topic Re: Seeking a compatible pressure sensor in Sensors

Seeking a compatible pressure sensor

chinabme — Tue, 03 Feb 2026 23:39:36 GMT

Hallo everyone

I'm looking for a compatible pressure sensor to replace the original 125pc05d1.

125pc05d1 is the original pressure sensor.It is a differential pressure type.

I have attached the original pressure sensor's outline drawing and technical specifications.

The sensitivity of a 125pc05d1 is approximately equal to Δmv/Δp ≈ 70mv/5psi ≈ 14,Because the subsequent amplifier circuit is complex, I don't know how to adjust it. It would be ideal if there were a newer model of pressure sensor with the same sensitivity that would be compatible.

For more detailed testing, please see the link below.

https://www.eevblog.com/forum/repair/replacing-the-pressure-sensor-requires-assistance/

Thank you for your help.

Re: Seeking a compatible pressure sensor

TomasVaverka — Wed, 24 Dec 2025 14:33:54 GMT

Hello,

Please consider using the MPX10DP, as it is the closest match to the original 125pc05d1 in both form and functionality. If you need a broader pressure range or more output voltage for higher resolution, consider the MPX5010DP, albeit with additional signal conditioning.

BRs, Tomas

Re: Seeking a compatible pressure sensor

chinabme — Thu, 25 Dec 2025 09:53:50 GMT

Thanks

Re: Seeking a compatible pressure sensor

chinabme — Mon, 05 Jan 2026 11:18:55 GMT

Hallo

My original pressure sensor signal modulation board worked stably with the 125PC05D1 pressure sensor. If I replace it with an MPX10DP, how should I modify it? Or would it be more appropriate to redesign the signal modulation board?

For example, the sensor power supply voltage is provided by REF01, and it uses a constant current source compensation method.

The sensor operates at around 9V, which is much higher than the normal operating voltage of the MPX10DP.

The actual flow rate corresponding to the pressure difference test is shown in the Excel data.

Re: Seeking a compatible pressure sensor

chinabme — Mon, 05 Jan 2026 11:31:38 GMT

The link below contains the technical specifications for this host unit; the corresponding module is RT-203M.The maximum traffic flow is 180 liters per minute.

This refers to the maximum flow rate and pressure differential corresponding to the original 125PC05D1. For other performance parameters, please refer to the manual.

https://archive.org/details/manual_Timeter_RT-200_Calibration_Analyzer_Operator_and_Service_Manual

Re: Seeking a compatible pressure sensor

chinabme — Mon, 05 Jan 2026 11:42:40 GMT

RT-203M