Operating Instructions for Level Switch Tuning Fork Principal Model
Contents
1. NWS 2E ATEX Delay Viscosity Hysteresis Repeatability Weight NWS K05 0912 NWS 10 Technical Information stainless steel 1 4404 stainless steel 1 4404 NWS 200 PAG glass fibre reinforced cover with window 330 rotatable all other types stainless steel 1 4301 Pipe thread DIN EN 10226 1 NPT thread Tri Clamp Pipe connection DIN 11851 sanitary connection Aseptic connection DIN 11864 DRD flange Flange B 25 PN 40 DN 2527 Flange B 50 PN 40 DN 2527 Flange ANSI B 16 5 1 300 Ibs Flange ANSI B 16 5 2 300 Ibs plastic housing IP 65 NWS 200 stainless steel housing plug connection IP 67 stainless steel housing cable connection IP 68 45 bar Flange connection see pressure steps 130 C NWS 200 90 C for all other NWS short time 150 C for CIP valid for all models NWS 0 8 kg L lower on request 20 C 70 C 24 240 Vocrac 50 60 Hz 2 wire 24 Voc 3 wire 24 Voc 3 wire Isolation Switching Amplifier to IEC 60947 5 6 Namur necessary for example REL 6 1 s wet dry 1 s dry wet 5000 mms max at 25 C influence on the response time 4 mm vertical 1 mm horizontal 1mm at ambient temperature 0 5 kg for R and 4 NPT Page 15 NWS Electrical Connection NWS 200 cable connection M 16 x 1 5 terminal max 1 5 mm 26 14 AWG capacity 0 4 A max at room temp min switching current 7 5 mA leakage current in2. 4 Test Function NWS 20 Through the pressing and holding of the setup button independent of the state of NWS the switching output can be temporarily switched off During the test phase the LED blinks rapidly Releasing the button returns the NWS after ca 3 sec to the current operating condition 9 2 Settings for NWS 23 24 2W 2H 9 2 1 Signalling the operating status The NWS has an output status indicator with an LED monitor that can be viewed continuously through a lense in the cover The LED flashes approximately once every second when the NWS is off It is continuously illuminated when the NWS is switched on The LED provides visual confirmation that the NWS is operating correctly and that the status of the wet side is correctly displayed With its oper ating mode switch the NWS can be set to operate as either an N C contact or an N O contact 9 2 2 Selecting operating mode By reversing the polarity of the power supply the switching function of the NWS 23 24 can be changed from an N C contact to an N O contact In the case of the NWS 2W 2H WHG the switching function cannot be changed for reasons of safety This electronic switch opens in case of wetting a faulty sensor or a power failure 9 2 3 Calibration mode Each appliance is adjusted by the factory to record fluids with density 1 0 kg l water It is not usually necessary to alter this pre adjustment In extreme Page 12 NWS K05 0912 NWS situations ho
3. T50 2HS 24 Voc WHG NPN plug M12x1 iic s 197 2ES ATEX approval plug M12x1 0300 300 mm sensor Sanitary DN 40 DIN 11851 NWS L40 Sanitary DN 50 DIN 11851 NWS L50 st Steel housing cable connect 0500 500 mm sensor Aseptic connection 23F 24 Vpc PNP 1 5 m cable DN 50 DIN 11864 24F 24 Voc NPN 1 5 m cable 1000 1000 mm sensor DRD 125 mm flange NWS D1Z 2WF 24 Voc WHG PNP 1 5 m cable 2HF 24 Voc WHG NPN 1 5 m cable XXXX please specify Special connection NWS YYY 2EF ATEX approval 1 5 m cable special length 4 position in mm max 3000 mm only models marked with are available with sensors in extended version WHG approval in preparation 12 Service and Maintenance The functional behaviour of these devices is stable even over long periods or time Regular adjustments or similar procedures are not required No maintenance of any type is required In the event that device faults are noted this device should be immediately removed from service The device contains no user serviceable parts Return the device to the manufacturer for examination 13 Trouble Shooting Devices that are operated in hazardous areas must not be modified in any way Repairs must be performed by trained qualified service personnel only Defective devices should normally be returned to the manufacturer for examination NWS K05 0912 Page 17 NWS 14 Recommended Spare Parts
