6
7
CALIBRATION
Generally, it is not necessary to perform calibrations on the
pressure meter or the external pressure sensor. Each unit is
preadjusted and calibrated.
Zero Calibration
After a long period of operation or due to the environment, the zero
and gain (span) may drift. To ensure an accurate reading, perform
a Zero Calibration as follows:
1. Connect the pressure sensor and shut on the meter.
2. Press and hold both the
MAX/MIN
Button and the
HOLD
Button.
The zero value will be displayed in both large and small digits.
3. Continue pressing the
MAX/MIN
and
HOLD
Buttons and press
the
ZERO
Button. The display will flash once and return to zero.
4. Release all three buttons and the new zero value will be stored.
Gain Calibration (Span Adjust)
1. Turn on the meter and allow it to warm up for two minutes.
2.
Push the
ZERO
Button.
3.
Connect the pressure regulator to a nitrogen bottle and the
reference gauge to the pressure regulator.
4.
Press and hold both the
MAX/MIN
Button and the
HOLD
Button.
Results will be displayed in both the large and the small digits.
5. Continue pressing the
MAX/MIN
and
HOLD
Buttons and press
the
SENSOR TYPE
Button once, to add one count to the small
digit value.
6. Press the
UNIT
Button once to decrease the small digit value by
one count.
7. When the desired value is reached (for example 9.00), release
the
HOLD
and
MAX/MIN
Buttons. The display will flash. Push
the
SENSOR TYPE
Button within 5 seconds. The new gain
value will be stored in the unit.
BATTERY REPLACEMENT
When the top left corner of LCD display indicates “LBT,” it is time
to replace the battery. Accurate readings may be taken for several
hours after the low battery indicator appears. Open the battery
cover, install a fresh 9V battery and replace the cover.
