ABOUT
"Our desire is to offer electromechanical components manufactured with the most modern technology and raw material. For this we have a center of excellence, a factory that follows the highest standards worldwide, manufacturing components that serve customers around the world.Being all over the world, we rely on the recognition and certification of the most respected certifying bodies of the industry, plus the trust of thousands of customer around the world."https://www.lefoogroup.com/
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LEFOO is a professional pump manufacturer supplying reliable pump components to equipment manufacturers worldwide.
Our pumps are designed for reverse osmosis systems, water purification, food & beverage equipment, RV & marine systems, and automotive applications.
Diaphragm Booster Pumps · Peristaltic Pumps ·BLDC Circulation Pumps · On-demand Pump·Custom Pump Solutions
CONTACT
Company: Lefoo Industrial Co., Ltd / Zhejiang Lefoo Sensing Technology Co., Ltd
Address: No.118, Changda Road, Linping District, Hangzhou, Zhejiang, 311100 China.
Contact: Cindy Wei
Email: lefoogroup@lefoo.com
Phone: +86-19818326550
Wechat: +86-19818326550
WhatsApp: ++86-19818326550
Fax: +86-571-8936-3678

LEFOO WATER PRESSURE TRANSMITTER
Digital Drinking Water pressure sensors are frequently used for inlet and outlet water pipe pressure measurement in clean water systems at public utilities.
Small Size Water Pressure Transmitter LFT221
The LFT221 water pressure transmitter is a cost-effective civilian product, mainly using for water treatment industry, with the characteristics of small size, lightweight, compact structure, and good ...
LEFOO WATER PRESSURE SENSOR AND WATER PIPE PRESSURE MEASUREMENT
Water pipe pressure sensors are frequently used for inlet and outlet water pipe pressure measurement in clean water systems at public utilities. Some water systems are fed by the gravity flow of the water, usually, lift stations pump the water to a higher elevation to provide reliable gravity flow. Water pressure in the pump well, water tower needs to be monitored by a water differential pressure sensor to control the predetermined water flow rate at the pump input, which turns off the pump at a minimum flow rate to prevent empty run damage. Also, pump well and water tower that undergoes a large release of water require water supplement. Pressure sensors for water pumps offer reliable pressure measurement for the pump and the observer can determine when to adjust additional pressure and flow by the measured values.
A drinking water pressure sensor is generally placed in a position such as:
The water input side of the drinking water pressure sensor
Pump output side
Clean end location (pump wet well, elevated pipe...)
In Lefoo, pressure transmitter manufacturer, there is an important part of digital water pressure sensor selection is ensuring that any electronic transducer transmitter used is compatible with potable water. Pressure transducers are responsible for monitoring the pressure, at various locations throughout clean water systems and often interface with pumps to show, when increased pressure or flow rates are necessary.
HOW TO SELECT A DRINKING WATER PRESSURE TRANSDUCER
Water pressure transducers can measure pressure in several different ways:
- Absolute pressure VS gauge pressure vs Differential pressures
Absolute water pressure is measured against vacuum or pressure-free.
Gauge pressure measures water pressure under atmospheric pressure. A vent tube is used to allow air to enter the sensor. The vent line can often be run through the power cable supplying the drinking water pressure sensors.
Differential pressures show the difference between inlet and outlet close to the pump with differential pressure sensor hvac, or in two water towers, or two water pipes. You can use differential pressure sensor to measure pressure drops across filters or measure flow rates by measuring the difference in pressure across a restriction.
- Technology of water pipe pressure sensor
In Lefoo, Water pressure sensors or transducers apply an oil-extended silicon unit, the unit contains a crystal chip made of diffused silicon, which bends as pressure is applied and generates electrical power. There is a diaphragm close to strain Wheatstone Bridge, which changes its resistance on 4 lines when force is in contact. This Wheatstone Bridge is used to modify the output voltage of the drinking water pressure sensors. Some pressure sensor for water pump provide zero-based outputs, the zero pressure occurs when no actual flow happens. When water flows through the sensor it will generate voltage signals.
HOW DOES DIGITAL WATER PRESSURE SENSOR WORKS FOR SEWAGE TREATMENT?
The sewage water is the wastewater used by the community. It is black or grey water and has a foul smell. In order to clean the wastewater from contaminants, we perform the sewage treatment using a water pipe Pressure Sensor for Sewage Treatment.
Therefore, to remove these contaminants, different chemical processes take place. The three process steps of Sewage treatment are:
Primary Treatment (temporary holds the sewage, the settled and floating particles are removed and then released for secondary treatment)
Secondary Treatment (to remove dissolved and suspended biological matter)
Tertiary Treatment (final cleansing process)
Fourth Treatment Stage: water pipe pressure sensor for sewage treatment
Digital water pressure sensor for water pumps: Sewage Treatment Steps?
