Dwyer Instruments 490A-1 Specifications, Installation & Operating Instructions

Series 490A Hydronic Differential Pressure Manometer are versatile, hand-held,
battery operated manometers available in several basic ranges for positive or
positive differential pressure measurement and can tolerate most liquid media
compatible with 316LSS. A memory function allows storage of up to 40 readings for
later recall and a backlight provides auxiliary lighting for hard-to-see locations.
Standard are a hold feature and both visual and audible overpressure alarms. A
new feature added to the Series 490A is a field adjustable damping, independent
viewable high/low pressure readings, and low range increased resolution. This
allows the user to choose the level of display averaging rate corresponding to the
fluctuation level common in many applications. A 9 V alkaline battery is included
that provides up to 100 hours of operation.
English Metric
Model Range Range
490A-1 0 to 15 psi 0 to 103.4 kPa
490A-2 0 to 30 psi 0 to 206.9 kPa
490A-3 0 to 50 psi 0 to 344.8 kPa
490A-4 0 to 100 psi 0 to 689.5 kPa
490A-5 0 to 500 psi 0 to 3448 kPa
490A-6 0 to 200 psi 0 to 1379 kPa
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Series 490A Hydronic Differential Pressure Manometer
Specifications - Installation & Operating Instructions
Maximum
Pressure Available Engineering Units
30 psi (2.7 bar) psi, in w.c., in Hg, cm w.c., mm Hg, kPa, hPa, mbar, bar, oz/in
60 psi (4.13 bar) psi, in w.c., in Hg, cm w.c., mm Hg, kPa, hPa, mbar, bar, oz/in
100 psi (6.89 bar) psi, in w.c., in Hg, cm w.c., mm Hg, kPa, hPa, mbar, bar, oz/in
200 psi (13.78 bar) psi, in w.c., in Hg, cm w.c., mm Hg, kPa, hPa, mbar, bar, oz/in
1000 psi (68.9 bar) psi, in w.c., in Hg, cm w.c., mm Hg, kPa, hPa, mbar, bar, oz/in
400 psi (27.57 bar) psi, in w.c., in Hg, cm w.c., mm Hg, kPa, hPa, mbar, bar, oz/in
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SPECIFICATIONS
Service: Compatible gases & liquids.
Wetted Materials: 316 SS; -3V option: 316LSS, Buna-N, silicone, grease, PTFE,
brass 360, copper, reinforced acetal copolymer; -HKIT option: 316LSS, PTFE,
brass, copper.
Accuracy: ±0.5% FS from 60 to 78°F (15.6 to 25.6°C); ±1.5% FS from 32 to 60°F
and 78 to 104°F (0 to 15.6°C and 25.6 to 40°C).
Pressure Hysteresis: ±0.1% FS.
Pressure Limits: See chart
Temperature Limits: Operating: 0 to 140°F (-17.8 to 60°C); Process with -HKIT
option: -20 to 180°F (-29 to 82°C); Storage: -4 to 176°F (-20 to 80°C).
Display: 4-digit LCD (.425˝ H x .234˝ W digits).
Resolution: See chart.
Process Connections: Two 1/8˝ (3.18 mm) female NPT; -HKIT option: Two 1/4˝
male 45° flare fittings.
Power Requirements: 9 V alkaline battery, installed non-functional, user
replaceable.
Weight: 14.1 oz (400 g); -HKIT option: 3.6 lb (1.63 kg).
Agency Approvals: CE.
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