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                           User Manual 

 

 
Dual Input Type J/K Digital Thermometer 
 
Model 421502

 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

 

 

Additional User Manual Translations available at 

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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