Gestra LRS1-50 Blowdown Controller 24v
The conductivity switch LRS 1-50 in conjunction with conductivity electrodes LRG 1.-.. is used as a limit switch, for instance in steam boilers, (pressurized) hot-water installations, and condensate and feedwater tanks. The conductivity switch detects and indicates a MIN and a MAX conductivity limit.

The conductivity switch LRS 1-50 can be used in combination with the following conductivity electrodes: LRG 12-1, LRG 16-4, LRG 16-9, LRG 17-1, and LRG 19-1.

The conductivity controller LRS 1-50 in conjunction with the conductivity electrode LRG 16-. measures the electrical conductivity in conductive liquids. The conductivity electrodes LRG 12-1, LRG 16-4, LRG 17-1, or the LRG 16-9 with integrated resistance thermometer for detecting the fluid temperature can be used with the conductivity switch.

When connecting the conductivity electrode LRG 16-4 a reference measurement is taken and by setting the correction factor CF accordingly the conductivity readings are adapted to the specific conditions of the installation.

If the conductivity electrode LRG 16-9 is used, not only the electrical conductivity but also the water temperature will be measured. The conductivity readings can then be referenced to the standard reference temperature of 25 °C and the conductivity value will be automatically compensated for temperature

For this purpose, the water temperature is constantly measured by the conductivity switch and the conductivity reading is automatically compensated as a function of the adjusted temperature coefficient Tk (%/°C). Even if the temperature changes, thanks to the adjusted linear temperature compensation, the measured value is referenced to 25 °C over the whole measuring range and indicated on the 7-segment LED display.

The MAX/MIN limits can be variably adjusted within the measuring range

When the MIN or MAX limit is reached, the MIN or MAX output contact is switched over and MIN or MAX LED is illuminated. The equipment will be reset once the value passes outside the preset hysteresis.

Any faults or malfunctions in the conductivity electrode, the electrical connection, or the settings will be indicated by the 7-segment LED display. In the event of a malfunction, a MIN and MAX alarm will be triggered.

If an error occurs in the conductivity switch LRS 1-50, MIN and MAX alarms are raised and the system is restarted

Parameter settings can be changed or a MIN/MAX alarm be simulated by operating the rotary button.

The electrical conductivity is measured in μS/cm. In some countries, ppm (parts per million) is used instead. Conversion: 1μS/cm = 0.5 ppm. The conductivity switch can be adjusted accordingly.