Liquid crystal display (LCD) pressure transmitter

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ZW308 seriesLiquid crystal display (LCD) pressure transmitterIntroduction of foreign advanced techno…

ZW308 seriesLiquid crystal display (LCD) pressure transmitterIntroduction 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 series pressure transmitter is liquid crystal display (LCD) 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 series pressure transmitter liquid crystal display components and parts are imported high quality silicon diffusion type, 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.

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:

1, power: 24 VDC output 4 ~ 20 ma two wire;

2, zero adjustable scope: plus or minus 5% f. S.

3, range adjustment than: 3:1 above;

4, range range: - 100 kpa ~ 0 ~ 60 mpa;

5, load characteristics, load within 0 ~ 600 Ω (24 VDC power supply) to maintain constant current output;

6, flameproof: d Ⅱ BT4, the Ann model: ia Ⅱ CT5;

7, overvoltage limit: 2 times the upper limit pressure;

8, temperature range: process: - 20 ~ 60 ℃;

9, precision grade: + / - 0.5%;

10 and stability: plus or minus 0.2% f. S.

11, weight: about 1 kg.

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, install and use notice:

1, read carefully over goods packaging product manuals.Correct connection circuit according to drawing.Especially pay attention to the connection error transmitter products may not be.

2, threaded connection products during installation and removal, must use wrench screw nut, cannot twist too tight when installation, it is strictly prohibited to other clamping parts, installation, disassembly, avoid damage related connection parts.Bring pressure Kong Duan shall not have sharp hard to reach, in order to avoid damage sensitive film or isolation membrane, it is strictly prohibited to knock, bump, it broke down.

3, products specifications, packing list, the certificate should be properly kept, it is the basis of three packs.

4, product appearance, and shall be randomly pick stitching thread processing, modification, or accept the responsibility for quality problem.

Overload 5, prohibit super, super sensitive membrane damage index overload is not in the warranty scope.

Attention should be paid to the following several kinds of usage:

A, be a larger pressure system transient overload pressure.

B, pressure test, pressure equipment such as pump head is too big, strong pressure, liquid level high speed impact diaphragm sensitive membrane, big impact momentum with pressure overload.

C, with the piston pressure gauge calibration, the piston failure stuck not found that cause stress made the high overload impact sensitive membrane.

6, due to the constant current power supply since the compensation function of diffused silicon sensor, constant current source is recommended for the power supply in principle, our company can also provide a constant sense of circulating integration products, such as measuring temperature coefficient of request is not high, conditions are not allowed to, also can use constant voltage source.

7, diffusion silicon sensor zero output cannot be directly using single arm al resistance method to eliminate, the software can be used to zero method, differential input shaping method, T resistance network modification, etc.

8, it is forbidden to use sharp hard objects, screwdriver, finger press wax directly testing, zui so likely to cause irreparable damage, silicon membrane or isolation membrane damage (direct consequence of the excess pressure overload or pressure to the products caused by zero greaten, failure, is beyond the scope of warranty.

Eight, selection of code:

Nine, 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.