RKI Instruments GX-94 - Manual (Page 16)

Page 15 GX-94 Operator’s Manual
When the GX-94 successfully completes its self check, the OK
message displays instead of the STAND BY message, then the
normal operating screen displays. The normal screen displays
current concentrations for all gases. The GX-94 sounds a double
tone to indicate it is in normal operation.
2. Verify that the GX-94 is operating properly. Breathe out over the
diffusion grill of the instrument until the oxygen reading drops
below the low alarm level. The audible alarm for oxygen deficiency
will sound, the ALARM LED will blink, and “O2” will flash on the
display.
To verify detection of combustibles use a controlled source of
flammable vapor, for example a bottle of isopropyl alcohol. The
audible alarm will sound, the ALARM LED will blink, and “HC” will
flash on the display.
Caution
Do not use gas from a cigarette lighter to test response
to combustibles. Exposing the sensor to uncontrolled
high concentrations of gas in this manner will reduce
response and sensor life.
WARNING
I
F THE
GX-94
DOES NOT RESPOND TO THESE VERIFICATIONS
,
TAKE IT TO A KNOWN FRESH - AIR ENVIRONMENT , AN
ENVIRONMENT FREE OF COMBUSTIBLE AND TOXIC GASSES AND
OF NORMAL OXYGEN CONTENT (20.9%), THEN FOLLOW THE
HC 0 LEL
O2 20.
9 %
H2S 0.0PPM
CO 0PPM