VG4 Modular Camera Series Installing Roof Parapet and Pipe Mounts | en 69
Bosch Security Systems, Inc. Installation Manual F.01U.162.025 | 6.0 | 2010.03
3.11.6 Calibrating the Pressure Sensor
The VG4 Pressurized Environmental Housing features an internal low-pressure sensor alarm
which must be calibrated to the local atmospheric pressure. The heater/blower/pressure
sensor power must be connected to do calibration.
You must perform the calibration procedure within four (4) minutes of powering up the VG4
unit or the sensor will not store the calibration data. If you should miss this calibration period,
power off the unit and restart the procedure.
Once the sensor is calibrated no further adjustment is necessary. You may recalibrate the
unit, however, anytime that power is shut off to the VG4 unit.
The procedure is as follows:
1. Apply power to the VG4 unit. The green LED, located at the left side of the camera
module, illuminates and remains constant.
2. After approximately 30 seconds the LED begins to blink, indicating that the VG4 unit is
ready to be calibrated.
3. Using a thin screwdriver press and hold the red calibration switch, located on the
opposite side of the LED.
Once the sensor is calibrated and the data is permanently stored, the LED shuts off and
you can release the calibration switch.
Figure 3.20 Location of the Calibration Switch
4. Turn the power off to the VG4 unit.
1 Calibration Switch
2 Schrader Fill Valve
3LED
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