High Temperature & High Pressure level measurement, SIRD-705 GWR Level Sensor is a good choice. The highest pressure reaches 40MPa, and the highest temperature reaches 400℃.

high temperature liquid level sensor

The high temperature and high pressure guided wave radar level sensor is specially designed for high temperature and high pressure occasions. The product is mainly used for liquid level measurement on various boiler drums. Has high safety and accuracy. The highest rated pressure reaches 40MPa. The highest rated temperature reaches 400℃. It is suitable for high and low pressure heaters, condensers and deaerators in thermal power plants. As well as for liquid level measurement under high temperature, high pressure, vacuum and other steam conditions.

Sino-Inst offers a variety of Guided wave radar Level Sensors for industrial high temperature and high pressure level measurement. If you have any questions, please contact our sales engineers.

Features of GWR High Temperature Liquid Level Sensor

GWR Level Sensor has the advantages of low maintenance, high performance, high precision, high reliability and long service life. Compared with contact instruments such as capacitors and heavy hammers, it has unparalleled advantages.

The transmission of microwave signals is not affected by the atmosphere. Therefore, it can meet the requirements of harsh environments such as volatile gases, high temperature, high pressure, steam, vacuum and high dust in the process.

GWR Level Sensor is suitable for harsh environments such as high temperature, high pressure, vacuum, steam, high dust and volatile gases. It can continuously measure different material levels.

The main technical indicators of GWR Level Sensor meet or exceed similar products at home and abroad. It is easy to install and debug. It can be used alone or in a network. It can be widely used in metallurgy, building materials, energy, petrochemical, water conservancy, food and other industries.

GWR Level Sensor measurement advantages:

  • It has a strong ability to suppress steam and foam, and the measurement is not affected;
  • Not affected by liquid density, loose degree of solid material, temperature, and dust during feeding;
  • Low maintenance, high performance, high precision, high reliability and long service life.

Specifications of SIRD-705 GWR Level Sensor for High Temperature & High Pressure

Suitable for Medium: Liquids, especially high temperature and pressure environment of liquid
Application: Sealed tanks, high pressure liquid measurement 
Explosion-proof Grade: Exia IIC T6 Ga/Exd IIC T6 Gb  Measuring 
Range: 15m 
Frequency: 500MHz-1.8GHz
Antenna: Single cable or single rod antenna 
Accuracy: ±10mm
Process Temperature:(-200~400)℃
Process pressure:(-0.1~40)MPa
Signal output:(4~20)mA/HART
The Scene Display: Four LCD/Can be programmed
Power Source: Two-wire (DC24V) 
Shell: Aluminum /Plastic
Connection:  Thread / Flange (optional)

GWR Level Sensor for High Temperature & High Pressure Applications

SIRD-705 GWR Level Sensor is suitable for measuring liquids with high pressure in sealed tanks, especially liquids in high temperature and high pressure environments.

It is suitable for high-pressure bubble water level measurement in power plants, liquid ammonia measurement, and liquid level measurement in chemical fertilizer synthesis ammonia process.

GWR Level Sensor for High Temperature & High Pressure Applications

Advantages of using guided wave radar level sensors on boilers

Guided wave radar level sensor is often used in industrial production. Because of its superior performance, it is accepted by the public. It has the advantages of low maintenance cost, strong detection performance, accurate measurement accuracy, high safety, and long service life. The signal emitted by the device is not affected by the environment, atmosphere. So it can be used in a variety of special media, such as high temperature, high pressure, steam state, volatile gas, dust, vacuum environment, etc.

guided wave radar level sensors in boilers
Guided wave radar level sensors in boilers

Today I want to share with you how to use the guided wave radar level sensor in the boiler. The high temperature and high pressure in the boiler need to use the level sensor to measure the internal liquid level to ensure its safety. The use of guided wave radar level sensors can solve the difficult problems of safety, accurate readings, and simple maintenance.

On some boilers, each boiler installation requires at least two independent water level sensors. Therefore, each boiler also needs to be equipped with two guided wave radar level sensors. Only in this way can the safety requirements for boiler operation be fully met. Guided wave radar level sensors need to use quartz tubes to observe changes in the liquid level in the furnace. However, the connecting pipes and valves need to be opened to improve the accuracy of detection. It is necessary to ensure that the probe and sensor are dry and clean during installation. If contamination occurs, it can not be wiped with a wet towel, and alcohol must be used for decontamination.

Although many cities do not yet have standard regulations on boiler level sensors. At least one intuitive level sensor must be installed, together with a guided wave radar level sensor for observation. If it is a large and complex complete set of boiler equipment, it is necessary to redesign and plan the guided wave radar level sensor and install it according to the design drawing.

If you need to measure river water level, open channel level, etc. The Ultrasonic Liquid Level Sensor can be used for non-contact continuous level monitoring.

Boilers usually use at least 2~3 sets of liquid level display systems according to their different sizes and uses. The selection of Level Transmitter is also different according to different requirements.

  1. Direct liquid level display. The purpose is to observe the liquid level most intuitively. Commonly used plate level gauges, two-color level gauges, and magnetic flap level gauges are also commonly used on low-pressure and small-tonnage boilers;
  2. Control Level Transmitter. It is used for automatic control signals. Usually a balance chamber is used to match a differential pressure transmitter. Immersion float level gauges are also commonly used. This type of level gauge requires the measurement principle to be directly related to the density of the medium to avoid boilers False liquid level effects;
  3. Level Transmitter for safety. Electric contact water level gauge is mostly used. Its characteristic is to indicate the liquid level point by point. The points are not related to each other. Breaking a few points does not affect the display of other points. The reliability is extremely high.

