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421502-en-GB_V2.0    3/19

 

MIN-MAX-AVG mode (Primary Display) 

1.

 

Press the "MIN-MAX" button to access the mode and to start recording the 
minimum, maximum, and average temperature readings 

2.

 

Use the 

“MIN

-

MAX” 

button to step through MIN, MAX, and AVG modes (the display 

icons MIN, MAX, and AVG will change with each button press) 

3.

 

When a new MIN or MAX is detected, the previous MIN or MAX is replaced. An 
audible beep alerts the user when a new MIN or MAX is recorded 

4.

 

Use the “HOLD” button to 

pause/resume recording

 

5.

 

Long press the “MIN

-

MAX” button to exit and 

to reset the MIN-MAX-AVG memory 

 

6.

 

When recording is paused, the stored values are held in memory until MIN-MAX-
AVG mode is canceled or resumed

 

7.

 

The Auto Power OFF utility is disabled, and the meter cannot be manually powered 
OFF, in the MIN-MAX-AVG mode. 

Long press the “MIN

-

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.

 

Press the “REL” button (the REL icon appears)

 

2.

 

The currently displayed temperature becomes the reference value and 
subsequent measurements represent the actual temperature minus the 
reference temperature 

3.

 

Press the 

“REL” button

 to exit (the REL icon will switch OFF) 

Real Time Clock and Elapsed Timer 

The time display (bottom right) shows the real time clock. Refer to the SET mode section 
to set the real time clock. The clock can also be used as an elapsed timer by resetting the 
clock to zero. The clock allows you to see when MIN-MAX updates occur. Each time a new 
MIN or MAX value is updated, the associated time is stored.  
 
 
 
 
 
 
 
 

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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