Heath Consultants Heath Volume Corrector (HVC) - Manual (Page 28)

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Annual Checks NOTE: Heath Consultants recommends annual checks on the HVC.
1. Verify calibration and recalibrate if required.
2. Verify proper battery main voltage (1.2 - 1.5 volts).
3. Verify proper battery Lithium backup voltage (3.4 - 3.6 volts).
4. Change batteries if necessary.
5. Assure that index is operating properly.
6. Check for corrosion at wire terminations.
Pressure or Gas Temperature Calibration: Go to the HVC Host/ “Calibrate” column/
“Calibration Wizard”/ Select “Single point” or “Two point” calibration. For 2-point cal- NOW remove
pressure connection & connect gauge & pressure source. Follow the steps to complete calibration.
Note
: The HVC will use the last read pressure until the calibration is complete.
Main battery change procedure: make sure the lithium backup battery voltage is 3.5-3.6v. Pull
the main battery connector off and remove the main battery. Connect the new main battery and route the
battery wire away from the index. Secure the battery with o-ring. Note: To clear ANY alarm, Hold the
scroll button for more than 4 seconds. The main battery HPN is 77R91-1037.
Index change procedure: Remove the plate covering the main pcboard. Remove the (2) ¼-20
nuts behind the index. Lift the index out and carefully remove the wires and connector at the main
pcboard. Install the index over the ¼-20 studs. Carefully align the coupler making sure the index is
sitting flat and level. Install the washers and nuts and secure with 7/16” socket. Tip: Use a small
screwdriver or “Allen wrench” to guide the washer and nut onto the stud. Route the wires and install the
connector on the main pcboard. Re-install the plate that covers the main pcboard. The standard index
HPN is 77R61-9719.
Configuration Backup procedure: Using HVC Host, select the “Configure” column, select
“Auto Configure”, select “Backup Instrument”, select “Save”.
Configuration Restore procedure: Using HVC Host, select the “Configure” column, select
“Auto Configure”, select “Restore Instrument”, select “Restore”, select the file to restore, Select only
the items to restore or choose “All the above”.
Back-up Battery Replacement Procedure
This procedure describes how to replace the lithium back-up battery BT1 (HPN 77R65-8001) and the
profiler back-up coin cell battery BT2 (HPN 77R65-8002). It is recommended to replace both batteries at
the same time. If configured, the instrument will alert the user of a low lithium back-up battery on the
LCD and via being connected to the instrument either by direct RS-232 or modem.
Replacing the lithium back-up battery: Warning – make sure the main battery voltage is at least
1.2 V
dc
!
1.
Remove the metal shield from the PCB. Take care not to lose the hardware.
2. Locate BT1 in the lower middle part of the PCB. Refer to the photos below: