High precision differential pressure transmitter

ZW3051DP seriesHigh precision differential pressure transmitterIs the introduction of foreign advanced technology and equipment production of new type of transducer, the key raw materials, components and parts are imported, the whole machine after assembled and tested strictly, it has advanced design principle, complete specifications, installation convenient use, etc.Due to the aircraft on the total integration of the current domestic zui appearance for popular and widely used two kinds of transducer (3051 with yokogawa EJA rosemount) the structure of the advantages, for the users to have the feeling that find everything new and fresh, at the same time with the traditional 1151, CECC etc. Series of products can be directly replace on installation, strong commonality and replace ability.For domestic automation level unceasing enhancement and development of 3051 dp smart differential pressure transmitter design cabinet and delicate, more has introduced HART field bus protocol of intelligent function.

Second, the working principle:

ZW3051DP series high precision differential pressure transmitter is when two of the measured medium pressure ventilation with high and low pressure chamber, two functions in the delta components (i.e., sensitive element) on either side of the segregation on the diaphragm, 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.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:

ZW3051DP series high precision differential pressure transmitter used for working in high pressure environment measure liquid, gas or liquid level, flow and pressure of steam, then into 4 ~ 20 ma DC signal output.Intelligent communication with HART hａnd operator, through its setting, monitor or with upper unit into the scene monitoring system.

Four, the main features:

1, high precision;

2, good stability;

3, 4-20 madc two wire;

4, solid element, plug type printing circuit board;

5, small, light weight, strong earthquake;

6, continuous tunable range, zero external;

7, positive transfer of 500%;Negative transfer of 600%;

8, damping adjustable;

9, one-way overload protection characteristics;

10, no mechanical moving parts maintenance work less;

11, the structure of the whole series of unified, strong parts interchangeability;

12, optional contact medium diaphragm material (316 l, TAN, HAAS - C, MONEL and other corrosion resistant material);

13, explosion-proof structure, all-weather use;

14, intelligent HART fieldbus protocol.

Five, the performance parameters:

1, use object: liquid, gas and steam;

2, measuring range: 0-0.06 kPa to 0 to 40 mpa;

3, the output signal: 4-20 ma DC;

4, 12-45 VDC, general is 24 VDC;

5, load characteristic: related to the power supply, load ability in the era of a power supply voltage (load), RL load impedance and voltage VS relation is: RL (v - 12) or less;

6, indicator: LCD or LFD digital tube display.

7, explosion proof: flameproof dIIBT4 b: intrinsically safe iaIICT6;

8, range and zero: external continuous adjustable;

9, plus or minus migration: zero after positive transfer and negative transfer, range, measurement range, of the absolute value of the upper limit and lower limit are less than 99% of the measurement range limit (intelligent: range than 15:1) the most-positive migration amount 500% of the smallest calibration range;The largest amount of negative transfer of 600% of the minimum working range;

Working temperature range, temperature range: 10 amplifier: - 29 ~ + 93 ℃ (LT is 25 ~ + 70 ℃) pump silicone oil measuring element: - 40 ~ + 104 ℃ when the pump flange transmitter high temperature silicone oil: + 15 ~ + 315 ℃, normal silicone oil: - 40 ~ + 149 ℃;

11, the static pressure: 1, 4, 10, 25, 32 mpa;

12, the temperature, relative humidity of 0 ~ 99% RH.

13, volume variation: < 0.16 cm3;

14, damping (step response) : silicone oil filling, generally between 0.2 s to 1.67 s continuous adjustable.

Six, the technical parameters:

(without migration, in standard working conditions, silicone oil, 316 stainless steel isolation diaphragm);

1, accuracy: + / - 0.075% (0 intelligent), plus or minus 0.1% (smart), plus or minus 0.25%, plus or minus 0.5%;

2, dead zone: no (0.1%) or less;

No more than 3, stability: six months the basic error of the absolute value of maximum range;

4, vibration impact: on any axis, the vibration frequency of 200 hz;

5, power supply: less than 0.005% of output range V.

6, the load effects: power if stability, the load has no effect;

7, installation location: the biggest can produce 0.24 kPa zero error.

Other:

1, isolating diaphragm: 316 stainless steel, hartz alloy C - 276, monel alloy, titanium or tantalum;

2, vent/drain valve: 316 stainless steel;

3, flange and fittings: 316 stainless steel;

4, contact medium "O" ring: nitrile rubber, fluorine rubber;

5, pouring liquid: silicone oil or inert;

6, bolt: 316 l stainless steel;

7, electronic shell material: low copper aluminum alloy;

8 and pressure fittings: flange 1/4 NPT, center distance of 54 mm;1 1/2 NPT or M20x1 joint. 5 male thread taper sealing ball, belt joint center distance, 54, 57.2 50.8 mm;

9, signal wiring hole: G1/2.

Seven, fault diagnosis:

Transducer in the measurement process, often appear some fault, fault of decision analysis and handling in time, is very important for ongoing production.We according to the experiences of the daily maintenance and some decision analysis method and the analysis process were summarized.

1, the investigation method:

Review before failure of flint, smoke, odor, power supply change, lightning, damp, wrong operation, and maintenance.

2, intuitive method:

Observation circuit of external injury, guide of pressure pipe leaking, overheating in the circuit and power supply switch state, etc.

3, test.

A, open circuit detection: separately from the rest parts of the suspected fault and to see whether the fault disappear, if lost, then determine the malfunction, or can be carried out to find the next, such as: smart differential pressure transmitter can't normal Hart, telecommunication, power supply can be disconnected from the instrument noumenon, the method of field plus a power transmitter power to communicate, to see if the cable stack 2 KHZ electromagnetic signals interfere with communication.

B, short circuit test: in the case of security, the related part of the loop short directly, such as: small difference transmitter output value, can guide tube disconnected, from a valve directly to the outside differential pressure signal directly led to the differential pressure transmitter, on both sides to observe the transmitter output, to determine the pipeline wall, leakage of connectivity.

C, replace, test: will doubt defective parts replacement, judge fault position.Such as: suspected transmitter circuit board failure, can be temporary replacement, to determine the reason.

D, division of detection: the measuring circuit of divided into several parts, such as: power supply, signal output, signal transmitting, signal detection, according to the points of inspection, by Jane to numerous, situated in, narrow range, find out the fault location.

Eight, 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.

Nine, when using the differential pressure transmitter should be paid attention to the following three points:

1, the differential pressure transmitter before use must be the measuring range, zero drift, accuracy and error of static pressure after school.

2, after installation in the transmitter, I still need to check before driving a variety of job stress, temperature transmitter, the measuring range, drift, etc.To see if and actual situation, if there are discrepancies, you must find out the reason and correct to drive.

3, open and stop when, should avoid instrument under unidirectional static pressure.

Ten, selection of code:

Eleven, design selection and ordering information:

1, ZW3051DP series differential pressure transmitter type according to the selection of specification table according to the need to make sure.

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

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

4, differential pressure transmitter to match three valve group, the throttle device, need to be indicated separately.

5, 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.

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

7, when far eastone transmitter of choose and buy, should also be based on different remote flange selection table according to the need to be sure.

8, if remote transmitter should be used in vacuum and high temperature occasion, special label when you order.

After-sales service commitment:

1, our company sold by differential pressure transmitter series products appear quality problem, within twelve months 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.