Everywhere in industry, electronic sensors are used to detect process values such as temperature, pressure or flow.
The ifm evaluation unit can be used to determine differential values in pressure, flow, level or temperature.
Process value monitoring often takes place directly in the sensor. However, sometimes separate monitoring devices are required – for example, if two measured values are to be offset against each other and the resulting value is to be monitored.
Evaluating measured values
The evaluation unit from ifm, which is designed for monitoring, analysis and offsetting two process values, is ideal for determining differential values in pressure, flow, level or temperature. It has various operating modes and two analogue sensors can be connected to the unit.
This means two switching points can be assigned to a measured signal, or a limit value can be assigned to two measured values. The two measured signals can be scaled and linked with each other using mathematical functions such as addition or subtraction.
The process value calculated in this way can be monitored with up to two switching points and can be output as an analogue signal (4...20 mA).
Measured values can be transmitted digitally to a higher-level controller via IO-Link. The device’s extensive parameter setting is also conveniently carried out via IO-Link.
A clearly visible OLED display shows the values and parameter settings.
Application cases
In an application case – for example – providing for differential pressure measurement on filters in an industrial plant, two pressure sensors measure the pressure before and after the filter. If the filter becomes clogged over time, the differential pressure increases.
In another application case, the ifm evaluation unit is used to monitor pressure measurement in a fermentation tank. In addition to the hydrostatic pressure at the bottom of the tank, the pressure of the gas above the medium, which increases as a result of fermentation, is measured. This measure is subtracted from the hydrostatic pressure to determine the level.
For more information visit: http://www.ifm.com
