Versatile Systems for a Wide Range of Applications
Food industry
Food Industry
Fluid sensors detect foam and barrier layers, monitor cooling circuits and measure levels hygienically and precisely.
Electronics industry
Electronics Industry
Fluid sensors offer reliable solutions for controlling the temperature of a medium, protecting against dry running and detecting empty pipes.
Equipment manufacturing
Equipment Manufacturing
Fluid sensors can be used to detect leaks, control system pressure in pump systems and prevent tank overflows.
How Do Flow Sensors Measure Flow Velocity?
wenglor flow sensors measure the flow velocity of media using the calorimetric measuring principle. The sensor measuring probe is heated and cooled by the passing medium. The flow velocity of the medium is determined by comparing the heating temperature with the actual measured temperature. In addition, this measuring principle can also be used to record the temperature of medium.
Since the measurement process is significantly influenced by the thermal properties of the measured medium, wenglor flow sensors are calibrated for the medium water. When using alternative media, such as glycol-water mixtures or oils, there may be significant deviations in the measurement results due to the different thermal conductivities of the materials.
Since the measurement process is significantly influenced by the thermal properties of the measured medium, wenglor flow sensors are calibrated for the medium water. When using alternative media, such as glycol-water mixtures or oils, there may be significant deviations in the measurement results due to the different thermal conductivities of the materials.
Mounting Instructions for Flow Sensors
Due to the symmetrical design of the measuring element, flow sensors can be installed independently of the flow direction, allowing flexible mounting. However, optimal positioning of the measuring probe is crucial for maximum precision when recording the flow velocity:
The sensor should be oriented so that the measuring probe lies in the center of the pipe cross-section. This central alignment ensures that the flow velocity of the entire flow is captured and prevents distortions due to flow deviations on the pipe wall. This minimizes erroneous measurements, which can occur due to friction losses or turbulence near the wall.
The Following Must Be Observed when Installing Flow Sensors
Flow sensors must be installed in risers or closed systems, as the flow is steady and a reliable measurement of the flow velocity is possible. Flow deviations can occur in downpipes or pipes open at the bottom, resulting in inaccurate measured values. Installation in a closed system ensures that the measurement is not distorted by external influences or unstable flow conditions.
Installation in Downpipes
Installation in Risers
How Do Temperature Sensors Work?
Temperature sensors from wenglor measure liquids and gases in closed piping systems. The temperature change of the medium changes the resistance in the sensor. This change in resistance is detected and used to accurately determine the temperature of medium.
Both T100/PT1000 resistors and temperature transmitters are available for processing the output signal. The latter is a temperature sensor with evaluation and output of the measurement signals in analog and digital form.
Both T100/PT1000 resistors and temperature transmitters are available for processing the output signal. The latter is a temperature sensor with evaluation and output of the measurement signals in analog and digital form.
What Are Pressure Sensors?
wenglor pressure sensors measure the pressure of gaseous and liquid media. The pressure is defined as the force exerted on a unit area. Depending on the pressure applied, the membrane of the sensor deforms. This change is detected by resistances and displayed as a pressure value.
Pressure sensors also enable continuous fill level measurement, in which the current fill level is permanently recorded. They measure the hydrostatic pressure of a liquid that is proportional to the filling height (for water, 1 cm filling height corresponds to approximately 1 mbar pressure). With a pressure sensor at the bottom of a tank, the fill level can be precisely determined and monitored.
Pressure sensors also enable continuous fill level measurement, in which the current fill level is permanently recorded. They measure the hydrostatic pressure of a liquid that is proportional to the filling height (for water, 1 cm filling height corresponds to approximately 1 mbar pressure). With a pressure sensor at the bottom of a tank, the fill level can be precisely determined and monitored.
What Is the Difference Between Absolute and Relative Pressure?
Relative pressure | Relative pressure describes the pressure in a closed system compared to the ambient pressure. If the measured pressure is below the ambient pressure, this is referred to as partial vacuum. If the pressure is above the ambient pressure, it is called overpressure. |
|---|---|
Absolute pressure | Absolute pressure refers to the measured pressure compared to vacuum. However, most wenglor sensors measure the relative pressure in relation to the atmosphere. |
Can Pressure Sensors also Measure Temperature?
In addition to conventional pressure measurement, wenglor also offers pressure sensors with integrated temperature measurement. This allows two measurement variables to be recorded with just one sensor, saving space and costs. However, temperature measurement is subject to system-related limitations: Since the temperature sensor is located behind the ceramic pressure measuring cell, its reactions to temperature changes of the medium is damped. In addition, the self-heating of the sensor interior can influence the measured values. wenglor temperature sensors are therefore recommended for particularly precise temperature measurements.How Are Fill Levels Measured?
While pressure sensors can also be used for continuous level measurement, wenglor’s LevelTech sensors offer an additional solution for selective limit value detection.
What is selective fill level measurement?
With selective fill level measurement, the presence of a medium at a specific point in the tank is detected. The LevelTech sensors enable a distinction to be made between several media such as liquids, foam formations, pastes and granules, so that only the level of the relevant measuring medium is recorded. Frequency-stroke technology is used here: The electrode at the sensor tip together with the environment forms a capacitor, the capacity of which is influenced by the medium to be detected. A coil integrated in the sensor electronics generates a resonance circuit, the resonance frequency of which is measured. Depending on the set limit value, the switching output is activated. This measuring method is suitable for fill level detection of liquids as well as pasty, sticky or solid media such as granules.
With selective fill level measurement, the presence of a medium at a specific point in the tank is detected. The LevelTech sensors enable a distinction to be made between several media such as liquids, foam formations, pastes and granules, so that only the level of the relevant measuring medium is recorded. Frequency-stroke technology is used here: The electrode at the sensor tip together with the environment forms a capacitor, the capacity of which is influenced by the medium to be detected. A coil integrated in the sensor electronics generates a resonance circuit, the resonance frequency of which is measured. Depending on the set limit value, the switching output is activated. This measuring method is suitable for fill level detection of liquids as well as pasty, sticky or solid media such as granules.
Overview of Technology Advantages
Fluid sensors are used in a wide range of areas where precise measurements of process variables such as flow, temperature, pressure and fill-level are required. They provide reliable and fast recording of these parameters to enable effective process control. With flexibility in installation and easy integration into existing systems, they help increase efficiency and optimize workflows. Different functional principles and associated advantages enable a wide variety of applications that meet a wide range of requirements.
