Product Description
Intrinsically Safe Low-Pressure Digital Manometer for HVAC & Gas Diagnostics
The Series 475-000-FM Handheld Digital Manometer is engineered for ultra-low differential pressure measurement in hazardous environments, delivering accurate readings from 0–1.000 in. w.c. (0–0.2491 kPa) with FM intrinsic-safety approval.
Designed for technicians working around natural gas systems, boilers, and confined HVAC spaces, this unit measures positive, negative, or differential pressure while remaining compact and rugged for daily field use. Dual front push-pads simplify zeroing, power control, and unit selection without setup delays.
When paired with a compatible pitot tube, the instrument also functions as an air-velocity gage, expanding its usefulness for commissioning and troubleshooting airflow systems.
Key Performance Advantages
-
Ultra-low pressure dual-range capability
-
FM-approved for hazardous locations (Class I, Div 2)
-
±0.5% full-scale accuracy
-
Compact aluminum housing
-
Simple push-button operation
-
Air-velocity capable with pitot tube
Typical Applications
-
HVAC static pressure diagnostics
-
Natural-gas equipment monitoring
-
Field calibration of pressure instruments
-
Combustion system testing
-
Confined-space troubleshooting
Technical Specifications
Pressure Range: 0–1.000 in. w.c. (0–0.2491 kPa)
Maximum Pressure: 5 psig
Accuracy: ±0.5% FS (60–78°F); ±1.5% FS outside range
Pressure Hysteresis: ±0.1% FS
Display: 0.42 in. 4-digit LCD
Temperature Limits: 0–140°F (-17.8–60°C)
Storage: -4–176°F (-20–80°C)
Power: 9-V alkaline battery
Weight: 10.8 oz (306 g)
Connections: Dual barbed ports + compression fittings
Agency Approvals: CE, FM
Optional AV Kit
Available airflow kit includes pitot tube, static pressure tips with magnetic mounts, tubing, step drill, AV slide chart, battery, and fitted carrying case.
