WL1351DP-1199 Remote Capillary Level (Differential Pressure) Transmitter provides a kind of reliable measuring way. It is designed on the basis of WL1351P (DP) and used for measuring differential pressure, level, density of liquid, gas or steam and converts 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.

WL1351DP-1199 utilizes capacitance sensor technology for pressure measuring and then based on which to calculate the level of liquid (P=ρ*g*H). The sensor module contains the oil filled sensor system (isolating diaphragms, oil fill system, sensor and mounting flange) 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.

For WL1351DP-1199 design, the pressure is applied to the isolating diaphragm which is welded on the flange. Flat flange and insert flange are available. The sizes of the flange can be customized according to use´s requirements. The material of diaphragm can be optional for different kinds of corrosive liquid as well.

The design of WL1351DP-1199 is for preventing survey medium from directly entering into the internal transmitter. The sensor receives the change of pressure by the diaphragm on the remoter flange which is connected with the transmitter through capillary filled with silicon oil. WL1351DP-1199 is suitable for the following operation conditions:

1.       Mediums with high temperature should be isolated with transmitter.

2.       Measured mediums are severe corrosive to sensitive parts of transmitters.

3.       Suspending liquid or mediums with high viscosity.

4.       Measured mediums are crystallized due to change of environment or technological process.

5.       Strict purification of measuring head is needed for replacing measured mediums.

6.       Measuring head must be kept clean and sanitary.

7.       Seal pressure container measurement.

SPECIFICATIONS

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

Temp. drift：±0.5%FS (Standard ranges, -20～70℃)

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

Medium temp.: -30℃～245℃

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

Process Connections: Flange, Clamp. (With or without capillary)

Protection Class: IP65

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

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

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