Sutron Corporation X-Link Operations & Maintenance Manual, Rev 1.63 5/24/2016 pg. 102
Meas Type
Analog
Analog Type
0-5V A (or B)
Warmup
0 sec
Averaging Time
00:00:00
Sampling Interval
0.0 sec
Slope
1 for Celsius
1.8 for Fahrenheit
Offset
0 for Celsius
+32 for Fahrenheit
Use Equation
On
Equation (This is entered
all on one line in the
setup)
STEINHART(10000*X/(VREF-X)
,0.00146732513897221
,0.00023841146463031
,0.00000010078969927)
Notice that measurement interval and averaging are not addressed in this setup,
which will depend on the application requirements.
8.3.
Pressure Transducer (Analog Bridge Sensor)
Pressure transducers using a strain gauge. Analog 4 wire bridge is a common
choice for water-level applications. These transducers are designed to be driven
by an excitation voltage, VREF for this example, and the output of the bridge is a
differential reading that will have a full-scale output that is a percentage of the
excitation voltage, VREF. The sensor will have a rated pressure, and a typical full
scale output for a particular excitation voltage. This example will be for a 10 PSI
transducer that has an output of 100 mV with an excitation of 10V. Since VREF is
2.5V (1/4 of the data sheet excitation of 10V), the Full Scale, or FS, output of the
sensor will be 25 mV (1/4 of the data sheet output of 100mV). Since the
differential input range is 39.0625 mV, then the 25mV FS of the sensor is always
within range.
The nature of the bridge sensor automatically places the differential reading in
the allowable common mode range of the differential input, and in this case,
about 1.25V.
Connect the sensor as follows:
