IKR 251 Operating Instructions
Contents
1. The protective cap will be needed for maintenance work 9 Make the flange connection When making a CF flange connection it can be advantageous to temporarily remove the magnet unit gt section 3 1 1 go DANGER overpressure in the vacuum system gt 2 5 bar KF flange connections with elastomer sealing rings e g O rings cannot withstand such pressures Process media can thus leak and possibly damage your health Use sealing rings provided with an outer centering ring DANGER overpressure in the vacuum system lt 1 bar If clamps are opened unintentionally injury can be caused by catapulted parts Use the type of clamps which can only be opened and closed by means of a tool e g hose clip clamping ring BG 5151 BEN 2011 01 IKR 251 9 PFEIFFER VACUUM The gauge must be electrically connected to the grounded vacuum chamber The connection must conform to the re quirements of protective connection according to EN 61010 e CF flanges fulfill this requirement e For gauges with KF flanges use a conductive metallic clamping ring WARNING electric arcing Helium may cause electric arcing with detrimental effects on the electronics of the product Before performing any tightness tests put the product out of operation and remove the electronics unit e Allen wrench AF 1 5 e Open end wrench AF 7 Unfasten the hexagon socket set screw 1 on the side of the electronics unit 2 gt F2. the gauge can be operated for more than one year without cleaning cleaning the gauge B 16 In general contamination of the gauge leads to deviations of the measured values e In the low pressure range p gt 1x10 mbar the pressure indication is usually too low as a consequence of the contamination of the cold cathode system In case of severe contamination instabilities can occur layers of the measuring chamber peel off Contamination due to isolating layers can even lead to a complete failure of the discharge Contamination can to a certain extent be reduced by e geometric protection e g screenings elbows against particles that spread rectilinearly e mounting the flange of the gauge at a place where the partial pressure of the pollutants is particularly low Special precautions are required for vapors deposited under plasma of the cold cathode measuring system It may even be necessary to temporarily switch of the gauge while vapors occur BG 5151 BEN 2011 01 IKR 251 1 3 PFEIFFER VACUUM 5 Maintenance Gauge failures due to contamination or wear and tear as well as expendable parts e g seals are not covered by the warranty DANGER contaminated parts Contaminated parts can be detrimental to health and environment Before you begin to work find out whether any parts are contami nated Adhere to the relevant regulations and take the necessary pre cautions when handling contaminated parts
3. 5 1 Cleaning the Gauge 9 9 DANGER Replacing Parts DANGER cleaning agents Cleaning agents can be detrimental to health and environment Adhere to the relevant regulations and take the necessary precautions when handling and disposing of cleaning agents Consider possible reactions with the product materials E 7 Tools material required e Allen wrench AF 1 5 e Allen wrench AF 3 e Open end wrench AF 7 e Pliers for circlip e Polishing cloth 400 grain or Scotch Brite e Tweezers e Cleaning alcohol e Mounting tool for ignition aid e Ignition aid e FPM seal 11 for anode feedthrough 14 BG 5151 BEN 2011 01 IKR 251 PFEIFFER VACUUM 5 1 1 Disassembling the Gauge Figure 3 Procedure 9 Remove the gauge from the vacuum system B 18 e Unfasten the hexagon socket set screw 1 on the side of the electronics unit 2 gt Figure 3 e Remove the electronics unit The cover of the electronics unit cannot be removed 0 Unfasten the hexagon head screw 3 on the magnet unit 4 and remove the magnet unit The magnetic force and the tendency to tilt make it more difficult to separate the magnet unit and the measuring chamber 7 e Remove the circlip 5 as well as the polarity insert 6 from the measuring chamber Q Remove the four or two hexagon socket screws 8 incl lock washers 8a on the back of the measuring chamber e Carefully remove the following items in this order
4. a indicates the operating state e Supply voltage present e No supply voltage Turn on the gauge only at pressures 10 mbar to prevent excessive contamination If you are using a Pfeiffer Vacuum measurement unit for Compact Gauges with at least two gauge connections the cold cathode gauge can be controlled for example by a Pirani gauge Gas type dependence The measuring signal depends on the type of gas being measured The curves are accurate for dry air N2 O2 and CO They can be mathematically converted for other gases Appendix B If you are using a Pfeiffer Vacuum measurement unit for Pfeiffer Vacuum Compact Gauges you can enter a calibration factor to correct the measurement value displayed LB of that measurement unit Ignition delay An ignition delay occurs when cold cathode gauges are switched on The delay time increases at low pressures and is typically 107 mbar 10 mbar 2x10 mbar 0 1 minute 1 minute 5 minutes u u u Contamination Gauge failures due to contamination or wear and tear as well as expendable parts e g seals are not covered by the warranty Gauge contamination is influenced by the process media used as well as any existing or new contaminants and their respective partial pressures Continuous operation in the range of 10 mbar 10 mbar can cause severe contamination as well as reduced up time and maintenance cycles With constantly low pressures lt 1x10 mbar
