The LRS 1-50 conductivity switch is used in combination with LRG 1.-.. conductivity electrodes as a limit switch, e.g., in steam boilers and hot water installations or in condensate and
feedwater tanks. The conductivity switch indicates when a MIN and MAX conductivity has been reached. The LRS 1-50 conductivity switch can be combined in a circuit with the LRG 16-4 and LRG 16-9 conductivity electrodes.
Function
The LRS 1-50 conductivity switch, in conjunction with the LRG 16-. conductivity electrode, measures conductivity in conductive fluids. The conductivity electrode used is the LRG 16-4 conductivity electrode, or the LRG 16-9 with integrated resistance thermometer for monitoring the fluid temperature. When the LRG 16-4 conductivity electrode is connected, a reference measurement is taken and a correction factor CF or the CAL function is adjusted to adapt the conductivity measurement to the specific conditions of the installation. When the LRG 16-9 conductivity electrode is connected, the temperature of the water is measured as well as its conductivity. This enables the change in conductivity caused by rising water temperatures to be compensated and based on the standardized reference temperature of 77 °F (25 °C). To do this, the temperature of the water is measured in the conductivity switch and the conductivity reading is automatically compensated as a function of the adjusted temperature coefficient tC (%/°C). If the temperature changes, thanks to linear temperature compensation the reading is referenced to 77 °F (25 °C) over the entire measuring range, and indicated as an actual value on the 7-segment LED display.
The MIN/MAX limits can be varied as desired within the measuring range.
If the MIN or MAX limit is reached, the MIN or MAX output contact switches and the MIN or MAX LED lights up. It switches back when the value is above or below the preset hysteresis. Faults in the conductivity electrode or electrical connection and setting errors are shown on the 7-segment LED display. In the event of a malfunction, the MIN and MAX alarm is triggered. If faults occur only in the LRS 1-50 conductivity switch, the MIN and MAX alarm is triggered and the system is restarted. Parameters can be changed and the MIN/MAX alarm simulated by turning the rotary knob. Electrical conductivity measurement is set to µS/cm as default. In some countries, ppm (parts per million) is used as well. Conversion 0.5 ppm= 1 µS/cm. You can set the conductivity switch to the required unit
