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CRBasic Example 2: 4-Wire half bridge CR1000X program

'CR1000X Series data logger
'This example program measures a single 110PV-L probe using the
'BRHalf4W instruction once a second and stores the
'average temperature in degrees C every 10 minutes.

'Declare variables for temperature measurement using Half Bridge configuration

Public

T110PV_mV

Public

T110PV_Res

Public

T110PV_Temp_C

Public

T110PV_Temp_F

'Declare constants to be used in Steinhart-Hart equation

Const

A=1.129241*10^-3

Const

B=2.341077*10^-4

Const

C=8.775468*10^-8

'Declare variable units

Units

T110PV_mV= millivolts

Units

T110PV_Res=Ohms

Units

T110PV_Temp_C=Deg C

Units

T110PV_Temp_F=Deg F

'Define a data table for 10 minute averages

DataTable

(AvgTemp,1,-1)

DataInterval

(0,10,Min,10)

Average

(1,T110PV_Temp_C,FP2,False)

EndTable

BeginProg

Scan

(1,Sec,3,0)

'Measure 110PV-L probe

BrHalf4W

(T110PV_mV,1,mV5000,mV5000,1,Vx1,1,2500,True,True,0,60,1.0,0)

'Convert mV to ohms

 T110PV_Res=4990 *T110PV_mV

'Use the Steinhart-Hart equation to convert resistance to temperature

 T110PV_Temp_C = (1/(A+B*

LN

(T110C*(

LN

(T110PV_Res))^3))-273.15

'Convert Celsius to Fahrenheit

 T110PV_Temp_F = T110PV_Temp_C * 1.8 + 32

CallTable

AvgTemp

NextScan

EndProg

110PV Surface Temperature Probe

19

Содержание 110PV

Страница 1: ...Revision 07 2020 Copyright 2010 2020 Campbell Scientific CSL I D 897...

Страница 2: ......

Страница 3: ...under guarantee or not Please state the faults as clearly as possible and if the product is out of the guarantee period it should be accompanied by a purchase order Quotations for repairs can be give...

Страница 4: ......

Страница 5: ...digital cell phones and aerials may also not be applicable according to your locality Some brackets shields and enclosure options including wiring are not sold as standard items in the European marke...

Страница 6: ......

Страница 7: ...beginning work Wear a hardhat and eye protection and take other appropriate safety precautions while working on or around tripods and towers Do not climb tripods or towers at any time and prohibit cl...

Страница 8: ......

Страница 9: ...pe 9 7 3 Wiring 10 7 4 Data logger programming 12 7 4 1 Resistance measurement 12 7 4 2 Converting resistance measurement to temperature 12 8 Operation 13 8 1 Measurement details 13 8 2 Electrical noi...

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Страница 11: ...ng the sensor head off will likely damage both the sensor and PV module see Caution at the end of Troubleshooting p 14 l The 110PV cable must be properly strain relieved after mounting the probe to th...

Страница 12: ...ideo that describes data logger programming using Short Cut is available at www campbellsci eu videos cr1000x data logger getting started program part 3 Short Cut is an easy way to program your data l...

Страница 13: ...s value is unique for each 110PV and is printed on the heat shrink label attached to the sensor cable 4 Click on the Wiring tab to see how the sensor is to be wired to the data logger Short Cut uses a...

Страница 14: ...sh and save the program Send the program just created to the data logger if the data logger is connected to the computer 9 If the sensor is connected to the data logger check the output of the sensor...

Страница 15: ...adhesive tab on the aluminium disk fastens the 110PV to the measurement surface If the temperature may exceed 70 C also use extreme sealing tape to secure the probe to the measurement surface Features...

Страница 16: ...l range 50 to 140 C Accuracy1 Worst case 0 2 C 40 to 70 C 0 5 C 71 to 105 C 1 C 106 to 135 C Maximum Steinhart Hart linearization error 0 0024 C at 40 C Maximum cable length 304 8 m 1000 ft Disk diame...

Страница 17: ...coefficient Effects of cable resistance is discussed in Long cable lengths p 14 7 Installation If you are programming your data logger with Short Cut skip Wiring p 10 and Data logger programming p 12...

Страница 18: ...to a clean surface for its adhesive to function properly CAUTION Do not use epoxy to secure the sensor head to a PV module 7 2 2 Cable strain relief The cable must be properly strain relieved after m...

Страница 19: ...isk is adequately fastened to the measurement surface use three strips of extreme sealing tape in two places each 1 Place a strip of tape across the sensor head perpendicular to the cable and rub the...

Страница 20: ...Proper tape usage 7 3 Wiring FIGURE 7 3 p 11 provides the schematic and Table 7 1 p 11 provides the connections to Campbell Scientific data loggers Either a 4 wire half bridge or 3 wire half bridge c...

Страница 21: ...voltage input U configured for differential input1 SE single ended analogue voltage input Purple Signal reference U configured for differential input1 DIFF L differential low analogue voltage input a...

Страница 22: ...ded in the following section Complete program examples for select CRBasic data loggers can be found in Example programs p 17 If applicable please read Electrical noisy environments p 14 and Long cable...

Страница 23: ...ur data loggers Simple half bridge measurement ignoring cable resistance has a measured voltage V of V Vx 4990 4990 Rt Where Vx is the excitation voltage 4990 ohms is the resistance of the fixed resis...

Страница 24: ...settling time is the delay before the measurement is made Longer settling times can be typed into the Settling Time parameter in the BrHalf4W or BrHalf instruction 9 Maintenance and troubleshooting NO...

Страница 25: ...ld wire is connected to data logger ground and the data logger is properly grounded CAUTION If the 110PV needs to be sent to Campbell Scientific for repairs the probe must be heated to 70 to 80 C befo...

Страница 26: ......

Страница 27: ...for additional refinement NOTE Once the file is edited with CRBasic Editor Short Cut can no longer be used to edit the program it created 2 To add the Short Cut wiring information into the new CRBasic...

Страница 28: ......

Страница 29: ...f4W instruction to measure the 110PV The following table provides wiring for the example programs Table B 1 Wiring for example programs Colour Description Data logger connection BrHalf BrHalf4W Black...

Страница 30: ...le units Units T110PV_mV millivolts Units T110PV_Res Ohms Units T110PV_Temp_C Deg C Units T110PV_Temp_F Deg F Define a data table for 10 minute averages DataTable AvgTemp 1 1 DataInterval 0 10 Min 10...

Страница 31: ...nst C 8 775468 10 8 Declare variable units Units T110PV_mV millivolts Units T110PV_Res Ohms Units T110PV_Temp_C Deg C Units T110PV_Temp_F Deg F Define a data table for 10 minute averages DataTable Avg...

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Страница 33: ...ver at very low temperatures 40 C the bond strength decreases Solvent resistance No apparent degradation when exposed to splash testing of many common solvents and fluids including gasoline JP 4 fuel...

Страница 34: ...nfo campbellsci fr www campbellsci fr Germany Location Phone Email Website Bremen Germany 49 0 421 460974 0 info campbellsci de www campbellsci de India Location Phone Email Website New Delhi DL India...

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