The sewage treatment procedure includes the following step;
Methods to treat sewage by digital water pressure sensor:
The four common methods to treat sewage are:
Physical Water Treatment
Biological Water Treatment
Chemical treatment
Sludge Treatment
Use of Water Pipe Pressure Sensor for water pumps:
We use water pipe pressure sensors for measuring the pressure of gas or liquid and variables such as the flow of liquid or gas, speed, water level, and elevation.
A water pipe pressure sensor is an electronic device. We also use it to detect, regulate, and monitor pressure. In addition, it converts pressure into an analog electrical signal.
Moreover, the pressure sensor converts the perceived data into an electronic signal.
TECHNOLOGIES USED BY WATER PRESSURE SENSOR FOR WATER PUMPS SEWAGE TREATMENT.
There are 6 major technologies used by pressure sensors for sewage treatment:
Potentiometric pressure sensors
Inductive pressure sensors
Capacitive pressure sensors
Piezoelectric pressure sensors
Strain gauge pressure sensors
Variable Reluctance pressure sensors
LEFOO PIEZOELECTRIC WATER PIPE PRESSURE SENSORS:
These water pipe pressure sensors rely on the ability of the materials. Also, their purpose is to generate an electrical potential when you subject the material to mechanical stress. We call this process the piezoelectric effect.
Water Pipe Pressure sensors are of four types;
Aneroid Barometer Sensors
Manometer Sensors
Bourdon Tube Pressure Sensors
Vacuum Pressure Sensors
Water pipe pressure sensors, or water pressure transducers produced by LEFOO company, are used in residential, and commercial clean water distribution utilities for water elevated piping pressure measurement. The inlet and outlet water Pipe pressure measurement in water treatment facilities and water purification industries is very important, in the wastewater treatment industry, the measurement of water flow is also vital. The water pressure transducer is also applied in irrigation systems. LEFOO offers various pressure sensors and transducers with excellent accuracy and long-term stability. There is some basic information in this content to review before making a decision on the type of pressure sensor required.
WATER PIPE PRESSURE SENSOR TECHNOLOGIES USED TO NEUTRALIZE WATER?
The modern manufacturing process relies partially on water. On the elementary level, water is essential to turn raw materials into basic manufacturing resources. Furthermore, water is also required to clean, combine and transform them into daily life products.
During the process, water becomes wastewater due to its exposure to contaminants so it has to go through other rigorous treatments before you release it into natural reservoirs.
Moreover, most of the Industrial factories are now doing on-site treatment of wastewater to cut the costs, and to recycle it back to the manufacturing process.
Moreover, the wastewater cleaning process is based on multiple steps. This process cleanses water from harmful bacteria, chemicals, organic and inorganic compounds of water.
Following are the technologies used to neutralize water and to remove impurities from water;
Reverse Osmosis System
Ultrafiltration System
Vacuum Evaporators
Vacuum Filters
Paper bed Filters
Solid Bowl Centrifuges
Tramp Oil Separators
Types of Instruments Used for Sewage Treatment:
To treat waste water the Industrial manufacturers used the 4 types of basic instruments;
Level Instruments
Flow Instruments
Water Quality Monitoring Instruments
Pressure Instruments
Level Instruments:
We use level instruments to maintain liquid and gas levels in pipes, tanks or silos in wastewater treatment systems.
Usually, treatment pipes are difficult to access because they are opaque so the system operators depend on level radar, sensors, and transducers to monitor the level of water.
In addition, switches are normally connected with the alarms, pumps, or controllers to adjust the incoming flow of water and gas.
Flow Instrument:
Flow instruments are used for two main purposes:
To determine the amount of gas or liquid present in the pipe.
To check the rate at which the gas or liquid is moving through the vessel.
The flow instruments are installed inside the treatment pipes. They measure the volume and mass of gas or liquid at consistent time intervals.
The flowing instrument might be;
Variable area meter
Mechanical flowmeters
Magnetic flowmeters
Thermal flowmeters
And, pressure-based meters.
Pressure Instruments:
Pressure Instruments include;
Transmitters
Sensors
Transducers
Gauges
It is possible to install pressure instruments on the inside of the waste treatment pipes, pumps, and reservoirs.
In addition, these pressure instruments help industries to maintain safe pressure levels and also prevent equipment failure.
Water Quality Monitoring Instruments
These instruments are integral for industrial wastewater treatment. Water also needs to pass the national and local cleanliness standards to be released in the sanitary sewers.
To measure the treatment process, you need to install the water quality instruments inline. The type of meter required per phase depends on the testing environment.
The system in question is also a matter of concern in this regard.
