CPS GS40 User manual

Combustible Gas Detector
INSTRUCTION MANUAL
GS40
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SPECIFICATIONS
Sensitivity 25 TO 1000 PPM, depending on the
type of impurity
Sensor Warm
Up Time Approximately 30 seconds
Response
Time Less than 20 seconds
Operating
Temperature 15 ˚F to 104 ˚F (-10 ˚C to 40 ˚C)
Power
Requirements 4 AA alkaline or NiMH batteries
Battery Life
Approximately 20 hours with AA
alkaline batteries and 10 hours with
NiMH.
Weight 13.5 Oz. (380 g.)
Dimensions 8" x 2.7" x 1.5"
(20.3 cm. x 6.9 cm. x 3.8 cm.)
Probe Length 18" (46 cm.)
TABLE OF CONTENTS
English 2-6
Español 8-12
Deutsch 14-18
Français 20-24
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PARTIAL LIST OF DETECTABLE GASES
Acetylene (50 ppm) Hydrogen Sulfide
(10 ppm)
Ammonia (30 ppm) Isopropanol (100 ppm)
Benzene (150 ppm) Methane (Natural Gas)
(30 ppm)
Butane (25 ppm) Methanol (50 ppm)
Carbon Monoxide
(1000 ppm)
Methyl Ethyl Ketone
(50 ppm)
Ethanol (25 ppm) Propane (25 ppm)
Hydrogen (25 ppm) (ppm) = Minimum
Detectable Concetration
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GENERAL DESCRIPTION
The GS-40 is a completely self contained combustible gas leak
detector designed to pinpoint gas leaks in the most demanding
applications. An efficient and sensitive gas sensor is combined
with solid state circuitry which provides an audible alarm that
increases in pitch as the concentration of the gas increases. A
visual indication is also provided as well as provisions for an
earphoneforuseinnoisyenvironments.
The sensor has been extensively tested and averages a useful
life of five years in normal operation. The sensor is capable of
responding to a wide range of combustible gases and other
toxic contaminants. Response levels as low as 25 ppm are
possible.
A modern design, combined with an efficient heated Tin Oxide
sensor, allows long operating life from a battery pack of only 4
AA cells. This allows for a very portable, lightweight instrument
featuring an 18 inch—46 cm—flexible metal probe capable of
reachingthemostdifficultlocations.
The operation of the GS-40 is fully automatic; no manual
adjustment is needed to obtain the full benefits of its unique
sensitivityandstability. Simplyturnthe ON-OFF switchtoeither
its HI or LO sensitivity positions, wait a short period of time
while the instrument automatically warms up the sensor, and
balances itself to the surrounding atmosphere, and the GS-40
willstart itsaudible alarmat aslow tickingrate to signal that it is
ready to search for leaks. During the warm up time, a bright red
LED signals the state of the battery pack: fully illuminated if the
batteriesareOKordimlylitifthe batteriesneedchanging.
The sensor in the GS-40 has a normal life of over 5 years.
However, if accidental damage to the sensor occurs by getting
wet or clogged, it can be easily replaced as indicated in the
maintenancesection.
The GS-40 is not intrinsically safe in Class 1, Division 1
atmospheres and should be turned on and off in areas where
nocombustiblegasesarepresent.
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Install 4 alkaline AA batteries in the
battery compartment as shown in-
side battery compartment.
Turn the instrument ON by sliding the
front panel switch to either the LO
position as shown in Fig 2. This sets
the instrument to its low sensitivity
setting.
CAUTION: perform this step and the
previous one in an atmosphere free
of contaminants.
Wait approximately 30 seconds un-
til the audible alarm starts to tick at
a slow rate.
Start searching for leaks.
If no leaks are found, exit to an area free from contami-
nants, switch the instrument to the HI sensitivity setting
and repeat from step 3.
1.
2.
3.
4.
5.
OPERATION
TheGS-40 isa fullyautomatic instrument and it willadjust itself
to any background contamination. This means that if the user
walks into an area where there is a background concentration
of contaminants, there will be an alarm, but the unit will quickly
adjust itself to the background and will resume its slow ticking
rate.
CAUTION: If a background indication is detected, it is best to
returntoanareafreeofcontamination,turnofftheinstrument,
ventilatetheareaandrepeattheoperationfromStep2.
If large leaks are present, the high sensitivity of the GS-40 will
makeitdifficulttopinpointthesourceoftheleak.Inthosecases,
exitto an areafreefrom contaminants,setthe sensitivityswitch
to LO and repeat the search procedure from Step 3. Large leaks
shouldberepairedfirst.
The best procedure to find a leak with the GS-40 is to sweep
the sensor back and forth over suspected areas such as joints,
fittings and valves. Repeated alarms over the same spot are a
sureindicationofaleak.
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Fig 2
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MAINTENANCE
The GS-40 is a rugged instrument designed with the durabil-
ity and reliability demands of the service industry in mind. Al-
though no regular maintenance is required other than replac-
ing the batteries, some care should be observed to ensure the
maximum life and performance.
SENSOR CARE:
The gas sensor used in the GS-40 is the product of years
of research and development. It’s miniature size and low
power consumption allows extended operation in portable
equipment.
The sensor has a metal grill at the
front. This grill allows the contami-
nants to come in contact with the
sensing element inside and should
never be allowed to become clogged
with dirt or grease. If this should
happen, the sensor becomes use-
less and needs to be replaced. No
water should be allowed to penetrate
the sensor. If this happens, the sen-
sor must be replaced.
SENSOR REPLACEMENT:
To replace the sensor, simply unscrew the front of the sen-
sor housing, pull the sensor out, plug the replacement sen-
sor into its socket, first aligning the metal tab on the sensor
shell with the notch in the sensor housing, and screw the
front of the sensor housing back in place.
See Fig 3 for details.
BATTERY REPLACEMENT:
When the red LED on the front panel lights dimly, it is
time to replace the batteries. Even though the GS-40 will
still operate for some time when the LED is dimly lit, it is
recommended never to let the LED be completely extin-
guished. Replace the batteries with a fresh set of 4 alka-
line AA cells as indicated in Fig 1. A set of 4 rechargeable
Nickel Metal Hydride cells can also be used but they cannot
be recharged in the instrument; use the charger recom-
mended by the manufacturer of the batteries.
1.
2.
3.
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Fig 3
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WARRANTY
CPS®guarantees that all products are free of manufac-
turing and material defects for one year from the date of
purchase. If a product should fail during the guarantee
period due to defective material or workmanship, it will
be repaired or replaced (at our option) at no charge.
This guarantee does not apply to products that have
been altered, misused or are in need of field service
maintenance. All repaired products will carry an inde-
pendent 90 day warranty. LS3000B and LS790B carry
a 2 year warranty.
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