GESTRA NRGS 15-1 User manual
1
EN
English
Level switch
NRGS 15-1
Original Installation Instructions
818479-04
2
Contents
Page
Important notes
Usage for the intended purpose...............................................................................................................4
Function..................................................................................................................................................4
Safety note..............................................................................................................................................5
Directives and Standards
LV (Low Voltage) Directive and EMC (Electromagnetic Compatibility)........................................................6
ATEX (Hazardous Area) ............................................................................................................................6
UL/cUL (CSA) Approval ............................................................................................................................6
Note on the Declaration of Conformity / Manufacturer's Declaration ..................................................6
Technical Data
Level switch NRGS 15-1 .........................................................................................................................7
Scope of supply ......................................................................................................................................8
Name plate / marking .............................................................................................................................9
Dimensions...........................................................................................................................................10
Establishing Functions
Selecting function .................................................................................................................................11
Level switch NRGS 15-1 .......................................................................................................................12
Establishing functions ...........................................................................................................................13
Changing the time delay........................................................................................................................13
Key .......................................................................................................................................................13
Adjusting sensitivity range.....................................................................................................................14
Installation
Tools .....................................................................................................................................................15
NRGS 15-1............................................................................................................................................16
NRGS 15-1, step 1 ................................................................................................................................17
NRGS 15-1, step 2 ................................................................................................................................17
Table "Functions"..................................................................................................................................17
Key .......................................................................................................................................................17
Examples of installation ........................................................................................................................18
Key .......................................................................................................................................................18
3
Contents
Page
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Electrical connection
Level switch NRGS 15-1 .......................................................................................................................19
Connecting level switch NRGS 15-1 .....................................................................................................19
Wiring diagram .....................................................................................................................................20
Tools .....................................................................................................................................................20
Commissioning procedure
Checking electrical connection..............................................................................................................21
Applying supply voltage.........................................................................................................................21
Checking switchpoints and functions ....................................................................................................21
Checking switchpoints and functions ....................................................................................................22
Checking switchpoints and functions ....................................................................................................23
Troubleshooting
Indication, diagnosis and remedy ..........................................................................................................24
Indication, diagnosis and remedy ..........................................................................................................25
Replacing electronic module .................................................................................................................25
Removing and disposing of the level switch
Removing and disposing of the level switch ..........................................................................................26
Annex
Adjust other functions ...........................................................................................................................27
Installation in non-metallic vessel..........................................................................................................27
4
Important notes
Usage for the intended purpose
The level switch NRGS 15-1 is designed for detecting and signalling four different liquid levels and
works for instance in condensate and feedwater tanks, steam boilers and (pressurised) hot-water in-
stallations as water level and switching controller with MIN and MAX alarm.
Function
The level switch NRGS 15-1 is a complete package consisting of a four-tipped level electrode and an
integrated level switching controller. The equipment works only with water having a min. electrical con-
ductivity of > 0.5 μS/cm at 25°C.
A switching channel with time delay, an output relay and a signal LED are assigned to each electrode
tip.
The functions of the switching channels 1 and 4 are fixed, the switchting channels 2 and 3 can be ad-
justed via code switch to suit individual requirements. The tips of the electrode are cut to length on site
in order to establish the desired switchpoints of the associated switching channels.
The following functions are possible:
nElectrode rod 1 exposed / switching channel 1 energizes relay 1 = low level 1 with optional perfor-
mance test and lock-out function
nElectrode rod 2 exposed / switching channel 2 energizes relay 2 = low level 2
nElectrode rod 3 exposed or submerged / switching channel 3 energizes relay 3 in a time-controlled
way =timed pump control (fill/discharge control)
nElectrode rods 2 and 3 exposed or submerged / switching channel 3 energizes relay 3 = on/off pump
control (fill/discharge control)
nElectrode rod 4 submerged / switching channel 4 energizes relay 4 = high level
5
Danger
When loosening the level electrode steam or hot water might escape. This presents the
danger of severe scalds to the whole body.
Do NOT remove the level switch unless the boiler pressure is verified to be 0 bar.
The level switch becomes hot during operation.
Risk of severe burns to hands and arms.
Before carrying out installation and maintenance work make sure that the equipment is
cold.
The terminal strip of the level switch is live during operation.
This presents the danger of electric shock!
Always cut off power supply to the equipment before mounting, removing or connecting
the equipment and the terminal strips!
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 staff who - through adequate
training - have achieved a recognised level of competence.
Important notes
The name plate specifies the technical features of the equipment. Do not commission or
operate any item of equipment that does not bear its specific name plate.
Attention
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6
ATEX (Hazardous Area)
LV (Low Voltage) Directive and EMC (Electromagnetic Compatibility)
The equipment meets the requirements of the Low Voltage Directive 2014/68/EU and the EMC
Directive 2014/30/EU.
According to the European Directive 2014/34/EC the equipment must not be used in
explosion-risk areas.
Note on the Declaration of Conformity / Manufacturer's Declaration
For details on the conformity of our equipment with European Directives, please refer to our
Declaration of Conformity or our Manufacturer's Declaration.
The current Declaration of Conformity / Declaration of Manufacturer are available in the Internet under
www.gestra.de/documents or can be requested from us.
Directives and Standards
The equipment complies with the requirements of the following standards: UL 508 and CSA C22.2 No.
14-13, Standards for Industrial Control Equipment. File E243189.
