5
Explanatory Notes
Description
The measuring electrode detects banking-up of condensate and steam loss either directly in the steam
trap or in separate test chambers.
The measuring electrodes NRG 16-27, NRG 16-28 feature an additional temperature sensor for
measuring the condensate temperature.
The test station NRA 1-3 is designed for the connection of up to max. 16 measuring electrodes and a
temperature sensor for measuring the plant temperature.
The test station NRA 1-3 is also available with a CAN bus interface.
Function
The following electrodes can be used for monitoring steam traps:
Measuring electrode NRG 16-19 (conductive) for detecting banking-up of condensate or steam loss
(electrode submerged or exposed) or
Measuring electrode NRG 16-27, NRG 16-28 for detecting steam loss (conductive) and
banking-up of condensate by measuring the condensate temperature by means of an integrated
temperature sensor Pt 1000.
Three LEDs indicate banking-up of condensate, steam loss and malfunction in measuring electrode
(cable disruption, short circuit) and a three-digit seven-segment display shows the number of the faulty
steam trap. If more than one steam trap are defective the numbers of the faulty traps are indicated one
after another.
If banking-up of condensate, steam loss or malfunction in measuring electrode is indicated, an output
relay for the collective alarm will also be energised.
When using the measuring electrodes NRG 16-27, NRG 16-28 you can set the switchpoint for the
message “Banking-up of condensate” as a function of the plant temperature that is detected separately
or of the temperature measured in the steam trap.
The seven-segment display indicates every 6 months the maintenance interval of the measuring
electrodes in the form of an error code.
The seven-segment display indicates also status and error messages.
For processing the measured values by a visual display unit - e. g. Spectorcontrol - the test station
NRA 1-3 is available with a CAN bus interface. The CANopen protocol is used for data exchange. The
electronic address (node ID) identifies the test station.
System components
TRG 5-53 (e.g.)
Temperature sensor with resistance thermometer Pt 100 for measuring the plant temperature.
NRG 16-19
Measuring electrode for detecting banking-up of condensate or steam loss (electrode submerged or
exposed).
NRG 16-27, NRG 16-28
Measuring electrode for detecting banking-up of condensate or steam loss (electrode submerged or
exposed) with integrated temperature sensor Pt 1000 for measuring the condensate temperature.
