Brief introduction

The WS3051-GP capacitive pressure transmitter (hereinafter referred to as the intelligent transmitter) adopts advanced integrated circuits and surface mounting technology, and adds communication, query, testing, configuration and other functions on the basis of the analog transmitter. It can improve calibration accuracy, enhance environmental temperature compensation effect, and greatly improve the quality of the transmitter.

1. The intelligent transmitter applies advanced digital technology and frequency phase shift keying (FSK) technology, which improves the overall performance and reliability of the machine, and facilitates the connection between the site and the control room.

2. In addition to remote communication capabilities, smart transmitters also have local range and zero adjustment buttons for easy on-site adjustment after installation.

3. The electronic components of the intelligent transmitter adopt advanced integrated circuits and surface mounting processes, and have functions such as communication, inquiry, testing, and configuration.

2、 Working principle

Figure 1-1 shows the basic working principle of the WS3051-GP capacitive pressure transmitter, which is an intelligent transmitter. The working principle and functions of each component will be described below.

Figure 1-1 Block diagram of the working principle of the intelligent transmitter

1.1 "δ" chamber sensor (sensitive element)

Figure 1-2 "δ" Room

The core of an intelligent transmitter is a capacitive pressure sensor called the "delta" chamber (see Figure 1-2).

The sensor is a completely sealed component,The process pressure is transmitted to the sensing membrane through the isolation membrane and the filled silicone oilCausing displacement.

passThe capacitance difference between the sensing film and the two capacitor plates is determined by electricityThe sub components are converted into electrical signals with a two-wire output of 4-20mA DC.

1.2.0 Circuit board module

The circuit board module of the smart transmitter is a circuit board that uses application specific integrated circuits (ASICS) and surface packaging technology. The circuit board receives signals from sensors and performs correction and linearization. Circuit board moduleThe output departmentConvert the digital signal into an analog output signal and communicate with the HART controller and upper computer software.

1.2.1 A/D Conversion

The A/D conversion circuit uses a 16 bit low-power integrated circuit to convert the analog current output by the demodulator into a digital signal, which is provided to the microprocessor as an input signal.

1.2.2 Microprocessors

The microprocessor of the intelligent transmitter controls the A/D and D/A conversion work, and can also complete self diagnosis and achieve digital communication. During work, a numerical pressure value is processed by the microprocessor and stored as a number to ensure accuracyEnsuring precisionCorrection and conversion of engineering units. In addition, microprocessors can also perform sensor linearization, range ratio, damping time, and other functional settings.

1.2.3 EEPROM Memory

EEPROM stores all configuration, characterization, and digital fine-tuning parameters. The memory is non-volatile, so even if the power is turned off, the stored data can still be preserved intact, enabling intelligent communication at any time.

1.2.4 D/A Conversion

The D/A conversion converts the calibrated digital signal sent by the microprocessor into a 4-20mA analog signal and outputs it to the circuit.

1.2.5 Digital Communication

Test and configure the smart transmitter through a communicator. Alternatively, communication can be achieved by superimposing a 02200Hz digital signal from any upper system that supports the HART communication protocol onto a 4-20mA signal,communicationAt this time, the frequency signal does not cause any interference to the process of 4-20mA.

3、 Technical features

1. High precision

2. Stability

3. Small, lightweight, and sturdySolid anti vibration

4. Good compatibility, compatible with products from other companies that comply with the HART protocol

5. Support users to debug software using handheld devices 272/275 or PC

6. Real time configuration or remote query of instruments during operation

7. It can intelligently linearize pressure signals to ensure higher measurement accuracy

4、 Product Features

1. Wide measurement range:- 0.1MPa-0, 0-(10KPa-60MPa)

2. Zero point and range are continuously adjustable

3. It has reverse polarity protection and current limiting protection

4. Outstanding impact resistance

5. High precision, high stability, and high reliability

6. The special wiring structure makes maintenance and repair particularly convenient

7. Suitable for high demand occasions and in compliance with measurement standards

8. The unique design ensures good impact performance and long service life of the waterproof hammer

9. Exquisite structure, suitable for direct separation on mechanical equipment.

10. According to special requirements, it can be made to have good anti icing performance

11A two-wire transmitter with an integrated structure, no moving parts, and easy maintenance.

