ĐỒNG HỒ ĐO CHÊNH ÁP WIKA 712.25DP

Application

* Differential pressure measurement of two applied pressures

* For non-corrosive, non-crystallizing gaseous and liquid media

* Heating ventilation and air conditioning

Product Features

* Differential indication via subtracting movement and one indicating pointer

* Economical and rugged design

* Scale ranges from 0...15 psi (1 bar)

* Available in 4½" (115 mm) and 6" (160 mm)

Specifications

Sizes: 4½" & 6"

Accuracy: + 2/1/2% of span (ASME B40.1 Grade A)

Ranges: Differential pressure from 0/15 PSID(1 bard) to 0/1000 PSID (70 bard)

Static Pressure Rating: 1.3 x full scale pressure

Working Range

Steady: 3/4 of full scale value

Fluctuating: 2/3 of full scale value

Short time: 1.3 x full scale value

Operating Temperature

Ambient:-4°F to 140°F (-20°C to 60°C)

Media:max. 140°F (+60°C)

Temperature Error

Additional error when temperature changes from reference temperature of 68°F (20°C) +0.4% of span for every 18°F (10°K) rising or falling.

Weather Protection: NEMA 2 (IP 33)

Connection

Material: copper alloy

Lower mount (LM) only

2 x 1/4" NPT

Bourdon Tube

Material: copper alloy

2 x C-shape

Movement: Copper alloy, dual-subtracting

Dial: White aluminum with black lettering. Dial marked with "L" indicating the low pressure connection and "H" indicating the high pressure connection.

Pointer: 1 black adjustable aluminum pointer

Case: Black cast aluminum with built-in rear flange

Window: Instrument glass

Threaded Ring: Black aluminum

Operating Principle

High pressure needs to be applied to the right connector, low pressure to the left side. A subtracting movement will indicate the difference of two applied pressures via one pointer