Single Crystal Silicon Micro Differential Pressure Transmitter

I. Product Overview:

ZWA120A series single crystal silicon differential pressure transmitter is a new type of transmitter introduced into advanced technology and equipment abroad. The key raw materials, components and components are all imported. The whole machine has been rigorously assembled and tested. The product has advanced design principle, complete varieties and specifications, and easy installation and use. Because the appearance of the model is fully integrated with the current domestic fashion, it has strong versatility and substitution ability. It adopts specially designed amplification circuit board and special temperature compensation technology, and has stable and reliable performance.

2. Small lightweight design:

ZWA120A series single crystal silicon differential pressure transmitter reduces the weight of this model to half of the original model due to the use of ASIC amplifier design to reduce packaging, as well as the miniaturization of diaphragm box structure and flange. ASIC design not only reduces the number of parts, but also improves the reliability of the amplifier.

3. Fieldbus communication capability:

ZWA120A series single crystal silicon differential pressure transmitters provide two Fieldbus modes, FOUNDATION? Fieldbus low-voltage mode and PROFIBUS PA equipment, in order to achieve the cooperation between Astor and other suppliers. In software aspect, ZWA120 series uses two AI function blocks to calculate differential pressure and static pressure, thus realizing flexible instrument configuration.

4. Application occasions:

ZWA120A series single crystal silicon differential pressure transmitter is used to measure liquid level, flow rate and pressure of liquid, gas or steam under high working pressure environment, and then convert to 4-20mA DC signal output. It is an ideal product for the detection of micro-pressure, primary and secondary air flow and air loss in furnace combustion chamber. It is widely used in petroleum, chemical industry, electric power, food, paper making, municipal engineering and other industries.

V. Main characteristics:

1. Super measurement performance for pressure, differential pressure, liquid level and flow measurement;

2. Digital accuracy: +(-) 0.2%;

3. Simulation accuracy: +(-) 0.75% +(-) 0.1% F.S.

4. Full performance: +(-) 0.25F.S.

5. Stability: 0.25% for 6 months;

6. Range ratio: 100:1;

7. Measurement rate: 0.2S;

8. Miniaturized (2.4kg) stainless steel flange, easy to install;

9. Process connection is compatible with other products to realize measurement.

10. The only sensor in the world that uses H-alloy sheath (technology) achieves excellent cold and thermal stability.

11. Using 16-bit computer;

12. Standard 4-20mA, with HART protocol based digital signal, remote control;

13. Support the upgrading of fieldbus and field control technology.

6. Technical parameters:

1. Targets: liquids, gases and vapors;

2. Measurement range: 0-0.25-1.5 kPa;

3. Output signal: 4-20mA DC (special for four-wire system); 220V AC power supply, 0-10mA DC output;

4. Power supply: 12-45V DC, generally 24V DC;

5. Load characteristics: It is related to power supply. The load capacity at a certain power supply voltage is shown in Figure 3. The relationship between load impedance RL and power supply voltage Vs is: RL < 50 (Vs-12).

6. Indicator table: pointer linear indicator 0-99% calibration and LCD liquid crystal display;

7. Explosion-proof grade: a: Exd II BT5 or Exd II CT6; b: intrinsically safe type (Exia II CT6 or Ex IB II CT6);

8. Range and Zero: External continuous adjustable;

9. Positive and negative migration: The absolute values of range, upper limit and lower limit of measurement range can not exceed 99% of the upper limit of measurement range after positive or negative migration of zero. The positive migration of Zui is 500% of the calibration range of Zui minor adjustment.

Seventh, matters needing attention in installation and use:

1. Differential pressure transmitter must calibrate its measuring range, zero drift, accuracy and static pressure error before use.

2. After the transmitter is installed, it is necessary to check the working pressure, working temperature, measuring range and drift of various transmitters before driving. See if it is consistent with the actual situation, if there are any discrepancies, we must find out the reasons and correct them before we can drive.

3. When opening or stopping, one-way static pressure should be avoided.