Martyn wrote:I would expect the output, pin 3, to be connected to the terminal board not the power supply pin.
Martyn wrote:How are you powering the pressure transducer ?
PeterF wrote:If you are using the PTX1400 sensor which is a two pin, 4-20mA device, then you need the following connections and settings:-
A power supply for the sensor of at least +15V DC & up to +28V DC.
Connect the +Ve output of the PSU to pin 1 of the sensor.
Connect pin 2 of the sensor to the "4-20mA/5V" terminal of the SCTB.
Set the "4-20mA" switch of the SCTB to "ON".
Connect the "COM" terminal of the SCTB to the -Ve terminal of the PSU. That completes the current loop.
PeterF wrote:The 4-20mA will flow through a load resistor on the adapter board, generating between 9.6mV (@4mA) and 48mV (20mA). To convert these voltages into properly scaled readings, you must use the "Scaling" option in PicoLog. If the output of the sensor is 0% at 4mA & 100% at 20mA, you would set up a look-up table to equate 9.6(mV) to 0(%) & 48(mV) to 100(%).
When in the "TC-08 Measurements" dialog box, click "Edit" for the channel in question.
In the "Edit TC-08 measurement" box, click "Options"
In the "Parameter options" box, tick "Use Parameter Formatting" and set "Units" to "%", "Formatting" to your own preference and then click "Scaling"
In the "Parameter Scaling" box, set "Scaling method" to "Table look-up".
In the blank box, you can now enter pairs of "Raw" & "Scaled" readings. In this case the table looks like:-
(Note the "Space" between the numbers on each line)
Instead of "%", you can substitute the engineering units of your sensor, if you wish.
PeterF wrote:Firstly, we need to positively identify the operating pressure range of the sensor. Is it "Relative" or "Absolute" pressure and what is the full scale?
Relative pressure sensor would be:-
0 mbar at ambient pressure
-1000 mbar at full vacuum
Absolute pressure sensor would be:-
0 mbar at a full vacuum
+1000 mbar at ambient pressure
PeterF wrote:I will need to know at what pressure the sensor will output 4mA and at what pressure it will output 20mA.
(I can also find that out if you give me the full sensor part number)
With the sensor information I can give you the full settings for PicoLog.
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