Intelligent standard pressure transmitter

ZW3851 seriesIntelligent standard pressure transmitterUSES the import high quality pressure sensor chip, E2PROM chips was introduced by the built-in memory access sensors of temperature, pressure and the input/output characteristics correction parameters, then through the CPU microprocessor operation, automatic temperature compensation, nonlinear correction, V/I conversion and A/D conversion, the standard 4-20 ma output signal, and A superimposed on the analog signal in accordance with the digital signal of HART protocol communication.In communications, the frequency signal of 4-20 ma signal does not produce any disturbance.

Second, the working principle:

ZW3851 series intelligent standard principle of pressure transmitter is of two kinds of measured medium pressure ventilation with high and low pressure chamber, two effects at both sides of the components (i.e., sensitive element) on isolated patch, through spacer and components on both sides of the filling liquid to measure the diaphragm.Pressure transmitter is by measuring diaphragm and on both sides of the insulation on the electrodes of a capacitor.When we have different pressure on both sides, to cause measuring diaphragm displacement, the displacement and stress is directly proportional to the difference, so both sides capacitance range, through the link of oscillation and demodulation, is converted into is proportional to the pressure signal.

Applications:

ZW3851 series intelligent standard pressure transducer is mainly used for measuring gas, liquid and steam parameters such as pressure, negative pressure and absolute pressure, then transform it into a 4-20 ma. DC signal output.It can measure the exhaust system, distillation tower, evaporator and absolute pressure of crystallizer, etc.

Four, the main features:

1, the super performance measurement for pressure, differential pressure, liquid level, flow measurement;

2, digital precision: + (-) 0.05%;

3, stability: 0.25% 60 months;

4, range: 100:1;

5, measuring rate: 0.2 S;

6, miniaturization (2.4 kg) stainless steel flange, easy to install;

7, process connection compatible with other products, the realization of measurement;

8, the sensor with H alloy sheath (technology), and achieved excellent cold and hot stability;

9, using 16 computer intelligent transducer;

10, standard 4-20 ma, with digital signal based on HART protocol, the remote control support to field bus and upgrade based on the technology of field control.

Five, the technical parameters:

1, use object: liquid, gas and steam;

2, measuring range: 0-0.08 kPa to 0 to 40 mpa;

3, the output signal: 4 ~ 20 ma DC (special for four wire system);220 v AC power supply, 0 ~ 10 ma DC output;

4, power supply: 12 ~ 45 v DC, general is 24 v DC;

5, load characteristic: related to the power supply, when a power supply voltage on load capacity;RL load impedance and voltage Vs relation is: RL 50 or less (v - 12);

6, indicator: pointer linear indication 0 ~ 99% scale and the LCD liquid crystal display;

7, explosion-proof grade: a: flameproof (Exd Ⅱ BT5 or Exd Ⅱ CT6);B: this Ann model (Exia Ⅱ CT6 or Ex ib Ⅱ CT6);

8, range and zero: external continuous adjustable;

9, plus or minus migration: zero after positive transfer and negative transfer, the upper limit of range, measurement range and the lower limit value, all cannot exceed 99% of the measurement range limit.Z z dazheng migration quantity small adjustment range of 500%;Large amount of negative transfer of z z small adjustment range of 600%;

10, temperature range: operating temperature range: - 20 ~ + 88 ℃.

Six, installation requirements:

1, before installation, please read carefully the product specification, and check the related information of the product.

2, the transmitter shall be installed in ventilated, dry, no corrosion, shady and cool place, such as outdoor installation should add protective cover, avoid sun and rain, avoid transmitter performance degradation or failure.

3, the transmitter is a precision instrument, avoid strong shocks, throw during installation.

4, according to the wiring diagram properly connected.

5, pay attention to protect transmitter which leads to the cable.When used in industry site, it is recommended to use metal protection or overhead.Do not loose cable leads to the sealing nut, to avoid moisture to enter.

Seven, note:

1, when I received the product, please check whether the packing is in good condition, and check whether transmitter type and specification is consistent with you choose and buy products;

2, or the use of measuring not compatible with stainless steel, medium;

3, ensure the power supply voltage conform to the requirements of the probe power, the power of positive and negative with the positive and negative terminal of the product, to ensure the pressure source high pressure within the range of the product;

4, in the process of pressure measurement, should slow pressure and discharge pressure, avoid immediately to the most high pressure or fell to a low pressure;

5, when removing probe to ensure that the equipment has been disconnect the pressure source, in order to avoid the media overflowing accidents occurred.

6, this product not explosion-proof, used in explosion-proof area can cause serious bodily injury and major material loss;

7 belongs to precision devices, sensors, users in the use, please do not disassemble by oneself, can't touch the diaphragm, lest cause damage of product.

Eight, selection of code:

Nine, design selection and ordering information:

1, the selection of specifications in the table Numbers, symbols must fill in the clear, accurate.

2, if you have positive and negative migration, must indicate the migration amount value.

3, according to the user specified range checking.If the user has no rules, set at maximum range in the transmitter, the check will be carried out under room temperature and atmospheric pressure.

4, need labeling station number, should be indicated when ordering.

After-sales service:

1, from the date of signing of the contract, I in the way provided for products of the company offers free maintenance and maintenance service, commitment to lifelong maintenance service;

2, jiangsu wei measurement and control instrument co., LTD. Sales manager will be in regular contact with customers, understａnd the usage of products, and solve the problems of the customers to use in the process of produce, free of charge to provide technical support;

3 the man-made damage is found, the warranty period, our company is responsible for the maintenance, and the resulting maintenance fee;

4, product quality problems or are not satisfied with product, the user can choose unconditional return, wei tt&c don't charge any fees, appear quality problem, bear the freight back and forth.