Manometers,PortableTEST EQUIPMENTDWYER INSTRUMENTS, INC. | www.dwyer-inst.com 434Series 477 Handheld Digital Manometers are packed with features you need to makepressure measurement and recording faster, easier and more accurate than ever. First, youcan instantly select from up to nine of the most widely used pressure units without havingto waste time and risk mistakes with tedious conversions. Next, a non-volatile memoryfunction enables storage of up to 40 readings — perfect for HVAC technicians making Pitottube traverses of airflow readings across a duct. The FM approved models are intrinsicallysafe 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. Itautomatically shuts itself off after 20 minutes to minimize battery drain. Electronic zeroingmeans 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 situationswhere readings fluctuate. We even included an audible alarm to warn you of overpressureplus a visual alarm warning in case ambient noise levels are too high to hear the alarm.Audible alarm also confirms a value has been stored, eliminating the need to observedisplay during a duct traverse.FEATURES New low pressure ranges USB option comes with cable and software for easy data downloading Instant selection from up to nine english/metric units Stores 40 readings in memory for later reference Measure positive, negative or differential pressures Large easy-to-read 0.4 LCD display includes switchable backlight for great visibility — anywhere Both audible and visual overpressure alarms Includes and - indicators plus low battery warning Operates up to 100 Hours on a single 9 V batteryHandheld Digital ManometerSelectable Pressure Units, ±0.5% Accuracy , FM Approved IntrinsicallySafe for Hazardous Locations, Class 1, Div. 1, Group A, B, C, D, T4SPECIFICATIONSService: Air and compatible gases. FMmodels air and compatible combustiblegases.Wetted Materials: Consult factory.Accuracy: ±0.5% FS, 60 to 78°F (15.6to 25.6°C); ±1.5% FS from 32 to 60°Fand 78 to 104°F (0 to 15.6°C and 25.6to 40°C).Pressure Hysteresis: ±0.1% of full-scale.Pressure Limits: See chart.Temperature Limits: 0 to 140°F (-17.8to 60°C).Compensated Temperature Limits:32 to 104°F (0 to 40°C).Storage Temperature Limits: -4 to176°F (-20 to 80°C).Display: 0.42 (10.6 mm) 4 digit LCD.Response Time: 1 s.Resolution: See chart.Power Requirements: 9 V alkalinebattery, installed non-functional, userreplaceable.Weight: 10.2 oz (289 g).Connections: Two barbedconnections for use with 1/8 (3.18mm) or 3/16 (4.76 mm) ID tubing. Twocompression fittings for use with 1/8 (3.18 mm) ID x 1/4 (6.35 mm) ODtubing for 477-7-FM 477-8-FM only. Agency Approvals: CE, FM.