Campbell Scientific 253 253-L and 257-L (Watermark 200) Soil Matric Potential - Page 28

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253-L and 257-L Soil Matric Potential Sensors ;Apply Temperature correction and sensor ;Calibration to kOhm measurements. ;Temperature correct kOhms 8: Z=X/Y (P38) 1: 2 X Loc [ kOhms ] 2: 4 Y Loc [ CorFactr ] 3: 3 Z Loc [ WP_kPa ] ;Apply calibration slope and offset 9: Z=X*F (P37) 1: 3 X Loc [ WP_kPa ] 2: 7.407 F 3: 3 Z Loc [ WP_kPa ] 10: Z=X+F (P34) 1: 3 X Loc [ WP_kPa ] 2: -3.704 F 3: 3 Z Loc [ WP_kPa ] ;Send measurements to final storage hourly 11: If time is (P92) 1: 0 Minutes (Seconds --) into a 2: 60 Interval (same units as above) 3: 10 Set Output Flag High (Flag 0) 12: Set Active Storage Area (P80) 1: 1 Final Storage Area 1 2: 60 Array ID 13: Real Time (P77) 1: 1220 Year,Day,Hour/Minute (midnight = 2400) 14: Average (P71) 1: 1 Reps 2: 1 Loc [ Tsoil_C ] 15: Sample (P70) 1: 1 Reps 2: 3 Loc [ WP_kPa ] 7.3.2 253 Program Examples 7.3.2.1 Program Example #3 - Five 107 Temperature Probes and Five 253's on AM16/32 and CR1000 The following example demonstrates the programming used to measure five 107 temperature probes and five 253 sensors on an AM16/32 multiplexer (4x16 mode) with the CR1000 datalogger. In this example, a 107 temperature probe is buried at the same depth as a corresponding 253 sensor. The linear equation is used and the non-linear equation is included in the program notes. To use the non-linear equation, remove the linear equation from the program and uncomment the non-linear equation. Voltage range codes for other CRBasic dataloggers are shown in TABLE 7-1. Sensor wiring is shown in TABLE 7-7. 22

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253-L and 257-L Soil Matric Potential Sensors
;Apply Temperature correction and sensor
;Calibration to kOhm measurements.
;Temperature correct kOhms
8:
Z=X/Y (P38)
1:
2
X Loc [ kOhms
]
2:
4
Y Loc [ CorFactr
]
3:
3
Z Loc [ WP_kPa
]
;Apply calibration slope and offset
9:
Z=X*F (P37)
1:
3
X Loc [ WP_kPa
]
2:
7.407
F
3:
3
Z Loc [ WP_kPa
]
10:
Z=X+F (P34)
1:
3
X Loc [ WP_kPa
]
2:
-3.704
F
3:
3
Z Loc [ WP_kPa
]
;Send measurements to final storage hourly
11:
If time is (P92)
1:
0
Minutes (Seconds --) into a
2:
60
Interval (same units as above)
3:
10
Set Output Flag High (Flag 0)
12:
Set Active Storage Area (P80)
1:
1
Final Storage Area 1
2:
60
Array ID
13:
Real Time (P77)
1:
1220
Year,Day,Hour/Minute (midnight = 2400)
14:
Average (P71)
1:
1
Reps
2:
1
Loc [ Tsoil_C
]
15:
Sample (P70)
1:
1
Reps
2:
3
Loc [ WP_kPa
]
7.3.2 253 Program Examples
7.3.2.1 Program Example #3 — Five 107 Temperature Probes and Five 253’s on AM16/32
and CR1000
The following example demonstrates the programming used to measure five
107 temperature probes and five 253 sensors on an AM16/32 multiplexer
(4x16 mode) with the CR1000 datalogger.
In this example, a 107 temperature
probe is buried at the same depth as a corresponding 253 sensor.
The linear
equation is used and the non-linear equation is included in the program notes.
To use the non-linear equation, remove the linear equation from the program
and uncomment the non-linear equation.
Voltage range codes for other
CRBasic dataloggers are shown in TABLE 7-1.
Sensor wiring is shown in
TABLE 7-7.
22