GESTRA NRGT 26-1S Manuale utente
1
EN
English
Level Transmitter
NRGT 26-1
NRGT 26-1S
Original Installation Instructions
810213-11
2
Contents
Page
Important notes
Usage for the intended purpose...............................................................................................................4
Function..................................................................................................................................................4
Safety note..............................................................................................................................................4
Directives and standards
VdTÜV Bulletin "Water Monitoring 100"...................................................................................................5
Approvals for Marine Applications ...........................................................................................................5
LV (Low Voltage) Directive and EMC (Electromagnetic Compatibility)........................................................5
ATEX (Atmosphère Explosible) .................................................................................................................5
UL/cUL (CSA) Approval ............................................................................................................................5
Note on the Declaration of Conformity / Declaration by the Manufacturer ..........................................5
Technical data
NRGT 26-1, NRGT 26-1S.........................................................................................................................6
Scope of supply ....................................................................................................................................7
Name plate/marking ...............................................................................................................................8
Installation
Dimensions NRGT 26-1, NRGT 26-1S....................................................................................................10
NRGT 26-1............................................................................................................................................11
NRGT 26-1S..........................................................................................................................................11
Key .......................................................................................................................................................11
Tools.....................................................................................................................................................11
Examples of installation
NRGT 26-1............................................................................................................................................12
Key .......................................................................................................................................................13
Electrical connection
NRGT 26-1, NRGT 26-1S.......................................................................................................................14
Connection of level transmitter..............................................................................................................15
Connecting the NRGT 26-1, NRGT 26-1S...............................................................................................15
Key .......................................................................................................................................................15
Tools.....................................................................................................................................................15
Wiring diagram for level transmitter NRGT 26-1, NRGT 26-1S ...............................................................16
Connecting level transmitter NRGT 26-.. with supply voltage 24 V AC/DC ..............................................16
Connecting level transmitter NRGT 26-.. with supply voltage 115 / 230 V AC.........................................16
Actual value output ...............................................................................................................................16
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Contents
Page
- continued -
Basic settings
Factory setting NRGT 26-1....................................................................................................................17
Factory setting NRGT 26-1S..................................................................................................................17
Establishing active measuring range (control range)..............................................................................17
Commissioning procedure
Applying supply voltage.........................................................................................................................18
Adjusting lower end of measuring range ..............................................................................................18
Adjusting upper end of measuring range...............................................................................................18
Troubleshooting
Indication, diagnosis and remedy ..........................................................................................................19
Replacing electronic module ................................................................................................................20
Maintenance
Safety note............................................................................................................................................21
Cleaning the electrode rod ....................................................................................................................21
Removing and disposing of the level transmitter
Removing and disposing of level transmitter NRGT 26-1, NRGT 26-1S ..................................................21
4
Important notes
Usage for the intended purpose
The level transmitters NRGT 26-1 and NRGT 26-1S are used for continuous level monitoring in steam
boilers and (pressurized) hot-water installations or in condensate and feedwater tanks.
In conjunction with the level switch NRS 2-.. and the level controller NRR 2-.. the transmitter can be
used as water level controller with MIN/MAX alarm.
The level transmitter is designed for use in conjunction with the following level switches/controllers:
NRS 2-50, NRS 2-51, NRR 2-50, NRR 2-51, NRR 2-52 and NRR 2-53.
The level transmitter can be used in electrically conductive and non-conductive fluids.
Function
The level transmitter NRGT 26-1 is a compact-type system consisting of a level measuring electrode
and an electronic module integrated in the terminal box.
The level transmitter NRGT 26-1 works according to the capacitance measurement principle and
translates the level changes into a level-dependent current signal of 4-20 mA, with the length of the
electrode rod determining the measuring range.
The level transmitter is installed inside steam boilers, vessels or in an external level pot. If the elec-
trode is installed inside the boiler or vessel, a protection tube provided on side ensures correct func-
tioning (see section Examples of installation (page 12).
The level transmitter can be installed together with one GESTRA level electrode for water level limiting
or for high-level alarm in a single protection tube or an external level pot.
Safety note
Danger
When loosening the level transmitter steam or hot water might escape!
This presents the risk of severe scalding all over the body!
