Interscan Corporation GF1900, Manual, Page: 9 / 23

SULFURYL FLUORIDE MANUAL REV C PAGE 9 OF 23 04/07/11
OPERATION
1) Turn the FUNCTION SWITCH knob to the OFF position and connect an AC
power supply or battery pack. Tighten the connector completely.
NOTE: Turn only the knurled ring to tighten. Tightening the connection
by turning any other portion of cable can result in a short, fire, or explosion.
2) Turn the
FUNCTION SWITCH
to
ON
or
BAT TEST
and wait for the
READY
indicator to light.
3) After the READY light is ON, set the meter to ZERO with the ZERO knob.
NOTE : New or replacement sensors may require approximately 24 hours to stabilize prior to
zeroing. For best results (to prevent zero drift) the
first
time the monitor is used during the
day, set the meter to 20 after the READY light is ON. If the meter is moving up or down,
wait until it stops. Then adjust the meter to ZERO. An alternative is to turn the unit ON in
the shop, first thing in the morning for 20 or 30 minutes. In this case, no meter adjustment is
necessary.
4) The unit is now ready to use.
5) When using the battery pack, the LO BAT indicator will light when there is
approximately 10 minutes operating time left. After the light is ON, turn the control
knob to
BAT TEST
to see if the meter is ON, or to the left of the BAT line. If the
meter is to the right of the line, turn back to ON for continued gas readings. Check the
battery condition every few minutes. When the meter shows
LO BAT , turn the control
knob to OFF.
6) Recharge batteries overnight. Approximately eight (8) to ten (10) hours.
7) Approximately 70 minutes operating time is available with a fully-charged battery pack.
NOTE
: Disregard a LO BAT indication when using an AC power source.