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NRG 26-21

Technical data

Level electrode

Service pressure

PN 40, 32 bar at 238 °C

Mechanical connection

Screwed G

A, DIN ISO 228

Materials

Screw-in body: 1.4571, X6CrNiMoTi17-12-2

Electrode rod insulation: PTFE

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

Weight

Approx. 1.8 kg (NRG 26-21 L=1000 mm)

Electronic module NRV 2-29

Supply voltage

12 V DC

Response sensitivity

Range 1:

Water

≥

0.5

S/cm

Range 2:

Water

≥

S/cm

Range 3:

Fuel oil EL

2,3

Output

≥ 0 – ≤ 7 V DC, level proportional

Adjustors

1 Code switch with 6 poles for setting the measuring range

Housing

PPO (Noryl

)

Electrical connection

1 Screw-type terminal strip with 3 poles, cable gland with integrated cable clamp M 16

Protection

IP 65 to EN 60529

Admissible ambient temperature

Max. 70 °C

Содержание NRG 26-21

Страница 1: ...1 Installation Operating Instructions 818774 05 Level Electrode NRG 26 21 GESTRA Steam Systems NRG 26 21 EN English ...

Страница 2: ...asserstand 100 Water Level 100 5 ATEX Atmosphère Explosible 5 UL cUL CSA Approval 5 Note on the Declaration of Conformity Declaration by the Manufacturer 5 Technical data NRG 26 21 6 Scope of supply 7 Name plate marking 7 Installation Dimensions NRG 26 21 8 Key 8 NRG 26 21 9 Tools 9 Examples of installation NRG 26 21 10 NRG 26 21 11 Key 11 ...

Страница 3: ...l strip 13 Wiring diagram 13 Tools 13 Basic settings Factory setting 14 Establishing active measuring range control range 14 Troubleshooting Indication diagnosis and remedy 18 Maintenance Safety note 19 Cleaning the electrode rod 19 Removing and disposing of the level electrode Removing and disposing of level electrode NRG 26 21 19 ...

Страница 4: ...f the electrode is installed inside the boiler or vessel a protection tube provided on side ensures correct functioning see section Examples of installation page 10 The level electrode can be installed together with one GESTRA level electrode for water level limiting or for high level alarm in a single protection tube or external level pot Safety note Danger When loosening the level electrode stea...

Страница 5: ...rs 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 The equipment meets the requirements of Directives UL 508 and CSA C22 2 No 14 13 Standards for Industrial Control Equipment File E243189 Note on the Declaration of Conformity Declaration by the Manufacturer For details on the conformity of our equi...

Страница 6: ...14 1319 1423 1528 1636 2156 Measuring range 1100 1200 1300 1400 1500 2000 Weight Approx 1 8 kg NRG 26 21 L 1000 mm Electronic module NRV 2 29 Supply voltage 12 V DC Response sensitivity Range 1 Water 0 5 µS cm Range 2 Water 20 µS cm Range 3 Fuel oil EL εr 2 3 Output 0 7 V DC level proportional Adjustors 1 Code switch with 6 poles for setting the measuring range Housing PPO Noryl Electrical connect...

Страница 7: ...manual Name plate marking Equipment designation Safety note Disposal note CE Marking Type approval no Manufac turer Pressure rating thread type material number protection Application range Fig 1 Material number Technical Data continued TÜV WR XX 317 XX 320 XX 425 426 427 NRG 26 21 continued Approvals TÜV certificate VdTÜV Bulletin Water Level 100 Requirements made on water level limiting control e...

Страница 8: ... 5 260 42 2 37 26 3 G A ISO 228 1 Thermal insulation provided on site d 20 mm outside of thermal insulation of steam boiler 2 Joint ring 27 x 32 form D to DIN 7603 made from 2 4068 bright annealed Key 3 Electrode thread 4 Measuring range mm xxx 5 Max length of installation at 238 C 1 4 5 15 ...

Страница 9: ... on the vessel must be accurately machined Fig 3 Do not bend electrode tip when mounting Do not subject electrode to physical shocks Use only the supplied joint ring Joint ring 27 x 32 form D DIN 7603 2 4068 bright annealed Do not lag electrode body above the hexagonal section Do not insulate electrode thread with hemp or PTFE tape Do not apply conductive paste or grease to the electrode thread Ob...

