Using the CS400/CS405 Submersible Pressure Transducer with Campbell Scientific Dataloggers
2
Output Voltage (mV)
at 0.5 mA constant
PSI range
30
5
35
10
50
15-20
63
25
75
30
65
50
3. Installation
The CS400/CS405 should be limited to an 800' cable length. Also, remember
to properly ground the datalogger to reduce the chances of damage from
lightning and reduce radio frequency and other types of electromagnetic noise.
If Campbell Scientific’s Short Cut computer program suits your
datalogging needs, you should
run Short Cut to generate the
datalogger program
and wiring assignments
instead of stepping
through the remainder of this document. Please refer to the
Factory Calibration below for the multiplier you will need.
3.1 Vent Tubes
A vent tube incorporated in the cable vents the sensor diaphragm to the
atmosphere. This eliminates the need to compensate the water level
measurement for changes in barometric pressure.
To prevent water vapor from entering the inner cavity of the sensor, the
transducers are typically shipped with the vent tubes sealed. Before operation,
visually confirm the vent tube is open. The vent tube opening must terminate
inside a desiccated enclosure or a Campbell Scientific DES2 desiccant case.
The desiccant must be changed regularly.
3.2 Dislodging Bubbles
While submersing the sensor, air bubbles may become trapped between the
pressure plate and the water surface, causing small offset errors until the
bubbles dissolve. Dislodge these bubbles by gently shaking the pressure
transducer while it’s under water.
Do not hit the sensor against the well casing or other solid
surface while dislodging the bubbles, because the
diaphragm could be damaged.
NOTE
NOTE
CAUTION
