WM1351DP Differential Pressure Transmitter pressure transmitter provides a kind of reliable measuring way. It is used for measuring pressure, level, density of liquid, gas or steam and convert the value of above into current signal output or digital protocol output. The pressures are directly applied to the isolating diaphragm that provide isolation and resistance against process fluid corrosion. Being microprocessor based, the electronic circuit is extremely versatile and accurate. Combined with the sensor precision, it provides the high accuracy and range ability. Transmitter performance is improved by continuous monitoring of the sensor temperature and corresponding corrections. A local display permits easy reading and writing of data.

WM1351 Pressure Transmitter design is offered for Differential Pressure (DP), Gage Pressure (GP) and Absolute Pressure (AP) measurements. WM1351 utilizes capacitance sensor or monocrystalline silicon pressure sensor for pressure measuring. This product can accurately measure flow, vacuum degree, liquid level and density etc. The major components of the WM1351 are the sensor module and the electronics housing. The sensor module contains the oil filled sensor system (isolating diaphragms, oil fill system, and sensor) and the sensor electronics. The sensor electronics are installed within the sensor module and include a temperature sensor (RTD), a memory module, and the capacitance to digital signal converter (C/D converter). The electrical signals from the sensor module are transmitted to the output electronics in the electronics housing. The electronics housing contains the output electronics board (microprocessor, memory module, digital to analog signal converter or D/A converter), the local zero and span buttons, and the terminal block.

WM1351DP Pressure Transmitter is applied to the isolating diaphragms, the oil deflects the center diaphragm, which then changes the capacitance. This capacitance signal is then changed to a digital signal in the C/D converter. The microprocessor then takes the signals from the RTD and C/D converter calculates the correct output of the transmitter. This signal is then sent to the D/A converter, which converts the signal back to an analog signal and superimposes the HART signal on the 4-20mA output.

FEATURES

2-wire mode, 4～20mA analog output, HART® protocol.

Complete varieties, high accuracy, and good stability.

Isolation ex-proof housing structure, strong resistance to frequency conversion interference.

High static pressure, high over pressure protection.

APPLICATIONS

Process control fields for the industries of petroleum, chemical industry, metallurgy, electricity, food, paper making, medicine, machine manufacturing, scientific experiment and military

SPECIFICATIONS

Measuring object: liquid, gas and steam

Measuring range: 0~0.1kPa to 0~40MPa

Output signal: 4~20mA DC (+HART protocol)

Power supply: 15~45V DC

Range and zero point: adjustable

Humidity: relative humidity 5~95%

Precision: 0.25%FS, 0.1%FS, 0.075%FS

Temperature drift:

±1kPa：±0.5%FS； ±6kPa：±0.3%FS； Other ranges：±0.25%FS

(Standard ranges, -20～70℃)

Ambient temperature -30℃～80℃; with LCD gauge -30℃～70℃

Medium temp. -40℃～125℃

Storage temp. -20℃～70℃

Insulation resistance ≥200MΩ/250VDC

Ex-proof grade: Exd IIC T6

Converter housing: Low copper cast aluminum alloy with Polyurethane paint

Fill Fluid: Silicon / Fluorine Oil

Protection Class: IP65

Maximum positive shift is 500% of minimum adjusting span; maximum negative shift is 600% of minimum adjusting span.

Static pressure: 4, 10, 25, 32Mpa

Electrical connection: M20×1.5 (Female), NPT1/2 (Female)

Pressure connection: M20×1.5 with welded pipe, NPT1/4 (Female), NPT1/2, NPT1/2 (Female), G1/2 with welded pipe, G1/4, 3-valve manifold set M20×1.5 with welded pipe (304/316 options), 3-valve manifold set NPT1/4 (Female) (304/316 options)

Weight: 3.5kg (not including accessories)

Material:

Flange/Adaptor: Stainless Steel

Drains/Vents: Stainless Steel

Diagrams: Stainless Steel 316/Monel /Haste alloy C/ Tantalum

Filling liquid: Silicon oil

Wetted O-Ring: Viton/ Buna-N

Seal O-Ring: Viton/ Buna-N

Bolts & Nuts: Carton Steel/Stainless Steel