Series 477 Handheld Digital Manometers are packed with features you need to make low pressure measurement and recording faster, easier and more accurate than ever. First, you can instantly select from up to nine of the most widely used pressure units without having to waste time and risk mistakes with tedious conversions. Next, a non-volatile memory function enables storage of up to 40 readings – perfect for HVAC technicians making Pitot tube traverses of airflow readings across a duct. The Series 477 is FM approved intrinsically safe for hazardous locations, Class 1, Div. 1, Group A, B, C, D, T4.

When working in poorly lighted areas, just switch on the handy backlight feature. It automatically shuts itself off after 20 minutes to minimize battery drain. Electronic zeroing means you simply touch a single key to perfectly null out any minor pressure differences. A display HOLD key freezes the current pressure for those all-too-common situations where readings fluctuate. We even included an audible alarm to warn you of overpressure plus a visual alarm also confirms a value has been stored, eliminating the need to observe display during a duct traverse.

Service:
Air and
compatible gases. FM models: air and compatible combustible gases.

Accuracy:
±0.5% Full
Scale, 60 to 78°F (15.6 to 25.6°C); ±1.5% Full Scale from 32 to 60°F and 78 to
104°F (0 to 15.6°C and 25.6 to 40°C).

Range:
0-20.00 in
w.c.

Pressure
Hysteresis:
±0.1% of
Full Scale.

Pressure
Limits:
10 psig

Temperature
Limits:
0 to 140°F
(-17.8 to 60°C).

Compensated
Temperature Limits:
32 to 104°F
(0 to 40°C).

Storage
Temperature Limits:
-4 to 176°F
(-20 to 80°C).

Display:
0.42″
(10.6 mm) 4-digit LCD.

Response
Time:
1 second.

Power
Requirements:
9 V
alkaline battery, installed non-functional, user replaceable.

Weight:
10.2 oz
(289 g).

Process
Connections:
Two barbed
connections for use with 1/8″ (3.18 mm) or 3/16″ (4.76 mm) I.D.
tubing. Two compression fittings for use with 1/8″ (3.18 mm) I.D. x
1/4″ (6.35 mm) O.D. tubing for 477-7-FM & 477-8-FM only.

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