Test Products International HXG2 - Manual (Page 8)

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CAUTION: To verify the operation of this
instrument it is necessary to apply com-
bustible gas to the sensor head. The tick
should increase and alarms may sound. To
verify accuracy calibration must be per-
formed.
A calibration kit complete with regulator, cali-
bration gas, calibration cup and easy to use
instructions is available from your distributor
or J And N Enterprises, Inc.
CALIBRATION ADJUSTMENT
To confirm the original factory calibrated alarm
set point of 0.5% methane (10% LEL meth-
ane) use calibration kit part #S0157-1 for the
following proceedures.
1. Turn on the unit in a gas free environment
for a 10 minute warm up.
2. Attach the regulator to the calibration gas
cylinder (0.5% methane). Attach the calibra-
tion adapter to the regulator, gas flow starts
automatically. Immediately insert the sensor
into the calibration adapter.
3. If necessary, adjust the alarm set knob
slowly until the red alarm light and alarm tone
activate.
4. Disconnect the calibration adapter from the
regulator to conserve gas.
OPERATING TIPS
1. Turn the instrument on in a noncontami-
nated atmosphere. The instrument will go
through a warm-up process.
2. During warm-up it is normal but not re-
quired that the ticking sound increases and
the alarm indicates for a short time. While
the instrument is warming up the tick rate will
slowly decrease until it becomes steady. The
alarm will also stop indicating as the instru-
ment completes warm-up. The time required
for this will vary depending on the duration of
time since the instrument was last used.
CAUTION: If the instrument is in an area
where detectable gases are present, the
alarm may not stop.
3. Once warm-up is complete adjust the ”Tick
Adjust” control to establish a slow uniform
tick rate. Only after the tick rate remains steady
is the instrument ready for calibrated use. To
identify the presence of gas vapors or leaks
listen for any change in the tick rate. If the tick
rate increases, the instrument has detected
the presence or location of a leak. As the
level of gas increases the tick rate will in-
crease accordingly. If the alarm is indicating,
the level of gas is near or above 0.5% gas or
approximately at a minimum of 10% of LEL
methane. This indicates a potentially haz-
ardous atmosphere. When the instrument
alarms a flashing red light will appear and an
audible warbling tone will sound.
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