Campbell Scientific CS450/CS455 Pressure Transducer - Manual (Page 20)

CS450/CS455 Pressure Transducer
Pressure can be converted to feet of fresh water using the following simple
equation:
1 psi = 2.31 feet of water
For example, the maximum depth with a pressure range of 0 to 7.25 psig is
16.748 feet of water.
4.4 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 sensor. CAUTION
With long drops, it may be necessary to use the weighted nose cone (pn
25414).
Fasten the cable to the well head using cable ties or a weather proof strain-
relief system (CSI #7421). The cable ties should wrap around the cable jacket;
never suspend the CS450/CS455 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 operations after installation.
4.5 Other Installations
The CS450/CS455 can be installed in any position; however, when it leaves the
factory, it is tested in the vertical position. There will be an offset error if not
installed vertically. Strapping the transducer body with tie wraps or tape will
not hurt it.
If the CS450/CS455 is being installed in a fluid environment other than water,
check the compatibility of the fluid with the wetted parts of the probe and
cable.
Because the CS450/CS455 is vented, a desiccant tube must always be attached
to the CS450/CS455. When you receive the CS450/CS455, ensure that the
desiccant is blue. Replace the desiccant if it is pink or white.
4.6 Calculate Offset
The pressure created is directly proportional to the water column above the
sensor. An offset is used to correct the final measurement to any error due to
sensor zero offset or installation.
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