4. off state lt 3 5 mA constant voltage drop ca 6 V 2 wire connection NWS 23 24 2W 2H connector M12x1 4 pole or 1 5 m fixed cable 3 pole switching output O C PNP or NPN factory set max 300 mA short circuit proof contact function N C or N O adjustable by switching polarity of supply voltage only NWS 23 24 Overload cut off NWS 2x In case of thermal overload or excessive current the unit cust off the load The triggering of overload protection is indicated by fast blinking of the LED NWS 2E ATEX connector M12x1 4 pole or 1 5 m cable 2 wire NAMUR output N C or N O selectable N C gt 2 1 mA discovered lt 0 8 mA covered N O lt 0 8 mA discovered gt 2 1 mA covered Page 16 NWS K05 0912 NWS 11 Order Codes Example NWS R20 20 0 0000 Connection Model Electrical connection R 34 male thread NWS R20 0060 60 mm only for R 1 male thread NWS R25 Plastic housing NWS T NWS L NWS H NPT male thread NWS N20 200 24 240 Vacipc 1 NPT male thread NSW N25 cable gland terminal connect 0070 70 mm DIN flange DN 25 NWS F25 l standard version short DIN flange DN 50 NWS F50 St steel housing plug connect not for NWS T NWS L 1 ANSI flange NWS A25 23S 24 Voc PNP plug M12x1 7 x 24S 24 Voc NPN plug M12x1 0117 117 mm 2 ANSIflange NWS A50 FE 2WS 24 Voc WHG PNP plug M12x1 extended Tri Clamp DN 40 NWS T40 ee Tri Ci DN 50 NWS
5. to get to the submenu e Hysteresis Level 1 approx 1 1 5mm LED flashes briefly 1x then LED 2 seconds off e Hysteresis Level 2 approx 3 4 5mm Standard LED flashes briefly 2x then LED 2 seconds off e Hysteresis Level 3 approx 5 7 5mm LED flashes briefly 3x then LED 2 seconds off NWS K05 0912 Page 11 NWS The choice of options is repeated in an infinite loop To select an Hysteresis Level the Setup button must be activated after the flashing of the relevant LED Three quick flashes of the LED signal that an option has been selected then the switch back to the main menu is made LED Mode The LED Mode is signalled by LED briefly 3x off then LED 2 seconds on Briefly activate the Setup button in order to attain the option menu LED Mode e LED Mode 1 Standard LED flashes briefly 1x then LED 2 seconds off LED shows the status of the switch output e LED Mode 2 LED flashes briefly 2x then LED 2 seconds off LED indicates whether the tuning fork is wetted or not The choice of options is repeated in an infinite loop In order to select an LED Mode the button must be briefly activated after the relevant flashing of the LED Three quick flashes of the LED signal that an option has been selected When the LED Mode has been successfully selected the switch back to the main menu is made In order to leave the calibration mode the appliance must be separated from the voltage supply for approx 10 seconds 9 1
6. 912 Page 23 NWS We confirm the correctness of the translation from the German orisinal In the tase of arbitration onty dhe German wording shall be valid and binding 44509 Bochum 18 ecember 20103 BYS Sehu kw E2605 403 Deutsche Montan Technologie GmbH E S Le ot fe Ke NN CER lication body Special servic ic ra Page 24 NWS K05 0912
7. 994 EN 50284 1999 Also the following EEC guidelines are fulfilled 2004 108 EC Electromagnetic compatibility 2006 95 EC Low voltage guideline 94 9 ECEquipment and Protective systems intended for use in a potentially Explosive Atmospheres ATEX 100a Quality Management Production Certificate number BVS 09 ATEX ZQS E110 Notified body DEKRA Exam GmbH Identification number 0158 H Peters M Wenzel General Manager Proxy Holder Hofheim 30 Sep 2010 NWS K05 0912 Page 21 NWS Translation EC Type Examination Certificate 2 Directive 94 9 E Equipment and protective systems intended for use in potentially explosive atmospheres 33 BYS 03 ATEX E 119 di Equipmeqi Vibrating fork type NYYS 42p0 4443 3 Manufacturer KOBOLD Messrine GmbH 6 Address D 63719 Hotheim Ts 7 The design and eoustruction af this equipment and any acceptable variation thereto are specified in the schedule To this type examnatina certificate KR The certification body of Deutsche Montan Technologie GrabH notified body na 0158 in accordance with Article 9 of the Dhrective 94 9 EC of the European Parliament and the Councit of 23 March 1994 certifies thar this cauipment has been found to comply with the Essential Health and Safety Requirements relating to the drein and construction of equipment and protective systems intended for use in potentially explosive ulmospbercs given in Annex H to the Directive The examination an
