Extech 421502 Instruction Manual

INSTRUCTION MANUAL

Model 421502

Dual Input Type J/K Digital Thermometer

• Dual input T1 / T2 / T1 – T2 displays

• Maximum temperature record mode

• Selectable units

• Data Hold

1. INTRODUCTION

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

1 421502es Ver. 1.7 6/00

2. 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 100 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

±(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

Temperature Coefficient 0.1 times the applicable accuracy specifications per oC

from 0oC to 18oC and 28oC to 50oC (32oF to 64oF and 82oF
to 122oF)

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

inputs. Max voltage between T1 and T2 inputs = 1V
Reading rate One reading per second
Input connectors Accepts standard miniature thermocouple connectors
Supplied thermocouple 4', type K, teflon insulation,

Max insulation temp: 260oC (500oF)

Accuracy: +2.2oC or +0.75% of rdg

(whichever is greater) from 0oC to 800oC
Ambient Operating
Range
Storage Temperature

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

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

2 421502es Ver. 1.7 6/00