Differential Pressure Transducer | Low-Range ΔP for HVAC & Cleanrooms | Winsen
Winsen supplies low-range differential pressure (ΔP) transducers designed for HVAC, cleanrooms, filter status, fume hoods, VAV boxes, and process diagnostics. Built on a stable MEMS core with precision temperature compensation, our ΔP devices deliver linear, low-noise signals via 4–20 mA, 0–10 V, ratiometric 0.5–4.5 V, or I²C outputs.
OEM/ODM • Private labeling • Fast lead time
- ±25 Pa → ±100 kPa bidirectional ranges
- ±0.25%FS typ. accuracy options
- 4–20 mA / 0–10 V / I²C easy integration
- Zero/Span field calibration
Overview & Working Principle
A differential pressure transducer measures the pressure difference between two ports (High/Low). The sensing diaphragm deflects with ΔP, and the signal-conditioning ASIC converts it into a calibrated electrical signal. Bidirectional variants read both positive and negative pressure relative to the low port—ideal for room pressurization and airflow elements.
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 | Recommended Range | Preferred Output | Ports & Electrical | Notes |
|---|---|---|---|---|
| Cleanroom pressurization | ±25…±250 Pa | 0–10 V or I²C | Barbed 4–6 mm; JST/Molex | Enable averaging to reduce door-opening spikes. |
| Filter status (AHU) | ±250 Pa…±2 kPa | 4–20 mA | Barbed ports; M12/DIN via harness | Best for long runs and noisy plant rooms. |
| VAV & duct airflow | ±50 Pa…±1 kPa | 0.5–4.5 V or I²C | Board-level or compact module | Pair with flow element; use median filtering. |
| Fume hood face velocity | ±50…±500 Pa | 0–10 V | Barbed; shielded cable | Auto-zero at start with both ports to ambient. |
| Process orifice/flow | ±2…±100 kPa | 4–20 mA | Isolated adapters available | Check static pressure and media compatibility. |
Need RS-485/Modbus or a display? Choose the transmitter package or request a custom electronics stack.
Key Specifications
| Measurement | Bidirectional differential (High–Low) or unidirectional |
|---|---|
| Ranges | ±25 Pa → ±100 kPa (custom on request) |
| Outputs | 4–20 mA (2-wire), 0–10 V / 0–5 V, 0.5–4.5 V ratiometric, I²C |
| Accuracy (typ.) | ±0.25%FS (options per range) |
| Stability | ±0.2%FS/year typical |
| Response | 2–10 ms (digital filtering configurable) |
| Comp. Temp | −10…85 °C (options wider) |
| Operating Temp | −20…85 °C air (consult liquid models) |
| Overload / Burst | 2× / 5× FS typical (per model) |
| Ports | Barbed 4–6 mm, M5, 1/8-NPT, manifold/custom |
| Electrical | JST/Molex headers, cable pigtail, M12 via harness |
| Protection | Reverse polarity; optional hydrophobic filter; IP-rated housings via transmitter |
Applications & Industries
HVAC & Building Controls
Room pressurization (positive/negative), stairwell pressurization, AHU filter status, VAV control.
Healthcare & Cleanrooms
ISO/GMP suites and isolation rooms with continuous ΔP monitoring and alarm relays.
Process & Instruments
Orifice ΔP for flow, blower monitoring, burner air control, leak and blockage diagnostics.
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 & Wiring
4–20 mA (2-wire): Best for long cables and noisy environments; 12–36 VDC loop power with proper loop impedance.
0–10 V / 0–5 V: Simple panel-meter/DAQ hookup; use high-impedance input (>10 kΩ) and clean supply.
Ratiometric / I²C: For embedded devices; short leads, stable 5 V, pull-ups on I²C, and cable shielding recommended.
Example: 0–10 V to PLC +24V ── Sensor V+ PLC AI (0–10V) ── Sensor Vout GND ── Sensor GND PLC GND ───────── Sensor GND H Port ← High side L Port ← Low side (reference)
Pinouts vary by connector (JST/Molex/M12/DIN). Refer to the product datasheet for orientation and wiring.
Ordering & Bulk Purchasing
How to Specify
- Range & units (e.g., ±50 Pa, ±500 Pa, ±2 kPa, ±100 kPa)
- Output (4–20 mA, 0–10 V, 0.5–4.5 V, I²C)
- Ports (barbed size, M5, 1/8-NPT, manifold)
- Connector (JST/Molex, cable pigtail, M12 via harness)
- Environment (temperature, condensation, vibration)
- Calibration (zero/span points, filter constants)
Program Terms
- Samples for DFM and validation
- Tiered pricing for volume schedules
- Private labeling & custom packaging
- Rolling forecasts with 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)
How do I perform on-site zeroing?
Power up and allow 1–5 minutes warm-up. Vent both ports to ambient (tubes off or both open), then press the ZERO key or use the software command. For analog units, trim to 0 V or 4 mA with both ports vented.
How should I route the tubing for best accuracy?
Keep H/L tubes equal length, avoid kinks, and mount ports level. Use short runs for faster dynamics and add hydrophobic filters or drip loops to keep moisture out.
Will long tubing slow the response?
Yes—added volume and friction create damping. Shorten lines or increase ID for quicker response, and apply 0.5–3 s averaging to stabilize HVAC readings.
What is the static pressure rating vs. the ΔP range?
ΔP range is the measurable difference; static pressure is the absolute pressure present on both ports. Verify the sensor’s maximum static rating exceeds your duct or process static pressure.
How does temperature affect accuracy?
Sensors are temperature-compensated, but residual error remains. Install away from heat sources, allow warm-up, and request multi-point calibration over your operating band if needed.
What calibration interval do you recommend?
Commonly 12 months for HVAC/cleanrooms; 6 months for critical processes. We can provide certificates and help align intervals with your QA procedures.