UL/cUL (CSA) Approval
7
Level switch NRGS 15-1
Technical Data
Service pressure
PN 25, 25 bar at 224°C
Mechanical connection
Screwed G 1A, ISO 228
Materials
Screw-in body: 1.4571, CrNiMoTi17-12-2 or 1.4404, A 470 316L for NPT thread
Electrode rods: 1.4571, CrNiMoTi17-12-2
Insulation of electrode rod:
PTFE
Spacer disc: PTFE
Terminal box: Polycarbonate
Electrode rods
Length supplied: 1000 mm
Diameter: 5 mm
Supply voltage
220 – 240 V +10/–15 %, 50/60 Hz
110 – 120 V +10/–15 %, 50/60 Hz (optional)
24 V +10/–15 %, 50/60 Hz (optional)
Power consumption
3 VA
Fuse
external 63 mA, slow blow, at 230 V,
external 125 mA, slow blow, at 115 V,
external 1 A, slow blow, at 24 V.
Response sensitivity (Electrical conductivity of water at 25°C)
> 0.5 ... < 1000 μS/cm or > 10 ... < 10000 μS/cm (switch-selectable)
Electrode voltage
20 Vss
Output
4 volt-free change-over contacts,
8 A 250 V AC / 30 V DC cos ϕ= 1 (IEC 61810)
Ensure interference suppression by providing contactor with an arc suppressor RC combination
Energizing /de-energizing delay
Relay 1 and 2: 1s, factory set
Relay 3: 0-30s, adjustable via potentiometer
Relay 4: 3s, factory set
Indicators and adjustors
3 red LEDs to indicate "Low level alarm 1 + 2 / High level".
1 yellow LED to indicate "Pump ON".
1 green LED to indicate "Power ON".
1 ten-pole code switch to select the sensitivity range and to establish the functions.
1 potentiometer for setting the time delay (0 to 30 s
1 test button in the terminal box to check the function of switching channel 1 (connected to terminals).
1 reset button in the terminal box to reset the lock-out function (connected to terminals).
8
Technical Data
Level switch NRGS 15-1
Cable entry / electrical connection
3 cable glands with integral cable clamps (M 16)
1 two-pole terminal strip for power supply.
1 twelve-pole terminal strip for connecting the control cables.
1 four-pole terminal strip for test and reset button.
Screw-type terminal strips, conductor size ≤ 1,5 mm2.
Protection
IP 65 to DIN EN 60529
Protection class
2 (completely insulated)
Ambient temperature
when system is switched on: 0° ... 70°C, during operation: –10 °C ... 70°C
Transport temperature
–20° ... +80°C (< 100 hours), defrosting time of the de-energized equipment before it can be put into
operation: 24 hours.
Storage temperature
–20° ... +70°C, defrosting time of the de-energized equipment before it can be put into operation:
24 hours.
Relative humidity
max. 95%, no moisture condensation
Weight
approx. 1.4 kg
Approvals
UL/cUL (CSA) approval UL 508 and CSA C22.2 No. 14-13, Standards for Industrial Control
Equipment. File E243189.
Scope of supply
NRGS 15-1
1 Level electrode with four tips
1 Terminal box with integrated level switch
1 Joint ring 33 x 39, form D, DIN 7603, made from 1.4301, bright annealed
1 Installation manual
or
NRGS 15-1
1 Level electrode with four tips
1 Terminal box with integrated level switch and built-in Test and Reset pushbutton
1 Joint ring 33 x 39, form D, DIN 7603, made from 1.4301, bright annealed
1 Installation manual
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9
Protection
Manufacturer
Disposal note
De-energizing delay /
Response sensitivity
Service pressure/temperature
Safety note
Equipment designation
Name plate / marking
Fig. 1
Technical Data
Before removing cover, isolate from
power supplies. See installation
instructions!
Avant d'ouvrir le couvercle
dèconnecter complètement l'appareil.
Voir instructions de montage.
Vor Öffnen des Deckels, Gerät
freischalten! Betriebsanleitung
beachten!
250 V ~T2,5 A
100-120 VAC 50/60 Hz 3VA
Pmax
Tmax
NRGS 15-1
0-30 s 0,5 / 10 µS/cm
Niveauschalter
Level switch
Commutateur de niveau
GESTRA AG
Münchener Str.77
D-28215 Bremen
Phone:+49 (0) 421 / 3503-0
gestra.ag@flowserve.com
Tamb = 70°C (158 °F)
IP65
PN 25 G1 1.4571
25 bar (363psi)
224°C (435°F)
Mat.-Nr.: XXXXXX
Niveauschalter
Level switch
Commutateur de niveau
Before removing cover, isolate from
power supplies. See installation
instructions!
Avant d'ouvrir le couvercle
dèconnecter complètement l'appareil.
Voir instructions de montage.
Vor Öffnen des Deckels, Gerät
freischalten! Betriebsanleitung
beachten!
250 V ~T2,5 A
220-240 VAC 50/60 Hz 3VA
Pmax
Tmax
NRGS 15-1
0-30 s 0,5 / 10 µS/cm
GESTRA AG
Münchener Str.77
D-28215 Bremen
Phone:+49 (0) 421 / 3503-0
gestra.ag@flowserve.com
Tamb = 70°C (158 °F)
IP65
PN 25 G1 1.4571
25 bar (363psi)
224°C (435°F)
Mat.-Nr.: XXXXXX
Pressure rating, thread type,
material number
Electrical specification
Fuse for output contact
Max. admissible
ambient temperature
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10
4 3
A
Technical Data
Dimensions
180
357
1000
Fig. 2
b = 60
G 1A, ISO 228
130
∅42
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