Inductance type level gauge

Products overview:

ZW - DB601 seriesIntroduce the foreign similar products technology development of radio frequency induction type liquid level instrumentation.Its various level changes of the parameters can be converted into a standard current signal, remote transmission to the operating room, for secondary instrument or computer for centralized display, alarm, or automatic control.A variety of signal output form for different system configurations.Ptfe, proved extremely strong corrosive liquid such as acid, alkali and high temperature.Immersed in liquid measurement part, only a four fluorine soft wire or rod type four fluorine agent as sensing, high reliability.Fully sealed aluminum cover and stainless steel connection., output at both ends and measurement, output, three power supply circuit structure isolator ways, bring their own isolator, adapted to different signal grounding method.Perfect over-current, over-voltage, power supply polarity protection.

Second, the working principle:

ZW - DB601 series inductance into type level gauge for the principle of measurement of the electric field induction and to immersion agent changes the height of the measured medium, reflect the variation of induction frequency, the circuit transformation and the matching of 4 ~ 20 ma current signal output.Namely the calibration signal value generated by the CPC and operation on the signal value of measured medium and the difference is converted into a practical level.When the liquid level transmitter into the liquid to be tested in a certain depth, the sensor to meet the pressure on liquid surface formula is: Ρ = rho. We + Po type:

P: the pressure on the transmitter into liquid level

Rho: the measured liquid density

G: the local acceleration of gravity

Po: atmospheric pressure on the surface of liquid

H: transmitter into the depth of the liquid

At the same time, through the gas leading stainless steel will be introduced to the liquid pressure sensor of positive pressure cavity, and atmospheric pressure on the surface of the liquid Po and sensors connected to the negative pressure cavity, to offset the Po on the reverse of the sensor, the sensor measured pressure is: rho. We, obviously, through the acquisition of pressure P, can get the depth of the liquid level.

Applications:

ZW - DB601 series inductance into type level gauge its good structure and installation, can be used in high temperature and high pressure, strong corrosion, easy to crystallization, prevent jams, prevent cold junction and under special conditions, such as solid powder, granular material level, material level or the level of continuous testing, which can be widely applied in all kinds of industrial process control testing.

Four, the main features:

There were 1, simple structure, moving or elastic element, so stay on sex is extremely high, little maintenance.

2, easy installation, built in especially shows the characteristics of the structure, without any special tools.

3, easy to adjust, zero and span two potentiometer can be zero within the scope of the liquid level detection effectively any migration or range change, two adjustment each other.

4, wide range of USES: applicable to high temperature and high pressure, strong corrosive medium level measurement.

Five, the technical parameters:

1, the effective detection range: 0-0.2-20 m;

2, fine degree: 0.5, 1, 1.5 on the Richter scale;

3, pressure range: 32 mpa under negative pressure, normal pressure and high pressure;

4, work temperature: - 50 ~ 240 ℃;

5, environmental temperature: - 20 ~ 75 ℃;

6, suitable medium: acid, alkali, salt, or any of ptfe non-corrosive medium;

7, the output signal: 4-20 ma, two wire;

8, power supply, load resistance 0-750 Ω DC24V;

9, fixed way: thread M20 x 1.5, M27 x 2 flange installation DN15 and DN25, (ａnd DN80;

10, the scene show: analog display 0-99%, digital display, depth of field.

Six, installation and commissioning:

Inductance surrounds us and pole type liquid level transmitter has many installation fixed way, so as to adapt to different site conditions.When the site will not be able to provide M20 x 1.5 in the process facilities such as thread or the flange, can choose wall installation type, horizontal pipe frame and vertical posture, such as three optional installation way, make you comfortable when installation.

When measuring liquidity larger medium, to prevent violent oscillation sensor, the user can choose counterweight attachment, to have the effect of stable sensors, add weight must to put weight objects in the bottom of the container, in order to avoid pull bad sensing wires.

In the field environment is bad, the user should choose sensor shield to protect sensor, to avoid the foreign body damage or affect the accuracy of measurement.

Using ZW602 lever type liquid level transmitter, if not metal containers, you need to put the transmitter of the shell with a wire access the bottom of the container, otherwise not accurate measurement.

This product in the factory has a calibration, if need on-site adjustment can adopt the following methods:

A: using intelligent circuit debugging methods:

The zero -- -- -- -- -- - when liquid level position in zui low, at the same time hold down the "Z" key and "S" key 8 seconds after release at the same time, then "Z" key press, the output current automatically adjusts to 4 ma.

Field adjustable full -- -- -- -- -- - when the liquid level at zui highs, at the same time hold down the "Z" key and "S" key 8 seconds after release at the same time, then the "S" key press, the output current automatically adjusts to 20 ma.

B: adopting the method of analog circuit debugging:

When the liquid level in the next period, use the screwdriver slowly rotating "Z" potentiometer, observe the ammeter reading close to 4 ma.

When the liquid level in the limited time, use a screwdriver slow rotation "S" potentiometer, observe 20 ma current meter reading is close.

So above 2 to 3 times repeatedly, until zero and range are accurate 20 ma ma and 4, respectively.

After adjust, should tighten the lid of the transmitter.

Seven, appearance and installation method:

Appearance and installation:

Liquid level transmitter consists of shell, amplifier, terminal blocks, helmets, hollow wire, etc, according to the needs of the user can choose a pointer table, LCD display meter.

Installation method:

(1) place for installation of choice is easy to operation and maintenance;

2 should be installed as far as possible away from the vibration source;

(3) should be far away from heat source as far as possible;

(4) input type liquid level transmitter installation, metal probe to sink to the bottom of the container.

Eight, note:

1, the supply of products with product certificate and instruction manual with the product serial number, technical parameters, wiring diagram, production date, etc. Please check carefully to avoid using wrong.

2, when installation should be according to the product connection and screw type, check the site interface is consistent with the product interface.For screw thread interface, should slow tightened, pay attention to the sealing, can't add the torque directly to the transmitter shell, can only add on the six-party transducer interface.

3, connection should be in strict accordance with the company I use for connection.

4, this product is a precision in instrument, banned free disassembly, collision, drop, play hard.

5, the transmitter power can work, but warm up 30 minutes output stability.

6, if discovery is unusual, in use should turn off the power and stop using, check, or directly to our technical department.

7 should be restored the original packaging, transportation, storage, stored in a cool, dry and ventilated warehouse.

8, installation and use process should pay attention to not put the induction of the skin of the wire broken.

9, when installation induction leads to at least more than 10 cm away from the pool wall, otherwise not accurate measurement.

10, all four fluorine structure and lever type level ground wire must be measured medium conduction, and measurements are not accurate.

11, installation site should take effective lightning protection measures.

12, the series of any liquid level transmitter enclosure must be reliable grounding, grounding resistance should be less than 4 Ω.

13, according to the security gate flame-proof certification, its installation should be according to the requirements of the specification.

14, when the transmitter is used to "0" zone, grid power supply to the safety of the power transformer shall meet the requirements of article 8.1 GB3836.4-2000.

Nine, selection of code:

Ten, design selection and ordering information:

1, model specifications: ZW - DB600 input type level gauge series;

2, the name of the measured medium, medium density;

3, measurement range, can also be referred to as the nominal length;

4, work pressure, work under pressure;

5, working temperature: measuring the temperature of the liquid;

6, material requirements: liquid material;

7, whether matching supply flange, bolts, nuts, valves, fittings, such as sealing washer;

8, flange standard: nominal size of the flange, 3/4 ", DN25, (, DN80, DN100, etc;

9, special requirements: before ordering, please indicate in detail.