Flowserve NRA 1-3 - Manual (Page 5)

5
Scope of supply
NRA 1-3
 Test station NRA -3
 Installation manual
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 6-7, NRG 6-8 feature an additional temperature sensor for
measuring the temperature of the condensate.
Up to 6 measuring electrodes and a temperature sensor for measuring the temperature of the installa-
tion can be connected to the test station NRA -3.
Function
The following electrodes can be used for monitoring steam traps:
n
Measuring electrode NRG 6-9 for detecting banking-up of condensate or steam loss (electrode
submerged or exposed)
n
Measuring electrode NRG 6-7, NRG 6-8 for detecting steam loss and banking-up of conden-
sate, with the condensate temperature being measured by an integrated temperature sensor
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 6-7, NRG 6-8 you can set the switchpoint for the
message “Banking-up of condensate” as a function of the separately detected temperature of the
installation 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.
System components
TRG 5-63 (e. g.)
Temperature sensor with resistance thermometer Pt 00 for measuring the temperature of the
installation.
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 ex-
posed) with integrated temperature sensor PT 000 for measuring the temperature of the condensate.