8. Operating Instructions for Level Switch Tuning Fork Principal Model NWS KEN u O NWS 1 Contents ETE NN 2 N ved 3 9 NSTUMENLINSPEN ee EE SE 3 A er ede So EE EE EE 3 9 Opeltatind PINE siai NENNE 4 6 Use in Hazardous Areas NW ZE 4 6 1 Device TUNE TOM ee EE N 4 62 GENea 5 oS MMEBI eje m m D 6 4 Temperature resislance nennen nnne 5 7 Mechanical Connechon nene nnne rne nnns 6 8 Blecihcal CONNECTION bes 7 o ME AD MEM 7 8 2 NWS 23 24 NWS 2W 2H NWS 2E ATEX certification 9 G Se TT 10 9 1 SeWINGS Ee eelere 10 9 2 Settings for NWS 23 24 2WI 2H ese ee se ee EE ee Ee Ee Ee EE ee ee nnns 12 9 3 Settings for NWS 2E ATEX Certification iese ee ee ee ee ee 14 10 TSUNA GAL NV COMI Le EE bd a iate epo 15 TV Order GOES ie Ms AE EE AEE 17 12 SEMICE and Maintenance ER re LM OH Wr DE Ge ER Ged DER EN CUR DE 17 13 Trouble eet ue EE 17 14 Recommended Spare Hate 18 DDE UNN 18 BDS 19 17 D claration or Gontormidll6e ve 21 Manufactured and sold by Kobold Messring GmbH Nordring 22 24 D 65719 Hofheim Germany Tel 49 0 6192 2990 Fax 49 0 6192 23398 E mail info de kobold com Internet www kobold com Page 2 NWS K05 0912 NWS 2 Note Please read these operating instructions before unpacking and putting the unit into operation Follow the instructions precisely as described herein The devices are only to be used maintained and serviced by pers
9. Setup button must be activated and held then the supply voltage must be switched on After approximately 1 second the LED goes on after 2 seconds the LED goes out then let go of the Setup button the appliance stays now in the main menu of the calibration mode Do Not C Remove Cover VC Setup There is a choice of options in the main menu Switchpoint Calibration Hysteresis Level and LED Mode The LED indicates the selected option e Switchpoint Calibration LED flashes briefly 1x then LED 2 seconds off e Hysteresis Level LED flashes briefly 2x then LED 2 seconds off e LED Mode LED flashes briefly 3x then LED 2 seconds off The option points are repeated in an infinite loop In order to get access to an option the Setup button must be activated briefly when the LED has signalled the requested option point Switchpoint Calibration The Switchpoint Calibration Mode is signalled by LED 1x briefly off then LED 2 seconds on Dip the tuning fork as far as the required switchpoint 1 2 2 3 of the fork length in the medium and activate the Setup button The calibration is made A successful calibration is signalled by the LED flashing quickly three times Hysteresis and LED Mode are set back to default After calibration the switch back to the main menu takes place Hysteresis Level The Hysteresis Level Mode is signalled by LED 2x briefly off then LED 2 seconds on Briefly activate the Setup button
10. There are no recommended spare parts If the device becomes defective it usually means that there is a fault in the device electronics that must be diagnosed and repaired In this case we recommend that the device be returned to the manufacturer for servicing 15 Disposal Disposal of packaging and used parts shall be done in conformance with the regulations of the country in which the device is installed Page 18 NWS K05 0912 NWS 16 Dimensions NWS 200 24 VAC DC Plastic housing ca 84 NWS 239 24S8 NWS 23F 24F NWS 2WS 2HS NWS 2WF 2HF 24 Vpc 24 Vpc Plug connection Terminal connection 40 40 RN NWS 2ES NWS 2EF ATEX ATEX Plug connection Cable connection 40 123 5 NWS K05 0912 Page 19 NWS NWS R20 N20 NWS R25 N25 Standard short NWS N25 0117 NWS F NWS A NWS T Flange version Tri clamp ca 36 L3 12 LD NWS L NWS H Sanitary connection Aseptic connection DIN 11851 DIN 11864 Page 20 NWS K05 0912 NWS 17 Declaration of Conformance We KOBOLD Messring GmbH Hofheim Ts Germany declare under our sole responsibility that the product Level Switch model NWS to which this declaration relates is in conformity with the standards noted below EN 61010 1 2002 EN 61326 A2 2006 Additional for model NWS 2E EN 50014 1997 A1 A2 EN 50020 1
