Query on MPXx2050/53

[jasperimmanuel]

Below is query from customer regarding below sensors :

MPX2053, 50 kPa Temperature Compensated Pressure Sensors-Product data sheet (nxp.com.cn)

MPXV2050G, 50 kPa Temperature Compensated Pressure Sensors-Product data sheet (nxp.com.cn)

Query :

1. Do these sensors require P1 facing the positive pressure point and P2 to face the vacuum point and based on the pressure difference between P1 and P2 the output is delivered ?

 2. Also, should P1>P2 condition to be maintained ?

3. In our application the pressure sensing port remains the same and it varies from -5 to +5 psi based on the device mode of operation. Do these sensors support pressure sensing in this configuration? 

4. To measure +ve pressure P1 to be connected to the pressure sensing point and P2 left open to ambient, but to sense vacuum on the same pressure sensing point (P1), keeping the P2 at ambient pressure will violate the P1>P2 condition. Is this understanding correct ?

5. Are these sensors support pressure sensing on the liquid media (Saline) or just support only air/gas?

Kindly provide the feedback.

Regards,

Jasper

[reyes · Accepted solution]

Hi Jasper,

Answering the customer questions:

1. Correct, these sensors require P1 facing the positive pressure point and P2 to face the vacuum point and based on the pressure difference between P1 and P2 the output is delivered.

Pressure on P2 can be faced to vacuum, or can be left open to local atmospheric pressure, this port us used as the reference point to measure the pressure versus pressure on Port P1.

What it is important to remember is that pressure on port P1 should always be equal or higher than pressure on Port P2 otherwise the internal mechanical structure of the device will be damaged.

2. Yes, P1>P2 should always be true.

3. No, MPX2050 and MPX2053 should not be used to measure negative pressure, applying negative pressure to the sensor will damaging the mechanical structure of the internal MEMs causing permanent issues on the sensor.

If positive and negative pressure is required to be measured in the same system, I would rather recommend you to use the MPXV7025 sensor: https://www.nxp.com/products/sensors/pressure-sensors/vacuum-sensors-50-to-115-kpa/-25-to-25kpa-diff...

4. Yes, keeping P2 at ambient pressure and measuring vacuum with Port P1 will also violate the P1>P2 condition. MPXV205x should not be used under this condition.

5. These sensor supports only clean dry air. In the application note AN3728 is discussed the media compatibility for the NXP Pressure Sensors.

AN3728: https://www.nxp.com/docs/en/application-note/AN3728.pdf

Regards,

Jose