MEMS Pressure Sensor | Piezoresistive (Gauge/Absolute/ΔP)
Winsen’s piezoresistive MEMS portfolio spans board-level sensors and rugged transmitters. Measure gauge, absolute and differential (ΔP) pressure—from barometric 300–1100 hPa and Pascals-level ΔP up to 25 bar process lines—with outputs tailored for embedded controllers or PLC/BMS.
OEM/ODM • Private labeling • Fast lead time
- Pascals → 25 bar scalable ranges
- 0.5–4.5 V / I²C board-level
- 0–10 V / 4–20 mA industrial transmitters
- Gauge / Abs / ΔP measurement modes
Overview & Working Principle
Our MEMS sensors use a diffused-silicon piezoresistive diaphragm forming a Wheatstone bridge. Pressure-induced strain changes bridge resistance and the ASIC provides a temperature-compensated, linear output. For liquids or harsh gases, the die is oil-filled and isolated behind an SS316L diaphragm (WPCK series).
Pressure Sensor and Transmitter Comparison Overview
| Category | Model | Power Supply / Output | Detection Range | Accuracy / Nonlinearity | Pressure Reference | Operating Temperature | Shell Material | Remarks |
| Diffused Silicon Pressure Sensor | WPAK70 | 1.5mA / mV | -100kPa ~ 0 ~ 10kPa…10MPa | ≤±0.3%FS | Gauge / Absolute / Sealed Gauge | -40℃ ~ 120℃ | – | High versatility, compact design |
| WPAK69 | 1.5mA / mV | -100kPa ~ 0 ~ 10kPa…10MPa | ≤±0.3%FS | Gauge / Absolute / Sealed Gauge | -40℃ ~ 120℃ | – | Similar to WPAK70 | |
| WPAK68 | 1.5mA / mV | -100kPa ~ 0 ~ 10kPa…100MPa | ≤±0.3%FS | Gauge / Absolute / Sealed Gauge | -40℃ ~ 120℃ | – | Extended range version | |
| WPAK67 | 1.5mA / mV | 0 ~ 10kPa…2.5MPa | ≤±0.3%FS | Differential Pressure | -40℃ ~ 120℃ | – | For differential applications | |
| WPAK66 | 1.5mA or 10V / mV | 6MPa…60MPa | ≤±0.3%FS | Sealed Gauge | -40℃ ~ 120℃ | – | Sealed design for higher ranges | |
| WPAK65 | 1.5mA or 10V / mV | -100kPa ~ 0 ~ 10kPa…16MPa | ≤±0.3%FS | Gauge / Absolute / Sealed Gauge | -40℃ ~ 120℃ | – | General-purpose sensor | |
| WPAK64 | 1.5mA or 10V / mV | -100kPa ~ 0 ~ 10kPa…25MPa | ≤±0.3%FS | Gauge / Absolute / Sealed Gauge | -40℃ ~ 120℃ | – | Moderate range coverage | |
| WPAK63J | 1.5mA / mV | -100kPa ~ 0 ~ 10kPa…100MPa | ≤±0.3%FS | Gauge / Absolute / Sealed Gauge | -40℃ ~ 120℃ | – | J-type version for special mounting | |
| WPAK63 | 1.5mA or 10V / mV | -100kPa ~ 0 ~ 10kPa…100MPa | ≤±0.3%FS | Gauge / Absolute / Sealed Gauge | -40℃ ~ 120℃ | – | Versatile with wide range | |
| Ceramic Pressure Sensor | WPAH01 | 2–20V / mV | 0 ~ 200kPa…40MPa | ≤±0.3%FS | – | -40℃ ~ 125℃ | – | High chemical resistance |
| Plastic Sealed Pressure Sensor | WPAS12 | Digital and analog | 15–115kPa | – | – | -40℃ ~ 125℃ | – | Cost-effective, compact |
| WPAS02 | Digital and analog | 10kPa ~ 100kPa | – | – | -20℃ ~ 80℃ | – | Basic sensor for air/gas | |
| WPAS01 | Digital and analog | 10kPa ~ 100kPa | – | – | -40℃ ~ 125℃ | – | Robust high-temp tolerance | |
| Diffused Silicon Pressure Transmitter | WPCK81 | 4–20mA, RS485 | 0 ~ 1m…200mH₂O | ±0.5%FS / ±1%FS | Gauge Pressure | – | Stainless steel | For deep-level and tank level measurements |
