The extended probe has a similar effect to the x30 nozzle. Note that the response and
cleardown times are increased when the extended probe is fitted.
To restore the instrument to its normal state, remove the nozzle and press
PEAK HOLD
and
GAS GROUP
to remove the Nozzle Present symbol.
4.5 Calibration
The instrument is not intended for accurate measurement of leaks; for normal leak
tracing, no calibration is necessary. The instrument is factory calibrated to a helium
leak. However, it is possible to improve the accuracy of the instrument for a particular
gas by calibrating it. You will need access to a standard leak, or known concentration of
the required gas.
1. Set up the instrument to the required state: units, nozzle (not) present and gas
group.
2. Present the instrument with a null sample (air) and press
ZERO
.
3. Hold down
ZERO
and press
POWER
briefly. Release both buttons. The units
indication on the display will flash to indicate that the instrument is in calibration
mode. The audible ticks are disabled.
4. Present a standard leak, or concentration of gas, to the instrument.
5. Set the display bargraph and exponent to read the standard leak flow rate or
concentration: use
PEAK HOLD
to increase the displayed value, or
GAS GROUP
to reduce it.
6. Pressing
ZERO
will zero the display. Pressing
POWER
will set the calibration to the
general default. The
symbol will become visible to indicate that the general
default calibration is in use.
7. Press
ZERO
and
POWER
again to restore normal instrument operation.
8. Check that the instrument reads the correct flow rate or concentration when
presented with the standard leak rate or concentration.
Section 5 Batteries
Either a standard alkaline, or rechargeable Ni-Cad, battery may be used. Change, or
replace, the battery if the Battery Low symbol
appears on the display. If the
battery voltage falls to an unacceptable level the instrument will switch itself off.
To change the battery, turn off the instrument, remove the battery cover on the rear
cover, unplug the old battery, install the new one in its place.
The instrument will run from the battery or the AC adapter. The internal battery is
disconnected when the adapter is plugged in.
INT-0124-XX 10
