Flowserve NRG 16-19 User Manual
GESTRA
GESTRA Steam Systems
NRG 16-19
NRG 16-27
NRG 16-28
VKE 16-1
VKE 26
Installation Instructions 818725-01
Measuring electrode NRG 16-19
Measuring electrode NRG 16-27
Measuring electrode NRG 16-28
Test set VKE 16-1
Test set VKE 26
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Contents
Page
Important Notes
Usage for the intended purpose ..............................................................................................................4
Safety note ............................................................................................................................................. 4
Danger ...................................................................................................................................................4
PED (Pressure Equipment Directive) ........................................................................................................4
ATEX (Atmosphère Explosible) .................................................................................................................4
Explanatory Notes
Scope of supply ......................................................................................................................................5
Description ............................................................................................................................................. 5
Function .................................................................................................................................................5
Technical Data
NRG 16-19, NRG 16-27, NRG 16-28 .......................................................................................................
Corrosion resistance ...............................................................................................................................6
Test chamber VKE 16 ..............................................................................................................................
Test chamber VKE 26 ..............................................................................................................................7
Name plate / marking ............................................................................................................................. 8
Dimensions of NRG 16-19, NRG 16-27, NRG 16-28 ................................................................................
Dimensions of test chamber VKE 16 ......................................................................................................10
Dimensions of test chamber VKE 26 .....................................................................................................11
Dimensions of NRG 16-28 for Rhombusline steam traps ......................................................................
Installation
NRG 16-19, NRG 16-27, NRG 16-28 .....................................................................................................12
Attention ............................................................................................................................................... 12
Tools .....................................................................................................................................................12
Examples of installation NRG 16-19, NRG 16-27, NRG 16-28 ................................................................13
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7
9
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Contents – continued –
Page
Wiring
Connecting cables for measuring electrodes ......................................................................................... 14
Wiring ...................................................................................................................................................14
Tools .....................................................................................................................................................14
Measuring electrodes NRG 16-27, NRG 16-28 pin assignment ..............................................................15
Commissioning
Checking wiring ....................................................................................................................................16
Applying mains voltage ......................................................................................................................... 16
Maintenance
Danger .................................................................................................................................................16
Maintenance interval ............................................................................................................................16
Decommissioning
Disposal................................................................................................................................................17
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Important Notes
Usage for the intended purpose
Use the electrodes NRG 16-19, NRG 16-27 and NRG 16-28 in conjunction with a suitable detector
(e. g. test station NRA 1-3) only for monitoring steam traps for banking-up of condensate and loss of
live steam.
Safety note
The equipment must only be installed and commissioned by qualified and competent staff.
Retrofitting and maintenance work must only be performed by qualified personnel who – through
adequate training – have achieved a recognised level of competence.
Danger
When loosening the measuring electrode steam or hot water might escape.
This presents the danger of severe scalding. It is therefore essential not to remove the
electrode unless the boiler pressure is verified to be zero.
The electrode is hot during operation. This presents the danger of severe burns to hands
and arms. Installation and maintenance work should only be carried out when the system
is cold.
PED (Pressure Equipment Directive)
The equipment fulfils the requirements of the Pressure Equipment Directive (PED) 97/23/EC.
Applicable with fluids of group 2.
ATEX (Atmosphère Explosible)
According to the European Directive 94/9/EC the equipment must not be used in explosion-risk areas.
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Explanatory Notes
Scope of supply
NRG 16-19
1 Measuring electrode NRG 16-19
1 Joint ring D 17 x 21 to DIN 7603 (made from 1.4301), form A, bright annealed
1 Installation manual
NRG 16-27
1 Measuring electrode NRG 16-27
1 Joint ring D 17 x 21 to DIN 7603 (made from 1.4301), form D, bright annealed
1 Installation manual
NRG 16-28
1 Measuring electrode NRG 16-28
1 Joint ring D 24 x 29 to DIN 7603 (made from 1.4301), form A, bright annealed
1 Installation manual
Description
The measuring electrode fitted in the steam trap or in a separate test chamber monitors the steam trap
for banking-up of condensate and loss of live steam.
The measuring electrodes NRG 16-27, NRG 16-28 feature an additional temperature sensor for
detecting the condensate temperature.
The test station NRA 1-3 is designed for the connection of up to max. 16 measuring electrodes.
Function
The following electrodes can be used for monitoring steam traps:
n Measuring electrodes NRG 16-27, NRG 16-28 for detecting loss of live steam (electrode exposed)
and banking-up of condensate (by measuring the temperature of the condensate) or
n Measuring electrode NRG 16-19 for detecting banking-up of condensate or loss of live steam
(electrode exposed or immerged).
The measuring electrode NRG 16-27, NRG 16-28 works according to the conductivity measurement
principle and signals electrode exposed or immerged. The equipment is also equipped with a temperature sensing element PT 1000 for measuring the temperature of the condensate. The measuring
electrode is installed either directly inside the steam trap to be monitored or in the separate test
chamber VKE 16 mounted upstream of the steam trap.
Faulty steam traps cause either banking-up of condensate or loss of live steam. Both conditions will be
detected by the measuring electrode and indicated and evaluated by the test station NRA 1-3.
The measuring electrode NRG 16-19 works according to the conductivity measurement principle, too.
Depending on the installation the electrode detects either loss of live steam or banking-up of condensate. The readings are then evaluated by the test station NRA 1-3 or by the level switch NRS 1-2.
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Technical Data
NRG 16-19, NRG 16-27, NRG 16-28
Service pressure
PN 40, max. 32 barg at 238°C
Connection
NRG 16-19, NRG 16-27: screwed
NRG 16-28: screwed M 24 x 1.5
Materials
NRG 16-19
Screw-in type enclosure
Spacer disk
Electrode rod
Insulating disk
NRG 16-27, NRG 16-28
Screw-in type enclosure
Electrode rod
Insulation of electrode rod
Sensitivity of response
> 1 μS/cm at 25°C
Electrode voltage
12 V
Wiring
NRG 16-19: Connecting line made from PTFE, 2 m long, 2 x 1.5 mm
NRG 16-27, NRG 16-28: M 12 sensor connector, 5 poles, A coded
Protection
IP 65 to DIN EN 60529
Ambient temperature at terminal box
Max. 80°C
Weight
Approx. 0.3 kg
3
/8" to ISO 228-1
2
Corrosion resistance
When used for its intended purpose the safe functioning of the electrode will not be impaired by
corrosion.
Gylon® is a registered trademark of Garlock GmbH, Neuss
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