Flowserve NRG 16-42 - Manual (Page 5)

5
Explanatory Notes
Scope of supply
NRG 16-42
Level electrode type NRG 6-42
Joint ring (of stainless steel .430) D 33 x 39 to DIN 7603, bright annealed
Terminating resistor 20 Ω
Installation manual
Description
The level electrode NRG 6-42 works according to the conductivity measurement principle.
With the NRG 6-42 a maximum of 4 levels can be signalled in conductive liquids:
■
4 levels with one switchpoint each.
■ High level (MAX) alarm, Low level (MIN) alarm, pump ON, pump OFF with one switchpoint each.
Use level electrode NRG 6-42 in combination with level switch type NRS -42 or further system
components. The level data are transferred to the level switch or another system component via
CAN data bus, using the CANopen protocol.
System components
NRS 1-42
Data exchange: CAN bus to DIN ISO 898, using CANopen protocol.
URB 1, URB 2
Control terminal & display unit.
Functions: Parameterization and visual display (LCD).
Data exchange: CAN bus to DIN ISO 898, using CANopen protocol.
Design
NRG 16-42:
Screwed design " BSP, EN ISO 228-. Fig. 2
Function
The conductivity of the liquid is used to signal the liquid level. Some liquids are conductive, which
means that they allow an electric current to flow through them.
For the safe functioning of this device a minimum conductivity of the liquid to be measured is required.
The conductivity measurement method can detect two conditions: electrode rod submerged or
exposed, meaning switchpoint reached (or exceeded) or not yet reached. Before installation, the
length of the electrode rod must be cut to the required switching levels, e. g. for max./min. alarm,
controlling of a valve or pump.
At regular intervals the level electrode NRG 6-42 sends a data telegram to the level switch NRS -42.
The data are transferred via a CAN bus to DIN ISO 898 using the CANopen protocol.