Campbell Scientific CS431 Submersible Pressure Transducer - Manual (Page 6)

CS431 Submersible Pressure Transducer
3. Installation
3.1 Initial Inspection
Upon receipt of the CS431, inspect the packaging for any signs of shipping
damage and, if found, report the damage to the carrier in accordance with
policy. The contents of the package should also be inspected and a claim filed
if any shipping related damage is discovered.
Care should be taken when opening the package not to damage or cut the cable
jacket. If there is any question about damage having been caused to the cable
jacket, a thorough inspection is prudent.
The model number and pressure range is etched on the housing. Check this
information against the shipping documentation to ensure that the expected
model number and range were received.
3.2 Vent Tube
A vent tube incorporated in the cable vents the sensor diaphragm to the
atmosphere. This eliminates the need to compensate for changes in barometric
pressure.
To prevent water vapor from entering the inner cavity of the sensor, the vent
tube opening should terminate inside a desiccated enclosure or a desiccant
tube.
3.3 Water Depth
For water level measurements, the CS431 must be installed below the water at
a fixed depth. This depth should be chosen so that the water pressure will
never exceed the sensor’s pressure range. Otherwise, the output reading will
not be correct, and can be damaged if pressure is excessive (2X full scale).
Pressure can be converted to feet of fresh water using the following equation:
1 psi = 2.31 feet of water
For example, the maximum depth with a pressure range of 0 to 5 psi is 11.55
feet of water.
3.4 Well Installations
Lower the transducer to an appropriate depth.
Do not drop the instrument or allow it to “free fall” down a
well as this may damage the device. CAUTION
Fasten the cable to the well head using cable ties or a weather proof strain-
relief system (i.e., split mesh cable grip p/n 7421). The cable ties should wrap
around the cable jacket; never suspend the CS431 from the connections at the
top end of the cable. When securing the cable, care should be taken to avoid
cable damage. Sharp bends or excessive pinching of the cable can cause
damage and may pinch off the vent tube causing measurement errors.
Several readings should be taken to insure proper operation after installation.
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