Sailsors A2DU Differential Pressure Gauge

With output signal

Range: 30 Pa – 30 kPa
Accuracy: up to ±2.5% Full Scale
Compliance: CE, RoHS, ISO 9001

1. Product Overview

The A2 Series Differential Pressure Gauge is a low-pressure mechanical gauge designed for air and non-corrosive gases. It uses a magnet-helix movement to deliver stable, drift-free indication, especially suitable for very low differential pressure measurement.

2. Key Features

Magnet-helix indicating mechanism for low DP measurement
Wide range coverage: 0–30 Pa up to 0–30 kPa
High accuracy:
- Standard: ±2% FS
- Some low-range models: ±3% to ±4% FS
Inertia-free, drift-free pointer movement
Multiple unit options (Pa, inH₂O, mmH₂O, cmH₂O, kPa, psi)
Zero-center and dual-scale versions available
OEM / customized solutions supported

3. Indicating Mechanism (Working Principle)

Pressure is applied to both sides of a diaphragm.
Any pressure difference moves the diaphragm and linked spring.
A magnet attached to the spring rotates a magnetic helix.
The pointer fixed to the helix turns proportionally to the pressure difference.
No mechanical gear contact → high stability & long life

4. Applications

HVAC system monitoring
Filter condition and clogging detection
Fan and blower pressure measurement
Air velocity measurement
Orifice plate pressure drop
Cleanroom monitoring
Pharmaceutical & semiconductor manufacturing
General low-pressure air & gas measurement

5. Technical Specifications

Media

Air and non-combustible, compatible gases

Accuracy

±2% FS @ 21 °C (standard)
±3% FS on selected low ranges
±4% FS on ultra-low ranges (e.g. 0–0.25 inH₂O, 0–6 mmH₂O)

Ambient Temperature

–7 °C to +60 °C

Pressure Limits

Operating pressure limit: –68 to 100 kPa
Overpressure protection:
- Relief plug opens at approx. 15 psig (100 kPa)

Process Connection

1/8″ female NPT
Duplicate high & low pressure ports
(one pair on side, one pair on back)

Mechanical

Case & bezel: Die-cast aluminum
Dial size: 4 inch (≈100 mm)
Mounting position: Vertical
Weight: ≈460 g

Standard Accessories

Two 1/8″ NPT plugs
Two 1/8″ pipe-to-rubber tubing adapters
Three flush-mounting adapters with screws

6. Measurement Ranges & Model Selection

A. Inch Water Column (inH₂O)

Standard Ranges

0–0.25 | 0–0.5 | 0–1 | 0–2 | 0–3 | 0–4 | 0–5 | 0–6
0–8 | 0–10 | 0–15 | 0–20 | 0–25 | 0–30 | 0–40 | 0–50 | 0–60 | 0–80 | 0–100 | 0–150

Zero-Center (±)

±0.25 | ±0.5 | ±1 | ±2 | ±5 | ±10 | ±15

B. Pascal (Pa)

0–30 | 0–60 | 0–100 | 0–125 | 0–250 | 0–300 | 0–500 | 0–750 Pa

Zero-Center Pa

±125 Pa | ±250 Pa | ±0.5 kPa | ±1.5 kPa

C. mmH₂O

0–6 | 0–10 | 0–25 | 0–50 | 0–80 | 0–100 mmH₂O

Zero-Center

±10 mmH₂O

D. cmH₂O

0–15 | 0–20 | 0–25 | 0–50 | 0–80 | 0–100 | 0–150 | 0–200 | 0–250 | 0–300 cmH₂O