Explosion-proof ultrasonic level meter

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Explosion-proof ultrasonic liquid level meter is a kind of intelligent non-contact (liquid) measurin…

Products overview:

ZWS - 200 k seriesExplosion-proof ultrasonic level meterBuilt-in temperature compensation, power adaptive, and can have signal processing technology, etc., to improve the measurement precision of the instrument.The clutter echo had obvious inhibition function.Use a metal die cast aluminum housing, beautiful appearance, and have very good protection.Instrument used isolation power supply industry, all input and output line lightning protection, over voltage, over current protection circuit.Products can be widely used in all kinds of solid and liquid level of liquid level measurement, also can be used in the measurement of the distance. Is the collection of ultrasonic transceiver sensor, servo circuit, temperature compensation sensor unit, monitor, control and compensation circuit or the analog signal output, serial data output unit for the integration of material level measuring instrument.

Second, the working principle:

ZWS - 200 k series explosion-proof ultrasonic level meter measuring principle is made by ultrasonic transducer (probe) high frequency pulse waves meet level surface to be tested is reflected back to the echo are converted to electrical signals received by transducer. Acoustic travel time and sound waves to object is directly proportional to the distance from the surface. And sound transmission distance S available formula for the relation of the sound velocity and acoustic transmission time T C said: S = C * T / 2. Emit ultrasonic probe part, and then by liquid surface reflection, probe part receive again, distance and ultrasonic probe to the liquid surface is proportional to the elapsed time:

Hb = ct2 namely

Distance [m] = time / 2 x sound [m]

The temperature of the sound velocity compensation formula:

Sound velocity = 331.5 + 0.6 x temperature environment

Applications:

ZWS - 200 k series explosion-proof ultrasonic level meter with automatic power adjustment, gain control, temperature compensation, adopt advanced testing technology and computer technology, improve the measure precision of the instrument, the clutter echo suppression function, ensure the truth and accuracy of measurement results.Due to adopting noncontact measurement, almost unlimited measured medium, can be widely used in water, sewage, cement, acid and alkali, pulverized coal, mud, wine, beverage, pharmaceutical and other working environment.

Four, the main features:

1, high precision

Accuracy of 0.3%, can be all kinds of interference wave.

2, stable and reliable

When we in the circuit design, starting from the power source is using high quality high isolation module, key components selection device is stable and reliable, can replace imported instrument directly.

3, safe, beautiful and waterproof level high

Adopt the die casting aluminum alloy waterproof, explosion-proof enclosure;Protection grade IP67.Instrument of explosion-proof level Ex d (ia) ia Ⅱ BT4, can monitor except hydrogen gas H2, alcohol, gasoline, carbon disulfide CS2, acetylene C2H2 all combustible liquid level.

4, low failure rate, easy to install, easy to maintain

Is a non-contact instrument, not direct contact with the liquid, low failure rate.Instrument installation, do not need to tank, will not affect the normal operation of production, instrument provides two kinds of installation, the user can through the user manual for instrument installation and debugging.

5, a variety of means to protect

All input and output interface with lightning protection, over-current, over-voltage protection function.

Five, the technical parameters:

1, the range: 0 to 4 meters, 0 to 7 meters, 0 to 10 meters, 0 to 15 meters, 0 to 20 meters;

2, measuring medium: a liquid or solid;

3, blind area: adjustable, z small 35 cm;

4, the measuring accuracy: + / - 3 mm or 3 ‰, take its head (standard conditions);

5, big z load: 500 ohm;

6, work stress: three under atmospheric pressure;

7, environment temperature: - 20 - + 60 degrees;

8, analog output: standard of 4 ~ 20 ma;

9, digital output: RS - 485, Modbus protocol (can be set by PC remote field devices);

10, open shut quantity: 1-3 way switch output;

11, show: highlight character LCD liquid crystal display;

: 12, the power supply voltage of wire 2 or 4 wire AC220V/DC24V;

13, protection grade: IP67.

Six, user menu and parameter Settings:

1 all parameters, user menu code instructions

01 - displays the current level of numerical units (meters)

02 - display measurement range numerical units (meters)

03 - small level of numerical unit (m) (typically set to 5 mm)

Note 04, 05, 06 menu item is limited to take relay output

04 - limit alarm value

05 - lower limit alarm value

06 - set the relay back the difference

2, ultrasonic level meter display state is introduced

The machine is divided into two kinds of display status

A, measuring state (namely after the power supply is in A state of measurement and display H * * * * *) if not see big H * * * * *, according to press the shift key until A H

B, setting up state (in the measurement condition, through the press SET and rising at the same time, enter the password again, then entered the Settings

3, enter the user menu

SET and rising button, and then let go at the same time, numerical interface display appear * * * * (including a * in a flash);

A, in the condition of measurement, and at the same time

B, use the shift key and the up key alternately, changing the interface number to 1234 (the user password), then press the SET key is entered the user menu (no. No. 01 to we menu), through the press SET key, can in no. 01 to 06 menu cycle.

4, the current level and other parameters are set

A, according to the above steps to find 01 menu (the current menu), press the SET key again to see the level of the original SET numerical see * * * * * (the original value, one * in flashing);

B, use the shift key and the up key alternately, the number instead of C, you need to set 02 menu range value and set up 03 small level up to remove the numerical method.

5, withdrew from the menu

In 01 ~ 6 arbitrary code menu interface, at the same time hold down the SET and the up key, and then let go at the same time, you can withdraw from the system.

Seven, the principle of installation:

1, probe surface to the low level of distance that range should be less than the choose and buy the instrument.

