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Digital Thermometers
Instruction Manual
Models 868 and 869
This owner's manual was as current as possible when this product was manufac-
tured. 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: 869-901-01CD Rev. E
Publication Date: January 2005
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Table of Contents
Related Manuals for Tegam WG311 v3
Summary of Contents for Tegam WG311 v3
- Page 1 Digital Thermometers Instruction Manual Models 868 and 869 This owner’s manual was as current as possible when this product was manufac- tured. 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 2: Table Of Contents
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............ -
Page 3: Specifications
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°... - Page 4 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°...
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Page 5: General Information
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°... -
Page 6: Preparation For Use
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. -
Page 7: Battery Installation/Replacement
BATTERY INSTALLATION/REPLACEMENT A 9V battery is supplied with the unit. To install or replace the battery, proceed as follows: WARNING Turn off the power and disconnect the temperature probe before removing the back cover to install or replace the battery. Replace the back cover before resuming use of the instrument. -
Page 8: Operation
OPERATION Figure 1 shows the general control layout, including display nomenclature, for your digital thermometer. The following paragraphs contain information on probe connection, 3- and 4-wire selection, range selection, and basic temperature measuring procedures. Probe Input Connector Low Battery Indicator Shows when less than 10% of battery life remains. - Page 9 C. Re-install the rear cover and tighten the retaining screws. REAR VIEW REAR VIEW A. 4 TERMINAL PROBE B. 3 TERMINAL PROBE Figure 2. 100 Ohm Platinum RTD Connections Pin 1 Source + Pin 2 Sense + Pin 3 Source - Pin 4 Sense - NOTE...
- Page 10 3. Place the temperature range switch in the desired position. Use the lower range, when possible, for best resolution and accuracy. Power is automatically turned on when the range is selected. 4. Place the probe tip on or in the material to be measured. WARNING Do not subject the probe to a voltage more than 30V RMS, 42V peak above earth ground, or a shock...
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Page 11: Safety Symbols And Terms
The operating temperature of the instrument itself can affect accuracy. The accuracy fig- ures given above are for an instrument operating in the range of 18°C to 28°C (65°F to 82°F). For operating environments between -10°C and 18°C (14°F and 65°F) and between 28°C and 50°C (82°F and 122°F), a temperature coefficient of less than ±0.015°C/°C (±0.015°F/°F) can be expected. -
Page 12: Verification Procedure
WARNING The information in this section is intended only for qualified service personnel. Before removing the back cover to service the instrument, disconnect the temperature probe. VERIFICATION PROCEDURE Performance verification is performed by connecting known, precise resistors to the instrument in place of a temperature probe and checking to see that the displayed reading falls within a prescribed range. - Page 13 REAR VIEW DECADE RESISTANCE BOX Figure 4. Connections for Performance Verification and Calibration 3. Refer to Table 1, which lists the verification procedure for both in- struments covered by this manual. To verify instrument perfor- mance at each of the points, set the resistance box to the required value;...
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Page 14: Calibration
Table 1. Performance Verification Procedure (Cont.) Model 869 Resistance Allowable Reading Range Value (65°F to 82°F) 9.90 Ω Ω 6 3 0 ° C -222 to -218 60.26 Ω Ω 200°C -100.3 to -99.7 100.00 Ω Ω 200°C -0.3 to +0.3 138.51 Ω... - Page 15 GENERAL INSTRUMENT CALIBRATION 1. Connect the precision decade resistor box to the instrument as shown in Figure 4. 2. Remove the rear cover as described in the battery installation/replacement section of this manual. Note that it is not necessary to remove the PC board to perform calibration.
- Page 16 Probe errors near 0°C (32°F) can be minimized by using the following procedure. 1. Make up an ice water bath by firmly packing a Dewar flask or thermos with pea-size ice cubes made of distilled water and then filling the container with distilled water.
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Page 17: Warranty Information
WARRANTY TEGAM, Inc. warrants this product to be free from defects in material and workmanship for a period of one year from date of shipment. During the war- ranty period, we will at our option, either repair or replace any product that proves to be defective. - Page 18 TEGAM is a manufacturer of electronic test and measurement equipment for metrolo- gy, calibration, and production test. We also provide repair, calibration, and other sup- port services for a wide variety of test and measurement equipment including RF power sensor calibration systems, RF attenuation measurement systems, resistance standards, ratio transformers, arbitrary waveform generators, micro-ohmmeters, LCR meters, handheld temperature calibrators, thermometers, humidity and temperature control devices, and more.