Страница 10: ...on inside the boiler Fig 6 Protection tube provided on site for installation inside the boiler and in combination with other GESTRA equipment 2 20 DN 50 G 20 20 90 c 9 6 7 8 0 a e f DN 100 24 5 24 5 20 G 20 90 3000 1 6 e h 7 d g 9 0 c 20 20 20 10 DN 50 G 20 3000 9 6 7 0 a e f 90 14 Fig 7 External level pot DN 20 DN 20 Centre distance 20 G DN 20 20 6 0 9 e h 8 8 190 ...

Страница 11: ...ip a Protection tube DN 80 in France according to AFAQ DN 100 b Protection tube DN 100 c Distance between electrode rod and protection tube 14 mm d Distance between electrode tip NRG 1 50 or NRG 1 51 14 mm creepage distances and clearances e Low water LW f Reducer DIN 2616 2 K 88 9 x 3 2 42 4 x 2 6 W f Reducer DIN 2616 2 K 114 3 x 3 6 48 3 x 2 9 W h Level pot DN 80 Key continued DN 100 45 m ax 688...

Страница 12: ...minal box k i o n m j l p q NRV 2 29 CEP i Screw M4 j Cover k Seal l Terminals m Cable gland M 16 PG 9 Key n Sealing plate o Terminal box electronic module NRV 2 29 p Code switch q Wiring of terminals 0 V 7 V DC Measuring voltage 12 V DC Supply voltage for NRV 2 29 1 M 3 Fig 9 ...

Страница 13: ...4 Unscrew cable gland m 5 Pull cable through cable gland m in terminal box o and wire terminals l in accordance with wiring diagram Fig 9 6 Replace cover j and insert screw i 7 Put terminal box o onto level electrode and fix it with screw i Wiring diagram n Please observe the instructions given in the installation operating manual for the level switches controllers NRS 2 50 NRS 2 51 NRR 2 50 NRR 2...

Страница 14: ...nge 1500 mm up to 2500 mm Code switch r position 2 ON 1 3 4 5 6 OFF X Selected active measuring range mm 4 Measuring range mm xxx see Fig 2 s Lower end of measuring range adjustable t Upper end of measuring range adjustable u Diagram for water conductivity 20 µS cm v Diagram for water conductivity 0 5 µS cm w Diagram for fuel oil EL dielectric constant εr 2 3 Lower measuring point Attention If X i...

Страница 15: ...land remove cover j 2 Fill vessel to required maximum level and connect a voltmeter between terminals 1 and M Before starting the measurement set all toggle switches of the code switch to OFF 3 Now operate each individual switch in turn only switch 1 to ON only 2 to ON only 3 to ON only 4 to ON only 4 5 to ON and only 4 5 6 to ON As soon as with one of the switch positions the value measured by th...

Страница 16: ...Output voltage U M V DC A completely submerged B completely exposed 7 6 5 4 3 2 1 0 200 400 600 800 1000 1200 1400 1600 1800 2000 0 2 ON 3 ON 4 ON 4 5 ON Code switch A A A A B B B B Selected active measuring range mm Output voltage U M V DC A completely submerged B completely exposed Fig 14 v Fig 15 w Diagram for water conductivity 0 5 μS cm Diagram for fuel oil EL dielectric constant εr 2 3 conti...

Страница 17: ...connected level switch level controller The level proportional voltage UM can be measured between terminals 1 and M Raise level in vessel to the highest point completely submerged of the selected active measuring range e g 1000 mm and measure the voltage Compare the value measured with the value of the corresponding chart in diagram u UM for 1000 mm is 4 6 V The following values must be obtained i...

Страница 18: ...evel pot optional are closed Open isolating valve The desired lower measuring point is outside the measuring range of the level electrode The level electrode is too short Install a sufficiently long level electrode The adjustment of the measuring range is wrong Correct code switch h settings See Basic Settings The electrode rod is covered with dirt deposits Remove level electrode and clean the ele...

Страница 19: ...bar The level electrode 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 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 re...

Страница 20: ...world www gestra com 818774 05 07 2017cm 808388 11 GESTRA AG Bremen Printed in Germany GESTRA AG Münchener Straße 77 28215 Bremen Germany Telefon 49 421 3503 0 Telefax 49 421 3503 393 E mail info de gestra com Web www gestra de ...

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