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NBK-01 

page 8 

 

NBK-01 K05/0322 

7. Electrical Connection 

7.1  Limit contacts NBK-R 

 

 

Attention! 
Observe the allowed electrical ratings for the limit switch.  

 
 

Maximum values 

NBK-R

 

 

Standard contact 

Switching capacity: 

60 W/VA 

Switching current:

1 A

Switching voltage: 

230 V

AC/DC

 

 

Install the switch (if available) according to the diagram and 
connect it to the electrical controller. 

 

When switching inductive loads, such as contactors, relays, 
etc., electrical limit values should not, also temporarily, be 
exceeded by e.g. voltage peaks. The use of a contact 
protection relay is recommended to avoid overloading the 
reed contacts.  
 

 

Содержание NBK-01

Страница 1: ...Operating Instructions for Bypass Level Indicator with Threaded Connection Model NBK 01 ...

Страница 2: ...on 6 7 Electrical Connection 8 7 1 Limit contacts NBK R 8 7 2 Transducer Magnetostrictive transducer with 4 wire transmitter 9 8 Commissioning 10 9 Trouble Shooting 11 10 Maintenance 11 11 Technical Information 12 12 Order codes 13 13 Dimensions 14 14 EC Declaration of Conformance 15 Manufactured and sold by Kobold Messring GmbH Nordring 22 24 D 65719 Hofheim Tel 49 0 6192 2990 Fax 49 0 6192 23398...

Страница 3: ...revention of accidents When used in machines the measuring unit should be used only when the machines fulfil the EC guidelines Classification according to Pressure Equipment Directive 2014 68 EU NBK 01 Category assignment for dangerous media from diagram 1 Density kg dm PN bar Category ML mm Category ML mm Category ML mm NBK 01 1 0 16 Art 4 Para 3 317 Cat I 945 Cat II 4711 0 9 0 8 0 7 0 6 0 54 207...

Страница 4: ...ition is always vertical The NBK should only be used for liquids with the medium density specified on the nameplate Otherwise the indication will deviate float too high or submerged Vessel inner pressure and medium temperature should not exceed the specified maximum values as this can lead to the destruction and malfunction of the bypass system It is imperative that the materials used are compatib...

Страница 5: ...c roller indicator As the float passes by the red white rollers are rotated in succession by 180 around their own axes The rollers change from white to red as the level rises and from red to white as the level falls The advantage of ball displays is the higher protection category good visibility of 180 and higher vibration resistance with filled version The level in a tank or a mixer is continuous...

Страница 6: ...e subjected to constant shock or strong vibrations it is recommended that the instrument is secured with rubber damped tube clips No welding is allowed on the bypass tube Mount and tighten the magnetic roller indicator if not already mounted on the bypass tube with the two provided ribbon clamps Mount and tighten the reed switch if available on the bypass tube at the opposite side of the roller in...

Страница 7: ...rictive Transmitter Mount and tighten the remote sensor if available and not already mounted on the bypass tube with the ribbon clamps The remote sensor must fully cover both process connections The cable terminal box is situated at the top ...

Страница 8: ...city 60 W VA Switching current 1 A Switching voltage 230 VAC DC Install the switch if available according to the diagram and connect it to the electrical controller When switching inductive loads such as contactors relays etc electrical limit values should not also temporarily be exceeded by e g voltage peaks The use of a contact protection relay is recommended to avoid overloading the reed contac...

Страница 9: ...ctrical supply lines are powerless To avoid faults caused by electrical fields from other circuits the cables should not be installed adjacent to other high voltage power lines Unscrew cover and run supply lines through cable gland Connect the remote sensor to the electronics according to the following wiring diagram ...

Страница 10: ...Function of switches All switches have three connection poles black 2 blue 1 and brown 3 The black wire 2 is the common pole for both switching functions N C and N O contact The float must pass the switch once in both directions so that the switching function is in line with the terminal connection diagram and table below These instructions are often ignored when an alarm lamp is connected directl...

Страница 11: ...y installed with the marking TOP upturned Check if dirt deposits in the bypass tube are blocking the float 10 Maintenance The drain plug should be opened occasionally to wash out any deposits in case the liquid to be measured contains dirt particles which could settle in the bypass tube If crust formation or crystallisation has taken place the tank must be emptied or shut off the lower cover flang...

Страница 12: ...cation aluminium section with polypropylene rollers max 120 C Protection IP54 Limit contacts model NBK R Contact operation bistable changeover contact Switching hysteresis approx 15 mm Max Switch capacity 60 W VA 230 VAC DC 1 A Resistance 100 m Medium temperature max 100 C Ambient temperature 40 C 75 C Connection 3 m PVC cable Housing polycarbonate Protection IP 67 Magnetostrictive sensor with 4 w...

Страница 13: ...0TA 1 kg dm3 0 9 1 18 kg dm3 with roller indication and transmitter NBK 01 RPTA 0 8 kg dm3 0 78 0 88 kg dm3 with roller indication NBK 01 RP0C 0 8 kg dm3 0 78 0 88 kg dm3 with transmitter NBK 01 00TC 0 8 kg dm3 0 78 0 88 kg dm3 with roller indication and transmitter NBK 01 RPTC Standard limit contact NBK 01 R Please replace the dots in the order number with the connection code R15 R R20 R R25 R1 R...

Страница 14: ...NBK 01 page 14 NBK 01 K05 0322 13 Dimensions in mm ...

Страница 15: ...945 Cat I 5500 Cat II 24795 0 9 0 8 0 7 0 6 0 54 835 5500 24685 ATTENTION If the calculated bypass length is exactly within the range limit then the stricter test method must be used The limit contacts NBK R for bypass level indicators are in conformity with the standards noted below EN 61010 1 2011 07 Safety requirements for electrical measuring control and laboratory instruments Part 1 General r...

Страница 16: ...illed 2014 30 EU EMC Directive 2014 35 EU Low Voltage Directive 2011 65 EU RoHS category 9 2015 863 EU Delegated Directive 2014 68 EU PED Module D marking CE0575 Notified body DNV GL Certificate No PEDD000000R Hofheim 15 Oct 2021 H Volz M Wenzel General Manager Proxy Holder ...

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