CHI TIẾT

GESTRA Steam Systems
Issue Date: 11/08
Product Range B
Compact System for Level Monitoring
NRGT 26-1
NRGT 26-1S For Marine Applications
NRGT 26-1
NRGT 26-1S
Description
The compact system NRGT 26-1 works according to the capacitance measurement principle. The NRGT 26-1 is designed for signalling different levels in conductive and non-conductive liquids:
n Water level maintained within the control band defined by two preset limits.
The NRGT 26-1 has a level transmitter integrated in the terminal box which produces a standard output signal of 4-20 mA. External switchgear is not required.
Function
The principle of capacitance measurement is applied to determine the level. The electrode rod and the vessel wall form a capacitor. If the level of the dielectric located between the two capacitor plates changes, the current which flows through the plates changes proportionally to the level. A dielectric is defined as an insulating substance, which excludes many liquids such as water. In order to receive a useful measuring result the measuring rod, which is completely submerged in the liquid, must be completely insulated. After calibration of the zero point/measuring range (0 % - 100 %) of the control unit, the level can be read off from a remote display unit. The level measuring range can be changed during operation.
Design
NRGT 26-1:
Electrode with screwed connection ¾" BSP, EN ISO 228-1.
NRGT 26 -1S:
Flanged design for marine applications DN 50, PN 40, DIN 2635.
Technical Data
Type approval no.
NRGT 26-1: TÜV · WRS · 02-391
NRGT 26-1 S: LR 98/20075 RINA ELE/30298/2 GL 99249-96HH BV 10617/AO BV NKK A-556 DNV A-8394
KR HMB 06190-MS002
Power consumption
5 VA
Fuse
Thermal fuse T = 102 °C
Sensitivity
Range 1: Water ≥ 0.5 µ S/cm Range 2: Water ≥ 20 µ S/cm Range 3: Fuel oil EL e 2.3
Output
4-20 mA level-proportional. Volt-free, max. load 500 Ω
Indicators and adjustors
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 selecting the measuring range.
2 trimmer potentiometers for small-percentage adjust- ment of the measuring range.
2 terminal lugs for voltage metering.
Cable entry
Cable gland with integral cable clamp
M 20 (PG 16) (2 x)
Protection
IP 65 to DIN EN 40050
Max. admissible ambient temperature
70 °C
Weight
NRGT 26-1: Approx. 1.8 kg NRGT 26-1S: Approx. 8.0 kg
GESTRA NRGT 26-1
GESTRA Steam Systems

Service pressure
32 bar g at 238°C
Connection
NRGT 26-1: Screwed ¾", EN ISO 228-1 NRGT 26-1S: Flanged DN 50, PN 40, DIN 2635
Materials
Body 3.2161 G AlSi8Cu3
Cover tube 1.4301 X5CrNi18-10
Flange 1.0460 P250GH
Measuring electrodes 1.4571 CrNiMoTi17-12-2 Electrode insulation PTFE
Spacer disc PTFE
(design for marine applications)
Wiring diagram
NRGT 26-1 NRGT 26-1S
DC
Supply
Mains supply
230 V +/– 10 %, 50/60 Hz
115 V +/– 10 %, 50/60 Hz (optional) 24 V +/– 10 %, 50/60 Hz (optional)
1 2 3 4 5
Thermal
24 V d.c. (optional)
Overall length / measuring range
See table overleaf
4-20 mA
Max. load 500 Ω
PE
Earthing screw in housing
L N
Mains
+ –
24 V DC
fuse
Compact System for Level Monitoring
NRGT 26-1 NRGT 26-1S
For Marine Applications
Dimensions
173
GESTRA Steam Systems
173
GESTRA Steam Systems
Important Notes
Cable required for wiring: flexible multi-core control cable, min. conductor size 1.5 mm2.
GESTRA NRGT 26-1
GESTRA NRGT 26-1S
Order and Enquiry Specification
GESTRA Level electrode NRGT 26-1, PN 40
Mains supply...............................................................
Connection.............................................................
Inspection.............................................................
Length supplied...................................................... mm
Fluid.....................................................................
GESTRA Level electrode NRGT 26-1 S, PN 40 for marine applications
Mains supply...............................................................
Connection.............................................................
Inspection.............................................................
Length supplied...................................................... mm
Fluid.....................................................................
The following test certificates can be issued on request, at extra cost: In accordance with DIN EN 10204-2.1, -2.2 and -3.1B.
All inspection requirements have to be stated with the order. After supply of the equipment certification cannot be established. For tests and inspection charges please consult us.
Key
1 Flange PN 40, DN 50, DIN 2527 Flange PN 40, DN 100, DIN 2527
2 For the approval of the boiler standpipe with con- necting flange the relevant regulations must be
3 Vent hole
4 High water (HW)
5 Electrode rod d = 15 mm
6 Protection tube DN 80
! Reducer DIN 2616, part 2
K - 88.9 x 3.2 - 42.4 x 2.6 W
c NRGT 26-1: Measuring range
d NRGT 26-1S: Max. length of installation at 238 °C
e NRGT 26-1S: Measuring range
ATEX (Atmosphère Explosible)
ment must not be used in potentially explosive areas.
Æ 42
b c
Fig. 1 NRGT 26-1
¾" BSP
DN 50
4
b = 70
¾" BSP to EN ISO 228-1
b	c
373	300
477	400
583	500
688	600
794	700
899	800
1004	900
1110	1000
1214	1100
1319	1200
1423	1300
1528	1400
1636	1500
2156	2000
1
2
3
5
6
0
Æ 42

d e

Fig. 2 NRGT 26-1 S
DN 20
b = 70
Flange DN 50, PN 40
Æ 48.5
Æ 42.5
1
2
4
5
0
d	e
316	275
420	375
526	475
631	575
737	675
842	775
947	875
1053	975
1157	1075
1262	1175
1366	1275
1471	1375
1579	1475
2099	1975
Supply in accordance with our general terms
of business.
Æ 20
Fig. 3 Protection tube for installation of electrode inside the boiler
Fig. 4 External measuring pot
DN 20

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