Extech Extech 421502 Manual

99 Washington Street
Melrose, MA 02176
Fax [phone]
TestEquipmentDepot.com

User’s Guide

Model 421502
Dual Input Type J/K
Digital Thermometer

• Dual input T1 / T2 / T1 – T2 displays

• Maximum temperature record mode

• Selectable units

• Data Hold

INTRODUCTION

Congratulations on your purchase of Extech’s Digital Thermometer. This professional meter,
with proper care, will provide years of safe reliable service.

Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176 - FAX [phone] - TestEquipmentDepot.com

SPECIFICATIONS

Display

5 digit LCD multifunction display

Battery Power Supply NEDA 1604, IEC 6F22, or 006P 9VDC battery.
Auto Power off Meter shuts down after approx. 30 mins. of inactivity
Battery life 160 hours typical with carbon zinc battery
Dimensions / Weight 7.5 x 3.6 x 2.1” (192x91x52.5mm); 11.7oz. (365g)
J TC Range -328 to 1922oF (-200 to 1050oC)
K TC Range -328 to 2498oF (-200 to 1370oC)
Resolution 0.1oC or 0.2oF
Temperature units Selectable C or F temperature units
Accuracy

Temperature Coefficient 0.1 times the applicable accuracy specifications per oC from 0oC

Water resistant housing Gasket protected front panel
Input Protection 24VDC or 24VAC rms max. input on any combination of inputs.

Reading rate One reading per second
Input connectors Accepts standard miniature thermocouple connectors
Supplied thermocouple 4', type K, teflon insulation,

Ambient Operating Range
Storage Temperature
Alarm 95dB

±(0.05% rdg + 0.3oC) -50oC to 1370oC
±(0.05% rdg + 0.7oC) -50oC to -200oC
±(0.05% rdg + 0.6oF) -58oF to 2498oF
±(0.05% rdg + 1.4oF) -58oF to -328oF

o

C and 28oC to 50oC (32oF to 64oF and 82oF to 122oF)

to 18

Max voltage between T1 and T2 inputs = 1V

Max insulation temp: 260oC (500oF)
Accuracy: +

32 to 122oF (0 to 50oC); less than 80% RH

-4 to 140oF (-20 to 60oC); less than 70% RH

2.2oC or +0.75% of rdg (whichever is greater)

2 421502 Ver. 1.9 12/05