It is therefore essential not to dismantle the level transmitter unless the boiler pressure is
verified to be 0 bar.
The level transmitter 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 transmitter is live during operation.
This presents the danger of electric shock!
Cut off power supply before mounting or removing the housing cover!
Attention
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.
The equipment must only be installed, wired 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.
5
The equipment meets the requirements of Directives: UL 508 and CSA C22.2 No. 14-13, Standards for
Industrial Control Equipment. File E243189.
Directives and standards
VdTÜV Bulletin "Water Monitoring 100"
Approvals for Marine Applications
The level transmitter NRGT 26-1S is approved for marine applications.
The level transmitter NRGT 26-1 is type approved acc. to VdTÜV Bulletin "Water Level 100" if used in
combination with the following level switches / controllers: NRS 2-50, NRS 2-51, NRR 2-50, NRR 2-51,
NRR 2-52 and NRR 2-53.
The VdTÜV Bulletin "Wasserstand (=Water Level) 100" specifies the requirements made on water level
control and limiting equipment for boilers.
ATEX (Atmosphère Explosible)
According to the European Directive 2014/34/EU the equipment must not be used in explosion risk areas.
UL/cUL (CSA) Approval
LV (Low Voltage) Directive and EMC (Electromagnetic Compatibility)
The level transmitter NRGT 26-1 meets the requirements of the Low Voltage Directive 2014/35/EU and
the EMC Directive 2014/30/EU.
For details on the conformity of our equipment according to the European Directives see our Declaration
of Conformity or our Declaration of Manufacturer.
The current Declaration of Conformity and Declaration of Manufacturer are available in the Internet under
www.gestra.com documents
or can be requested from us.
Note on the Declaration of Conformity / Declaration by the Manufacturer
6
NRGT 26-1, NRGT 26-1S
Technical data
Service pressure
PN 40, 32 bar at 238°C
Mechanical connection
NRGT 26-1: Screwed G ¾ A, ISO 228
NRGT 26-1S: Flange DN 50, PN 40, DIN EN 1092-01
Materials
Screw-in body: 1.4571, X6CrNiMoTi17-12-2
Electrode rod insulation: PTFE
Terminal box: 3.2161 G AlSi8Cu3
NRGT 26-1S: Flange 1.0460 P250GH
NRGT 26-1S: Spacer disc: PTFE
NRGT 26-1
Length of installation
at 238°C
373 477 583 688 794 899 1004 1110
Measuring range 300 400 500 600 700 800 900 1000
Length of installation
at 238°C
1214 1319 1423 1528 1636 2156
Measuring range 1100 1200 1300 1400 1500 2000
NRGT 26-1S
Length of installation
at 238°C
316 420 526 631 737 842 947 1053
Measuring range 275 420 526 575 675 737 875 975
Length of installation
at 238°C
1157 1262 1366 1471 1579 2099
Measuring range 1075 1175 1275 1375 1475 1975
Weight
NRGT 26-1: approx. 1.8 kg
NRGT 26-1S: approx. 8.0 kg
Electronic module
Supply voltage
24 V AC/DC
AC +/– 20%
DC +10 / –45%
115 V +/– 10%, 50/60 Hz (option)
230 V +/– 10 %, 50/60 Hz (option)
Power consumption
3 VA at 24 V DC
5 VA at 24, 115, 230 V AC
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Technical data
NRGT 26-1, NRGT 26-1S
Fuse
external slow-blow 0.5 A
internal thermal fuse Tmax = 102°C
Sensitivity of response
Range 1: Water ≥ 20 µS/cm
Range 2: Water ≥ 0.5 µS/cm
Range 3: Fuel oil EL εr2,3
Output
Actual value 4 – 20 mA, level proportional. Electrically insulated, max. load 500 Ω
Indicators and adjusters
2 red LEDs for signalling "Level 0 %" or "Level 100" within the measuring range
1 green LED for signalling “Level between 0 % and 100 %” of measuring range
1 code switch for setting the measuring range
2 adjustable resistors for small-percentage adjustment of the measuring range
2 terminal lugs for voltage measurement
Electrical connection
2 cable glands with integral cable clamp M20 x 1.5
Screw-type terminal strip with 2 and 3 terminals, detachable, conductor size 1.5 mm2
Protection
IP 65 to DIN EN 60529
Max. admissible ambient temperature
Max. 70 °C
Storage and transport temperature
– 40 to + 80 °C
Approvals:
TÜV certificate VdTÜV Bulletin "Water Level 100"
Requirements made on water level limiting & control equipment.
