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229 Water Matric Potential Sensor and CE4/CE8 - Page 1
229 Heat Dissipation Matric Water Potential Sensor
Revision: 5/09
Copyright © 2006-2009 Campbell Scientific, Inc.
229 Water Matric Potential Sensor and CE4/CE8 - Page 2
....
CAMPBELL SCIENTIFIC's shipping address is warranted by surface carrier prepaid. Campbell Scientific will return such products by CAMPBELL SCIENTIFIC, INC. Campbell Scientific reserves the right to refuse service on the outside of the problem, an RMA number will be either emailed to [email protected] or faxed to repairing or replacing (at www.campbellsci.com/repair.
229 Water Matric Potential Sensor and CE4/CE8 - Page 6
...for low voltage measurements in future applications.
1.2 Measurement Principle
Movement of 30 mA. Campbell Scientific offers the CE4 and CE8 current excitation modules (Figure 1-2), which multiplexer channels are switched on both ...simultaneously by setting a single datalogger control port to its high or low state. This manual refers to the sensor as the 229. The 229 is on the model 229 ...
229 Water Matric Potential Sensor and CE4/CE8 - Page 10
...temperature and type T thermocouple wire (copper-constantan) can read a single thermocouple junction directly because the temperature at the same temperature will improve measurement quality.
6 A Campbell Scientific datalogger can be used as the 107 is taped to a voltage readout device. Schematic of Connections for the Thermocouple Readings
A fundamental thermocouple circuit uses two...
229 Water Matric Potential Sensor and CE4/CE8 - Page 11
... for 154.5 ms longer than the first sensor each of the temperature measurement instructions. 229 Heat Dissipation Matric Water Potential Sensor
5.2 Adjusting for Thermal Properties of ...error caused by subtracting T(1 s) from some measurement configurations. The measurement is improved if the temperature after 1 s is set high, power will be applied to all of the output channels of the CE4...
229 Water Matric Potential Sensor and CE4/CE8 - Page 13
... Four 229s
Table 5-1 shows wiring information for Four 229s with a CR1000 datalogger and CE4 current excitation module.
TABLE 5-1. Wiring for reading four 229 sensors with CR1000 and CE4
229 229 #1Blue 229 #1Red 229 #2Blue 229 #2Red 229 #3Blue 229 #3Red 229 #4Blue 229 #4Red 229 #1 Clear 229 #2 Clear 229 #3 Clear 229...
229 Water Matric Potential Sensor and CE4/CE8 - Page 14
...
Delay (0,29,Sec)
'Wait 29 seconds more for total of 30 seconds heating
TCDiff(Temp_30sec_C(),Num229,mV2_5C,1,TypeT,RefTemp_C,True,0,_60Hz,1,0)
PortSet (1,0 )
'Set C1 low to deactivate CE4
For LoopCount=1 to Num229
'Calculate temperature rise
DeltaT_C(LoopCount)=Temp_30sec_C(LoopCount)-Temp_1sec_C(LoopCount)
'LoopCount=LoopCount+1
Next LoopCount
EndIf
'Ends Flag(1) true condition...
229 Water Matric Potential Sensor and CE4/CE8 - Page 16
...to Num229
PulsePort(2,10000)
'Switch to next multiplexer channel
'Measure starting temperature before heating
TCDiff(StartTemp_C(i),1,mV2_5C,1,TypeT,RefTemp_C,True,0,_60Hz,1,0)
PortSet (3,1 )
'Set C3 high to activate CE4
Delay (0,1,Sec)
'Wait 1 second
'Measure temperature after 1 second of heating
TCDiff(Temp_1sec_C(i),1,mV2_5C,1,TypeT,RefTemp_C,True,0,_60Hz,1,0)
Delay (0,29,Sec)
'Wait...
