High precision micro differential pressure transmitter

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ZW3051DR seriesHigh precision micro differential pressure transmitterIs the introduction of foreign …

ZW3051DR seriesHigh precision micro 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, this product has the advanced design principle, the variety specification is complete, installation convenient use, etc.Due to the aircraft appearance on the total integration of the current domestic zui is popular, strong commonality and replace ability.For the continuous improvement of the domestic automation level and the development, this series of products in addition to the design cabinet and delicate, more has introduced HART field bus protocol of intelligent function.

Second, the working principle:

ZW3051DR series high precision micro differential pressure transmitter of the two kinds of 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:

ZW3051DR series high precision micro differential pressure transmitter is used to work 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 100% 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 ~ 100% 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, notable matters of installation:

Differential pressure transmitter and throttling device supporting the use of time, met the pressure is low, in the calculation of time often to such a situation, it is calculated the maximum differential pressure is the micro differential pressure, it puts forward high demands on the differential pressure transmitter.

Guide the installation of pressure pipe problem:

1, the differential pressure transmitter because of its small scale, the installation position and different stress caused by uneven pressure changes.(30 degrees slope, will produce 0.2 KPa pressure from left) left.Such a situation, especially in and supporting the use of pig and flowmeter, it is important to note that the installation of the differential pressure transmitter.

2, prevent the transmitter medium in contact with the corrosive or overheating;

3, prevent the dross in the guide tube deposition;

4, guide pressure pipe should be as short as possible;

5, on both sides of fluid column pressure head tube should keep balance;

6, pressure pipe should be installed in the temperature gradient and temperature fluctuation is small, no shock and vibration;

Field measurement, the method of reduce error:

1. The guide pipe should be as short as possible;

2. When measuring liquid steam guide pipe should be connected up to the flow process piping, its Angle should not be less than 1/12;

(3) for gas measurement, guide pressure pipe should be connected to the down flow process piping, its Angle should not be less than 1/12;

4. Liquid guide to avoid high pressure pipe laying, gas guide pipe layout to avoid low;

5. Two guide pressure pipe should maintain the same temperature;

6. To avoid friction influence, guide of pressure pipe diameter should be large enough;

7. Should be no gas in the tube filled with liquid conductivity pressure exists;

8. When using a spacer, on both sides of liquid level tube should be the same;

Eight, 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.

Nine, use notice:

1, the measurement of the steam and other high temperature medium, the temperature should not exceed transmitter when using the limit of the temperature, and temperature is higher than the transmitter limit must have a cooling device, the micro differential pressure transmitter when measuring temperature need to notice.

2, at the time of measurement, the tested medium are not allowed to freeze, or will damage the sensor element of isolating diaphragm, can also lead to damage in the transmitter, so will be necessary for the transmitter temperature protection, prevent the icy conditions.

3, when measuring steam or other high temperature medium, to know use radiator pipe, the differential pressure transmitter and pipe together, is to use the line pressure to the transformer.If test medium is water vapor, into the right amount of water in the radiator pipe, in case of direct contact with the transducer of superheated steam, damage to the sensor;

4, and don't let the hard object to touch diaphragm, prevent damage of lead to isolation diaphragm.

5, don't use on micro differential pressure transmitter above 36 v voltage, prevent lead to damage of transmitter.

Ten, selection of code:

Eleven, design selection and ordering information:

1, ZW3051DR series micro 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.

9, contact medium type O sealing ring material with nitrile butadiene rubber, fluorine rubber, etc.

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.