User's Guide
Gas Leak Detector
Model CO52
Congratulations on your purchase of the Extech C052 Gas Leak Detector. The CO52
detects the presence of gas and displays concentrations between 0 and 10000 parts per
million (ppm). Careful use of this meter will provide years of reliable service.
Sensor Light Sensor
On/Off Button
Battery Compartment (Rear)
Measurement range
0-10000 ppm
Response Time
Less than 5 seconds
Power supply
2 x AA 1.5V
Battery life
Approx. 50 hours with alkaline battery with no backlight
Approx. 30 hours with backlight operation
Operating Temperature
32 to 122 F (0 to 50 C)
Storage Temperature
-22 to 140 F (-30 to 60 C)
Operating Humidity
5 to 95% RH (non condensing)
1.5 x 10 x 1.1” (38 x 254 x 28mm)
3.5oz (100g)
Leak Detection
1. Press the ON key to power the detector
2. Hold the CO52 steady in clean ambient air during its 30 second warm up which is
indicated by the flashing PPM symbol. When completed the PPM symbol will stop
flashing and a steady ticking noise will indicate that the CO52 is ready for use.
3. Trace the CO52 around the source of the suspected leak. When leaking gas is
detected the tone will increase in pitch with increasing gas concentration.
Digital display
The digital display indicates increasing gas concentration by a three range display.
Greater than 10000 ppm
Greater than 1000 ppm but less than 10000 ppm
Greater than 100 ppm but less than 1000 ppm
Less than 100 ppm
Automatic Back Light
The CO52 will automatically reset itself to zero on activation. If necessary the CO52 will enter
into an automatic cycle to reset its zero. In this instance the unit will alarm at peak level and
decrease to zero. This process takes about 20 seconds.
Automatic Back Light
The CO52 has an automatic back light for the display, which switches on automatically in low
light conditions.
2 AA size batteries are used. The battery compartment is located at the rear of the CO52. Fit
the batteries in accordance with the diagram found within the molding. Remaining battery life
is indicated by the symbol in the digital display. If the batteries are fresh, 5 segments will be
Switch Off.
Switch the CO52 off by pressing the single on/off key. Store the CO52 in a warm dry place.
Warning! Storing in a damp environment will damage the sensor!
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 or visit our website at www.extech.com (click on ‘Contact Extech’ and go to ‘Service
Department’ to request an RA number). 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.
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.
Support Hotline (781) 890-7440Tech support: Ext. 200; Email: [email protected]
Repair/Returns: Ext. 210; Email: [email protected] Website: www.extech.com
Copyright © 2003 Extech Instruments Corporation.
All rights reserved including the right of reproduction in whole or in part in any form.
CO52 V1.0 09/03