Ceramic pressure transmitter

ZW308 seriesIntroduction of foreign advanced technology and equipment in the production of new type of transducer, the advantages of small volume, suitable for small space to install, direct installation process, good temperature characteristic, comprehensive precision is high.The machine after assembled and tested strictly, this product has the advanced design principle, variety complete specifications, installation convenient use, etc.Key raw materials, components and parts are imported high quality silicon diffusion type, ceramic pressure sensor as a sensitive element, using special integration module, fine temperature drift, zero, nonlinear compensation, and implementation of liquid, gas, steam medium pressure changes such as the accuracy of the measuring and transmitting

Second, the working principle:

ZW308 ceramic series pressure transmitter is when the pressure on the diaphragm, resistance to change and produce a linearization is proportional to the applied pressure of the output signal.With dc power supply, will produce a dc voltage signal output.After a second crossover, realizes the two wire system 4 ~ 20 ma output.

Applications:

ZW308 ceramic series pressure transmitter components and parts are imported high quality ceramic pressure sensor as a sensitive element, using special integration module, fine nonlinear compensation of temperature drift, zero, and, for the liquid, gas, steam medium pressure changes such as the accuracy of the measuring and transmitting.Used in water plant, oil refineries, sewage treatment plant, building materials, light industry, machinery industry, the implementation of the liquid, gas, vapour pressure measurement.

Four, the main features:

1, good stability, full, zero long-term stability can amount to 0.2% FS/year.Within the scope of the compensation temperature 0 ~ 70 ℃, the temperature drift less than 0.2% FS, throughout the allowed working temperature range is less than 0.5% FS.

2, with reverse protection, current limiting protection circuit, when the installation is negative answer the reverse will not damage the transmitter, abnormal transmitter automatically when current limit within 35 ma.

3, solid structure, no moving parts, high reliability, long service life.

4, from wind to water, oil can be high precision measurement, not affected by the quality of the measured medium size.

5, easy installation, simple structure, economy is durable.

Five, the technical parameters:

Measuring medium: compatible with 304, 316 or 316 l stainless steel of all kinds of liquid, gas or steam;

Pressure type: table pressure;

Measuring range: 0 ~ 0.5 MPa pressure table - 0-150 MPa;

Pressure overload: 2 times full scale or 300 mpa (smaller value);

Output signals: 4 ~ 20 madc (two wire system) 0 ~ 10 VDC, 0 ~ 5 VDC, l ~ 5 VDC (three-wire system);

The power supply voltage: 9 ~ 36 VDC (two wire system), 24 + / - 5 VDC (three-wire system);

Medium temperature: - 40 ~ + 150 ℃;

Ambient temperature: - 20 ~ + 85 ℃;

Removing range: - 10 ~ 70 ℃;

Storage temperature: - 40 ~ + 90 ℃;

Relative humidity: 95% or less (40 ℃)

The accuracy of the quasi: 1.0, 0.5, and 0.25 magnitude (including nonlinear, repeatability and hysteresis, comprehensive error) zero adjust output range of + / - 8%;

Range to adjust: output range of + / - 20%;

Temperature drift: plus or minus 0.05% FS / ℃ or less (20 ~ 85 ℃ temperature range, including zero and temperature range).

Stability of typical: plus or minus 0.1% FS/year zui: plus or minus 0.2% FS/year;

Medium contact material: 304, 316 or 316 l.

The shell material: 304 or 316 stainless steel;

Installation method: thread installation;

Pressure connection: M20 x 1.5, M12 x l, Gl / 4, Gl / 2 pin, etc., can be customized.

Electrical connections: four core shielded cable (degree of protection IP65) aviation DIN plug connector, can be customized.

Six, when ordering explosion-proof transmitter must pay attention to several items:

1, the transmitter explosion-proof products have two type flameproof and intrinsically safe;

2, make clear the site for the dangerous sites of flammable and explosive medium composition and places;

3, please select explosion-proof grade than flammable medium level and high humidity group or the same transmitter.

4, explosion-proof products allows the use of the environment temperature is 20 ℃ ~ + 70 ℃. -

5, when ordering intrinsically safe transmitter, must according to the nameplate and manual requirements, purchase the corresponding safety barrier and cable as required.

