SJ Gauge low-pressure pressure gauge with iron case

SJ Gauge low-pressure gauge with iron case and vent valve

Low Pressure Gauge, Iron case

Model: PRM

For dry and non-aggressive pressure media, such as gas
External zero adjustment for easy recalibration
Iron- or chromium-plated and stainless steel: PRSM, PRSSM.TU

Responsive after-sales service / Customizable
High quality / One-year warranty
Product images are for reference only. Final specifications are based on the confirmed order.

Description

The PRM is a capsule-type low-pressure gauge designed for measuring dry, non-aggressive gases such as air or nitrogen. It offers measuring ranges from 0–300 mmAq to 0–5000 mmAq, including vacuum and compound options. The case is available in iron or chrome-plated finishes, while the wetted parts use copper alloy. A zero-point adjustment mechanism is included to compensate for long-term drift. Available in 2.5″, 3″, and 4″ dial sizes, the gauge features acrylic or glass windows depending on size. The PRM is ideal for low-pressure ventilation systems, combustion air supply, filter monitoring, and general HVAC duct applications.

Specifications

Connection location	Bottom mount, back mount, center back mount, lower back mount, center back mount with U-clamp, with/without flange
Nominal size	2.5", 3", 4"
Scale ranges	0 … 300 mmAq to 0 … 5000 mmAq, or other equivalent units of pressure, vacuum or compound
Accuracy	ASME B40.1 Grade B ±3/2/3%
Process connection	Chromium - plated copper 1/4, 3/8, 1/2 PT, G, NPT
Case/Ring	Iron 2.5" Bottom mount: Black plating 2.5" Back mount: All chromium-plated case, black iron case, and chromium-plated bayonet ring 3", 4": All chromium plated case
Window	2.5": acrylic 3", 4": glass
Dial	Aluminum alloy, black scale on white
Pointer	Black aluminum alloy
Movement	Copper alloy
Capsule element	Copper alloy
Medium temperature	-20°C ... 60°C
Pressure limitation	Steady: 0.75 x full-scale value Fluctuating: 0.6 x full-scale value