CS451/CS456 Submersible Pressure Transducer
11
FIGURE 7-3. Transducer mounted in PVC pipe using the Heyco cable
grip
7.2.3 Measure the Initial Elevation
Use a staff ga
u
ge (or other device) to measure the initial elevation of water.
This value is used to calculate an offset that corrects the final measurement for
errors due to zero offset or installation.
Short Cut
will make the offset
, if not using
Short
Cut
to calculate the offset.
After installation, several readings should be taken to ensure proper operation.
7.2.4 Offset Calculation
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.
For example, if the correct elevation of the water, as measured by a staff
ga
u
ge or other measurement device, is 20 feet, and the CS451 provides a
reading of 5.76 psig, then:
5.76 psig • 2.31 ft/psig = 13.3056 ft.
So, the offset is calculated:
20 ft – 13.3056 ft = 6.6944 ft
Include an expression in the CRBasic program to account for this offset.
7.3 Wiring
Power down the system before wiring the CS451/CS456.
NOTE