High-Precision Cleanroom Differential Pressure Transmitter | P801

High-Precision Micro-Differential Pressure Monitoring for Critical Environments

The P801 Series is a premium differential pressure transmitter designed for ultra-low pressure ranges where stability, accuracy, and zero-point calibration cannot be compromised. Engineered with advanced variable capacitance sensing technology (SETRA cell), it provides exceptional immunity to thermal drift, making it the ideal solution for cleanroom validation, pharmaceutical facilities, isolation rooms, and high-tech manufacturing.

Key Applications: Cleanrooms, isolation spaces, laboratory hoods, semiconductor fabs, critical HVAC duct static pressure.
Pressure Ranges: Micro-pressures starting from 0 to 25 Pa up to 25 kPa (bidirectional available).
Housing: Rugged, compact IP65 aluminum enclosure for long-term industrial reliability.

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Category: Differential Pressure Transmitters (ΔP)

Description

Engineered for Uncompromising Low-Pressure Accuracy

Monitoring micro-differential pressure in regulated environments demands technology that does not drift over time. Standard piezoresistive sensors often suffer from zero-point instability at low Pascal ranges. The P801 Differential Pressure Transmitter addresses this challenge by utilizing a variable capacitance sensing cell. This high-stability design delivers superior resolution, minimal thermal drift, and immediate response to minute pressure fluctuations across clean space boundaries.

Certified for Regulated Cleanrooms & Critical HVAC

Whether managing positive pressure cascades in pharmaceutical cleanrooms or maintaining negative pressure in medical isolation wards, the P801 provides precise, continuous measurements required for compliance and safety. Its rugged IP65 aluminum housing protects sensitive internal electronics from routine washdowns and decontamination procedures, ensuring uninterrupted operation in strict hygienic zones.

Seamless Automation Integration

Designed for straightforward integration into Building Management Systems (BMS), SCADA, and industrial controllers, the P801 offers standard industrial linear output options (4–20 mA or 0–10 V). Its flexible mounting layout and barb pressure fittings allow for quick installation in filter monitoring racks, air handlers, or flush-mount cleanroom wall panels.

Features

Variable Capacitance Core Tech: Utilizes an ultra-sensitive variable capacitance cell (SETRA technology) for maximum low-pressure stability and minimal long-term drift.
Micro-Pressure Capability: Accurately measures subtle pressure differentials down to 0–25 Pa with high signal-to-noise ratio.
Bi-Directional & Uni-Directional Ranges: Easily configurable for positive, negative, or differential pressure room monitoring (e.g., -50 Pa to +50 Pa or 0 to 100 Pa).
Industrial IP65 Aluminum Enclosure: Heavy-duty cast aluminum housing ensures electromagnetic shielding (EMC/RFI protection) and washdown protection.
High Overpressure Limit: Robust internal diaphragm structure protects the sensor from accidental overpressure surges without losing calibration.
Standard Analog Outputs: Selectable 2-wire 4–20 mA current loop or 3-wire 0–10 V voltage outputs for universal controller compatibility.

Specification

Parameter	Technical Specification
Pressure Medium	Clean, dry, non-corrosive, non-condensing air and gases
Sensing Technology	Variable Capacitance Cell (SETRA Sensor)
Pressure Ranges	0–25 Pa up to 0–25 kPa (Custom & Bidirectional ranges available)
Accuracy Class	±0.25% FS / ±0.5% FS (Includes non-linearity, hysteresis, and repeatability)
Long-Term Stability	≤ 0.1% FS per year
Thermal Zero Drift	≤ ±0.02% FS / °C
Power Supply	18–30 VDC
Output Signals	4–20 mA (2-wire) or 0–10 V (3-wire)
Enclosure Protection	IP65 Die-Cast Aluminum
Process Connections	Barbed fittings for 3/16″ or 1/4″ ID flexible tubing
Operating Temperature	-10°C to +60°C

FAQ

1. Why should I choose a capacitance-based sensor like the P801 over a piezoresistive sensor for cleanrooms?

Capacitance sensors offer vastly superior long-term zero-point stability and extremely low thermal drift at micro-pressures (under 100 Pa). Standard piezoresistive sensors tend to drift over time when measuring tiny pressure changes, requiring frequent re-zeroing to meet pharmaceutical and healthcare regulatory standards.

2. Can the P801 measure bi-directional pressure (positive and negative)?

Yes. The P801 can be configured for bi-directional pressure ranges (such as -50 Pa to +50 Pa). This is ideal for isolation rooms that need to toggle between positive and negative pressurization depending on room usage.

3. What tubing size is recommended for the pressure connections?

The P801 features barbed pressure ports compatible with standard flexible silicone or polyurethane tubing with an internal diameter (ID) of 3/16 inches (4.75 mm) or 1/4 inches (6.35 mm).

4. Is the P801 suitable for measuring liquid pressure?

No. The P801 is specifically engineered for clean, dry, non-corrosive gases and air. For differential pressure measurements in liquids or harsh wet media, please refer to our P803 Stainless Steel Series or P75 Smart Series.

Downloads

High-Precision Cleanroom Differential Pressure Transmitter | P801 – Datasheet