Type approval no. TÜV · WR · XX-391, XX-425, XX-426, XX-427
(see name plate)
UL/cUL (CSA) Approval The equipment meets the requirements of Directives: UL 508 and CSA C22.2
No. 14-13, Standards for Industrial Control Equipment. File E243189.
Marine applications DNV A-13857, KR HMB 06190-MS002, NK TA11016M, BV 10617/CO
CCS HBT 0742 1062-1, RINA ELE 407609CS, GL 992499-96 HH;
LR 98/20074 (E2)
Scope of supply
NRGT 26-1
1 Level transmitter NRGT 26-1
1 Joint ring 27 x 32, form D, DIN 7603, 2.4068, bright annealed
1 Installation manual
NRGT 26-1S (for marine applications)
1 Level transmitter NRGT 26-1S with flange DN 50, PN 40, DIN EN 1092-01
1 Installation manual
- continued -
- continued -
8
Technical data
Name plate/marking
Equipment designation,
pressure rating
Fig. 1
End connection,
material number
Pressure/temperature rating
Power rating
Measuring range
Actual value output
CE Marking
Manufacturer
Safety note
Disposal note
PN 40PN 40
PN 40PN 40
IP 65IP 65
32 bar (464psi)
238°C (460°F)
32 bar (464psi)
238°C (460°F)
Tamb
70°C
(158°F)
Tamb
70°C
(158°F)
Münchener Str.77
D-28215 Bremen
Münchener Str.77
D-28215 Bremen
Type approval no.
- continued -
TÜV · WR · XX-391, -425, -426, -427
9
Installation
Note
The level transmitter NRGT 26-1 can be installed together with one GESTRA level elec-
trode for water level limiting or for high-level alarm in a single protection tube or exter-
nal level pot (inside diameter 100 m). Fig. 5 - 8. If the level limiting electrode is installed
inside the vessel, it must be at least 40 mm away from the upper vent hole.
For the approval of the boiler standpipe the relevant regulations must be considered.
Refer to pages 12 and 13 for typical installation examples.
The angle of inclination of the electrode must not exceed 45°, with the length of the
electrode being limited to 688 mm. Fig. 9
The seating surfaces of the standpipe or the flange provided on the vessel must be
accurately machined, see Fig. 4.
Do not bend electrode tip when mounting.
Do not subject electrode to physical shocks.
Use only the supplied joint ring. NRGT 26-1: 27 x 32, form D, DIN 7603, 2.4068,
bright annealed
Do not lag transmitter body above the hexagonal section.
Do not insulate transmitter thread with hemp or PTFE tape!
Do not apply conductive paste or grease to the transmitter thread!
Observe the minimum withdrawal distance when installing the transmitter!
Observe the specified tightening torque.
Do not cut the electrode rod.
Attention
10
GESTRA Steam Systems
GESTRA
Installation
Dimensions NRGT 26-1,NRGT 26-1S
0
9
8
Fig. 3
NRGT 26-1S
a
b = 68
173173
Ra 3.2
0.5
∅ 33
Ra 12.5
Fig. 4
140
∅48.5
∅ 42.5
336
62
7
- continued -
3
4
Screwed G ¾ A,
ISO 228
GESTRA Steam Systems
GESTRA
Fig. 2
NRGT 26-1
173
b = 68
336
a
NRGT 26-1 NRGT 26-1S
1 2 3 4
373 300 316 275
477 400 420 375
583 500 526 475
688 600 631 575
794 700 737 675
899 800 842 775
1004 900 947 875
1110 1000 1053 975
1214 1100 1157 1075
1319 1200 1262 1175
1423 1300 1366 1275
1528 1400 1471 1375
1636 1500 1579 1475
2156 2000 2099 1975
5
7
6
140
37
26
Screwed G ¾ A,
ISO 228
12∅ 15
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