Martel Electronics 320 - Manual (Page 40)

The LPS battery voltage should be between 10.6 and
9.2 volts. When the voltage falls below 8.8 volts, the
LPS will automatically turn itself off to prevent
damage to the batteries due to possible cell reversal.
The battery charger used for the Model 320 should be
used for the LPS.
APPLICATION NOTES
USING
THE MODEL 320 PRESSURE
CALIBRATOR WITH A HAND PUMP
1. Safely take the instrument to be tested out of
service, equalize it, and vent it.
2. Vent the low side to atmospere and connect the
high side as shown, being very careful that there are
no leaks. Note: It is best to drain the high and low
sides to prevent liquids from entering the calibration
tubing.
3. Connect the test leads to the Model 320 mA input
and to the instrument to be calibrated to form a series
loop.
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