-T2) Range Acc’y (T1,T2), Typ.

K 0°C to 1372°C 0.1/1°C ±(0.1% rdg + 0.6°C) Acc’y (T1) + Acc’y (T2) –200°C to –250°C, ±(3°C)

32°F to 2502°F 0.1/1°F ±(0.1% rdg + 1.0°F) Acc’y (T1) + Acc’y (T2) –328°F to –418°F, ±(5°F)

–200°C to 0°C 0.1/1°C ±(0.3% rdg + 0.6°C) Acc’y (T1) + Acc’y (T2)

–328

°F to 32°F 0.1/1°F ±(0.3% rdg + 1.0°F) Acc’y (T1) + Acc’y (T2)

J

0

°

C to 760

°C 0.1/1°C ±(0.1% rdg + 0.6°C) Acc’y (T1) + Acc’y (T2) —

32

°

F to 1400

°

F

0.1/1°F ±(0.1% rdg + 1.0°F) Acc’y (T1) + Acc’y (T2) —

–210°C to 0°C 0.1/1°C ±(0.3% rdg + 0.6°C) Acc’y (T1) + Acc’y (T2) —

–346

°

F to 32

°

F

0.1/1

°

F ±(0.3% rdg + 1.0°F) Acc’y (T1) + Acc’y (T2) —

T 0°C to 400°C 0.1/1°C ±(0.1% rdg + 0.6°C) Acc’y (T1) + Acc’y (T2) –200°C to –250°C, ±(3°C)

32°F to 752°F 0.1/1°F ±(0.1% rdg + 1.0°F) Acc’y (T1) + Acc’y (T2) –328°F to –418°F, ±(5°F)

–200°C to 0°C 0.1/1°C ±(0.3% rdg + 0.6°C) Acc’y (T1) + Acc’y (T2)

–328°F to 32°F 0.1/1°F ±(0.3% rdg + 1.0°F) Acc’y (T1) + Acc’y (T2)

3

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" height. Polarity indication, and decimal point.

Annunciators

• Readout Parameter: T1, T2, T1-T2, SCAN

• Record Parameter: MIN or MAX (when viewing recorded data).

• Readout Scale: °F, °C

• TC Type: K, J, T

• Hold (when activated)

• Reading Trend: up-arrow for increasing readings, down-arrow for decreasing
readings. Both arrows on for stable reading.

• Record MIN/MAX readings for T1, T2, and/or T1-T2; Flashing annunciator indi­cates data being collected. Steady annunciator indicates data available, but not
being up-dated.

KEYPAD: 9 momentary switches with tactile feedback select;

• Power ON/OFF

• Readout: T1, T2, T1-T2, or SCAN

• TC type: K, J, T

• Readout scale: °F/°C

• Resolution: 0.1°/1°

• Display Hold

• Record MIN/MAX

• View MIN/MAX

• Stop recording MIN/MAX (first keystroke), clear recorded MIN/MAX (second
keystroke)

POWER OFF CONFIGURATION RETENTION: Instrument retains last selected;

• Readout: T1, T2, T1-T2, SCAN

• TC type: K, J, T

• Resolution: 0.1°/1°

• Scale: °F/°C

DIAGNOSTICS: Display codes indicate the following conditions:

• Low Battery: ‘BAT’

• Open Thermocouple(s): ‘OPEN’

• Invalid Keypad Entry: Momentary ‘E-1’

• Temperature Reading exceeds TC Rating: ‘E-2’

• Internal Hardware Fault: ‘E-3’ (consult factory)

• LCD Test: During power-up, all segments/annunciators turned on momentarily.

ELECTROMAGNETIC COMPATIBILITY: Add ±0.5% of range to accuracy specific­tions for RF fields up to 1 volt/meter. Accuracy not specified for fields greater than 1
volt/meter.

DIMENSIONS, WEIGHT: 7.0" x 2.9" x 1.1". Net weight 10 oz.

4

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;

• Power ON/OFF

• TC type: K, J, T

• Readout scale: °F/°C

• Resolution: 0.1°/1°

• Display Hold

POWER OFF CONFIGURATION RETENTION: Instrument retains last
selected;

• TC type: K, J, T

• Resolution: 0.1°/1°

• Scale: °F/°C

MODEL 820A:

THERMOCOUPLE TYPES:

K, J

5

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)

• Calculates and displays temperature difference between the two probe
inputs

• Maximum and minimum temperature storage

• Dust proof, splash proof, drop proof construction

• Built-in tilt stand/hanger for bench use or hands free field measurements

• User friendly function programming

• Performs self diagnostic test and displays error readout

• Retains function settings, even when turned off

• Low battery and open sensor indication

• Input data scan and display hold modes

MANUAL ADDENDA

Improvements or changes to this manual will be explained on an addendum
included with the instrument. All change information should be incorporated
immediately into the appropriate places in the manual.

UNPACKING AND INSPECTION

Each instrument is inspected both mechanically and electrically before ship­ment. Upon receiving your instrument unpack all items from the shipping
container and check for any obvious damage that may have occurred during
transit. Report any damage to the shipping agent. Retain and use the origi­nal packing materials if reshipment is necessary.

The following items are included with every shipment.

1. Digital Thermometer

2. Instruction Manual

3. Model 8712 Thermocouple Sensor(s)

4. Part No. 820-309 Wrist Strap

5. 9V Battery (NEDA 1604)

6. Optional accessories as requested.

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 damage

the instrument.

SAFETY PRECAUTIONS

WARNING

These instruments are intended for use by qualified per­sonnel trained in the safe operation of electronic testing
equipment. Read the instruction manual thoroughly before
using, to become familiar with the instrument’s operations
and capabilities.

WARNING

Do not touch a temperature probe sheath when measuring
excessively high or low temperatures, or toxic substances.

WARNING

Do not attempt to measure temperatures beyond the range
of the probe being used. Probe damage or personal injury
could result from exceeding a probe’s maximum tempera­ture rating.

WARNING

The American National Safety Institute (ANSI) states that a
shock hazard exists when probes or sensors are exposed
to voltage levels greater than 42VDC or 42V peak AC. Do
not use this instrument where voltages at the measure­ment surface exceed these levels.

▲▲

!

7

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, discon­nect all temperature probes and sensors and turn the unit
off before removing the cover.

WARNING

Never use this instrument or any probe or sensor inside a
microwave oven.

CAUTION

Avoid making sharp bends in probe or sensor lead wires.
Bending lead wires at a sharp angle can damage the wire
causing probe failure.

CAUTION

When using both thermometer inputs, and a voltage differ­ential exists between the two measurement points, at least
one probe should be electrically insulated. If not, ground­loop current can flow through the thermocouple leads
causing measurement error or instrument damage.