12Four and a half digit display, high-definition backlight, convenient for on-site viewing.

13Intrinsically safe and explosion-proof types can be used in hazardous sites.

5、 Technical parameters

Load characteristic diagram

Basic error: 0.2% F • S. 0.5% F. S
Measurement range:- 0 1MPa～0; 0~(10KPa~60MPa) to be selected according to the user's range
Linearity: better than 0.2% F • S
Temperature drift ＜ ± 0.025% F • S/℃ (0-50 ℃)
Long term stability: ≤ 0.02% F • S/year
Response time: ≤ 10mS
Power supply: 24VDC (or any constant voltage power supply of 12VDC-45VDC)

Output: 4-20mA (or O~10mA 1~5V O~5V 0~1OV)

Load resistance: The maximum load resistance RL of the circuit board is: RL=Vs-12V/0.023A, In the formula, RL represents the maximum load resistance (in Ω), and the maximum RL during communication is 600 Ω; Vs - Power supply voltage (unit: V).

Temperature range: Electronic circuit: -40~+85 ℃, sensitive component (filled with silicone oil): -40~+104 ℃, (filled with inert oil):- 18～+71℃

Storage temperature:- 40～+55℃；

Start time:<2s at maximum damping

Volume suction capacity: ＜ 0.16cm3

Damping: The electrical damping is 0-16 seconds and can be adjusted at intervals of 0.1 seconds. The natural time of the sensitive component (filled with silicone oil) is 0.2 seconds.

Environmental temperature:- 20～ +85℃

Sensor interface (pressure connection): The connection screw holes on the pressure chamber are 1/4-18NPT, and the connection screw holes on the impulse joint are 1/2-14NPT. The center distance can be changed by changing the connection block (51, 54, 57mm).

Electrical interface: M20 × 1.5, 1/2NPT

Installation location: unlimited

Shell protection level: IP67

Process connection materials: 316L, Hastelloy C-276, Tantalum

Material of the isolation membrane for the transmitter: 316L, Hastelloy, Tantalum

Transmitter material:

The bolts are made of galvanized carbon steel;

The electrical casing is made of low copper aluminum alloy;

The surface coating of the electrical casing is epoxy spray.

Weight: Approximately 3.5kg (excluding accessories, except for flanged transmitters)

Explosion proof grade: EXd Ⅱ CT6

6、 Application industry

1. Sugar and brewing industries: extracting fruit juice, syrup, grape juice, lime juice density, alcohol GL degree, molasses, hexane/ethanol, etc;

2. Dairy industry: condensed milk, lactose, cheese, dried cheese, lactic acid, etc;

3. Mining: coal, potash, salt water, phosphate, calcium compounds, limestone, copper, gold, etc;

4. Refining: lubricating oil, aromatic agents, fuel oil, vegetable oil, etc;

5. Food processing: tomato juice, grape juice, lemon juice, tomato sauce, molasses, vegetable oil, fruit syrup, jelly, jam, etc;

6. Pulp and paper industry: black pulp, green pulp, pulp cleaning, evaporator, caustic soda, etc;

7. Beverage processing: beer, soft drinks, fruit wine, instant coffee, malt, etc;

7. Chemical industry: caustic soda, acid, urea, cleaning agents, polymer density, ethylene glycol, sodium chloride, sodium hydroxide, etc;

8. Petrochemicals: natural gas, oil and gas washing, kerosene, lubricating oil, oil/water, etc.

WS3051-GP Capacitive Pressure Transmitter Appendix:

☆ Materials with good corrosion resistance○ Corrosion resistant materialsMaterials that are not corrosion-resistant

Reference Table for Corrosion Resistance of Transmitter Diaphragm