MDM291 Differential pressure sensor

---

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

---