Product Description
475-7-FM Intrinsically Safe Digital Manometer for Hazardous Locations
The Series 475 Intrinsically Safe Handheld Digital Manometer – Model 475-7-FM is designed for technicians operating in flammable or classified environments where measurement safety is mandatory. Rated FM approved for Class I, Division 2 hazardous areas, this rugged instrument measures positive, negative, and differential pressure in air and combustible gases while maintaining strict safety compliance.
Built by Dwyer Instruments, the Series 475 platform pairs explosion-protection certification with field-ready durability for natural-gas systems, boiler rooms, and industrial HVAC troubleshooting.
Hazardous-Area Certification & Safety Rating
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FM Approved: Intrinsically safe
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Classification: Class I, Div 2, Groups A, B, C, D
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Temperature Code: T4, Ta = 70 °C
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Agency Approvals: CE, FM
Pressure Measurement Capabilities
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Range: 0–100 PSI (6.895 bar)
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Maximum Pressure: 150 PSIG
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Accuracy: ±0.5% FS (60–78°F)
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Differential / Positive / Negative measurement
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Pressure hysteresis: ±0.1% FS
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Optional air-velocity measurement when paired with Pitot tube
Rugged Handheld Construction for Field Service
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Protective aluminum enclosure
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Large backlit LCD
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Dual-pad front controls for zero & unit selection
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Compact 10.8 oz portable design
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Barbed & compression tubing fittings included
Hazardous-Location & HVAC Applications
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Natural-gas pressure monitoring on boilers
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Combustion-system diagnostics
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HVAC troubleshooting
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Field calibration of instruments
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Air-velocity testing with Pitot tube
Environmental & Electrical Specifications
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Service: Air & combustible gases
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Operating Temp: 0–140°F
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Compensated Range: 32–104°F
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Power: 9V alkaline battery
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Display: 4-digit LCD
