Measuring Natural Gas Pressure

Any hardware type questions or problems for all other Phidget devices.
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Measuring Natural Gas Pressure

Postby james211 » Thu Mar 22, 2018 2:08 pm

Its been brought to my attention that natural gas pressure can be measured with software and the use of a phidget. Here are the requirements. What I don't know is where to find a sensor that might work. The pressure I'd be measuring would be quite low, 0.1 - 0.2 psi. If anyone has any recommendations I'd appreciate it.

From the support site of the software I'm using:

Gas pressure will always be measured as a percentage. We do not support other units, as conversion between them is error-prone. Using percentage rather than other units is also in-line with our existing strategy for Giesen, Loring and Coffeetool.

This is a list of specifications that a gas pressure meter must adhere to, in order to get the best results in conjunction with Phidgets boards.

Pressure meter with an output range from 0-5V (preferred) or 4-20mA.
The output of the pressure meter must be calibratable. e.g. if the meter measures from 0-4 bar and the pressure from the roaster is 0-2 bar we must be able to set the input maximum on the pressure meter on 2 bar. Note: If this is not possible, it means that the RI will show incorrect values if the max/min value can't be reached)
The pressure output signal is expected to be between 0 and 100%. In the above example 0 bar is 0% and that 2 bar is 100%.
If the pressure meter outputs Volts (0-5V), one can connect it directly to a Phidgets 1018 or Phidget 1019 via a 3-pin 30XX sensor cable (XX means that there are different length available).
If the pressure meter outputs Milli-Ampere (4-20mA), one needs a Phidgets 1018 or Phidget 1019 as well as a Phidget 1132 (there is also an acrylic enclosure available).
There are active and passive 4-20mA loops. Which defines the physical location of the ground. Please refer to the the Phidgets 4-20mA Interface Primer which contains wiring diagrams.
0-5 V Setup.jpg
0-5v Setup
4-20 mA Setup.jpg
4-20mA Setup

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