Conductivity measurement

Conductivity measurement is mainly used in the steam boiler for the control of boiler water and condensates. Limit values are set for the quality of the boiler water that is controlled by the conductivity measurement. If the water quality deviates from the limit value, the sensor notifies the system about the change, and the system will control, for example, the feeding of additional water into the steam boiler.

Energy saving as a goal

A correct dosing of the boiler water is important not only for the sake of internal order and minimised maintenance needs, but also, because with a functioning conductivity measurement an optimised blowdown capacity of water is achieved. In this case, a minimum amount of additional water is needed.

The conductivity measurement can be also used as an indicator of leakage, for example, in heat exchangers where two media with different conductivity are used. If there is a leakage in the heat exchanger and the media are mixed, the conductivity sensor gives immediately alarm in the system.

GESTRA LRG(T) conductivity sensors are available either with manual or automatic temperature compensation. The conductivity signal is mediated forward with an active transmitter (output signal 4–20 mA) integrated in the sensor or using a special amplifier where the communication between the sensor and the amplifier takes place in digital mode. The conductivity of the medium to be measured should be at least 0.5 µS/cm.

GESTRA also has a controller with conductivity sensor LRS 1-7a that can control a 3-way valve to remove the dirty condensate.