MORE CUSTOM PRESSURE SENSORS SOLUTIONS
Refrigeration pressure sensor: Refrigeration systems often encounter with latent facility faults and inefficient temperature management.
Flat pressure sensor: Flat pressure sensors are widely used in a variety of industries such as petrochemical, water purify ink, paint, mud and Dairy products with a certain possibility of viscous measurement.

LEFOO DIFFERENTIAL PRESSURE TRANSMITTER
LEFOO differential pressure sensor hvac at the pressure ranges of 0~±100Pa, 0~±1,000Pa, and 0~±10,000Pa.LCD digital display 25+ years manufacturing Expert, Contact LEFOO to get the Best differential pressure transmitter price
Air Differential Pressure Transmitter
Pressure Range: ±100Pa, ±1000Pa, ±10000Pa
Accuracy: ±1%F.S.
Output Siginal:4~20ma,0~5VDC/0~10VDC,
RS485,4~20ma/0~10VDC
Power Supply: 16~30VDC
Monocrystalline Silicon Differential Pressure Transmitters
Pressure Range: 0.2-6kPa, 1-40kPa, 2.5-250kPa,
10-1000kPa,30-3000kPa
Accuracy: 0.1%F.S.,0.075%F.S.,0.05%F.S.
Output Siginal:4~20ma HART
Differential Pressure Gauge
Pressure Range: 0-30Pa, -30-30Pa, 0-60Pa,
0-125Pa,-125-125Pa,0-250Pa,-250-250Pa,
0-300Pa,0-500Pa,0-750Pa,0-1kPa,0-2kPa…
Accuracy: ±2%F.S.
Working Temperature:-7-80℃
LEFOO DIFFERENTIAL PRESSURE TRANSMITTER MODELS AND SPECIFICATIONS
Versatile LFM108 differential pressure transmitter ranges from 0~ +50 Pa to 0~ +10 KPa. And customized 34 kpa measuring span is available (HVAC compressor with hvac differential pressure sensor, low-pressure end of gas energy industry ).
Digital differential pressure transmitter LFM31 with buttons and display is employed for measuring system air pressures, which is available for the user to select appropriate options when observing environmental air pressure changes, Versatile LFM32 Air pressure transmitters are available with the compound version of the outputs signal. While LFM30 is only available for one type from 0~5V,0~10V, 20ma, or RS485.
The differential pressure transmitter uses the piezoresistive effect of the conductor silicon material of the differential pressure sensor/transducer to realize the conversion between the differential pressure and the electrical signal.
The low differential pressure transducer made by LEFOO pressure control is ideal for the application of monitoring the vacuum pressure, a gauge pressure of air with differential pressure, such as natural gas, and especially low pressure of non-corrosive gases.
DP 810 Differential pressure transmitter is capable of pressure measurement for media such as liquid, solution, oil, glue, chemicals, petroleum gas.
ADVANTAGES AND INSTALLATION FLEXIBILITY OF LEFOO TRANSMITTERS
High exactness and long stability are vital for an energy-efficient, well-functioned air ventilation system. As one of leading differential pressure transmitter suppliers, LEFOO comes in different models where the most advanced models help you save installation time and cabling through quick and easy assembly steps, which features as below:
- One air differential pressure transmitterinstead of two! Each transmitter holds two pressure inputs. High exactness measurement. High water-resistance functions. Lightning protection.
- Easy installation, there is plenty of space in the cover and that it is easy to access the wiring.
Vertically or horizontally, No need to worry about placement or hassle during installation. LEFOO differential pressure transmitters have mounts, which gives you great flexibility.
If you want to know more kinds of pressure differential monitor, please visit our website.

LEFOO 300 GPD RO PUMP
300 GPD Pump / Pressure Booster Pump / Self-Priming Pump
Work Flow: 2.6L/min or 2.7L/min
Work Pressure: 0.5Mpa=70Psi
Noise Level: ≦53db / ≦55db
Max Current: ≦3.2A / ≦4.5A
Transmitter
RO booster pump 300 GPD
Self-priming RO Booster Pump 300 GPD
The Self-priming RO booster pump 300 GPD has the benefits of Low cost and robust quality, the pump has a self-priming height of 3 meters while boosting pressure to the water.
LEFOO Offering Diaphragm Booster Pumps, Water Booster Pumps for reverse osmosis systems and water purifiers, and water pressure feeding applications since 1985. 300 GPD pump can increase the pure water production rate for all Solid Filter Cartridges in Water Purifiers and reduce the rejection water rate. The 300 GPD pump can also maintain a stable long-term pressure of 70 psi. The ro water pump is quiet with workflow ≧2700ml/min. The 300 GPD pump is ideal for water purifiers in kitchens, offices, and shops.
If you want to know more kinds of differential air pressure sensor, please visit our website.