Double flange level transmitter

Products overview:

ZW3051LDP/GP seriesIs a widely used abroad, the mature technology of capacitive sensor core body, and introduce a full set of production technology and foreign technology, to produce new series differential pressure to send.Product modular design and whole patch encapsulation, more delicate and unique plastic mold with advanced laser engraving method, makes the product more compact and perfect.In order to avoid direct contact with the transmitter isolation diaphragm measured medium provides a reliable measurement.

Due to the double flange transmitter appearance on the total integration of the current domestic popular, and widely used two kinds of transducer (rosemount 3051 with yokogawa EJA) structure of 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 the continuous improvement of the domestic automation level and the development, the series double flange transmitter in addition to the design cabinet and delicate, more has introduced HART field bus protocol of intelligent function.

Measure the liquid level in the installation, negative pressure chamber should be installed in the upper, positive pressure chamber is installed on the bottom, instrument installation of ontology in the middle, the transmitter has a negative differential pressure, the negative differential pressure such as numerical value is not big, the available method of zero.But there is a certain value, the available methods to eliminate the negative transfer, should note the vigilant to the size of the negative transfer of range only with the height difference between the two flanges h and the size of the constant liquid level height of Ho, and has nothing to do with the discretion of the transmitter installation location.So here are some instructions: in the market, double flanged liquid level transmitter and double flange level gauge is belong to the same product.

Second, the working principle:

ZW3051LDP/GP series double flange level transmitter measuring principle 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.Liquid level transmitter is by 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.

Third, mainly used for measuring the following situations:

ZW3051DP/GP series double flange level transmitter can avoid direct contact and transmitter isolation diaphragm measured medium, this method is applicable to the following several ways:

1, high temperature viscous medium.

2, easy to be crystallized media.

3, with solid particles or suspended solids precipitation medium.

4, strong corrosive or toxic medium.

Can eliminate guide the occurrence of pressure pipe leakage pollution environment;Using spacer can be avoided, because of the measuring signal is not stable, needs to add spacer often tedious work.

Accurate measurement in 5, interface and density.

Far eastone device can avoid different instant media fusion, so that the measured results truly reflect the actual situation of process changes.

6, hygiene demanding occasions.

Such as food, beverage and pharmaceutical industry production, not only requires the transmitter medium contact conform to the hygiene standards, and should be easy to wash, to prevent cross contamination of different mass media.

Four, the main features:

1, by simulating "run" online examination, to guarantee the transducer working in extreme environment temperature, medium temperature and pressure (including positive pressure or vacuum), stable and reliable work.

2, using "dynamic state" far eastone diaphragm structure, after the overload diaphragm would not be damaged;After long-term working accuracy will not change.

3, choice of welding and sealing structure of pump system rigidity, the eradication of the oil spill.

4, design the capillary combination of components, the capillary reliable protection in the field use is not easy to break.

Shape and size 5, variety, variety of the remote transmission device, and plenty of pouring liquid type, can meet the needs of the measured at various occasions.

6, can provide all kinds of special needs products, including high temperature, high vacuum range, fast response and long capillary (difference between 4.5 meters or less).8, miniaturization (2.4 kg) stainless steel flange, easy to install.

Five, the technical parameters:

Output signals: 4 ~ 20 ma DC two wire (simulated)

Two wire 4 ~ 20 ma digital signal superimposed on the dc signal, the linear output or prescribing selected by the user.(smart)

Power supply: 12 ~ 45 v DC load property of the (see photo)

Power supply: < 0.005% output range/V

Load impact: when power supply stable, no load effects.

Accuracy of measurement, calibration range of plus or minus 0.1%, plus or minus 0.2

（Standard precision is + / - 0.2%, if choose other precision in the model selection of the order, please specify.）

Quantity than: now or 100 to 1

Resistance, : usually can be adjustable between 0.1 ~ 16 seconds, when the pump inert liquid or remote transmission device, the time constant will increase.

Start time: < 2 seconds, do not need to preheat

Working environment: the environment temperature - 29 ~ 93 ℃ (analog amplifier)

- 29 ~ 75 ℃ (digital/intelligent amplifier)

- 29 ~ 65 ℃ (with display header)

Environmental humidity 0 ~ 95%

Protective features: IP65 protection ability

Explosion-proof type, flameproof Exd II BT4-6

The Ann model Exia II CT5

Static effects: zero error: plus or minus 0.5% zui limit, in a wide range for 32 mpa in the pipes under pressure by zero calibration.

Electromagnetic radiation effects: 0.05% zui value in a wide range, accept radiation frequency 27 ~ 500 MHZ, test voltage 3 v/m.

Indicator (%) : LCD digital display precision of + / - 0.2%

200 hz vibration impact: any direction vibration, plus or minus 0.05% / g.

Installation location: diaphragm is not installed vertically, the zero error of less than 0.24 KPa may be produced, but can be modified by zero.

Weight: 3.9 Kg (not including attachments)

Note: (1) remote transmission of the static pressure differential pressure transmitter also depends on the selection of the specifications of the flange.

(2) remote transmission device working temperature, the choice of types of liquid filling.

(3) remote transmission medium temperature of the differential pressure transmitter influence refers to both sides of the remote device from room temperature under the same temperature at the same time, the output generated by the change.

(4) static pressure and temperature, were measured during the great range of zui.

(5) type DP far eastone capillary on either side of the differential pressure transmitter zui large length of 7.5 meters, length difference of 4.5 meters on both sides.

There are four kinds of six, remote transmission device form:

1, flat type remote device (the standard 3 ", work pressure 2.5 MPa).

