V1.5 1/03
2
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 warranty period, contact the Customer Service Department at
(781) 890-7440 ext. 210 for authorization.
A Return Authorization (RA) number must be
issued before any product is returned to Extech.
The sender is responsible for shipping
charges, freight, insurance and proper packaging to prevent damage in transit. This warranty
does not apply to defects resulting from action of the user such as misuse, improper wiring,
operation outside of specification, improper maintenance or repair, or unauthorized
modification. Extech specifically disclaims any implied warranties or merchantability or fitness
for a specific purpose and will not be liable for any direct, indirect, incidental or consequential
damages. Extech's total liability is limited to repair or replacement of the product. The
warranty set forth above is inclusive and no other warranty, whether written or oral, is
expressed or implied.
Safety Precautions
1. Make sure any covers or battery doors are properly closed and secured.
2. Remove the battery from the meter if the meter is to be stored for long periods.
3. Touching the thermocouple to a device which is powered electrically can cause
damage to the meter and may pose a shock hazard.
4. To avoid damage do not make temperature measurements in microwave ovens.
Specifications
Display
3 ½ digit (1999 Count) LCD (Liquid Crystal Display)
Temperature Scale
ºC or ºF (user-selectable)
Thermocouple type
Model 42311: type J; Model 42312: type K
Measurement and
Model 42312: -40º to 2000ºF (-40º to 1350ºC)
Source Ranges
Model 42311: -40º to 1400ºF (-40º to 760ºC)
Resolution
1ºC/F or 0.1ºC/F (< 200ºF/C)
Accuracy
±(0.1% rdg + 2ºF) or ±(0.1% rdg + 1ºC)
Temp. Coefficient
0.1 times the applicable accuracy spec per ºC or ºF from
32º to 64ºF and 82º to 122ºF (0º to 18ºC and 28º to 50ºC)
Input Protection
24VDC or 24VAC RMS maximum input voltage
Display Update
2.5 times per second
Input Connector
Accepts standard subminiature thermocouple connectors
Battery
9V battery (200 hour typical battery life)
Dimensions/Weight
7.5x3.54x2.1 inches (190x90x53 mm) / 1 lb (440g)
