Hello, I'm newbie but I want to learn and finish my project.
Well, firstly.. I'm reading the manual of CR1000, because I have or I can use the datalogger CR1000 for my researching, but I know something about electronics (the basic only).
Before using the CR1000 and connect with the PT100, I'm reading about of how I can do it.
I'm read the manual, but doesn't said nothing about the case of Pt100 (2 wire).
How I can connect my Pt100 with CR1000?
or maybe someone have a manual or example for my case, please.
Thanks a lot.
Refer to the manual for the 4WPB100 found on this website.
The 4WPB100 and 4WPB1K have precision completion resistors inside them to complete the circuit. Without the terminal modules, you can acquire precision resistors yourself and wire them up using the circuit diagram in the manual. It is extremely important to use precision resistors with low temperature coefficients. Low quality resistors will cause errors that make PT100 measurements unuseable.
Thanks JDvais, but if I want to try to use "BRHALF", but my Pt100 has (as http://goo.gl/ZPglM7):
Measurement range of -20°C to +150°C
Tolerance ± 0.8°C (range of -20°C to +100°C)
But I will use the Pt100 in a range of 0 to 50°C, only (because I will use the sensor to read the temperature of a pv module) and temperature range of 14 to 40°C, but with 0 to 50°C its good.
So,
T = 0 to 50°C
The resistance of the PRT is approximately 119.7 ohms at 50°C. So readin about the example for PT100 3wires I have.
ExmV = 2200 or Can I use 2500?
So, its right? Using a Rf = 120 ohm
Dest = Destination
Reps = 1
Range = Autorange or mV25
SEChan = 1 (1 to 16)
Vx/ExChan = Vx1
MeasPEx = 1
ExmV = 2500
RevEx = True
SettlingTime = 0
Integ = 250
Mult = 1.0
Offset = 0
BrHalf(Dest, Reps, Range, SEChan, Vx/ExChan, MeasPEx, ExmV, RevEx, SettlingTime, Integ, Mult, Offset)
Later to finish
ValuePT100=Rf*ABS(Destination/(1-Destination))
I don't know if is correct.
Thanks
PD: Sorry, but if I have a Pt1000 and not a Pt100 Only I can changed the Rf or..?, but I don't need to read with accurately.. T = X,X... (e.g. 25.2°C)
* Last updated by: cosuroca on 10/8/2014 @ 1:01 PM *
As mentioned in the other post you referred to, a larger value of fixed resistor should be used to reduce self heating of the probe.If electrical noise is not a problem, you can actually use a lower excitation voltage to further reduce self heating.
If you are using a PT1000, the nominal resistance of the probe is 1000 ohms, and you should use a fixed resistor of 1k Ohm or 10kOhm.
You are using the correct calculation to get the resistance of the PT1000. To convert to a temperature, use the PRTcalc instruction. R0 for a PT1000 is 1000 Ohms.
Thanks a lot JDavis :D