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421502-en-GB_V2.0    3/19

 

Specifications 

Display 

 

5-digit multifunction LCD 

 

Battery Power

 

9V (NEDA 1604, IEC 6F22, or 006P)

 

Auto Power OFF (APO) 

Meter switches OFF after approx. 30 mins. of inactivity 

Battery life

 

160 hours typical with carbon zinc battery

 

Dimensions / Weight 

 

192 x 91 x 52.5mm (

7.5 x 3.6 x 2.1”)

 / 365g (11.7 oz.)

 

Type-J thermocouple range  -200 ~ 1050

o

C (-328 ~ 1922

o

F)* 

Type-K thermocouple range  -200 ~ 1370

o

C (-328 ~ 2498

o

F)* 

*

Safety note

: The supplied type-K thermocouple can only be used 

to measure temperature to 260

o

C (500

o

F). To measure higher 

temperatures please obtain a thermocouple rated for higher 
temperature 

Resolution

 

0.1

o

C (0.2

o

F)

 

Temperature units

 

Selectable 

o

C / 

o

 

Accuracy

 

± (0.05% rdg + 0.3

o

C) -50

o

C ~ 1370

o

C

 

± (0.05% rdg + 0.7

o

C) -50

o

C ~ -200

o

C

 

± (0.05% rdg + 0.6

o

F) -58

o

F ~ 2498

o

F

 

± (0.05% rdg + 1.4

o

F) -58

o

F ~ -328

o

F

 

Temperature Coefficient

 

0.1 times the applicable accuracy specifications per 

o

C from 0

o

C ~ 

18

o

C and 28

o

C ~ 50

o

C (32

o

F ~ 64

o

F and 82

o

F ~ 122

o

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 miniature thermocouple connectors

 

Supplied thermocouple

 

Type-K with Teflon® insulation. Cable length: 4 ft. (1.2m) 
Max. insulation temperature: 260

o

C (500

o

F)* 

Accuracy: ± 2.2

o

C (4

o

F) or ± 0.75% of reading (whichever is greater)  

*Safety note

: The supplied thermocouple can only be used to 

measure temperature to 260

o

C (500

o

F). To measure higher 

temperatures please obtain a thermocouple rated for higher 
temperature. 

Operating conditions

 

0 to 50

o

C (32 to 122

o

F); less than 80% RH

 

Storage conditions

 

-20 to 60

o

C (-4 to 140

o

F); less than 70% RH

 

Alarm beeper volume

 

95dB

 

 

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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