11. back to default After calibration the switch back to the main menu takes place Hysteresis Level The Hysteresis Level Mode is signalled by LED 2x briefly off then LED 2 seconds on Activate by placing the test magnet briefly to get to the submenu e Hysteresis Level 1 approx 1 1 5mm LED flashes briefly 1x then LED 2 seconds off e Hysteresis Level 2 approx 3 4 5mm Standard LED flashes briefly 2x then LED 2 seconds off e Hysteresis Level 3 approx 5 7 5mm LED flashes briefly 3x then LED 2 seconds off The choice of options is repeated in an infinite loop To select an Hysteresis Level the test magnet must be placed briefly after the flashing of the relevant LED Three quick flashes of the LED signal that an option has been selected then the switch back to the main menu is made LED Mode The LED Mode is signalled by LED briefly 3x off then LED 2 seconds on Briefly activate the Setup button in order to attain the option menu LED Mode e LED Mode 1 Standard LED flashes briefly 1x then LED 2 seconds off LED shows the status of the switch output e LED Mode 2 LED flashes briefly 2x then LED 2 seconds off LED indicates NWS K05 0912 Page 13 NWS whether the tuning fork is wetted or not The choice of options is repeated in an infinite loop In order to select an LED Mode the test magnet must be placed briefly after the relevant flashing of the LED Three quick flashes of the LED signal that an optio
12. d test results are recorded in the test and assessment report BYS PP 03 2083 EG 91 The Essential Health and Safety Requirements are assured by compliance with EN 5300 31 19972 A2 General requirements EN 20020 VEE Intrinsic safety 1 EN 50284 1999 Equgpuenl Group IE Category 1 10 If the sign A is placed after the eertifeate number it indicates that the equipment 18 subject Fa special conditions for safe use specified ia the schedule ta this certificate 115 Thus EO Yype Lxamination Certificate relates only to the design examination and tests of the specified equipment Di accordance te Directive 885 57 UC Further requirements of the Directive apply to the manufacturing process and supply of this equipment These ao not covered by thes certificate 123 The marking of the equipment shall inelude the fellow Ex HIG EEx ia IC T6 Deutsche Montan Technologic GmbH Bochum dated 09 May 2003 Sipned Dickt Signed Amol DMT Certification body special services uui Fame fol Sor HYS AVE KEIER Pip cen Life les are ds he pepradused 1 rs ene ees silk vie Hnneadaalstrass2 89 44544 Boru Cer Prone LAN 201 171 1937 Fax 49 201 172 3948 doit 31 05 20037 Deviscae Wiona Technolog rib Anm Tecknologiepark 45507 Bsaet German Page 22 NWS K05 0912 NWS 13 Appendix to 04 EC Type Examination Certificate BVS 03 ATEX E 119 il 5 15 1 Subject and type Vibrating fork type IN WS 99w ia ns x fnstead of the in dhe compler
13. e derenunatien numerals and figures will be inserted which characterize different variitiaas type NWIS ZR zg i LEE Sensor lengih in men clertrical connection gt plug F permanently connected cable nar nn sa Process connection 5 2 Description The vibrating fork is used for measurement of liquid level The electrical components of the sensor are completely encapsulated in a metal enclosure The cieetrical connection Is by plug type IN WS 258 ora permanently connected cable type NWS 2 Lie een with a length up to 1 5 rn 18 3 Parameters Voltage Ui DE NI V Current li 106 MA Power Pi 1 Ww eitective internal capacitance CE nl effective internal induetanec Li negligible Ambient temperature range Ta 40 C np to 70 C The possible medium temperature and he allocation of the temperature class ig shown in the fotlowite table TI UTEM Ee sae mur EE reden T Temperature clas TS 14 13 bh el Tunet Ia n na el dl PE 16 Test and assessment report M rrr BYS PP 03 2083 EG as of 09 05 2003 T Spectal condibuns for safe use Mone Pe PR NR e mm sl den ee Pape 2of dig AVE ATEX EILS Lia centi feats may oe by teprodserd i3 iis onie 2nd witnoul chan me Inn apos tasuer EES Boca Germans on 49 20 E72 3947 Fax 449 301 172 1948 pentil 2 034002 Dense Mantan Teshnslagie GmbH Am Teeliaalogiepaak I 48507 Esse Tierinauy NWS K05 0
