Working principle

SP-LDE series fire pump flowmeter, tap water inlet flowmeterBased on Faraday's law of electromagnetic induction. The measuring tube of the flowmeter is a non-magnetic alloy short tube lined with insulating material. Two electrodes are fixed on the measuring tube by passing through the tube wall along the diameter direction. The electrode tip is basically flush with the inner surface of the lining. When the excitation coil is excited by two pulse waves, a working magnetic field with a magnetic flux density of B will be generated in the direction perpendicular to the axis of the measuring tube. At this point, if a fluid with a certain conductivity flows through the measuring tube. Induce an electromotive force E by cutting the magnetic field lines. The electromotive force E is proportional to the magnetic flux density B. Measure the product of the inner diameter d of the tube and the average flow velocity v. The electromotive force E (flow signal) is detected by the electrode and sent to the converter through a cable. After amplifying and processing the flow signal, the converter can display the fluid flow rate and output signals such as pulses and analog currents for flow control and regulation.

Product Category:

Composed of sensors and intelligent signal converters, it can be divided into two types of structures based on the assembly form of the converter and sensor: integrated and split.

Integrated: The converter and sensor are directly assembled as a whole and cannot be separated. Commonly used in sites with good environmental conditions.

Split type: The converter is composed of a dedicated cable and a sensor to form a product, with the sensor installed on site and the converter installed in a location with better conditions. Commonly used in sites with poor environmental conditions, such as underground wells, high temperatures, and places that are difficult for personnel to reach.

How to choose protection level

According to the national standard GB4208-84 and the International Electrotechnical Commission standard IEC529-76 regarding the protection level of enclosures, the standard is:

IP65: Anti spray type, allowing the faucet to spray water on the sensor from any direction, with a spray pressure of 30KPa, a water output of 12.5L/s, and a distance of 3 meters.

IP68: Submersible type, capable of long-term operation in water.

The protection level should be selected according to the actual situation. The sensor should be installed below the ground. If it is frequently flooded, IP68 should be selected. When the sensor is installed on the ground, IP65 should be selected

How to choose additional features

The basic model comes with display, 4-20mA output, and 0-1kHz alarm functions. Other additional functions can be added according to the actual situation.

Split installation: If the sensor needs to be installed below the ground or for other reasons, a split installation method should be chosen.

RS-485 communication: If communication between sensors and other devices is required, RS-485 communication function should be selected.

Suitable for precise and stable measurement of instantaneous flow rate, cumulative flow rate, and flow velocity of conductive liquids and slurries in closed pipelines, such as clean water, sewage, domestic water, and raw water. Solutions of various acids, bases, salts, etc., such as sulfuric acid, hydrochloric acid, nitric acid, etc. Mud, silt, slurry, pulp, lime slurry. Liquids related to food are widely used in industries such as metallurgy, papermaking, water treatment, chemical, light industry, textiles, food and beverage, catering, agricultural irrigation, hydropower stations, oil fields, electricity, and mining.

Functional features:

High precision, good stability, not affected by changes in the temperature, pressure, density, viscosity, and conductivity of the measured liquid.

The sensor has a simple structure, no throttling device, no blockage, and is suitable for measuring liquids containing solid particles, fibers, and suspended solids.

There are multiple options for liquid contact materials, which can be used for measuring various corrosive liquids.

◆ It can be installed horizontally, vertically, or diagonally, as long as the measuring tube is filled with liquid and free of bubbles.

The measurement range is wide, with a ratio of 100:1, and the range can be modified.

On site zero calibration is possible without affecting measurement accuracy.

Low power consumption, less than 7W.

LCD displays instantaneous flow rate, cumulative flow rate, flow percentage, fluid flow rate, and fault alarm.

◆ Chinese menu, parameters can be viewed and modified according to prompts, and the four button functions can be set by the software at any time, making it easy to learn.

◆ Fault self diagnosis, which can realize air traffic control judgment alarm, excitation fault alarm, over range alarm, and output signal fault alarm.

◆ It can accumulate forward traffic, reverse traffic, and bidirectional traffic difference.

◆ Automatic conversion of measurement units and decimal places.

◆ High explosion-proof rating, explosion-proof mark Exd (ia) iaq Ⅱ CT6.

Multiple signal output options include 4-20mA, 0-11kHz, HART, RS485, etc.

◆ One click restore factory parameter settings.
Fire pump flowmeter, tap water inlet flowmeterSelection of lining

Fire pump flowmeter, tap water inlet flowmeterSelection of electrode material

Product spectrum of fire pump flowmeter and tap water inlet flowmeter