| WPCK62 | 4–20mA (Optional) | 0 ~ 35kPa…25MPa | ±0.5%FS | Gauge / Absolute / Sealed Gauge | – | Stainless steel | Widely compatible, thread options | |
| WPCK08 | 4–20mA, RS485 | 0 ~ 200mH₂O | ±0.5%FS | Gauge Pressure | – | Stainless steel | Explosion-proof version | |
| WPCK07 | 4–20mA, 0.5–4.5V, 0–5V, 1–5V, 0–10V, 1–10V | -100kPa ~ 0 ~ 10kPa…100MPa | ±0.5%FS | Gauge / Absolute / Sealed Gauge | – | Stainless steel | Full-range output types | |
| WPCK05 | 0.5–4.5V, 0–5V, 1–5V, 0–10V, 1–10V | -100kPa ~ 0 ~ 10kPa…100MPa | ±0.5%FS | Gauge / Absolute / Sealed Gauge | – | Stainless steel | Voltage output options | |
| WPCK03 | I²C, 4–20mA, 0.5–4.5V and more | -100kPa ~ 0 ~ 10kPa…100MPa | ±0.2%FS, ±0.5%FS (custom) | Gauge / Absolute / Sealed Gauge | – | Stainless steel | Flexible signal types, high accuracy | |
| Ceramic Pressure Transmitter | WPCH04 | 0.5–4.5V (Customizable) | 0.2MPa…40MPa | 0.1%FS (Default) | – | – | Stainless steel | High precision ceramic core |
| WPCH01 | 4–20mA, 0/1–5/10V, 0.5–4.5V | 0.2–5MPa | 0.1% ~ 5.0%FS (Default 2.0%) | – | – | Stainless steel | Customizable, versatile outputs | |
| WPBH01 | Proportional voltage (0.5–4.5V) | 2–400 bar (Customizable) | 0.5%, 1%, 2% (Default), 3% | – | – | Stainless steel | Broad pressure range | |
| Glass Micro-Fusing Transmitter | WPCK89 | Digital and analog | 0 ~ 100 / 150 / 250 / 500 psig | ±1%FS | – | – | Stainless steel | Extremely robust and thermally stable |
Selection Guide
| Use Case | Mode & Range | Recommended Model | Output | Notes |
|---|---|---|---|---|
| Weather/altitude reference | Absolute 300–1100 hPa | WPAS01 | 0.5–4.5 V | Calibrate at site altitude; average samples for stability. |
| Cleanroom & HVAC duct static | ΔP ±25…±1000 Pa | WPAK67 | 0–10 V / 4–20 mA / I²C | Equal-length tubing; enable averaging 0.5–3 s. |
| Pneumatics & compressors | Gauge 0–10/16 bar | WPCK07 / WPCK05 | 4–20 mA / 0–10 V | Add snubber for pulsation; shielded cable on long runs. |
| Water/RO skids & building loops | Gauge 0–6/10/16 bar | WPCK62 | 0–10 V / 4–20 mA | Panel-friendly; select seals for temperature and medium. |
| OEM smart gauge/head | Gauge 0–10/16 bar (core) | WPAK66 | 0.5–4.5 V (board) | Add your ADC/display; private labeling available. |
Threads: G1/4, 1/4-NPT, M14×1.5; Electrical: M12, DIN, Deutsch/Packard, pigtail (per model).
Applications & Industries
HVAC & Cleanrooms
Duct static, room pressurization, filter status and VAV control using ΔP cores/transducers.
Pneumatics & Compressors
Manifolds, regulator monitoring, leak and energy programs in plant air systems.
Water & Process Lines
RO/UF skids, building water loops, boiler auxiliaries with isolated SS316L transmitters.
Instruments & Test Benches
Fast response channels for labs and OEM devices; ratiometric or 0–10 V outputs.
Weather & Altitude
Barometric reference in stations, drones and environmental compensation channels.
OEM Smart Gauges
Private-label gauge heads built on WPAK66/64 with your display and enclosure.
Why Global Clients Choose Us?
