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User Manual
GSM120
Carbon Monoxide Meter
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0-1PPM
Normal background levels.
9 PPM
ASHRAE Standard 62-1989 for living areas.
50 PPM
OSHA enclosed space 8-hour average level. *
100 PPM
OSHA exposure limit. *
200 PPM
Mild headache, fatigue, nausea and dizziness.
800 PPM
Dizziness, nausea and convulsions.
Death within 2 to 3 hours.
*U.S. Department of Labor, Occupational Safety & Health Administration (OSHA)
Regulation 1917.24: The CO content in any enclosed space shall be maintained at not
more than 50 PPM (0.005%). Remove employees from enclosed space if the CO
concentration exceeds 100 PPM (0.01%).
Introduction
Congratulations on your purchase of the Triplett GSM120 Carbon Monoxide Meter. The GSM120
measures and displays CO concentrations between 0 and 1000 parts per million (ppm).
Safety Information
Carbon monoxide is life threatening even at relatively low concentrations;
learn and recognize the effects of CO poisoning (see Table below). Do not use
this meter as a personal safety monitoring device.
Ensure that the meter is turned on in an area free of CO.
If not, the meter will read incorrectly when
subsequently measuring CO.
Description
METER DESCRIPTION
1. LCD Display
2. Mode Button, Power/Alarm LED, Select Button
3. Power ON/OFF Button
4. CO Sensor
5. Battery Compartment
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Operation
MEASUREMENTS
IMPORTANT: Ensure that the meter is turned on in an area free of CO. If not, the meter will
read incorrectly when subsequently measuring CO.
1. Press the ON/OFF button to turn the meter on.
Allow time for the meter to perform the self- test and for the display to settle
2. To use the meter, trace the GSM120 around the area of the
suspected leak.
3. The meter will indicate the presence of CO (in ppm) on the LCD display. An audible beep will
sound at 35 ppm alerting the user that the threshold of dangerous CO levels has been detected.
The higher the concentration of CO, the faster the beeper will sound. Above 200PPM the beeper
will sound continuously.
4. To turn the meter off, press the ON/OFF key. If the meter is left on, the meter will automatically
power off after 15 minutes.
MODE Button Functions
Press the MODE button to step through the following functions..
1. Maximum Data Mode: Displays the highest reading taken. This reading
is cleared when the meter is powered off.
2. Recall Data Mode: Press the SEL button to step through and recall the
data from the 10 memory locations. The current memory location (0-9)
is displayed in the top right.
REC
MAX
MEM
3. Store Data Mode: In this mode, you can store the reading to the next
available memory location by pressing the SEL button. “REC” is
displayed in the top right.
4. Recall Alarm Mode: The meter will display the alarm level data
setting ─“30ppm”.
Zero Mode: Press the SEL button for over 8 seconds to enter the
manual zero adjusting mode. The zero value will blink and then the
display will 0 and the meter will return to the Measure Mode.
5. Measuring Time Mode/Auto Power Off disable: This mode will
display how long the meter has been on taking measurements. The
time is cleared when the meter is powered off. The auto power off
function is disabled in this mode. In all other modes, auto power off is
enabled and will power off after 15 minutes of inactivity.
6. Audible Alarm Enable/Disable: The audible alarm can be turned
on/off by pressing the SEL button. “on” or “off” will be displayed on the
LCD. The alarm light will remain enabled in either setting.
Time
REC
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Backlight In the measure mode press and hold the SEL button for 4
seconds to turn the backlight on/off. Press the MODE button
to enter maximum data mode.
Specifications
Measurement range 0-1000 ppm
Resolution 1 ppm
Accuracy ±5% or ±10 ppm (whichever is greater)
Sensor Type Stabilized electrochemical Gas-specific (CO)
Sensor Life (Typical) 3 years
Warm-up Period <2 seconds
Power supply 9V Battery (NEDA 1604 or IEC6F22)
Battery life Approx. 50 hours with alkaline battery
Operating Temperature 0 to 50
Storage Temperature -30 to 60
Operating Humidity 0 to 99% RH (non condensing)
Dimensions 160 x 56 x 40mm (6.3 x 2.2 x 1.57”)
Weight 180g (6.35oz)
You, as the end user, are legally bound (EU Battery
ordinance) to return all used batteries, disposal in the
household garbage is prohibited! You can hand over your
used batteries / accumulators at collection points in your
community or wherever batteries / accumulators are sold!
Disposal: Follow the valid legal stipulations in respect of the
disposal of the device at the end of its lifecycle
o
C (32 to 122oF)
o
C (-22 to 140oF)
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Warranty
Triplett / Jewell Instruments extends the following warranty to the original purchaser of
these goods for use. Triplett warrants to the original purchaser for use that the products
sold by it will be free from defects in workmanship and material for a period of (1) one
year from the date of purchase. This warranty does not apply to any of our products
which have been repaired or altered by unauthorized persons in any way or purchased
from unauthorized distributors so as, in our sole judgment, to injure their stability or
reliability, or which have been subject to misuse, abuse, misapplication, negligence,
accident or which have had the serial numbers altered, defaced, or removed.
Accessories, including batteries are not covered by this warranty
Copyright © 2021 Triplett
www.triplett.com
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