2, probe emission surface, the distance to the high level should be greater than the choose and buy the instrument of blind spots.

The launch of 3, probe surface should be keep in parallel with the liquid surface.

4, the installation position of probe should try to avoid directly into, discharging mouth, etc. The location of the liquid level of volatility.

5, if the wall or the tank wall is not smooth, instrument installation location should leave the wall or the tank wall above 0.3 m.

6, if the probe emission to a high level of distance is less than the blind spots of instrument of choose and buy, should be equipped with extension tube, tube diameter greater than 120 mm, length is 0.35 m ~ 0.50 m, the vertical installation, wall smooth, opening should be greater than extension tube diameter on the tank.Or will be piped to the tank bottom, pipe diameter greater than 80 mm, tube bottom hole for keep the extension tube liquid level as high as the summits of the tank.

Eight, notable matters of installation:

Ultrasonic level meter installation, and pay attention to the following:

1, the distance between the sensor and the high liquid (content) should be greater than blind area (ullage is equal to the high level + blind area) at the same time to ensure that the axis of the transducer should be perpendicular to the fluid being measured (content).

2, blind area and sensor to measure liquid () small distance, instrument can not work normally, within the range of the average value (range < 20 m) between 30 cm to 60 cm, (20 m) range > set between 60-100 cm.

3, in the midst of a fixed can add rubber gasket when necessary, at the same time, far from noise sources as possible.

4, because of the existence of firing Angle sensor in the sensor and the wall when installation should keep a certain distance.Measurement of solid material level sensor should avoid the feed opening.

5, don't be easy to cause disturbance signal in the measurement range of obstacles, such as a ladder, beams, access channels, etc.

6, the measurement of solid materials, if necessary, can use phase conversion connector, through it to adjust the Angle measurement of sensor, the sensor zui greater received echo signal, and find the ideal points, realize the accurate measurement of material level.

Nine, use notice:

1, the meter used in outdoor, install the awning or protect box, lest time grew, LCD aging by sunlight.If used in the corrosive gas environment, need to install anti-corrosion coat, and outer casing and tighten the instrument into the outlet terminals.Where corrosive gas or liquid is used, or at the beach, sea use, need to choose anti-corrosion type.

2, wire, cable protection tube, pay attention to the seal to prevent water, to prevent rodent bite by rats, etc.

3. The instrument itself with lightning protection devices, but the instrument when used in dore region, Suggestions on the instrument into the outlet end of the other special installation of lightning protection devices.

4, instrument used in special hot and cold place, namely the ambient temperature may exceed the instrument work requirements, proposed around the liquid level meter high resistance, low temperature device.

5, ultrasonic probe and measured the level of vertical, within the scope of the ultrasonic launch cone cannot have other obstacles.

6, if the < - 20 ℃ or > + 60 ℃ temperature for use, please in advance in technology services around the world.

7, using the environment with dust, vapor, mist, liquid level bubble, floats, liquid mixing, waves, and so on and so forth, please in advance in the technical service department, all over the world need to discriminate.

Ten, parameter table:

Type no.	ZWS - 200 k (explosion-proof type)
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Amount of routine	Liquid: 0 ~ 15 m / 20 30 m/m/m solid: 40 0 ~ 6 m / 10 m/m / 15 to 25 m
Blind area	0~15m：0.6m；0~20m：0.8m；0~30m：1.2m；0~40m：1.5m
Precision (air)	The range of 0.2%
Output current	4~20mA
The output resolution	The actual range of 0.03%
The output load	Ω 0 ~ 500
Switch output	Highs and lows relay normally open
Relay specification	AC250V 5A／DC30V
Display resolution	lcm
Display mode	Four LCD (word 15 cm high) or six LED digital tube
The input power	DC24V (+ / - 10%), 80 ma, or 50 ma AC220V
Temperature compensation	Full range of automatic
Medium temperature	- 45 ℃ ~ + 85 ℃
Pressure range	±0．1MPa
The sound beam Angle	5°(3db)
Testing cycle	1 second
Parameter Settings	Three inductive buttons
Cable installation	PGl3.5 gland
Shell material	ABS
Sensor material	PVC
Protection grade	IP67
installation	Thread (flange) or fixed orifice (stent)
Installation requirements	Probe emission surface shall be installed out of container port

Eleven, selection of coding:

Note: if measured volatile liquid, please choose a big level model, solid level of effective range of the measurement is 1/2 to 2/3.

Description:

1, two wire series no 12 meters, 40 meters range models.

2, three-wire system series no 10 meters, 40 meters range models.

3, four wire series and split type standard no 10 meters range models.

4, thin no 12 meters, 40 meters range models.

Five, four wire and split type DC24V power supply products can provide LED digital tube display, all other products are LCD liquid crystal display (LCD).

Twelve, design selection and order notes:

1, the measured medium type.

2, medium temperature and pressure.

3, corrosive medium, if it's in the jar, material, need to know the jar have anti-corrosion lining.

4, whether to need to explosion-proof, anti-corrosion.

5, measuring range is a few meters.

6, connection mode: flange connection, threaded connections.

7, working environment, such as exposure, a cover plate of the pool, pool lie cans, cans, spherical tank, whether the jar with atmospheric pressure, etc.8, working voltage: 24 VDC.

9, output signal: 4 ~ 20 ma current.

After-sales service commitment:

1, our company sold by wei ultrasonic 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, if use, product quality assurance period appear quality problem, my company is responsible for the maintenance, charge damage parts cost.

5, households 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.