14. ff It is continuously illuminated when the NWS is switched on The LED provides visual confirmation that the NWS is operating correctly and that the status of the wet side is correctly displayed With its oper ating mode switch the NWS can be set to operate as either an N C contact or an N O contact 9 1 2 Operating mode selector switch The operating mode switch is positioned on the circuit board on the right about the LED If the switch is operated as an N C contact upper limiter the operating mode must be set to DRY ON in order to obtain the maximum fail safe behaviour The device completes the circuit in the dry state empty state so that a fault at the device or in the wiring results in a voltage drop that causes an alarm to be triggered break circuit Conversely if the switch is to WET ON the device operates as an N O contact lower limiter in fail safe mode in which case the fork is normally immersed in liquid Page 10 NWS K05 0912 NWS 9 1 3 Calibration mode Each appliance is adjusted by the factory to record fluids with density 1 0 kg l water It is not usually necessary to alter this pre adjustment In extreme situations however such as with very light fluids at high temperatures or highly viscous fluids which produce a significantly extended reaction time from 2 Mire dry to wet it can be advantageous to e i e alter the pre adjustment In order to PE L nc N SCR Load 0 PC attain the calibration mode the
15. hold voltages If you should have problems with this set ting please contact us for assistance Wiring diagram 3 wire Vs 24 Vpc output PNP Unico 20 V Uiow 3 5 V EN lt 400 mA e V 1 2 3 rv 4 Load Page 8 NWS K05 0912 NWS 8 2 NWS 23 24 NWS 2W 2H NWS 2E ATEX certification e Make sure that the electrical supply lines are de energised e Connect the device using the M12x1 plug or a connection cable as shown in the wiring diagram below e Matching connectors with different cable lengths are optionally available e Make sure that the installation is properly performed and that the IP protection level is maintained Wiring diagram NWS 23 24 24 Vpc Wiring diagram NWS 2W 2H 2 1 Vs GND Switch 3 4 Out Cable pin assignment Lead Pinnumber 2 2 ground NWS K05 0912 Page 9 NWS Wiring examples NW5 2E with Power supply unit acc to IEC 60947 5 6 Plug M12x 1 SC Isolation Switching E S no Amplifier IEC 6847 5 6 for example KFA KFD Cable 1 5 m Isolation Switching Lead No 1 Amplifier IEC 60847 5 6 Lead No 4 for example KFA KFD Lead No 2 Lead No 3 9 Settings 9 1 Settings for NWS 200 9 1 1 Signalling the operating status The NWS has an output status indicator with an LED monitor that can be viewed continuously through a lense in the cover The LED flashes approximately once every second when the NWS is o
16. ively numbered 6 4 Temperature resistance The values for ambient temperatures ranging from 20 C up to the values indicated in the following table apply to this sensor depending on the max temperature of the oscillating forks in the sensor Ambient temperature Medium temperature Temperature class NWS K05 0912 Page 5 NWS 7 Mechanical Connection During installation and removal recognised and applicable engineering practices and regulations shall be observed When working on electrical and pneumatic plants the special safety requirements shall be observed The NWS switch can be installed in containers or piping by screwing it into a threaded mounting flange or other type of mounting device The threaded con nection must be sealed with Teflon PTFE tape Be sure to turn the switch at the hexagonal drive do not install the switch by turning it at the housing After installation the NWS 200 can be rotated up to 330 to locate the M16 cable connection supplied with the device in a suitable position If the switch is installed in a horizontal position the tuning fork gap should be positioned vertically so that the liquid can drain from it If the liquid being moni tored is of high viscosity the switch should be installed so that it extends the maximum distance into the container or piping in order to prevent the thick liquid from sticking and accumulating between the fork and the container or pipe wall If the switch i
