Tegam WG311 v3, 868, 869 Reference Manual
Digital Thermometers
Instruction Manual
Models 868 and 869
Publication Date: January 2005
Document Number: 869-901-01CD Rev. E
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.
TABLE OF CONTENTS
Specifications.......................................................................................1
General Information.............................................................................3
Manual Addenda..................................................................................3
Optional Accessories............................................................................3
Preparation for Use..............................................................................4
Battery Installation/Replacement..........................................................5
Operation..............................................................................................6
Safety Symbols and Terms...................................................................9
Verification Procedure.........................................................................10
Calibration...........................................................................................12
Warranty Information ..........................................................................15
Limitation of Warrantly.........................................................................15
Statement of Calibration......................................................................15
Copyright 2003 TEGAM, Inc. All rights reserved.
SPECIFICATIONS
MODEL 868 SPECIFICATIONS
TEMPERATURE SENSOR TYPE: 3 wire or 4 wire 100 Ohm Platinum RTD
(alpha = 0.00385).
4 WIRE
TEMPERATURE ACCURACY*
RANGE SPAN RESOLUTION (65° to 82°F; 1 Year)
200°F -100.0° to 199.9° 0.1° ±0.4°F
-199.9° to -100.1° 0.1° ±1.0°F
1100°F -100° to 1100° 1° ±2°F
-360° to -101° 1° ±4°F
*ACCURACY: Includes DIN 43 760 (ITS-90) conformity, repeatabilitiy, temperature
coefficient (65° to 82°F), time stability (1 year) and errors with up to 50 ohms
of lead resistance (each lead). Excludes probe errors; however probe errors
around 32°F may be compensated by an internal adjustment.
REPEATABILITY: 0.2°F typical for 1 week at constant ambient temperature.
TEMPERATURE COEFFICIENT: 65° to 82°F; included in accuracy specification.
From 14° to 65° and 82° to 122°F: less than ±0.015°F/°F.
MAXIMUM LEAD RESISTANCE (each lead): 4 Wire; 50 ohms
3 Wire; 10 ohms
SENSOR CURRENT:500µA maximum.
MODEL 869 SPECIFICATIONS
TEMPERATURE SENSOR TYPE: 3 wire or 4 wire 100 Ohm Platinum RTD
(alpha = 0.00385).
4 WIRE
TEMPERATURE ACCURACY*
RANGE SPAN RESOLUTION (18°to 28°C;1 Year)
200°C -100.0° to 199.9° 0.1° ±0.3°C
-199.9° to -100.1° 0.1° ±1.5°C
630°C -100° to 630° 1° ±1°C
-220° to -101° 1° ±2°C
*ACCURACY: Includes DIN 43 760 (ITS-90) conformity, repeatabilitiy, temperature
coefficient (18° to 28°C), time stability (1 year) and errors with up to 50 ohms
of lead resistance (each lead). Excludes probe errors; however probe errors
around 0°C may be compensated by an internal adjustment.
REPEATABILITY: 0.1°C typical for 1 week at constant ambient temperature.
TEMPERATURE COEFFICIENT: 18° to 28°C; included in accuracy specification.
From -10° to 18° and 28° to 50°C: less than ±0.015°C/°C.
MAXIMUM LEAD RESISTANCE (each lead): 4 Wire: 50 ohms
3 Wire; 10 ohms
SENSOR CURRENT: 500µA maximum.
MODEL 868 and 869 GENERAL SPECIFICATIONS (unless specified):
DISPLAY: 3 1/2-digit LCD, 13mm (0.5") height. Polarity and decimal point indication.
CONVERSION RATE: 1.5 readings per second.
OVERRANGE AND OPEN SENSOR INDICATION: 3 least significant digits blanked.
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MAXIMUM COMMON MODE VOLTAGE: 30VDC (42V peak AC).
COMMON MODE REJECTION: Less than 0.001°/ volt at DC, 50 Hz and 60 Hz. (100Ω
unblance, LO driven)
ENVIRONMENTAL LIMITS FOR OPERATING: -10° to 50°C (14° to 122°F), less than
80% relative humidity up to 35°C (95°F). Reduce R.H. Limit by 3% from 35° to 50°C
(1.7% R.H./°F from 95° to 122°F).
