Absolute Pressure Transmitters

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Product Overview

Our Absolute Pressure Transmitters are specifically engineered to measure pressure relative to a perfect vacuum (0 Pa). Unlike gauge pressure transmitters which reference ambient atmospheric pressure, absolute pressure sensors are sealed against a high-vacuum reference chamber, making them immune to changes in barometric pressure. This capability is vital for applications where accurate, altitude-independent pressure measurement is non-negotiable, such as chemical vacuum processes, aviation calibration, and deep vacuum manufacturing.

Key Features

Measures pressure relative to a perfect vacuum (0 Pa).
Unaffected by changes in atmospheric pressure or altitude.
Crucial for vacuum chambers and closed system monitoring.

Technical Specification Sheet

Parameter	Detail
Pressure Range	0 to 1 bar (Absolute) up to 0 to 100 bar (Absolute)
Output Signal	4-20 mA (Standard), Digital protocols optional
Accuracy	±0.1% or ±0.2% F.S.
Wetted Parts Material	Stainless Steel 316L, Hastelloy (Optional)
Process Connection	G1/2, NPT1/2 (Vacuum rated connections available)
Reference Chamber	Sealed high-vacuum reference cell
Temperature Drift	Minimized via electronic compensation

Typical Use Cases

Vacuum Coating/Deposition: Precise pressure control within vacuum chambers.
Food Packaging: Monitoring vacuum sealing processes for quality assurance.
Altitude Simulation: Testing and calibration of aviation equipment.
Distillation & Evaporation: Processes operating under controlled, low-absolute pressure.
Semiconductor Manufacturing: Critical process pressure monitoring in clean rooms.

Competitive Benefits

True Vacuum Reference: Provides consistent, precise readings regardless of the sensor's physical location or weather conditions.
High Precision: Optimized circuitry for measuring fine pressure changes near the zero point.
Robust Sealing: The internal reference cell is permanently sealed, guaranteeing measurement integrity over the instrument's lifetime.
Wide Range: Capable of measuring both deep vacuum and high absolute pressure environments.

Payment and Shipping Details

We require standard payment via T/T or L/C. Shipping is typically arranged using DAP (Delivered at Place) or CIF (Cost, Insurance, Freight). Due to the high-precision reference cell required, the typical lead time is 15-20 days. Each absolute sensor is shipped with a comprehensive factory calibration certificate demonstrating traceability.

Frequently Asked Questions

Q: Why can't I use a gauge pressure transmitter for vacuum processes?
A: A gauge pressure sensor measures relative to the fluctuating atmosphere. If the atmosphere changes, the reading changes. An absolute sensor uses a sealed vacuum, providing a stable, true pressure reading necessary for controlled vacuum processes.

Q: How do I select the correct range for a vacuum application?
A: For a process running near a perfect vacuum, select a range that starts at 0 bar absolute (e.g., 0-1 bar absolute). This provides the highest resolution for the critical vacuum range.

Q: Is the integrity of the vacuum reference cell guaranteed?
A: Yes, the reference cell is hermetically sealed and manufactured under stringent control. Our quality assurance process includes helium leak testing to guarantee the long-term integrity of the sealed vacuum.

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Absolute Pressure Transmitters Manufacturers

Wuxi Huihua Special Instrumentation Co., Ltd. was established in December 2001, the registered capital is 5 million yuan, the existing staff of more than 50 small and medium-sized joint-stock enterprises.
The company specialises in the production of various types of special instruments, alternative to the localisation of imported instruments.To seismic pressure gauge, seismic electric contact pressure gauge, stainless steel pressure gauge, diaphragm corrosion-resistant pressure gauge, marine pressure gauge and other series as the main products. On the basis of field instruments, we have developed various kinds of pressure transmitters, pressure controllers, digital pressure gauges and so on. There are more than 30 series and 3000 specifications. Products are widely used in petroleum, chemical, paper, metallurgy, mining, chemical fibre, electric power, food, environmental protection, rubber and plastic, hydraulics and many other industries, and more than 2,000 domestic customers to establish a friendly relationship with the national large and medium-sized enterprises to establish a good partnership, won the majority of users praise, and set up a corporate brand image.