17. lity of the manufacturer The user assumes all risk for such usage NWS K05 0912 Page 3 NWS 5 Operating Principle The KOBOLD liquid level switch NWS is designed as a 2 and 3 wire switch and can be universally used in vessels and pipelines The NWS operates on the tuning fork principle in air at resonance frequency A piezoelectric crystal is used for excitation of oscillations and for monitoring the actual oscillation frequency When the fork is immersed in liquid the frequency changes this change is detected electronically and the output signal is changed The NWS operates as a two wire switch in series with the load The simple electronic switch is operated by the liquid The NWS can also be connected to a PLC through a third terminal Special Features The NWS has a switch status indicator with LED which can be seen continuously through a lens in the cover The LED flashes approximately once every second when the NWS has switched off and goes onto a permanent light when the NWS is switched on The LED is a visible confirmation that the NWS is working correctly and that the condition of the wet side is correctly indicated With a selector switch the NWS can be set either as an upper limiter or as a lower limiter 6 Use in Hazardous Areas NWS 2E 6 1 Device function The intrinsically safe NAMUR oscillating fork sensor is used to detect the fill levels of combustible and non combustible liquids The sensor is supplied with cur
18. n has been selected When the LED Mode has been successfully selected the switch back to the main menu is made In order to leave the calibration mode the appliance must be separated from the voltage supply for approx 10 seconds 9 2 4 Test function The magnet supplied with the device can be used to switch off the electrical output of the NWS independent of status of the tuning fork In this case the magnet must be placed on the location indicated on the device nameplate After approximately 2 seconds the NWS switches the output off and the LED begins blinking After the magnet is removed the output returns after 3 seconds to its previous state 9 3 Settings for NWS 2E ATEX certification 9 3 1 Signalling the operating status Signalling NAMUR output NIC LED flashes quickly N O LED flashes quickly 9 3 2 Selecting operating mode The choice of plug connector or cable pin assignment determines whether the level switch is operated as an N C contact or an N O contact see the section Electrical connection below 9 3 3 Calibration mode Each NWS 2E is adjusted by the factory to record a multitude of different fluids It is not possible to alter this pre adjustment Page 14 NWS K05 0912 Fork Process connection Electronic housing Process connections Protection Max operating pressure Max medium temp Min medium density Ambient temperature Power supply NWS 200 NWS 23 24 2W 2H
19. ons familiar with these operating instructions and in accordance with local regulations applying to Health amp Safety and prevention of accidents When used in machines the measuring unit should be used only when the machines fulfil the EWG 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 e Level Switch model NWS e Operating instructions 4 Regulation Use Kobold model NWS Liquid Level Switches are designed to be wired as 2 wire or 3 wire switches and can be universally installed in any position in containers and piping They can be used in many types of liquids including oils water paints and varnishes sauces milk carbonated liquids and foamy oils The liquid may have a maximum viscosity of 5000 cSt At higher viscosities the response time may increase NWS Liquid Level Switches are ideally suited for use in hygienic and sterile applications and designed to withstand CIP cleaning methods at tem peratures up to 150 C Any use of the device which exceeds the manufacturers specification may invalidate its warranty Therefore any resulting damage is not the responsibi