The company consistently adheres to the quality policy of “Fine Craftsmanship, Scientific Innovation, Pursuit of Excellence, and Value-Added Service.” By formulating production process control plans and work instructions, it has established a standardized, accountable, and regulated process management system. Additionally, the company has independently developed an MES production management system, enabling comprehensive and visual management across the entire workflow.
30+ YEARS OF EXPERIENCE
R&D, manufacture and sales of sensors and sensing solutions.
QUALITY GUARANTEE CONTINOUS IMPROVEMENT
Complete and rigid process flow control, coupled with significant improvements.
INTERNATIONAL MARKET
Deliver sensing products to more than 100 countries and regions.
STABLE SUPPLY CHAIN RELIABLE PRODUCTION
Core components not subject to constraints, advanced equipments for manufaturing and test.
R&D STRENGTH TECHNOLOGY INNOVATION
200+ patents, 180+ R&D team members, self-built labs for continous innovation.
ONE-STOP SERVICE
Professional consultation, fast delivery, 24 hours after-sales support.
Leading the Industry, Innovative & Controllable Technology
With robust R&D capabilities, we maintain sustained input in R&D and unwavering commitment to technological innovation. This not only ensures that we remain at the forefront of industry but also drives continuous innovation, leading the future trend of the sensing industry.
Integration & Installation
Board-level (0.5–4.5 V/I²C): Use a stable 5 V supply, short traces to ADC, and good ground. Average samples (e.g., moving average) to reduce vibration noise.
Transmitters (0–10 V / 4–20 mA): 12–36 V supply; shielded cable; ground at one end; 4–20 mA preferred for long/noisy runs. Add a snubber for pulsation.
- Vent gauge sensors correctly; avoid trapped pressure.
- For ΔP, keep tubes equal length; add hydrophobic filters/drip loops.
- Confirm overload/burst vs. transients (water hammer, compressor ripple).
Ordering & Bulk Purchasing
How to Specify
- Mode & range (Gauge/Absolute/ΔP; units & span)
- Output (0.5–4.5 V, I²C, 0–10 V, 4–20 mA)
- Medium & temperature (air, water, process)
- Process connection (G1/4, 1/4-NPT, M14×1.5, barbed, manifold)
- Electrical interface (M12, DIN, Deutsch/Packard, pigtail, board)
- Docs required (test report, calibration certificate, labeling)
Program Terms
- Samples for validation
- Tiered pricing for volume schedules
- Private labeling & custom packaging
- Rolling forecast & safety stock options
Differential Pressure Sensor vs Transducer vs Transmitter
| Device | Output | Typical Use | Pros | Considerations |
|---|---|---|---|---|
| ΔP Sensor (board/compact) | Ratiometric / I²C / SPI | Embedded devices, instruments | Small, low-power, cost-effective | Requires host electronics and enclosure |
| ΔP Transducer | 0–10 V / 4–20 mA | PLC/DAQ measurement | Simple wiring, long cable runs | External display/relays not included |
| ΔP Transmitter | Conditioned + enclosure (often display/relays) | Field installation, panel mount | Rugged, installer-friendly | Largest size and highest cost |
Not sure which to choose? Share your controller model and mounting location—we’ll recommend the right package.
Frequently Asked Questions (FAQ)
What is a MEMS (piezoresistive) pressure sensor?
A silicon diaphragm with diffused resistors forms a Wheatstone bridge. Pressure changes resistance; the ASIC outputs a temperature-compensated, linear signal.
When should I choose gauge vs absolute vs differential?
Gauge for lines/tanks, absolute for barometric/altitude/reference, differential for ΔP across ducts, filters and flow elements.
Can MEMS measure liquids safely?
Yes—use isolated, oil-filled transmitters (WPCK series) that protect the die behind an SS316L diaphragm.
Which output suits my controller?
0.5–4.5 V or I²C for embedded devices; 0–10 V/4–20 mA for PLC/BMS. Choose 4–20 mA for long/noisy runs.
How to deal with pulsation and surges?
Add a snubber/restrictor, mount away from hammer sources, and verify overload/burst ratings vs. peak spikes.
Do you provide calibration documentation?
Yes—test reports are standard; calibration certificates and serialized labels are available on request.
