Description
The conductivity switch LRS 1-7 in conjunction with the conductivity electrode LRG 16-9 constitutes a conductivity monitoring and control system. The electrical conductvity of
n Condensate,
n Boiler feedwater,
n Cooling and cleaning water,
n Boiler water
is monitored. In steam boiler plants the conductivity monitoring & control system is used as limit switch and continuous
blowdown controller.Technical Data
Type approval
TÜV.WÜL.xx-014
Supply voltage
230 V, +10/–15 %, 50-60 Hz
115 V, +10/–15 %, 50-60 Hz (option)
Input
1 Input for conductivity electrode LRG 16-9
Output
3 volt-free relay contacts, max. contact rating for switching
voltages 115 V AC and 230 V AC: resistive/inductive 4 A.
Provide contactor with interference suppressor
(RC combination). Contact material: AgNi 0,15.
1 Current output 4-20 mA as actual value output, max.
load 500 ?
Measuring range
0.5 to 10000 µS/cm at 25 °C or
0.25 to 5000 ppm at 25 °C.Setpoint
adjustable between 0.5 and 9999 ?S/cm or
0.25 to 5000 ppm
MAX limit
adjustable between 0.5 and 9999 ?S/cm or
0.25 to 5000 ppm
Correction factor
adjustable between 0.05 and 5,000, adjustable in
increments of 0.001
Temperature coeffizient Tk
0.0 – 3.0 % per °C, adjustable in increments of 0.1
Actual value output
4 mA corresponds to 0.5 ?S/cm
20 mA corresponds to 10, 200, 500, 1000, 6000,
9999 ?S/cm or 5, 100, 250, 500, 3000, 5000 ppm,
final values adjustable
Purging interval
(continuous blowdown valve is forced to open)
adjustable between 1 h and 24 h in increments of 1 h.
Duration of purging
adjustable between 1 min. and 6 min. in increments of 1
min.
Switching hysteresis
Controller output: – 10 % of the adjusted setpoint W,
Limit MAX: – 3 % of the adjusted MAX limit
Indicators and adjustors
1 four-digit, seven-segment indicator, red, for indicating
the actual value / setpoint and for status and error messages
2 amber LEDs for indicating actual value (X) / setpoint (W)
1 red LED for indicating MAX limit
2 green LEDs for indicating valve OPEN / CLOSED
4 pushbuttons for value and parameter settings