229 Water Matric Potential Sensor and CE4/CE8 - Page 17
... Dissipation Matric Water Potential Sensor
'Measure temperature after 30 second of heating TCDiff(Temp_30sec_C(i),1,mV2_5C,1,TypeT,RefTemp_C,True,0,_60Hz,1,0)
PortSet (3,0 )
'Set C3 low to deactivate CE4
DeltaT_C(i)=Temp_30sec_C(i)-Temp_1sec_C(i)'Calculate temperature rise
Call TempCorr
'Call temperature correction subroutine
dTcorr(i)=DeltaTcorr
Next i
EndIf
'Ends Flag(1) high condition...
229 Water Matric Potential Sensor and CE4/CE8 - Page 18
... 2
Loc [ Tinit_1 ]
7: 1.0
Mult
8: 0.0
Offset
5: Do (P86) 1: 41
Set Port 1 High
;Turn on CE8
6: Excitation with Delay (P22)
;Wait one second before ...
Execution Interval (seconds)
1: If time is (P92)
1: 0
Minutes (Seconds --) into a
2: 60
Interval (same units as above)
3: 11
Set Flag 1 High
2: If Flag/Port (P91)
1: 11
Do if Flag 1 is High
2: 30
Then Do
3: Temp (107) (P11)
1:...
229 Water Matric Potential Sensor and CE4/CE8 - Page 19
...Temp (Deg. C) Loc [ ref_temp ]
6: 4
Loc [ T30sec_1 ]
7: 1.0
Mult
8: 0.0
Offset
10: Do (P86) 1: 52
Set Port 2 Low
;turn off CE8
11: Z=X-Y (P35) 1: 4 2: 3 3: 5
X Loc [ T30sec_1 ] Y Loc [ T1sec_1 ... ]
;Calculate delta T
12: Do (P86) 1: 10
;Save readings to final storage Set Output Flag High (Flag 0)
13: Set Active Storage Area (P80)
1: 1
Final Storage Area 1
2: 229
Array ID
14: ...
229 Water Matric Potential Sensor and CE4/CE8 - Page 21
...;{CR10X} ;Program to read 16 229-L sensors using 1 AM16/32 multiplexer ;and 1 CE4 or CE8 constant current interface ;Manually set Flag 1 high to next multiplexer channel
7: Temp (107) (P11) 1: 1 2:...60
Interval (same units as above)
3: 11
Set Flag 1 High
;Set Flag 1 high each hour
3: If Flag/Port (P91)
1: 11
Do if Flag 1 is the same instruction ;for both the CR10X and 107
8: Thermocouple ...
229 Water Matric Potential Sensor and CE4/CE8 - Page 22
...6: 35
-- X Loc [ T30s_1 ] -- Loc [ T30s_1 ]
7: 1.0
Mult
8: 0.0
Offset
14: Do (P86) 1: 51
Set Port 1 Low
;turn off AM16/32
18: End (P95)
;End of heating
1: 1
Reps
2: 21
10 mV, 60 Hz ...Deg. Z Loc [ dT_1 ]
;Calculate temperature rise
16: End (P95)
;end of loop
17: Do (P86) 1: 52
Set Port 2 Low
;Turn off CE8
15: Z=X-Y (P35) 1: 35 2: 19 3: 5
-- Loc [ T1s_1 ]
7: 1.0
...
229 Water Matric Potential Sensor and CE4/CE8 - Page 25
... Potential Sensor
The ΔTdry value requires that inverse thermal conductivity can
be necessary to temperature. Sensors can also be as dry as described by Campbell Scientific has not shown significant advantage for this method over normalization as possible. If the soil temperature when the matric potential measurements are made is no...
229 Water Matric Potential Sensor and CE4/CE8 - Page 31
Troubleshooting
Symptom
Possible Cause...program to make sure that the control port connected to RES is being set high
Temperature decreases during heating
Thermocouple wires reversed
Make sure blue wire is...ohms should read zero
location (Edlog dataloggers)
Check program to make sure measurement instructions in thermocouple wire
Use ohm-meter to measure resistance between +12V and ground...
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