2, thread mounted remote device (zui big work pressure 10 mpa);

3, flange mounted remote transmission device;

4, and insert cartridge remote device (standard 3 "or 4", work pressure 2.5 MPa).

Seven, with remote transmission device of the transmitter is applicable to the following conditions:

1, you need to high temperature medium from the transmitter.

2, corrosion transmitter sensitive element for measuring medium.

3, due to environment or measured medium temperature change and solidifying or crystallization.

4, replace the measured medium need strictly to purify the measuring head.

5, suspending liquid or high viscosity medium.

6, measuring head must maintain clean sanitation.

7, sealing pressure container.

Eight, maintenance procedures:

1, the structure:

Double flange level transmitter by differential pressure transmitter, capillary and belt of flange seal diaphragm.Seal diaphragm role is to prevent the pipe in the medium directly into the differential pressure transmitter, it is between the transmitter and by filling of liquid (usually use silicone oil) capillary connected, when diaphragm pressure to produce tiny deformation, deformation or frequency through capillary liquid is passed to the transmitter, the transmitter converts the output signal after processing.

2, appearance inspection:

A, flange check: check the flange connected to the equipment section of the seal are in good condition;Flange and capillary, capillary and itself if there is a connection part of the transmitter and capillary liquid leakage;Flange diaphragm deformation, damage, corrosion, scaling and other adverse conditions.

B, the transmitter inspection: check whether there is any damage, corrosion and other failure on transmitter shell, handle in time when problems found.

3, acceptance:

A, open the cover in the transmitter, check the sealing ring is damaged, if the damage to change in time;Check the circuit boards and other components are in good condition.

B, check the wiring of transmitter are in good condition.

C, disconnect the power supply, wire, insulation resistance checks, with a 500 v megohmmeter check transmitter terminals and shell, the insulation resistance between the resistance value should be greater than 20 m above.

4, transmitter debugging calibration

A, in order to ensure the measuring accuracy of dual flange level transmitter transmitter, cannot open capillary, so check to check with flange transmitter;Before installation, can use pneumatic analog signals and calibrate the HART com.

B, zero and span adjustment steps: zero and range of output, so that it is within the scope of permissible error.Continuous pressure, with the range of 0%, 25%, 50%, 75%, 150% of the pressure calibration, when pressure is stable after the record on the standard ammeter displays the current value and do return error checking.If calibration error exceeds permissible error range, should readjust the check.Adjusting method when operated by HART, see HART instructions accordingly.

4, installation:

A, far eastone flange installation:

High and low pressure on both sides of the flange should be installed correctly, can't put wrong;To reduce the influence of environment temperature difference, can be high and low voltage side of capillary bundle together, and fixed to prevent the wind and the influence of vibration and so on (super long section of the capillary volume in fixed together).Be careful not to damage the surface of the liquid membrane.Don't distort, extrusion capillary, don't put too much pressure to it.

B, the installation of transmitter ontology: use the installation bracket, the transmitter ontology is installed on the pipe diameter of 50 mm.Can be installed in horizontal pipe and the vertical piping installation.

5, note:

A, the four bolts fastening measuring capacitance room, connecting the capillary and let room part of the set screw absolutely not loose, liquid sealed to prevent leakage and instrument damage.

B, wiring should avoid large capacity transformer, motor or power with power interference sources;Wiring should disconnect the power supply interface of dustproof plug;Thread department should undertake waterproof treatment (waterproof zui good use when not hardened silicone sealant series);To prevent interference, and other signal cable should avoid power cable through the same cable protection tube;For explosion-proof type instrument, in order to ensure the explosion-proof performance, must be in accordance with the relevant provisions of the wiring.

Nine, matters needing attention and routine maintenance:

1, using a new double flange differential pressure transmitter, to check the flange in the diaphragm liquid adequacy (how many of each production electrode internal charging different requirements), such as too little, should be returned to the factory maintenance.

2, for never immersed in solution of diaphragm and dry on the sensor for a long time, before use to need to look at is damaged, the purpose is to make after compression, sensor diaphragm rupture, causing the oil mixed with measuring medium.

3, daily use flange removal should be used when not in use cases, avoid by all means will be diaphragm bare outside.

4, need not can do put for a long time, often use zui good save in the fluid of the electrode to protect, but to soak activated before use.

5, measurement of acid alkali will greatly reduce the electrode life, so if you need frequent measurement of acid alkali zui good special acid alkali resistant diaphragm of choose and buy.

6, membrane cleaning water, water should not be too big, do not use scrubbing brush iron or other metal.

7, flange to should take put down gently, the diaphragm is very fragile, so as not to knock against.

Ten double flange transmitter, intelligent selection:

Intelligent double flange transmitter is based on the main body in the transmitter of additional remote transmission device conversion product, so the selection of work can be divided into two steps: first, determine the type of transducer main body (DP), measurement range and structure material, and then according to the requirement of on-site installation far eastone device type and size.Due to the parameters of the pump system (such as pouring the liquid temperature, viscosity, and the length of the capillary) is closely related to the performance of the transmitter, so in subject selection of category in the transmitter, no separate list to choose from.

Ten, selection of code:

Eleven, design selection and ordering information:

1, working pressure also depends on the selection of the specifications of the flange.

2, remote transmission device working temperature, the choice of types of liquid filling.

3, far eastone pressure transmitter is one side of the remote device by temperature effect, the output generated by the change.

4, static pressure and temperature, were measured in the maximum range.

5, far eastone pressure transmitter on one side of the capillary length is 1.5 meters, commonly length shoulds not be more than 3 m agreement to special cases.

After-sales service commitment:

1, our company sold by liquid level transmitter series products within twelve months appear quality problem, is 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.