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421502-en-GB_V2.0    3/19

 

Alarm Operation 

Press the "HI/LO Limits" button to enable the alarm mode (the meter will beep, and the 
audio icon will appear). Set the low and high alarm limits in the SET mode. When the 
actual temperature reaches the low or high alarm limit a continuous tone will be 
produced. To silence the alarm (and to disable the alarm mode), press the 

HI/LO Limit

 

button (the audio icon will disappear).  

Battery Replacement 

Replace the 9V battery when the low battery icon appears on the upper left or when the 
meter will not power up. To replace the battery, remove the 

meter’s 

protective jacket 

and remove the two screws that secure the rear battery compartment cover. Remove the 
battery, install a new battery observing correct polarity, secure the battery compartment, 
and replace the 

meter’s protective jacket

Battery Safety:

 Please dispose of batteries responsibly and never dispose of batteries in a fire, 

batteries may explode or leak. When storing the meter for 60 days or more, remove the battery 
and store separately. 

Never dispose of used batteries or rechargeable batteries in household waste.  
As consumers, users are legally required to take used batteries to appropriate collection 
sites, the retail store where the batteries were purchased, or wherever batteries are 
sold.  

Disposal: 

Do not dispose of this instrument in household waste. The user is obligated to take 

end-of-life devices to a designated collection point for the disposal of electrical and electronic 
equipment. 

Calibration and Repair Services 

FLIR Systems, Inc. offers calibration and repair services

 for the Extech brand products we sell. We 

offer NIST traceable calibration for most of our products. Contact us for information on calibration 
and repair availability, refer to the contact information below. Annual calibrations should be 
performed to verify meter performance and accuracy. Product specifications are subject to change 
without notice. Please visit our website for the most up-to-date product information: 

www.extech.com

Contact Customer Support 

Customer Support Telephone

: U.S. (866) 477-3687; Interna1 (603) 324-7800 

Calibration, Repair, and Returns email

: repair@extech.com 

Technical Support

https://support.flir.com

 

 

Copyright 

©

 2019 FLIR Systems, Inc. 

All rights reserved including the right of reproduction in whole or in part in any form 

www.extech.com

 

Summary of Contents for 421502

Page 1: ...User Manual Dual Input Type J K Digital Thermometer Model 421502 Additional User Manual Translations available at www extech com ...

Page 2: ...ion printed on buttons and secondary function printed above buttons numerical keypad and ENTER button Note The battery compartment not pictured is located on back of meter The meter s protective jacket must be removed to gain access to the compartment Operation Meter Power Ensure that a fresh 9V battery is installed rear compartment before powering the meter Press the power button upper left butto...

Page 3: ...ect the mode for the meter s secondary display lower smaller digits Choose T1 or T2 to select thermocouple input 1 or 2 for display Select T1 T2 to display the difference between the two thermocouple measurements In T1 T2 mode a reading of zero indicates that both thermocouples are reading the same temperature Set the Thermocouple type Choose Type K or Type J thermocouple using the K J buttons The...

Page 4: ... MAX button to exit and return to normal operation Relative REL Mode Primary Display Relative mode allows the user to store a reference temperature for comparison with subsequent measurements The reference temperature can be automatically or manually set for manual entry see the SET mode section For automatic entry the displayed temperature is used as the reference value Perform the steps below 1 ...

Page 5: ...Press the SET button and then the ENTER button Set the Hours Minutes and Seconds HH MM SS using the numeric buttons When editing is complete the clock will start to run Press the ENTER button three times to exit Use the SEC MIN button to switch between Hours Minutes Min and Minutes Seconds Sec display modes Setting the Alarm High Low Limits Press the SET button and then press the ENTER button twic...

Page 6: ...rgeable batteries in household waste As consumers users are legally required to take used batteries to appropriate collection sites the retail store where the batteries were purchased or wherever batteries are sold Disposal Do not dispose of this instrument in household waste The user is obligated to take end of life devices to a designated collection point for the disposal of electrical and elect...

Page 7: ... rdg 0 6o F 58o F 2498o F 0 05 rdg 1 4o F 58o F 328o F Temperature Coefficient 0 1 times the applicable accuracy specifications per o C from 0o C 18o C and 28o C 50o C 32o F 64o F and 82o F 122o F Water resistant housing Gasket protected front panel Input Protection 24VDC or 24VAC rms max input on any combination of inputs Measurement rate One reading per second Input connectors Accepts standard m...

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