11
LRS 1-50 - USA - Installation & Operating Manual -
850704-01
The
LRS 1-50 conductivity switch
, in conjunction with the LRG 1.-.. 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 1.-.. conductivity electrode
is connected, a reference measurement is taken and
a correction factor
CF
is adjusted to adapt the conductivity measurement to the specific condi-
tions of the installation.
When a resistance thermometer 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 conduc-
tivity 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 is measured in µS/cm. In some countries, ppm (parts per million) is used as
well. Conversion 1 µS/cm = 0.5 ppm. You can set the conductivity switch to the required unit.
Safety information
The equipment may only be installed, wired and brought into service by qualified and competent
staff.
Fitting and maintenance work may only be performed by authorized staff who have undergone
specific training.
Function
