Campbell Scientific CS431 Submersible Pressure Transducer - Manual (Page 10)

CS431 Submersible Pressure Transducer
This function is designed for the thermistor used in the CS431. It
automatically selects the excitation voltage and processes the result using the
Steinhart-Hart calculation to get an output in degrees centigrade.
5.1.1 Example CRBasic Programs
The following two examples are for the CR1000 but other CRBasic
dataloggers are programmed similarly. Table 5-1 shows the wiring used for
these examples.
TABLE 5-1. CR1000 Connections for Example Programs
Single Ended
Channel Number Differential
Channel Number
Sensor 1
Sensor2
1 1H 1 1H Vr+ (Blue)
2 1L Vr- (Red)
AG (Green)
3 2H Vo+ (Yellow)
4 2L Vo- (Purple)
Temperature AG (Black)
5 3H Temperature Out (Brown)
6 3L Temperature Out (Brown)
7 4H Vr+ (Blue)
8 4L Vr- (Red)
AG (Green)
Ex1 Excite (White) Excite (White)
9 5H Vo+ (Yellow)
10 5L Vo- (Purple)
Temperature AG (Black)
Ex2 Temperature Excite (Orange) Temperature Excite (Orange)
Ground Lug Shield Shield
5.1.1.1 Example CR1000 P ROGRAM – S TANDARD C ALIBRATION – Two Sensors
'Program = Sample Program for two CS431s
'Sensor 1 is 5 psig, Sensor 2 is 15 psig
'Declare Variables and Units
Public Mult(2)
'calibration multiplier, one per sensor
Public Offset(2) 'calibration offset, one per sensor
'multipliers and offsets provided on INW calibration sheet
Public
V(4) 'reference voltage, then output voltage for each sensor
'For example: V(1)=Vr for 1st sensor, V(2)=Vo for 1st sensor
'V(3)=Vr for 2nd sensor, V)4)=Vo for 2nd sensor
(cont.)
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