
6
Combustible Gas Sensor
All Sensit®Gold CGI instruments incorporate a highly sensi-
tiveand uniquely designed semiconductor sensor.Thefunction
and accuracy of the sensor are monitored and controlled by
specialized circuitry and a microprocessor. This sensor is ca-
pableofmeasuringconcentrationsofaslowas1ppmmethane
upto 100%LEL.Concentrationsabove 70%LELaremonitored
ormeasured simultaneously withastate-of-the-art thermal con-
ductivitysensor(TC). This sensor is capable of measuring high
concentrations of gas quickly and accurately. All readings are
automatically switched between the scales of PPM (if so
equipped),LEL and percentvolume.
Electrochemical Sensors (optional)
All Sensit®Gold CGI instruments when equipped with the fol-
lowingoptionalsensors, microprocessorand associatedcircuitry
willmeasureoxygenlevelsfrom0-25%,measurecarbon mon-
oxide(CO)levelsfrom0-2000ppmandmeasurehydrogensul-
fide(H2S) levels from0-100ppm.All gases are displayedsimul-
taneously on the display.
The Pump
TheSensit®Gold CGI instruments areequippedwithapower-
fuland efficientrotaryvane pump. Awater/dirtfilter attheendof
thegooseneckprotectsthe pump from foreign material.An ad-
ditional internal filter also helps to protect the pump from dam-
aging debris. There are audible and visual indicators that will
show a blocked or improperly operating pump.
NOTE: Operating the instrument without a sensor cap or
with an altered sensor cap can cause damage to the
SENSORTYPES AND PUMPS
7
BATTERYINSTALLATION/REPLACEMENT
instrument and void the warranty.
Batteryreplacement is necessary when thedisplay reads BAT
LOW,anaudiblealarmsoundsandthegreenreadyLEDflashes.
When the instrument remains in BAT LOW, a count down will
appear starting at 300 seconds (5 minutes) which is the maxi-
mumtimeremaining before shut down.
CAUTION: Always change batteries in an environment
free of combustible gases.
Removethebatterysleeve cover by depressing the locking tab
onthe front ofthehandle with acoinor flat objectandpulling the
handle away from the top or display area of the instrument.
NOTE: Observe the polarity markings on the inside of the
battery holder. Improper battery installation will disable
the instrument.
Place three (3) approved batteries into the battery holder. For
best results hold the battery compartment so that it lays in one
ofyour hands. With your other hand installthebatterythatgoes
towardthe front contact spring connector (top) first. The battery
that is in contact with the rear spring connector second. Finally
insert the third battery in the center position by moving the first
and second so that it compresses the spring contacts and al-
lows the battery to go into place. If you do not use one of your
handsto hold the bottom of thebatterycompartmentthebatter-
ies may come out.
Replace the battery sleeve and allow the locking tab to snap
into position. Check to be sure the handle is secure to the in-
strument body by gently pulling the handle away. The handle
will remain firmly in place if a proper connection is made.