Static pressure type level gauge

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Static input type level gauge imported sensor chip, precision temperature compensation, and increase…

Products overview:

ZW - DB401 seriesStatic pressure type level gaugeGood stability, high precision, directly into the measured medium, install and use is very convenient.Solid state structure, no moving parts, high reliability, long service life from water and oil to high-precision measurements, larger paste viscosity can not be measured medium blister, deposition, the influence of the electrical characteristics of wide range of temperature compensation.Cable type has the power supply reverse polarity protection and overload current limit protection.

Second, the working principle:

ZW - DB401 series static input type level gauge based on the measurement principle of fluid static pressure is proportional to the height of the liquid, the piezoresistive effect of diffused silicon or ceramic sensitive element, the static pressure into electrical signals.After temperature compensation and the linear correction.Converted into a standard 4-20 madc current signal output.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: liquid surface atmospheric pressure;

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 - DB401 series static input type level gauge is mainly used in urban water supply and drainage, water treatment plants, reservoirs, rivers, oceans, oil tank, and oil, chemical, electricity and other departments of level measurement, can be measured medium is water, oil, acid, alkaline and viscous liquid.Instrument output two wire 4 ~ 20 madc standard current signal, with advanced technology, high precision, stable and reliable quality, convenient installation, detection is a kind of process control system in the ideal liquid level meter.

Four, the main features:

1, good stability, full, zero long-term stability can amount to 0.2% FS/year.Within the scope of the compensation temperature 0 ~ 70 ℃, the temperature drift less than 0.2% FS, throughout the allowed working temperature range is less than 0.5% FS.

2, with reverse protection, current limiting protection circuit, when the installation is negative answer the reverse will not damage the transmitter, exception to send automatically within 35 ma current limit.

3, solid structure, no moving parts, high reliability, long service life.

4, easy installation, simple structure, economy is durable.

Five, the technical parameters:

1, the measuring range: 0-0.1 m ~ 0 to 35 meters;

2, zui big overload: 1.5 times less than the tube length

3, survey forms: balanced bell type;

4, precision grade: 0.5% FS.

5, power supply voltage: 24 VDC;

6, load resistance: 500 Ω or less;

7, measuring medium: all kinds of liquid.

8, long-term stability: plus or minus 0.2% FS/year;

9, environment relative humidity: 0 ~ 95%;

10, compensation temperature: 0 ~ 70 ℃;

11, the working temperature: - 40 ~ 240 ℃ high temperature zui can do 350 degrees (order).

Six, the structure and materials:

1, transmitter relay box: cast aluminum, 100 x 68 x 110, shell epoxy resin coating;

2, transmitter probe: 1 crl8ni9ti, 30 x 150 29, anti-corrosion for 30 to 44 * 140;

3, guide gas cable: 30 diameter 7 6 core PVC cable, anti-corrosion cable sheath for ptfe;

4 (excluding gas leading cable), weight: 0.6 kg;

5, electrical interface: M20 x 1.5.

Seven, installation and debugging methods:

1, cable type and lever 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.

2, 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.

3, when using the 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:

1, using intelligent circuit debugging methods:

The zero -- -- -- -- -- - when the liquid level position is 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 high, 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, automatic adjustment to 20 ma output current.

2, USES 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.

Eight, note:

1, who supply products with instruction manual and the certificate of approval, including product number, technical parameters, production date, etc., please check carefully, lest use wrong.

2, connect the power supply shall be in strict accordance with my company connection wiring instructions.

Found in 3, the use of exception, should turn off the power and stop using, check, or directly to our technical department.

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

Nine, selection of code:

Ten, design selection and ordering information:

1, specifications: ZW - DB400 series static pressure type level gauge;

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.

Nine, 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.