Mark III Handheld Digital Manometer from Dwyer Instruments

• New LOW Range Option 0-1.00 in. w.c.

• Measures Positive, Negative and Differential Pressures

• Rugged, Extruded Aluminum Case

• Lightweight, Fast and Easy to Use

• Dual Calibration with English and Metric Units

Applications

The Dwyer Series 475 Mark III Handheld Digital Manometer is ideal for field calibration, monitoring or trouble shooting HVAC systems, clean rooms or a wide range of other low pressure pneumatic systems. This handy instrument measures positive, negative or differential pressures of air and natural gases in ranges from 1 in. w.c. (0.249 kPa) to 150 psd (10.34 bar). The Series 475-FM Approved is intrinsically safe for hazardous locations, Class 1, Div.1, Group A, B,C, D, T4. Its simple operation and easy to read digital display make it an indispensable test instrument for the plant engineer, industrial hygienist and HVAC technician. When used with a Dwyer Pitot tube (see Air Velocity), the Series 475 Mark III can also be used as an air velocity gage. See the complete 475-1-FM-AV kit described below.

The Series 475 Mark III is housed in a durable extruded aluminum case with its solid state circuitry mounted on a tough fiberglass epoxy circuit board. A standard 9 volt battery provides up to 100 hours of operation. Dual push pads on the front panel control on-off operation and English or metric pressure unit selection. No set-up or leveling. Zero adjust knob is conveniently located on top. The large ½" LCD display is easy to read, minimizing data collection errors. Units include a "low battery" indicator. The pressure sensor used is a highly stable silicon peizoresistive device. The standard connections are dual sized for 1/8" or 3/16" I.D. vinyl or rubber tubing. Complete instructions are conveniently printed on rear of housing.

Dwyer Series 475 Mark III Handheld Digital Manometer

PHYSICAL DATA

Accuracy: ±0.5% F.S., 60-78°F (15-25°C); 1.5% F.S from 32-60°F and 78-104°F (0-15°C and 25-40°C),
Pressure Hysteresis: ±0.1% of full scale.
Temperature Effect, Zero Reading: 0.5% of full scale, 32-122°F (0-50°C).
Operating Temperature Range: 32-122°F (0-50°C).
Maximum Pressure: See Chart.
Power Source: 9 volt alkaline, included but not connected.
Pressure Connections: Two barbed connections for use with 1/8" or 3/16" I.D. tubing. Two compression fittings for use with 1/8" I.D. X 3/16" O.D. tubing for 475-7 & 475-8 only.
Battery Life: Typically 100 hours.
Display: 0.5" liquid crystal.
Size: 6 9/16"H x 2 13/16"W x 29/32"D (166 x 71 x 23 cm).
Weight, Battery included: 12 ounces (340 grams)
Caution: FM approved model suitable for use with air and natural gas.

475-AV AIR VELOCITY KIT - Includes your choice of Series 475-FM Monometer, two A-303 static pressure tips, two 9 ft. lengths 3/16" I.D. rubber tubing, no. 166-6-CF Pitot tube, A-397 step drill, A-532 air velocity slide chart and instruction bulletin H-11, all packed in a tough, molded plstic carrying case with die cut foam liner. To order, add AV suffix to any standard 475 model no.








A-402-A CARRYING CASE
Tough gray nylon pouch protects any Series 475 Manometer. Double zippered for quick and easy access. With belt loop that snaps closed.