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GESTRA Steam Systems

GESTRA

NRG 2621

Installation Instructions 81877402

Level Electrode

NRG 26-2

English

Содержание NRG 26-21

Страница 1: ... GESTRA Steam Systems GESTRA NRG 26 21 Installation Instructions 818774 02 Level Electrode NRG 26 21 EN English ...

Страница 2: ...claration by the Manufacturer 4 Important Notes Page Explanatory Notes Scope of supply 5 System description 5 Function 5 Design 5 NRG 26 21 12 Attention 12 Note 12 Tools 12 Examples of installation 13 Key 14 Installation NRG 26 21 6 7 Name plate marking 7 Dimensions 8 Technical Data NRG 26 21 9 Key 11 Design NRG 26 21 10 Key 11 Functional Elements ...

Страница 3: ...nnection 20 Checking measuring voltages 20 Contents continued Commissioning Page Danger 22 Disposal 22 Decommissioning NRG 26 21 20 Note 20 Operation Fault finding list for troubleshooting 21 Operational Malfunctions Factory setting 17 Establishing active measuring range 17 19 Attention 17 Note 20 Basic Settings ...

Страница 4: ...sioned by qualified and adequately trained per sonnel Maintenance and retrofitting must only be performed by entrusted personnel who through adequate training have achieved a recognised level of competence 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 Atmosph...

Страница 5: ...e 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...

Страница 6: ...8 10 Screwed union 1 4571 CrNiMoTi17 12 2 Measuring electrode 1 4571 CrNiMoTi17 12 2 Electrode insulation PTFE Supply voltage 12 V Length supplied measuring range Max installation length at 238 C Measuring range 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 NRG 26 21 Technical Data ...

Страница 7: ...erature 70 C Weight approx 1 8 kg Name plate marking Fig 1 32 bar 464psi 238 C 460 F T amb 70 C 158 F NRG 26 21 Betriebsanleitung beachten See installation instructions Voir instructions de montage Pmax Tmax PN 40 G 3 4 1 4571 IP 65 Mat Nr GESTRA AG D 28215 Bremen TÜV WR WRS 09 317 TÜV WR 06 320 Equipment designation Safety note Disposal note CE marking Pressure rating thread type material number ...

Страница 8: ... Technical Data continued Dimensions Constant length no elongation Fig 2 42 37 26 280 ...

Страница 9: ... 1 Design Fig 3 Fig 4 N 1 N 10 0 5 33 DIN 228 NRG 26 21 2 4 3 ...

Страница 10: ...10 Functional Elements Fig 5 Preamplifier NRV 2 29 integrated in the terminal box 7 5 0 9 NRG 26 21 6 8 MAX 70 C MAX 95 IP 65 ...

Страница 11: ...rface 3 Joint ring D 27 x 32 DIN 7603 1 4301 4 Electrode thread DIN ISO 228 1 5 Screw M4 6 Cover 7 Seal 8 Terminal strip 9 Cable entry M16 PG 9 0 Sealing plate Terminal box with preamplifier NRV 2 29 Code switch Contact plate Max installation length at 238 C Measuring range Key Design Functional Elements ...

Страница 12: ... surface 2 of the electrode Fig 3 Use only joint ring of stainless steel 1 4301 D 27 x 32 to DIN 7603 supplied with electrode 3 Apply a light smear of silicone grease e g DOW Corning 111 Compound to electrode thread 4 4 Screw level electrode into threads or flange provided on vessel or boiler standpipe and tighten with a 41 mm open end spanner The torque required for tightening is 160 Nm when cold...

Страница 13: ...Installation continued Examples of installation DN 100 Fig 8 20 20 24 5 24 5 20 Fig 6 Fig 7 DN 50 90 DN 50 10 20 90 90 20 20 20 10 20 DN 20 DN 20 Fig 9 20 10 20 Centre distance a e f e c g b e DN 20 a e f ...

Страница 14: ... regulations must be considered Vent hole High water HW Electrode rod d 15 mm a Protection tube DN 80 b Protection tube DN 100 c Electrode distance 14 mm LW d Electrode distance 40 mm LW e Low water LW f Reducer DIN 2616 2 part 2 K 88 9 x 3 2 42 4 x 2 6 W g Reducer DIN 2616 2 part 2 K 114 3 x 3 6 48 3 x 2 9 W Key Installation continued ...

Страница 15: ...ities from 0 5 μS cm 1 Undo screw 5 Fig 5 2 Take the terminal box off the level electrode leaving the sealing plate 0 on the contact plate 3 Remove cover 6 with seal 7 4 Detach cable gland 9 from terminal box 5 Run cable through cable gland 9 of the terminal box and connect the terminals of the terminal strip 8 according to the wiring diagram 6 Replace cover 6 and insert screw 5 7 Put terminal box...

Страница 16: ...nge Adjust the preamplifier NRV 2 26 integrated in the terminal box to the operating conditions prevailing in your installation before putting the level electrode into operation Make sure that the measuring range setting is correct for your application and check whether the fluid to be controlled is electrically conductive or not before commissioning the electrode Wiring diagram Fig 10 0 V 7 V DC ...

Страница 17: ...ON 1 2 4 5 6 OFF n Measuring range 1500 mm to 2500 mm Code switch position 2 ON 1 3 4 5 6 OFF Lower measuring range 26 Attention n If X is clearly smaller than change the code switch according to the diagrams h i and j to adapt the setting to the fluid used in the installation Establishing active measuring range A control range may be established within the measuring range of the electrode Establi...

Страница 18: ...f the terminal box 2 Fill vessel until its max liquid level is reached and then connect a voltmeter between the terminals 1 and M Before starting the measurement set all switches of the code switch to OFF 3 Now operate each individual switch in turn first only 1 to ON then only 2 to ON then only 3 to ON then only 4 to ON then 4 5 to ON and then 4 5 6 to ON As soon as with one of the switch positio...

Страница 19: ...rol range mm 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 Active measuring range control range mm Output voltage U M V DC A completely submerged B completely exposed Fig 13 i Fig 14 j Diagram for water conductivity 25 μS cm Diagram for fuel oil EL dielectric cons...

Страница 20: ...M for 1000 mm is 4 6 V The following values must be obtained in any case Level electrode completely exposed UM 0 V level electrode completely submerged UM 7 V If the level electrode is submerged and UM 0 V or UM 7 V is measured the level electrode has to be checked in our service department Checking measuring voltages Operation Operation in steam and pressurised hot water plants in accordance with...

Страница 21: ...rotection Fault The desired zero point does not lie within the measuring range of the electrode The electrode is too short Remedy Replace the electrode Choose correct electrode length Fault Dirt deposits have accumulated on the electrode rod Remedy Remove the electrode and clean its rod with a wet cloth Fault The adjustment of the measuring range is incorrect Remedy Correct the code switch setting...

Страница 22: ...ts circuit 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 Before removing the level electrode make sure that the vessel or measuring pot are depressurised 0 bar and cooled down to room temperature 20 C ...

Страница 23: ...23 For your notes ...

Страница 24: ...ealpi 30 l 20032 Cormano MI Tel 0039 02 66 32 51 Fax 0039 02 66 32 55 60 E mail infoitaly flowserve com GESTRA ESPAÑOLA S A Luis Cabrera 86 88 E 28002 Madrid Tel 0034 91 5 15 20 32 Fax 0034 91 4 13 67 47 5 15 20 36 E mail aromero flowserve com España Flowserve GESTRA U S 2341 Ampere Drive Louisville KY 40299 Tel 001 502 267 2205 Fax 001 502 266 5397 E mail FCD Gestra USA flowserve com USA Portugal...

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