Kobold NRM Operating Manual

case of improper treatment of the described products. The document may contain technical inaccuracies and typographical errors. The content will be revised on a regular basis. These changes will be implemented in later versions. The described products can be improved and changed at any time without prior notice. © Copyright All rights reserved. 1. Contents 1.  Contents ........................................................................................................ 2 2.  Note .............................................................................................................. 4 3.  Instrument Inspection .................................................................................... 4 4.  Regulation Use ............................................................................................. 4 5.  Operating Principle ........................................................................................ 5 6.  Installation ..................................................................................................... 6 6.1 Mounting .............................................................................................. 6 7.  Wiring ............................................................................................................ 9 7.1 Wiring of the devices ......................................................................... 10 7.2 Determine the appropriate power supply voltage ............................... 11 7.3 Loop current checking with hand instrument ...................................... 12 8.  Programming .............................................................................................. 12 8.1 The NRM-300P display unit ............................................................... 13 8.2 Programming with the NRM-300P display module ............................ 16 8.3 Programmable features description ................................................... 18 9.  Error Codes ................................................................................................. 28 10. NRM Parameter table ................................................................................. 29 11. Menu map ................................................................................................... 30 12. Explosion protection, Ex-marking, Ex limit data .......................................... 32 13. Conditions of safe operation ....................................................................... 33 14. Maintenance ............................................................................................... 33 15. Technical Information .................................................................................. 34 16. Order Codes ............................................................................................... 35 17. Dimensions ................................................................................................. 37 18. EU Declaration of Conformance ................................................................. 40 19. EU Declaration of Conformance (ATEX) ..................................................... 41 20. ATEX certificate .......................................................................................... 43 21. IECEx certificate .......................................................................................... 50

Kobold Messring GmbH Nordring 22-24 D-65719 Hofheim Tel.: +49(0)6192-2990 Fax: +49(0)6192-23398 E-Mail: [email protected] Internet: www.kobold.com Edition: August 2017 (Revision 3)

operation. Follow the instructions precisely as described herein. The instruction manuals on our website www.kobold.com are always for currently manufactured version of our products. Due to technical changes, the instruction manuals available online may not always correspond to the product version you have purchased. If you need an instruction manual that corresponds to the purchased product version, you can request it from us free of charge by email ([email protected]) in PDF format, specifying the relevant invoice number and serial number. If you wish, the operating instructions can also be sent to you by post in paper form against an applicable postage fee. The devices are only to be used, maintained and serviced by persons familiar with these operating instructions and in accordance with local regulations applying to Health & Safety and prevention of accidents. When used in machines, the measuring unit should be used only when the machines fulfil the EC-machine guidelines. 3. Instrument Inspection Instruments are inspected before shipping and sent out in perfect condition. Should damage to a device be visible, we recommend a thorough inspection of the delivery packaging. In case of damage, please inform your parcel service / forwarding agent immediately, since they are responsible for damages during transit. Scope of delivery: The standard delivery includes:  Non-Contact Radar Level Transmitter model: NRM 4. Regulation Use Any use of the Non-Contact Radar Level Transmitter, model: NRM, which exceeds the manufacturer’s specification, may invalidate its warranty. Therefore, any resulting damage is not the responsibility of the manufacturer. The user assumes all risk for such usage.

The reflection of the emitted microwave impulses is considerably depending on the relative dielectric constant of the measured medium. The essential condition of microwave level measurement is that the relative dielectric constant (εr) of the medium should be more than 1.9. The operation of the non-contact microwave level transmitters is based on the measurement of the time of flight of the reflected signals, so-called Time Domain Reflectometry (TDR) method. The propagation speed of microwave impulses is practically the same in air, gases and in vacuum, independently from the process temperature and pressure, so the measured distance is not affected by the physical parameters of medium to be measured. The NRM level transmitter is a Pulse Burst Radar operating at 25 GHz (K-band) microwave frequency. The 25 GHz models’ most noticeable advantage over the lower frequency (5-12 GHz) radars are the smaller antenna size, the better focusing, lower dead-band and smaller transmission angle. The level transmitter induces few nanosecond length microwave impulses in the antenna and a part of the energy of the emitted signals reflects back from the measurement surface depending on the measured media. The time of flight of the reflected signal is measured and processed by the electronics, and then this is converted to distance, level or volume proportional data.