Flowserve NRS1-40.1 - Manual (Page 5)

5
Explanatory Notes
Scope of supply
NRS 1-40.1
1 Control unit NRS 1-40.1
1 Terminating resistor 120
Ω
1 Installation manual
System description
The control unit NRS 1-40.1 has four limiting functions for monitoring the MIN/MAX water levels (low/high
level alarms) and MAX temperature in steam and (pressurised) hot water plants in accordance with TRD
and EN 12952 and EN 12953.
The level electrodes type NRG 1x-40, NRG 1x-41.1 and the temperature transmitter type TRV 5-40 detect
the current water level and temperature and their readings are sent as a data telegram to the CAN bus.
The CANopen protocol is used for the data transfer via CAN bus.
Only one limiting system with one control unit NRS 1-40.1 may be used per CAN bus network.