Series-475

Supported Applications

The Series 475 is an Intrinsically Safe Handheld Digital Manometer that measures positive, negative or differential pressures of air and compatible combustible gases, in ranges from 1 in w.c. to 150 psid. Dual push pads on the front panel control on/off, auto zero and pressure-unit selection, so operation is simple with no set-up required.

• Portable field pressure measurement of air and compatible gases
• Differential, positive and negative (gauge) pressure checks
• Air velocity measurement when used with a Dwyer Pitot tube and the -AV kit

The manometer is FM approved to be intrinsically safe in hazardous locations, Class I, Div 2, Groups A, B, C, D, T4 Ta = 70°C, and is CE compliant. It is built in a rugged aluminum case and reads out on a 4-digit LCD with 0.42" (10.6 mm) digits.

Operating Conditions & Performance

Accuracy is ±0.5% FS from 60 to 78°F (15.6 to 25.6°C), and ±1.5% FS across the wider bands of 32 to 60°F and 78 to 104°F. Pressure hysteresis is ±0.1% FS.

• Operating temperature: 0 to 140°F (-17.8 to 60°C).
• Compensated temperature range: 32 to 104°F (0 to 40°C).
• Storage temperature: -4 to 176°F (-20 to 80°C).
• Power: 9 V alkaline battery, installed non-functional and user replaceable.
• Weight: 10.8 oz (306 g).

Process connections are two barbed connections for use with 1/8" (3.18 mm) or 3/16" (4.76 mm) ID tubing, plus two compression fittings for 1/8" (3.18 mm) ID x 1/4" (6.35 mm) OD tubing on the 475-7 and 475-8 only. Wetted materials are consult factory.

Configuration Options

Models differ by pressure range and by the maximum pressure the sensor can tolerate, letting the same handheld platform cover low inches-of-water-column readings up through high-psi work. Higher-range models add compression fittings for their higher working pressures.

• Inches-water-column models (475-000 through 475-3) cover 0 to 1.000 in w.c. up to 0 to 200.0 in w.c., with maximum pressures from 5 psig to 30 psig.
• PSI models (475-4 through 475-8) cover 0 to 10.00 psi up to 0 to 150.0 psi, with maximum pressures from 30 psig to 200 psig.
• -AV air velocity kit adds static pressure tips (A-303), a pitot tube, an A-397 step drill and an A-532 air velocity slide chart for velocity measurement.
• -NIST adds a NIST traceable calibration certificate.

Accessories include the A-402A tough gray nylon carrying case and the A-47X-BOOT protective magnetic rubber boot.

Key Product Differences

The model number is 475-<range>-FM. The range models and their maximum pressures are:

• 475-000-FM — 0 to 1.000 in w.c.; max 5 psig.
• 475-00-FM — 0 to 4.000 in w.c.; max 5 psig.
• 475-0-FM — 0 to 10.00 in w.c.; max 5 psig.
• 475-1-FM — 0 to 20.00 in w.c.; max 10 psig.
• 475-2-FM — 0 to 40.00 in w.c.; max 10 psig.
• 475-3-FM — 0 to 200.0 in w.c.; max 30 psig.
• 475-4-FM — 0 to 10.00 psi; max 30 psig.
• 475-5-FM — 0 to 20.00 psi; max 60 psig.
• 475-6-FM — 0 to 30.00 psi; max 60 psig.
• 475-7-FM — 0 to 100.0 psi; max 150 psig.
• 475-8-FM — 0 to 150.0 psi; max 200 psig.

The -AV air velocity kit is offered on several ranges (for example 475-0-FM-AV, 475-00-FM-AV and 475-1-FM-AV).