MDM291 Differential pressure sensor
Differential pressure sensor with fully welded stainless steel design and 20 MPa static pressure resistance.
Key features
- Differential pressure range: 0.35 bar to 20 bar
- Fully welded structure — no o-rings
- Static pressure resistance: up to 200 bar (20 MPa)
- Output: 70 mV (typical) bridge signal
- Long-term stability: ±0.3 to ±0.5%FS/year
- High corrosion resistance with SS316L
- Compact OEM design with silicone oil-filled isolation
About the MDM291 Welded differential pressure sensor module
The MDM291 is a welded differential pressure sensor designed for OEM integration. Its stainless steel 316L diaphragms and fully welded construction make it ideal for applications requiring compatibility with aggressive, conductive, or high-pressure fluids. By isolating both high and low-pressure sides and transmitting differential pressure via silicone oil to a piezoresistive sensor die, the sensor delivers stable, accurate readings without deformation.
Usage conditions
This sensor operates in harsh conditions with a wide working temperature range of -40°C to +125°C and a compensated range of 0°C to +70°C. The unit tolerates high vibration (10g RMS) and shock (100g, 11ms), making it suitable for challenging industrial environments.
Possible applications
- Flow measurement (Venturi, vortex)
- Gas and liquid differential monitoring
- Pressure calibration systems
- HVAC differential control
- Process automation and control systems
Advantages of choosing this product
The MDM291 offers a leak-proof, o-ring-free design that increases durability and chemical resistance. With high interchangeability, robust output, and a compact design (Ø19 mm), it's ideal for differential measurement systems where reliability and space efficiency matter.
Other important features
- Electrical output: 70 mV DC
- Input impedance: 2–8 kΩ | Output impedance: 3.5–6 kΩ
- Thermal error (zero/span): ±0.75% to ±1.0%FS at 35°C
- Electrical connection: 100 mm flexible silicone wires
- Threaded pressure ports (G1/4, G1/2, M20x1.5, etc.)
- Sealing options: EPDM, FKM, FVMQ or welded ends
Do you need this sensor for your next project?
Request a no-obligation quote or send us your contact details for a free, no-obligation consultation. Our sales engineers will then contact you within a maximum of 1 to 2 working days.
Product downloads
Talk to our experts
Not exactly what you are looking for? We offer standard sensors, but can also help you with sensors adapted for you or a fully customised measurement solution. Contact us for advice or pricing.
Talk to an expertTechnical Specifications
Specification | Value |
---|---|
Pressure nonlinearity | ±0.15, MAX ±0.25 %FS,BFSL |
Pressure repeatability | ±0.05, MAX ±0.075 %FS |
Pressure hysteresis | ±0.05, ±0.075 %FS |
Zero output | ±2.0 mV DC |
Output/Span | MIN 70 mV DC |
Zero thermal error | ±0.75, MAX ±1.0 %FS, @35℃ |
Span thermal error | ±0.75, MAX ±1.0 %FS, @35℃ |
Compensation temp. range | 0 ~ 70 ℃ |
Operating temp. range | -40~125 ℃ |
Storage temp. range | -40~125 ℃ |
Long-term stability error | ±0.3, MAX ±0.5 %FS/Year |
Related products
Need something else?

MDM290 Differential pressure sensor module
- OEM sensor for differential pressure
- High static pressure up to 200 bar
- Compact, reliable and media-isolated

MPM489 ATEX pressure transmitter
- Intrinsically safe & Ex-proof versions
- Pressure range up to 1000 bar
- Stainless steel housing