Hi,
Anyone pl, who knows WIRING CONNECTIONS K&Z make pyranomters CMP11 , AND PYREHLIOMETER CHP1 with campbell sci. CR1000 datalogger. pl share.
i m confused with pt100/ thermistor connections on datalogger.
and no manual is given fo the same.
Thanks in advance
Rgupta
Lanco
Hi anyone , Pl rply
I have done some. i need to scare up the wiring. i have it somewhere...if i recall it was just the two wires on the differential channel, but you had to do your own calibration based on the range of the spectrum.
Mike
Intermountain Environmental
www.inmtn.com
Below there are same sample programs about these sensors & CR1000.
'CMP11 Measurement
'------------------
'Connections
'-----------
'Cable Function Channel
'------ --------- -------
'Red Signal(+) 1H
'Blue Signal(-) 1L
'Black Ground Gnd
'sens=4.99microVolt/(W/m2)
'so mult=1000/sens=1000/4.99=200.4
VoltDiff (CMP11,1,AutoRange,1,True ,0,250,200.4,0)
'-------------------------------------------
' PYRHELIOMETER MEASUREMENT
'-------------------------------------------
'CHP-1
'-----
'Connections
'Red --> SE7
'Blue -->SE8
'Shield --> G
'Yellow ---> SE9
'Brown ---> SE10
'Green ---> AG
'Grey ---> NC
'10kOhm resistance for (SE9 & Vx2)
'sensitivity=7.85x10(-6)Volts per W/m2
'So mult=1000/sens so mult=127.388
VoltDiff (Pyrh_Irrad,1,mV25,4,False,0,_60Hz,127.388,0)
If Pyrh_Irrad<0 AND Pyrh_Irrad>-50 Then Pyrh_Irrad=0
'Temp_CHP Measurement
'------------------
BrHalf3W (Rs_Ro,1,mV25,9,Vx2,1,2100,True ,0,_50Hz,100,0)
PRT (Temp_Pyrh,1,Rs_Ro,1.0,0)
I hope this is helpfull
Spyros
Scientific Enterprises Ltd
Greece
Dear Spyros,
I will also connect a CHP1 to a CR1000 and found your post here. It helped a little bit but I don't know whihc you mean with the 10kOhm Resistor between SE9 and Vx2.
Because I don't know which voltage you have porgrammed for Vx2.
Best regards
Daniel
Daniel,
the 10kOhm resistor is used for CHP-1 PT100 measurement for temperature.
From BrHalf3W instruction you can see that i use 2100 mV Excitation.
If you do not need the temperature, do not use it, do not connect yellow & brown cables and do not use 'Temp_CHP Measurement" instructions
Spyros
Thank you a lot.
It works all fine, I had used the wrong SE Channel in the instruction.
Best regards
Daniel
Hello i recently connect a CHP1 to a CR1000 using the reference of mails comments above and i note that the temperature of the CHP1 is always lower than the ambient temperature and datlogger temperature (in example if ambient temperature is 14 degrees celsius CHP1 temperature is 7 degres, if ambient temperature is -2 degress celcius the temperature in the chp1 -6........ and so....
I use a 10 kohm resistance, is not a precision resistance but have low temp coeficient...
The graphics of ambient temperature and CHP1 temperature have the same form and looks coherent but the CHP1 temperature is always below the ambient temperature.
My question is is normal to have lower temperature readings in the CHP1??
Thank you
Best Regards
The answer is no, not by 7 C. The two likely issues are:
a) the 10k resistor you are using is not good enough. Every 1% error in that resistor will equate to about a 3 deg C error in temperature.
b) that your wiring is breaking the assumptions of 3-wire measurements (which tries to compensate for errors caused by the connecting wires). One common error is connect the Grey and Green wires together (for this sensor)which halves the resistance in one wire. The Grey wire should not be connected at all. There are other possible wiring errors that could cause this.
Understood
Thank you i will cheq for the cable connections, i think the grey cable is connected.
Best Regards
This post is under review.