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Setting up a pressure sensor

Could anyone give me some info on setting up this sensor with the DT800?

Pressure Sensor: 24PCDFA6G from Honeywell
Output Voltage: 0 - 330mv
Sensitivity 11mv / PSI
Input Voltage: 10VDC
http://sensing.honeywell.com/index.php?ci_id=3108&la_id=1&pr_id=5097

It also states that the sensors should be excited by constant current of 2mA. I have tried connecting this to the DT800 using the BGI setup, but am unsure how to set up the excitation bit? Could someone give me some advice on this?

Thanks,
Seanie

Could anyone give me some info on setting up this sensor with the DT800? Pressure Sensor: 24PCDFA6G from Honeywell Output Voltage: 0 - 330mv Sensitivity 11mv / PSI Input Voltage: 10VDC http://sensing.honeywell.com/index.php?ci_id=3108&la_id=1&pr_id=5097 It also states that the sensors should be excited by constant current of 2mA. I have tried connecting this to the DT800 using the BGI setup, but am unsure how to set up the excitation bit? Could someone give me some advice on this? Thanks, Seanie

Good morning Seanie,

The channel option I sets the excitation current. So you code will look some thing like 1BGI(4W,I2)

Cheers,
Roger

Good morning Seanie, The channel option I sets the excitation current. So you code will look some thing like 1BGI(4W,I2) Cheers, Roger

Thanks Roger, I appreciate the help.

I've used this setup and am getting a ppm signal from the DT800 now. I've also been looking at the video tutorials to try to make sense of my data.

The sensor is a differential pressure type so I know my ppm reading (approx -482) when exposed to the same environment can be set as 0 in the scaling, but how do I calculate the upper limit? Here is what I have;

Sensor input = 10Vdc (typical)
Sensor Output = 0 to 35mV (typical)

Scaling;
Physical = 0 to 34.47 millibar
Signal -482 to ??? ppm

Can you help?

Kind Regards,
Seanie

Thanks Roger, I appreciate the help. I've used this setup and am getting a ppm signal from the DT800 now. I've also been looking at the video tutorials to try to make sense of my data. The sensor is a differential pressure type so I know my ppm reading (approx -482) when exposed to the same environment can be set as 0 in the scaling, but how do I calculate the upper limit? Here is what I have; Sensor input = 10Vdc (typical) Sensor Output = 0 to 35mV (typical) Scaling; Physical = 0 to 34.47 millibar Signal -482 to ??? ppm Can you help? Kind Regards, Seanie

Good morning Seanie,

If the sensor input Voltage is 10 VDC and the output is 35 mV then: 35 mV /10 V = 3.5 mV/V. That is the output is 3.5 mV per Volt excitation.

PPM is Parts Per Million and mV per Voltt is Parts Per Thousand (1 mV = 0.001 V) so multiply the mV/V by 1000 and you have PPM. Therefore 3.5 mV / V = 3500 PPM at full scale.

Looking at your first posting you have 11 mV per PSI at 10 VDC. So 11 mV at 10 VDC is 1PSI = 1.1 mV per Volt per PSI= 1100 PPM per PSI. As 1 PSI = 0.06894757 bar = 68.94757 mBar then 1100 PPM = 68.94757 mBar

Now you know the upper limits of your span. Is the output gauge (relative) or absolute pressure? If it read zero output at room pressure then the lower physical is 0 room pressure and the output will be zero pressure at room pressure.

If it is an absolute output then there will be a really big output at room pressure so scale to suit

Cheers,
Roger

Good morning Seanie, If the sensor input Voltage is 10 VDC and the output is 35 mV then: 35 mV /10 V = 3.5 mV/V. That is the output is 3.5 mV per Volt excitation. PPM is Parts Per Million and mV per Voltt is Parts Per Thousand (1 mV = 0.001 V) so multiply the mV/V by 1000 and you have PPM. Therefore 3.5 mV / V = 3500 PPM at full scale. Looking at your first posting you have 11 mV per PSI at 10 VDC. So 11 mV at 10 VDC is 1PSI = 1.1 mV per Volt per PSI= 1100 PPM per PSI. As 1 PSI = 0.06894757 bar = 68.94757 mBar then 1100 PPM = 68.94757 mBar Now you know the upper limits of your span. Is the output gauge (relative) or absolute pressure? If it read zero output at room pressure then the lower physical is 0 room pressure and the output will be zero pressure at room pressure. If it is an absolute output then there will be a really big output at room pressure so scale to suit Cheers, Roger

Thanks Roger,

I forgot to mention in the last post that after some more research, I changed my choice of sensor as I needed much greater sensitivity. The sensor is a differential type. I'll update on how I get on.

Sean

Thanks Roger, I forgot to mention in the last post that after some more research, I changed my choice of sensor as I needed much greater sensitivity. The sensor is a differential type. I'll update on how I get on. Sean
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