Gestra nrgt 26 1 инструкция по эксплуатации

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This manual is related to the following products:

NRGT26-1S

GESTRA

Important Notes

Usage for the intended purpose

Use level electrodes NRGT 26-1 and NRGT 26-1S only for indicating liquid levels.

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.

Danger

When loosening the electrode steam or hot water might escape. This presents the danger of severe scalds to the whole body.

It is essential not to mount or dismantle the electrode unless the boiler pressure is verified to be 0 bar. The electrode becomes hot during operation. Touching the hot equipment presents the risk of severe burns to hands and arms. All installation and maintenance work must only be performed when the equipment is cold.

The terminal strip of the NRGT 26-1 / NRGT 26-1S is live during operation. This presents the danger of electric shock.

Cut off power supply before fixing or removing the housing cover.

Attention

The name plate specifies the technical features of the equipment. Note that any piece of equipment without its specific name plate must neither be commissioned nor operated.

ATEX (Atmosphère Explosible)

According to the European Directive 94/9/EC the equipment must not be used in potentially explosive areas.

Explanatory Notes

Scope of supply

NRGT 26-1

1 Compact system type NRGT 26-1

with joint ring (of stainless steel 1.4301) D 27 x 32 to DIN 7603, bright annealed 1 Installation manual

NRGT 26-1S (for marine applications)

1 Compact system type NRGT 26-1S with flange DN 50 (2″), PN 40 to DIN 2635 1 Installation manual

System description

The compact system NRGT 26-1 works according to the capacitance measurement principle. The NRGT 26-1 is used for signalling different levels in electrically conductive and non-conductive liquids:

■ Level maintained within the control band defined by two preset limits

The NRGT 26-1 has a level transmitter integrated in the electrode body which produces a standard 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 submerged to varying depths in the liquid, must be completely insulated. After the calibration of the zero point/measuring range (0 %/100 %) the level can be read off from a remote display unit. The level measuring range can be changed during operation.

Designs

NRGT 26 1:

Screwed design ¾» BSP, DIN ISO 228-1. Fig. 2

NRGT 26 1S:

Flanged design for marine application DN 50, PN 40, DIN 2635. Fig. 3

Technical Data

Technical Data – continued –

NRGT 26 1, NRGT 26 1S – continued –

Power consumption

5 VA, 3 VA at 24 V DC

Fuse

Thermal fuse Tmax = 102 °C

Sensitivity

Range 1: Water ≥ 0,5 µS/cm

Range 2: Water ≥ 20 µS/cm Range 3: Fuel oil EL εr 2,3

Output

4 – 20 mA level-proportional; electrically insulated, max. load 500 Ω

Indicators and adjustors

2 red LEDs for “level 0 %” or “level 100 %” within the measuring range, 1 green LED for “level between 0 % and 100 %” of measuring range,

1 code switch for selecting the measuring range,

2 trimmer potentiometers for small-percentage adjustment of the measuring range, 2 terminal lugs for voltage measurement.

Cable entry

Cable gland with integral cable clamp 2 x M20 x 1.5

Protection

IP 65 nach DIN EN 60529

Max. admissible ambient temperature

70 °C (158 °F)

Weight

NRGT 26 1: approx. 1.8 kg NRGT 26 1S: approx. 8.0 kg

Corrosion resistance

Provided that the equipment is used for its intended purpose, its safety is not impaired by corrosion.

Sizing

The body must not be subjected to sharp increases in pressure. Welds and flanges of the electrode are designed to withstand dynamic loading (bending and alternating stress). The dimensional allowances for corrosion reflect the latest state of technology.

• 17, 17 Basic Setting Factory setting NRGT 261 The compact system is delivered with the following factory set default values: ■ Measuring range 1300 mm: Switch K position 4, water ≥ 20 µS/cm ■ Measuring range 1400 mm up to 1700 mm: Switch K position 4, water ≥ 20 µS/cm ■ Measuring range 1800 mm up to 1500 mm: Switch K position 4, water ≥ 20 µS/cm ■ Me…

