Industrial differential pressure transmitter

ZW308 seriesIndustrial differential pressure transmitterThe including of laying pipe installation, electrical signal cable laying, the installation of differential pressure transmitter.From both sides of differential pressure pipe directly ACTS on the transmitter on the bilateral isolation diaphragm sensor, through the diaphragm in the sealing liquid to measuring element, the measuring element will be measured the differential signal is converted to electrical signal is passed to the counterpart of converter, amplified, such as processing into a standard electrical signal output.

Second, the applications:

ZW308 series industrial differential pressure transmitter with the appearance of small, high temperature properties, pressure characteristics and input and output characteristics, can replace the ordinary pressure transmitter, widely used in petroleum, chemical, electric power, environmental protection, and other areas of the automatic detection and control.

Three, the main features:

1, double-sided 316 l metal diaphragm, good anticorrosion sex;

2, high precision, good long-term stability;

3, 3 1/2 led display;

4, resistance to electromagnetic interference design;

5, zero point and full scale output is adjustable;

6, safety explosion-proof.

Four, the technical parameters:

1, the range: 0 ~ 10, 35...1000 (KPa);0 ~ 2...7 (MPa);

2, overload pressure: 2 times the full scale;

3, electrostatic: 10 ~ 12 mpa;

4, measure medium: gases, liquids compatible with 316 l stainless steel;

5, the output signal: 4 ~ 20 ma, 0 ~ 10 ma, two wire;1 ~ 5 VDC 0 ~ 5 VDC three-wire system;

6, display mode: 3 1/2 a LED;

7, the power supply voltage: 12 ~ 36 VDC (calibration value is + 24 VDC);

F.S 8, accuracy: + / - 0.2%;Plus or minus 0.3% F.S.Plus or minus 0.5% F.S.

9, long-term stability: plus or minus 0.2% or less F.S/year;

10, compensation temperature: - 10 ~ + 70 ℃;

11, medium temperature: - 20 ~ + 85 ℃;

12, storage temperature: - 40 ~ + 125 ℃;

13, response time: 1 ms or less;

14, load resistance: R = (U - 12.5) / 0.02 - RD: U for the power supply voltage, RD for cable resistance;

15, life: > 1 x 108 pressure circulation (25 ℃);

16, diaphragm material: 316 l stainless steel;

17, the shell material: 1 cr18ni9ti and cast aluminum shell;

18, pressure interface: M20 x 1.5 or users;

19, electrical links: terminals;

10, explosion-proof level: ExiaIICT6;

21, protection grade: IP65.

Five, installation requirements:

Transmitter installation, fixed installation, high and low pressure pipe through guide medium pressure and balancing valve is introduced into the transmitter of the "H" "L" low pressure and high pressure cavity.Pay attention to the static parameters, it is forbidden to one-way overload pressure and pressure, so as to avoid damage.

Six, several applications of differential pressure transducer measurement methods are as follows:

1, combined with a throttling element, using the differential value of throttling element before and after measuring liquid flow;

2, the use of liquid is produced by its own gravity pressure difference, measure the height of liquid;

3, the direct measurement of different pipes, tanks liquid pressure difference;

Seven, in the face of differential pressure transducer fault how to exclude diagnosis:

Differential pressure transmitter in the measurement process, often appear some fault, fault timely decision analysis and processing, is crucial for the ongoing production.We according to the experiences of the daily maintenance and some decision analysis method and the analysis process were summarized.

1, survey method: review the fault occurred in front of the lighter, smoke, odor, power supply change, lightning, damp, wrong operation, and maintenance.

2, intuitive method: to observe the circuit of external injury, guide of pressure pipe leaking, overheating in the circuit and power supply switch state, etc.

3, test: test mainly can be switched from detecting circuit, short circuit, detection, the division of the four aspects.Often appear nine, failure mainly guide pressure tube obstruction:

1, the reason of blocking is mainly due to the measuring guide sewage pressure pipe or medium thick, with particulate matter causes, etc.There is a common fault is pressure pipe leaking: positive guide pressure pipe leakage to analysis the failure phenomenon of pressure pipe leaking.

2, after inspection, secondary instrument (DCS) configuration and electrical circuit is normal, normal transmitter inspection Chambers calibration, so the doubt on the problem of guide, after check, due to the leakage is a poor guide pressure pipe welding, after repair welding leakage flow measurement back to normal.

3, pressure pipe leaking reflected the transmitter output fault phenomenon mainly fall or rise and unchanged.

Namely: the transducer to measure the flow of the output signal do not tally with the actual flow, the measurement error is produced.

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.