Seven, common troubleshooting:

1, when installation should keep transducer pressure sensitive axis perpendicular to the direction of gravity, if the installation conditions, you should adjust the transducer zero after installation fixed to the standard values.

2, residual pressure relief not to come out, so the sensor's zero come down again.Rule out the reason for this ideal method is to remove the sensor, direct look at zero is normal, if zero normal replacement of sealing ring to try again.

Three output does not change, pressure transmitter, pressure transmitter output again suddenly changes, pressure transmitter zero return not to go.The reasons for this phenomenon is likely caused by pressure sensor seal ring.

4, whether to conform to the requirements of the power supply;The power and presence of wrong wiring between transducer and load equipment.If there is no voltage or polarity reverse of transmitter terminals can cause transmitter no voltage signal output.

5, pressure sensor and transmitter shell generally need grounding, signal cable shall not be mixed with the power cable laying, sensor and transmitter there should avoid strong electromagnetic interference.Sensor and transmitter in use should be periodic verification as stipulated in the industry.

6, users in the selection pressure sensor and transmitter, should fully understａnd the condition of pressure measurement system, reasonable choice according to need, make the system work in ideal state, and can reduce the engineering cost.

7, through spacer and components on both sides of the filling liquid to measure the diaphragm.Measuring diaphragm and on both sides of the insulation on the electrodes of a capacitor.

Check once a week 8, pressure transmitter, requirement, inspection once a month, main is to clear the dust inside the instrument, the electrical components inspection earnestly, the output current value always proofread, internal pressure transmitter is low, must be separated from high voltage with the outside world.

Eight, choose:

Correct selection of high temperature type pressure transmitter is prerequisite to obtain a good using effect.We recommend that customers in the selection pressure transmitter, pay attention to the following:

1, the measured medium: liquid, gas, steam.According to the working condition to choose.

2, the accuracy of measurement, pressure transmitter, as a kind of sensor measurement, signal amplification processing, instruments, standard signal output error is inevitable.Customers can choose according to the requirement of the specific conditions, can meet the conditions.Excessive pursuit of high precision, the condition of no benefit, economy is a big expense.

3, range selection: it is recommended to use pressure transmitter for working condition of zui pressure range is 75%.For example, the working condition of zui pressure 75 mpa, choose the full range of 100 mpa pressure transmitter.

4, measure corrosive medium.According to the measured size of the corrosive medium, the choice of pressure transmitter contact materials.General pressure transmitter medium points of contact material is 316 stainless steel, if the medium to be measured for 316 stainless steel corrosion, so basically all the pressure transmitter is suitable for you of medium pressure measurement.If the medium to be measured for 316 stainless steel corrosive, you need to do chemical sealing treatment, isolation of corrosive medium, prolong service life.

5, measuring the temperature of the medium.Due to the high temperature will have an effect on the signals in pressure transmitter, so in the environment of high temperature, high temperature medium selection, when using the medium to be measured should pay attention to select the type of high temperature and pipeline do processing, when accuracy is not high, can by adding early cooling condenser pipe, and high accuracy requirements, selected special high temperature resistant type pressure transmitter, its price is much than adding condenser pipe.

6, output models.Common output model has 4-20 ma, 0 to 20 ma, 0 to 10 v, O - 5 v, etc., selection of order note, told the factory.

7, working condition of use.Main is whether to need to deal with the riot, the Ann model, flameproof.

8, pressure connection interface options.Can be customized.

Nine, selection of code:

Ten, design selection and ordering information:

1, the sensor material;

2, explosion-proof situations;

3, connecting head materials and connection mode;

4, seal materials;

5, precision;

6, range scope;

7, whether or not to bring additional options.

After-sales service commitment:

1, our company sold 308 series product quality problem within 12 months, responsible for free maintenance.

2, the warranty period, any quality problems such as the products of our company, my company is responsible for free repair or replacement.

3, the warranty period, such as user improper use, damaged products, my company is responsible for the maintenance, charge damage parts cost.

4, after the warranty period appear quality problem, my company is responsible for the maintenance, charge damage parts cost.

5, such as user need to my company site services, to users in the province I company service personnel to reach the site within 12 hours, fujian association of foreign languages and user reach the site within 48 hours.