ENVIRONMENTAL LIMITS FOR STORAGE: -35° to 60°C (-30° to 140°F), less than
90% relative humidity up to 35°C (95°F); Reduce R.H. Limit by 3%/°C from 35° to
60°C (1.7% R.H./°F from 95° to 140°F).
INPUT CONNECTION: 4 pin miniature instrumentation connector.
POWER: 9V alkaline or carbon-zinc battery.
BATTERY LIFE, CONTINUOUS: 500 hours typical with alkaline battery; 300 hours
typical with carbon-zinc battery.
BATTERY INDICATOR: Display indicates "LO BAT' when less than 10% of life remains.
DIMENSIONS, WEIGHT: 160mm long x 69mm wide x 31mm thick (6.3" x 2.7" x 1.2").
Net weight 210gm (7.5 oz.)
CONSTRUCTION: Heavy duty ABS plastic housing.
ACCESSORIES SUPPLIED: Battery, instruction manual and mating input connector.
Specifications subject to change without notice.
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GENERAL INFORMATION
The TEGAM Models 868 and 869 are handheld digital thermometers designed to use
100Ω platinum RTD temperature sensors for high accuracy and long term temperature
stability. The Model 868 has two switch-selectable ranges: from -199.9°F to + 199.9°F
with 0.1°F resolution, and between -360°F and +1100° with 1°F resolution. The Model
869 measures between -199.9°C and + 199.9°C with 0.1°C resolution, or between
-220°C and +630°C with 1°C resolution, or between -220°C and +630°C with 1°C resolution. Both instruments are designed for use with probes conforming to the DIN 43 760
standard.
Model 868 and 869 features include:
1. Platinum RTD Based Temperature Measurements. A chief advantage of the platinum
RTD (resistance temperature detector) sensor used by the unit is platinum's predictable resistance change with temperature, resulting in high accuracy.
2. Easily selected 3- or 4-Wire Measurements. The unit may be used with either 3-wire
or 4-wire temperature probes. An internal switch provides a means of easy 3- or 4wire selection (the unit is set for 4-wire operation at the factory).
3. Rugged Case. The instrument's case is made of high impact ABS plastic.
4. Long Battery Life. Because of low power consumption, an alkaline battery will typical-
ly last for 500 hours of continous operation.
MANUAL ADDENDA
Information presented in this manual was believed to be accurate at the time of printing.
Any changes in the instrument, which occur after this manual is printed, will be covered
separately in an addendum packed with the instrument. Be sure to note these changes
before attempting to operate or service the instrument.
OPTIONAL ACCESSORIES
Available accessories, including recommended temperature probes, are listed below.
Contact any TEGAM Distributor or the factory for information on purchasing accessories.
Model 8660 Tilt Stand/Belt Clip provides a convenient method of elevating the instrument to a convenient viewing height. The Model 8660 also includes a belt clip.
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Model 8668 Soft Carrying Case provides protection for the Model 868 or 869 during
transportation or storage.
Model 8693 General Purpose Immersion Probe is a 4-wire 100Ω platinum RTD probe
designed for immersion in liquids as well as other general purpose applications. The
Model 8693 has a basic tolerance of ±0.3°C at 0°C. The measurement range of the
Model 8693 is -220°C to +630°C.
Model 8695 Surface Probe is a 4-wire 100Ω platinum RTD probe designed to measure
flat surfaces of solids in the range of -50°C to +260°C. The Model 8695 has a basic tolerance of ±0.3°C at 0°C.
Model 8696 Air/Gas Probe is a 4-wire 10012 platinum RTD probe with an exposed
sensor with an exposed sensor within a protective shroud to measure ambient temperature.The Model 8696 measures between -50°C and +260°C. The basic tolerance of the
Model 8696 is ±0.3°C at 0°C.
PREPARATION FOR USE
Carefully unpack the instrument from its shipping carton and inspect for any obvious
signs of physical damage. Report any damage to the shipping agent at once. The following items are included with every shipment:
1. Digital Thermometer
2. CD of Manual
3. 9V battery
4. 4-wire miniature instrumentation connector (mates with probe connector on the in-
strument).
NOTE:
As shipped, the instrument is configured for 4-wire
probes. See the operation section for selection of 3-wire
operation.
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