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Model 421508
Dual Input, 3-Display Handheld Thermometer
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Accepts J, K, T, E, R, S, & N thermocouples
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Backlit Electro-luminescent LCD Display
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T1 / T2 / T1 – T2 displays
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MIN / MAX / AVG Record/Recall
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Selectable temperature units (C/F)
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Data Hold, Relative Mode, Elapsed Timer
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Bi-directional RS-232 PC Interface
Introduction
Congratulations on your purchase of Extech's Dual Input, 3-Display, Hand-Held Digital
Thermometer. This portable digital thermometer is designed to use external K / J / T / E / R
/ S / N type thermocouples (K-type supplied). Temperature indication follows Reference
Temperature/Voltage Tables (N.I.S.T. Monograph 175 Revised to ITS-90). This
professional meter, with proper care, will provide years of safe reliable service.
Page 1
INSTRUCTION MANUAL
Model 421508 Version 1.0 October 2002
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Table of Contents
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Summary of Contents for Extech Instruments 421508
- Page 1 / S / N type thermocouples (K-type supplied). Temperature indication follows Reference Temperature/Voltage Tables (N.I.S.T. Monograph 175 Revised to ITS-90). This professional meter, with proper care, will provide years of safe reliable service. Page 1 Model 421508 Version 1.0 October 2002...
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Page 2: Specifications
4', type K (with teflon insulation) Max insulation temp: 500 F (260 Thermocouples Accuracy: ± 4 F (2.2 C) or ± 0.75% of rdg (whichever is greater) from 32 to 1472 F (0 to 800 Page 2 Model 421508 Version 1.0 October 2002... -
Page 3: Safety Information
This symbol on the instrument indicates that the operator must refer to an explanation in this manual. Meter Description Thermocouple inputs Optical PC Interface LCD Display Keypad Rubber meter holster Battery compartment and tilt stand on rear Page 3 Model 421508 Version 1.0 October 2002... -
Page 4: Meter Operation
HOLD key to pause recording (all values are then held). Press HOLD again to resume recording. To exit the MIN MAX mode press and hold the MIN MAX key until the RECORD icon switches off. Page 4 Model 421508 Version 1.0 October 2002... - Page 5 The backlight button (bottom right) doubles as the numeric ‘9’ key. Press the backlight button to toggle the backlighting on and off. The backlight will switch-off automatically after 60 seconds to conserve battery life. Page 5 Model 421508 Version 1.0 October 2002...
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Page 6: Battery Replacement
Warranty EXTECH INSTRUMENTS CORPORATION warrants this instrument to be free of defects in parts and workmanship for one year from date of shipment (a six month limited warranty applies on sensors and cables). If it should become necessary to return the instrument for service during or beyond the warranty period, contact the Customer Service Department at (781) 890-7440 ext.
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