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Page 3                                                                                                                 Model 421508   Version 1.0   October 2002 

Safety Information 

 

Please read the safety and operational instructions before using this device. 

 
WARNING 

To avoid electrical shock, do not use this instrument when working near voltages over 24V 
AC/DC. 

WARNING 

To avoid damage or burns, do not make temperature measurement in microwave ovens. 

CAUTION 

Repeated flexing can break the thermocouple leads. To prolong lead life, avoid sharp 
bends in the leads, especially near the connector. 
 

This symbol on the instrument indicates that the operator must refer to an 
explanation in this manual. 

 

Meter Description 

 
 

 
 

1. Thermocouple 

inputs 

2. 

Optical PC Interface 

3. LCD 

Display 

4. Keypad 

5. 

Rubber meter holster 

6. 

Battery compartment and 

tilt stand on rear 

 
 

 
 
 
 
 
 
 
 
 

 
 


 

 
 
 
 
 
 
 

 
 

 
 
 
 

 

 
 
 
 
 
 
 

 
 
 
 
 
 
 
 

Summary of Contents for 421508

Page 1: ... Hold Relative Mode Elapsed Timer Bi directional RS 232 PC Interface Introduction Congratulations on your purchase of Extech s Dual Input 3 Display Hand Held Digital Thermometer This portable digital thermometer is designed to use external K J T E R S N type thermocouples K type supplied Temperature indication follows Reference Temperature Voltage Tables N I S T Monograph 175 Revised to ITS 90 Thi...

Page 2: ...ther ranges T type 328 to 752 o F 200 to 400 o C 0 1 o F 0 1 o C from 0 to 600 o F 0 2 o F all other ranges E type 346 to 1454 o F 210 to 790 o C 0 1 o F 0 1 o C from 0 to 450 o F 0 2 o F all other ranges R type 32 to 3212 o F 0 to 1767 o C 1 o F 1 o C S type 32 to 3212 o F 0 to 1767 o C 1 o F 1 o C N type 58 to 2372 o F 50 to 1300 o C 0 2 o F 0 1 o C Accuracy Specifications Thermocouple Accuracy ...

Page 3: ...r burns do not make temperature measurement in microwave ovens CAUTION Repeated flexing can break the thermocouple leads To prolong lead life avoid sharp bends in the leads especially near the connector This symbol on the instrument indicates that the operator must refer to an explanation in this manual Meter Description 1 Thermocouple inputs 2 Optical PC Interface 3 LCD Display 4 Keypad 5 Rubber ...

Page 4: ...se the TYPE key to select the thermocouple type K J T E R S or N that is connected to the T1 input The thermocouple type is indicated on the left side of the LCD When the thermometer is turned on it remembers the type used when the thermometer was last turned off MIN MAX Key Note Auto Power OFF and several keys C F REL SET HI LO TYPE and T1 T2 T1 T2 are defeated in this mode Press MIN MAX to enter...

Page 5: ...r the programmed data and queue the next SET parameter a Setting the Relative Mode reference value Press the SET key to enter the Relative value setting mode When in this mode dashes are displayed on the main display Manually program the desired value via the numeric keys Press the ENTER key to store the relative value and move to the High Low Limit setting mode b Setting the High and Low Alarm Li...

Page 6: ...e Extech recommends that calibration be performed on an annual basis to ensure calibration integrity Warranty EXTECH INSTRUMENTS CORPORATION warrants this instrument to be free of defects in parts and workmanship for one year from date of shipment a six month limited warranty applies on sensors and cables If it should become necessary to return the instrument for service during or beyond the warra...

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