20. rent from a switching amplifier with an intrinsically safe output circuit in accordance with the NAMUR specification and behaves accordingly when the oscillating fork is dampened by liquid or can oscillate freely The sensor can be used in all zones in gaseous hazardous areas Page 4 NWS K05 0912 NWS 6 2 General The devices may be installed in zones 0 1 and 2 The intrinsically safe circuits must be installed by specialists in conformance with the applicable installation requirements certification document of installer protected routing of the intrinsically safe circuits etc The devices are constructed in accordance with protection type IP 65 If applicable they must be protected against adverse environmental conditions The EU model test certificates must be complied with Any special regulations contained in them must be followed The device should only be used for its intended use The connection with the associated and or intrinsically safe equipment must be separately checked The sensors must be grounded to discharge accumulated electrostatic charge At an ambient temperature area of 5 70 C the connected electrical cable may be mechanically moved Furthermore at an ambient temperature area of 20 70 C the electrical cable must be mounted in a fixed and static manner 6 3 Designation Model NWS 2E 1 G EEx ia IIC T6 BVS 03 ATEX E 119 DMT 0158 Production No SN E999999 consecut
21. s installed in piping the tuning fork gap should be positioned so that it is parallel to the pipe axis Page 6 NWS K05 0912 NWS 8 Electrical Connection Attention Be sure that the supply voltage of your system is the same as that specified on the device nameplate Make sure that the electrical supply lines are de energised when connecting the device 8 1 NWS 200 Series wiring with a 2 wire connection Please note e The switch must always be operated in series with a load e The switch must be grounded at terminal 1 e The switch draws a continuous operating current of less than 3 5 mA even when it is off For this reason it cannot be used for loads that do not allow an off current such as for gas discharge lamps e The maximum load current for the switch is 500 mA The user must provide suitable protective measures to ensure that this load limit is not exceeded Load current derating Load current mA 20 0 20 40 60 80 Ambient temperature C NWS K05 0912 Page 7 NWS Wiring diagram 2 wire 24 240Vacipc series load Imax 400mA PE Last el e N PLC connection with 3 wire connection Please note e An integral series resistance is used in the 3 wire circuit to generate a PLC compliant voltage signal e The signal can be picked up at terminal 4 e PLC programming devices or computers from various manufacturers will have different OFF thres
22. wever such as with very light fluids at high temperatures or highly viscous fluids which produce a significantly extended reaction time from dry to wet it can be advantageous to alter the pre adjustment In order to attain the calibration mode the test magnet must be placed at the label marking and held then the supply voltage must be switched on After approximately 1 second the LED goes on after 2 seconds the LED goes out then remove the test magnet the appliance stays now in the main menu of the calibration mode There is a choice of options in the main menu Switchpoint Calibration Hysteresis Level and LED Mode The LED indicates the selected option e Switchpoint Calibration LED flashes briefly 1x then LED 2 seconds off e Hysteresis Level LED flashes briefly 2x then LED 2 seconds off e LED Mode LED flashes briefly 3x then LED 2 seconds off The option points are repeated in an infinite loop In order to get access to an option the test magnet must be placed briefly when the LED has signalled the requested option point Switchpoint Calibration The Switchpoint Calibration Mode is signalled by LED 1x briefly off then LED 2 seconds on Dip the tuning fork as far as the required switchpoint 1 2 2 3 of the fork length in the medium and activate by placing the test magnet briefly The calibration is made A successful calibration is signalled by the LED flashing quickly three times Hysteresis and LED Mode are set
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