High static pressure differential pressure transmitter

ZW3051HP series high static pressure differential pressure transmitter is the introduction of foreign advanced technology and equipment in the production of new type of transducer, it selects high static pressure bellows, on both sides of the so-called static pressure is when the pressure transmitter and pressure at the same time, its output current should be 4 ma, but ordinary differential pressure transmitter when the pressure on both sides at the same time increases to more than 25 mpa hard to ensure its output in the 4 ma.So high it more used in the occasions of high flow, liquid level measurement and pressure, mainly is suitable for the petrochemical and power station high pressure differential pressure transmitter, due to the pressure up to 32 mpa, and can be one-way overload under pressure without being damaged, thus can be reliably used in high pressure system of differential pressure measurement.

Second, the measuring principle:

ZW3051HP series high static pressure differential pressure transmitter is when two of the measured medium pressure ventilation with high and low pressure chamber, role 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:

ZW3051HP series high static pressure differential pressure transmitter with 32 mpa working pressure resistance and overload protection, to ensure that the transmitter can get reliable application in the high static pressure system.Differential pressure transducer is mainly used to measure liquid, gas or steam differential pressure, pressure, liquid level and density, then transform it into a 4-20 ma. DC signal output.

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, matters needing attention in the normal course of use:

1, do not use above 36 v voltage is added to the transmitter, the transmitter were damaged;

2, do not use hard objects to touch diaphragm, which leads to the isolation membrane damage;

3, do not allow the ice measured medium, otherwise will damage the sensor element isolation diaphragm and cause damage in the transmitter, the transmitter as needed temperature protection, in case of freezing;

4, when measuring steam or other high temperature medium, its temperature should not exceed transmitter when using the limits of temperature, higher than that of transmitter using limit temperature cooling device must be used;

5, measuring, steam or other high temperature medium radiator pipe should be used, the transducer and the pipe together, and use the line pressure to the transformer.When the measured medium is water vapor, in the radiator pipe to inject the right amount of water, in case of direct contact with the transducer of superheated steam, damage to the sensor;

6, in the process of pressure transmission, the following points should be paid attention to,

A, transmitter and radiator pipe joint, do not leak;

B, before use, if the valve is closed, is used, should be very careful, slowly open the valve, in order to avoid direct impact sensor diaphragm measured medium, so as to damage the sensor diaphragm;

C, must be kept open in pipeline, pipeline of sediment will pop up, and damage the sensor diaphragm.

Nine, selection of code:

Ten, design selection and ordering information:

1, ZW3051HP high static pressure 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.