Extech Instruments 421501 Bedienungsanleitung
User's Guide
Type K Digital Thermometer
Model 421501
Introduction
Congratulations on your purchase of the Extech 421501 Type K Digital Thermometer.
This water resistant meter measures temperature with a Type K thermocouple. The
thermocouple attaches to the meter with a sub-miniature plug. The meter’s display is
backlit and includes a Data Hold feature. Other features include Max Temperature and
selectable units/resolution. This meter is shipped fully tested and calibrated and, with
proper use, will provide years of reliable service.
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Model 421501 Version 1.3 February 2006
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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 to 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 or visit our website
www.extech.com for contact information. 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.
Specifications
Display 3-1/2 digit LCD (2000 counts)
Battery Power Supply 9V DC battery.
Battery life 200 hours typical
Dimensions / Weight 7.5 x 3.6 x 2.1” (192 x 91 x 52.5mm); 11.7oz. (365g)
Range / Resolution -58 to 2000oF (-50 to 1300oC); 1oor 0.1oF/oC
Important Note: The supplied thermocouple can only
be used to measure temperature up to 500oF (260oC).
To measure higher temperatures, a high temperature
Type K thermocouple must be used.
Temperature units Selectable oC or oF temperature units
±(0.3% of reading + 1oC) from -50oC to 1000oC
±(0.5% of reading + 1oC) from 1000oC to 1300oC
Accuracy of meter
±(0.3% of reading + 2oF) from -58oF to 2000oF
Temperature Coefficient 0.1 times the applicable accuracy specifications per oC
from 0oC to 18oC and 28oC to 50oC (32oF to 64oF and
82oF to 122oF)
Water resistant housing Gasket protected front panel
Input Protection 24VAC/DC max. input on any combination of inputs
Reading rate 2.5 times per second
Thermocouple connection Meter accepts standard subminiature connector
Supplied thermocouple Teflon insulated Type K thermocouple (4’ length)
Max temperature: 500oF (260oC); For higher
temperatures, a high temp thermocouple must be used.
Accuracy: ±4oF (±2.2oC) or +0.75% of rdg
(whichever is greater) from 32 to 1472oF (0 to 800oC)
Operating conditions 32 to 122oF (0 to 50oC); less than 80% RH
Storage conditions -4 to 140oF (-20 to 60oC); less than 70% RH
Model 421501 Version 1.3 February 2006
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Meter Description
1. Thermocouple plug
2. LCD Display
3. Power ON/OFF button
4. Resolution select button
5. Maximum reading mode button
6. Rubber protective jacket
7. Unit of measure oC/o F select key
8. Backlight activation key
9. Data Hold key
Note: Battery compartment and Tilt Stand on rear of meter
Operation
Powering the Meter
Turn the meter on by pressing the POWER button. If the meter’s display does not switch
ON, check that the 9V battery is installed and is fresh. Press the POWER button to turn
the meter OFF.
Connecting a Type K thermocouple
1. Plug a Type K thermocouple into the meter’s input jack (top of meter). This meter
accepts Type K thermocouples with spade plugs (sub-miniature type).
2. If a thermocouple is not inserted to the meter or the probe is malfunctioning, all dashes
"------" will appear on the display. If dashes appear, ensure that the probe is properly
connected. If dashes appear with the probe connected, try another probe.
Taking measurements
With the thermocouple connected and the meter ON, place the thermocouple in air,
touching an object, or in a liquid solution. Read the temperature measurement on the LCD.
Important Note: The supplied thermocouple can only be used to measure temperature up
to 500oF (260oC). To measure higher temperatures, a high temperature Type K
thermocouple must be used.
Selecting oC/oF units of measure
Press the oC/oFkey to select the desired temperature unit of measure.
Selecting the Resolution
Use the 0.1o/ 1obutton to select the desired resolution. The decimal point location will
reflect each press of the resolution button.
Display Backlight
Press the backlight button (sun symbol) to turn the LCD backlight ON. Press again to turn
it OFF. Backlighting comes in handy in dimly lit areas and for nighttime use.
Data Hold
To freeze the LCD display, momentarily press the HOLD button. The 'H' icon will appear
on the LCD when the Data Hold mode is accessed. Momentarily press the HOLD button
again to return to normal operation (the 'H' hold icon will switch off).
MAX Temperature Mode
Press the MAX button to enter the Max mode (the MAX indicator will appear on the LCD).
The meter then displays only the highest reading. Each time the temperature reading
exceeds the currently displayed value, the displayed value changes and updates to the
new MAX temperature. Press the MAX button again to exit the MAX mode.
Model 421501 Version 1.3 February 2006
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Support line (781) 890-7440
Product specifications subject to change without notice
For the latest version of this User’s Guide, Software updates, and other
up-to-the-minute product information, visit our website: www.extech.com
Extech Instruments Corporation, 285 Bear Hill Rd., Waltham, MA 02451
Maintenance
Battery Replacement
When the low battery symbol appears on the display, replace the 9V battery. Follow the
steps below:
1. Remove the rubber protective jacket that encases the meter. If this jacket is not
removed, the battery compartment cannot be accessed.
2. Remove the two rear screws that secure the battery compartment.
3. Open the compartment and replace the 9V battery.
4. Secure the meter’s battery compartment and rubber jacket before using the
meter.
WARNING! To avoid possible electrical shock, disconnect the thermocouple before
removing the battery cover.
Cleaning
Use a damp cloth with a mild detergent to periodically wipe the meter housing and display
area. Do not use abrasives or solvents to clean the meter.
Calibration and Repair Services
Extech offers repair and calibration services for the products we sell. Extech also
provides NIST certification for most products. Call the Customer Service Department for
information on calibration services available for this product. Extech recommends that
annual calibrations be performed to verify meter performance and accuracy.
Copyright ©2006 Extech Instruments Corporation
All rights reserved including the right of reproduction in whole or in part in any form.
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