Calibrating The Pressure Sensor - Bosch VG4-161-CC0 Installation Manual

72 en | Installing Roof Parapet and Pipe Mounts
Connections for Fiber Optic Models
The following procedure references Figure 3.6, Page 56.
1.
2.
NOTICE! A BNC barrel connector (not supplied) is required to connect the male BNC of the
dome to the male BNC connector of the Fiber Optic Module.
3.
3.11.7

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.
2.
3.
F.01U.216.010 | 8.0 | 2011.02
If installing a Fiber Optic model, attach the incoming ST fiber plug to its mating
connector on the Fiber Optic Module in the power box.
Connect the video BNC connector from the dome to the Fiber Optic Module BNC
connector.
Connect the six (6) control plugs from the dome, installed previously, to the P106 control
I/O connector in the Power Supply Box.
Apply power to the VG4 unit. The single green LED, located near the yellow camera latch
at the side of the camera closest to the Schrader valve, illuminates and remains constant.
After approximately 30 seconds the LED begins to blink, indicating that the VG4 unit is
ready for calibration.
Using a non-conductive tool 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. In addition, a live view of the video displays the
Low Pressure alarm message.
Installation Manual
VG4 Modular Camera Series
Bosch Security Systems, Inc.