The Non Contact Liquid Level Sensor is not in contact with the measured medium. The Non Contact Liquid Level Sensors provided by Sino-Inst is not Gravity Non-contact Liquid Level Sensors. It is the liquid level sensor used in industrial tanks, reservoirs, and open channels. There are mainly ultrasonic level sensors and radar level sensors.

Non Contact Liquid Level Sensor

The measurement temperature of most Ultrasonic Level Sensors currently on the market is -20 to +80°C.

So, can Ultrasonic Level Sensor measure high temperature and high pressure?
The answer is no.

One customer was affected by high temperature using E+H Ultrasonic Level Sensor.

The ultrasonic level gauge can measure when the water surface is close to the probe, but cannot measure when the water surface is far from the probe. When the water temperature is low, the ultrasonic level gauge measures normally, but when the water temperature is high, the ultrasonic level gauge cannot measure. This is the measurement of the high temperature inside the pool or tank on site that affects the ultrasonic level gauge.

The reason why the E+H ultrasonic level gauge has this problem is that the liquid medium generally does not produce steam and mist below 30-40 °C. Above this temperature it is easy to generate steam or mist.

The ultrasonic wave emitted by the E+H ultrasonic level gauge will attenuate once as it passes through the steam during transmission. Attenuates again when reflected back from the liquid surface. As a result, the weak ultrasonic signal returns to the probe at the end and cannot be measured.

Moreover, in this environment, the probe of the ultrasonic level gauge is prone to form water droplets. It will hinder the transmission and reception of ultrasonic waves.

To solve this problem, we can have the following two operation options:

  1. To increase the measurement range, the height of the water tank is actually 3 meters. The E+H ultrasonic level gauge between 6 meters and 9 meters should be selected. The effect of steam or fog on the measurement can be reduced or reduced.
  2. The probe of E+H ultrasonic level gauge should be made of polytetrafluoroethylene or PVDF. Physically sealed. In this way, water droplets are not easy to condense on the emitting surface of the probe. As for the emitting surface of other materials, water droplets can easily condense.

High Temperature Level Switch refers to a liquid level switch that can measure and control liquid level under high temperature conditions.

High temperature float switches provide consistent and reliable switching points in high temperature and other extreme applications. These sensors are made of durable stainless steel floats that slide on stainless steel stems.

As the float moves over the heat-resistant internal switch, its built-in magnetic field activates the reliable switch.

The high temperature level switch can be mounted on the top of the tank, on the side of the tank, or from the bottom of the tank.

There is also a tuning fork level switch. Features of compact tuning fork level switch:

The temperature can reach 150 ℃, and it is used for general liquid level measurement at higher temperature.

Extended Reading: Case: High Temperature Radar Level Transmitter for Melted Salt-Solar Photovoltaic Power Station

Float Type Level Switches

SI-U01 Float Level Sensor
SI-U02 Multi-Point Liquid Level Float Switch
SI-U03 Float Switch Water Level Controller
SI-U04 Magnetic Float Level Sensor-Reed Switch
SI-U05 Cable Float Level Sensor & Swtich

Continuous Level Sensor Series

Continuous level sensors are transmitters that measure liquids within a specified range. Level sensors determine the exact amount of liquid that provides a continuous analog signal. The level signal can be displayed directly on site or integrated into a process control or management system. These products can be installed vertically and horizontally. They are ideal for monitoring liquids in confined or restricted areas.


Common liquid level sensors are:
Float type liquid level sensor, magnetostrictive liquid level sensor,
Capacitive liquid level sensor, resistance liquid level sensor,
Radar level sensor, laser level sensor,
Ultrasonic liquid level sensor, pressure sensor,
Bubble level sensor, isotope level sensor,
Thermodynamic liquid level sensor
Therhere are 7 main types of level transmitters that Sino-Instroffers. Each type of transmitter works in a different way, and makes it useful for different types of processes.
More about level sensors from Wikipedia.

The liquid level sensor is a pressure sensor that measures liquid level. The static pressure input type liquid level transmitter is based on the principle that the measured liquid static pressure is proportional to the height of the liquid. It uses an isolated diffused silicon sensor or a ceramic capacitive pressure sensitive sensor to convert the static pressure into an electrical signal. Temperature compensation and linear correction are converted into standard electrical signals (usually 4~20mA/1~5VDC)

Float level sensor: Float level sensor is designed and produced based on the principle of buoyancy and static magnetic field. The position of a floating ball with a magnet (floating ball for short) in the measured medium is affected by buoyancy. The change of the liquid level causes the position of the magnetic float to change. The role of the magnet and sensor (reed switch) in the floating ball changes the number of components (such as fixed resistance) connected in series to the circuit. Thereby changing the electrical quantity of the instrument circuit system. That is, changes in the position of the magnetic float cause changes in the electrical quantity. The change of the electrical quantity is detected to reflect the liquid level in the container.

Sino-Inst offers over 10 Guided Wave Radar level transmitters for level measurement. About 50% of these are Radar level meters, 40% is the tank level sensor.

A wide variety of Guided Wave radar level meters options are available to you, such as free samples, paid samples.

Sino-Inst is a globally recognized supplier and manufacturer of Guided Wave radar level measurement instrumentation, located in China.

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