• 9, 9 42 Flansch PN 40, DN 50 62 ~ 338 140 173 GESTRA Steam System s GESTRA NRGT 26-1S G 3/4 ISO 228-1 173 140 26 37 1 Tiefe: 70 mm 42 GESTRA St eam System s GESTRA NRGT 26-1 ~ 338 337,5 339 173 140 173 62 140 3 4 b = 70 b = 70 ∅ 42 ¾» BSP 37 1 2 26 Flange DN 50, PN 40 ∅ 42 Technical Data – continued – Dimensions Fig. 3Fig. 2 2, 4 constant length (no elo…

• 24, 24 Agencies all over the world: www.gestra.de 810213-04/1205cm · © 1997 GESTRA AG · Bremen · Printed in Germany GESTRA Great Britain Flowserve Flow Control (UK) Ltd. Burrel Road, Haywards Heath West Sussex RH 16 1TL Tel. 00 44 14 44 / 31 44 00 Fax 00 44 14 44 / 31 45 57 E-mail: [email protected]flowserve.com Italia Flowserve S.p.A. Flow Control Divis…

• 18, 18 1. Fill boiler or vessel with liquid until the lower measuring point is reached. 2. Wait until boiler or vessel has reached its service pressure. 3. Turn potentiometer L to the left until the red LED M lights up. 4. Turn potentiometer L to the right until only the green LED N lights up. You have now established the lower measuring point. Adjust lower measuring range Commissioning Dang…

• 19, 19 Operation Operation in steam and (pressurised) hot water plants in accordance with TRD 401, TRD 602, TRD 604, EN 12952, EN 12953 or other national regulations or according to the guidelines of classification societies. NRGT 261, NRGT 261S Note ■ Should malfunctions occur during the commissioning procedure refer to chapter “Operational Malfunctions” on…

• 5, 5 Explanatory Notes System description The compact system NRGT 26-1 works according to the capacitance measurement principle. The NRGT 26-1 is used for signalling different levels in electrically conductive and non-conductive liquids: ■ Level maintained within the control band defined by two preset limits The NRGT 26-1 has a level transmitter integrated in the electrode body which p…

• 1,  GESTRA Steam Systems GESTRA NRGT 261 NRGT 261S Installation Instructions 81021304 Level electrode NRGT 26-1, NRGT 26-1 S
  …

• 10, 10 GESTRA S team Sys tems GESTRA NRGT 26-1S GESTRA Steam Sy stems GESTRA NRGT 26-1 Design Fig. 4 Fig. 6 N 1 N 10 0.5 ∅ 33 ¾» BSP DIN 228 NRGT 261, NRGT 261S A.F. A C B G F E D A Fig. 5
  …

• 12, 12 A Thermal insulation provided on site, d = 20 mm (without thermal insulation of steam boiler) B Seating surface C Joint ring (of stainless steel 1.4301) D 27 x 32 to DIN 7603 D Electrode thread ¾» BSP, DIN ISO 228-1 E Flange DN 50 (2″), PN 40 to DIN 2635 F Protection tube G Spacer disc H Housing screws M4 I Cable entry M20 x 1.5 J Housing cover …

• 2, 2 Contents Usage for the intended purpose ………………………………………………………………………………………………..4 Safety note ……………………………………………………………………………………………………………………………4 Danger …………………………………………..…

• 13, 13 Attention ■ The seating surfaces of the threads or flange provided on the vessel or boiler standpipe must be accurately machined. Fig. 6 ■ Do not bend electrode rod when mounting. ■ Do not lag electrode body. ■ Do not insulate electrode thread with hemp or PTFE tape. Installation NRGT 261 1. Check seating surfaces of threads or �…

• 8, 8 Technical Data – continued – Name plate / marking Fig. 1 PN 40PN 40 PN 40PN 40 IP 65IP 65 PmaxPmax TmaxTmax NRGT 26-1 NRGT 26-1S TÜV . WRS. 02-391 G ¾ 1.4571 DN 50 1.4571/1.0460DN 50 1.4571/1.0460 250 V ~ T 2,5 A250 V ~ T 2,5 A Before removing cover isolate from power supplies See installation instructions Before removing cover isolate from power supplies See inst…

• 21, 21 Disposal Decommissioning Remove the level electrode and separate the waste materials in accordance with the material specification. Electronic components (boards) must be disposed of separately. For the disposal of the level electrode observe the pertinent legal regulations concerning waste disposal. Danger Risk of severe burns and scalds to the whole body! B…

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