Campbell CR510 Manual do Operador Página 95

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SECTION 7. MEASUREMENT PROGRAMMING EXAMPLES
7-17
04: Z=X+F (P34)
1: 1 X Loc [ Temp ]
2: -24 F
3: 3 Z Loc [ Temp_Comp ]
05: Z=X*F (P37)
1: 3 X Loc [ Temp_Comp ]
2: -.0698 F
3: 3 Z Loc [ Temp_Comp ]
06: Z=X+Y (P33)
1: 3 X Loc [ Temp_Comp ]
2: 2 Y Loc [ Pressure ]
3: 2 Z Loc [ Pressure ]
07: IF (X<=>F) (P89)
1: 5 X Loc [ Cmpile_Ck ]
2: 1 =
3: 0 F
4: 30 Then Do
08: Z=X+F (P34)
1: 2 X Loc [ Pressure ]
2: 47.23 F
3: 4 Z Loc [ Offset ]
09: Z=F (P30)
1: 1 F
2: 0 Exponent of 10
3: 5 Z Loc [ Cmpile_Ck ]
10: End (P95)
11: Z=X-Y (P35)
1: 4 X Loc [ Offset ]
2: 2 Y Loc [ Pressure ]
3: 6 Z Loc [ Distance ]
7.14 4 TO 20 MA SENSOR USING
CURS100 TERMINAL INPUT
MODULE
A dew point sensor has a 4 to 20 mA output
over the dew point temperature range of -40° to
+70°C. The dew point sensor output may be
measured by the CR510 using the CUS100
Terminal Input Module (TIM). The CUS100
uses a 100 , ± 0.01 % resistor to convert the 4
to 20 mA range to 400 to 2000 mV. The
millivolt range was found using the relationship
V = IR, where V is voltage, I is current, and R is
resistance, e.g. the voltage at -40°C is given by
V = 4 mA 100 = 400 mV. The dew point
sensor is measured with Instruction 2 (Volt Diff).
The multiplier for dew point temperature is
found with the following relationship [70°C -
(-40°C)] / [2000 mV - 400 mV] = 0.06875°C/mV.
The offset is found by taking the linear
relationship °C = mV Mult + Offset and solving
for the Offset. At -40°C the voltage is 400 mV,
thus the Offset = -40 - [400 mV
0.06875°C/mV] = -67.5°C.
CONNECTIONS
The dew point sensor is measured with a
differential voltage measurement on differential
analog input 1. The CURS100 TIM and dew
point sensor are wired to the CR510 terminal
strip panel as shown in Figure 7.14-1.
PROGRAM
01: Volt (Diff) (P2)
1: 1 Reps
2: 25 ±2500 mV 60 Hz Rejection
Range
3: 1 DIFF Channel
4: 1 Loc [ Dew_Pnt_C ]
5: .06875 Mult
6: -67.5 Offset
INPUT LOCATIONS
1 Dew_Pnt_C
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