5. pressure piece 9 complete anode 10 FPM seal 11 incl support ring 12 The parts can now be cleaned or replaced BG 5151 BEN 2011 01 IKR 251 1 5 PFEIFFER VACUUM 5 1 2 Cleaning the Gauge Procedure 0 Using a polishing cloth rub the inside walls of the measuring chamber and the polarity insert to a bright finish The sealing surfaces must only be worked concentrically 9 Rinse the measuring chamber and the polarity insert with cleaning alcohol e Allow both to dry Cleaning or replacing the anode 0 Remove the old ignition aid 10a with tweezers Figure 3 e9 Using a polishing cloth rub the anode pin to a bright finish Do not bend the anode Do not carry out mechanical work on the ceramic part Rinse the anode with cleaning alcohol Allow the anode to dry Insert a new ignition aid 10a into the mounting tool 9 9 9 9 Carefully press the anode clean or new centered and parallel to the tool axis into the ignition aid and insert it to a depth of approx 15 mm The final positioning is established after the anode is installed Anode Ignition aid 4 Mounting tool 5 1 3 Reassembling the Gauge Procedure 0 Insert the FPM seal 11 with the support ring 12 centered into the measuring chamber The sealing surface seal and ceramic part must be clean Figure 3 e Carefully insert the anode 10 incl ignition aid 10a into the measuring chamber Care
6. Data 6 3 Installation 9 3 1 Vacuum Connection 9 3 1 1 Removing the Magnet Unit Only for Gauges With CF Flanges 10 3 2 Power Connection 11 3 2 1 Use With a Pfeiffer Vacuum Measurement Unit 11 3 2 2 Use With Another Evaluation Unit 11 4 Operation 13 5 Maintenance 14 5 1 Cleaning the Gauge Replacing Parts 14 5 1 1 Disassembling the Gauge 15 5 1 2 Cleaning the Gauge 16 5 1 3 Reassembling the Gauge 16 5 1 4 Adjusting the Gauge 17 5 2 What to Do in Case of Problems 18 6 Removing the Gauge From the Vacuum System 18 7 Returning the Product 19 8 Accessories 19 9 Spare Parts 20 10 Disposal 20 Appendix 21 A Measuring Signal vs Pressure 21 B Gas Type Dependence 23 For cross references within this document the symbol B XY is used for references to other documents the symbol Z BG 5151 BEN 2011 01 IKR 251 3 PFEIFFER VACUUM 1 Safety 1 1 Symbols Used y DANGER Information on preventing any kind of physical injury Information on preventing extensive equipment and environmental damage Information on correct handling or use Disregard can lead to malfunctions or minor equipment damage 1 1 2 Personnel Qualifications Skilled personnel All work described in this document may only be carried out by persons who have suitable technical training and the necessary experience or who have been instructed by the end user of the product 1 3 Safety Information e Adhere to the applicable regu
7. PFEIFFER VACUUM A PASSION FOR PERFECTION Compact Cold Cathode Gauge FPM sealed Operating Instructions BG 5151 BEN 2011 01 PFEIFFER VACUUM In all communications with Pfeiffer Vacuum please specify the information given on the product nameplate Pfeiffer Vacuum D 35614 Asslar VACUUM Compact Cold Cathode Gauge PFEIFFER This document applies to products with the following part numbers PT R25 500 DN 25 ISO KF flange PT R25 501 DN 40 ISO KF flange PT R25 502 DN 40 CF F flange The part number can be taken from the product nameplate We reserve the right to make technical changes without prior notice The Compact Cold Cathode Gauge IKR 251 has been designed for vacuum measurement in a pressure range of 2x10 1x10 mbar The IKR 251 can be used with a Pfeiffer Vacuum measurement unit for Compact Gauges or with another evaluation unit Over the whole measurement range the measuring signal is output as a logarithm of the pressure If functions with a cold cathode ionization measurement circuit according to the inverted magnetron principle BG 5151 BEN 2011 01 IKR 251 Product Identification Validity Intended Use Functional Principle PFEIFFER VACUUM Product Identification 2 Validity 2 Intended Use 2 Functional Principle 2 1 Safety 4 1 1 Symbols Used 4 1 2 Personnel Qualifications 4 1 3 Safety Information 4 1 4 Liability and Warranty 5 2 Technical
8. ble as spare parts sets Description Ordering number Maintenance set consisting of BN 846 239 T 1x support ring 1x O ring FPM75 10 82 x 1 78 3x ignition aid 1x O ring FPM75 3 69 x 1 78 not used with IKR Repair set including BN 846 252 T 1x support ring 1x O ring FPM75 10 82 x 1 78 1x anode complete 3x ignition aid Set of ignition aids including BN 845 995 T 10x ignition aid Mounting tool for ignition aid BG 510 600 Electronics unit IKR 251 BN 846 461 T Measuring system complete DN 25 ISO KF flange BN 846 462 T DN 40 ISO KF flange BN 846 463 T DN 40 CF F flange BN 846 464 T Exchange gauge return defective gauge to Pfeiffer Vacuum DN 25 ISO KF flange PT R25 500 A DN 40 ISO KF flange PT R25 501 A DN 40 CF F flange PT R25 502 A WARNING substances detrimental to the environment Products operating materials etc may have to be specially disposed of For environmentally compatible disposal please contact your nearest Pfeiffer Vacuum Service Center 20 BG 5151 BEN 2011 01 IKR 251 PFEIFFER VACUUM Appendix A Measuring Signal vs Pressure Conversion formulae 3 U ctlogiop mbar 10 5 ubar 7 5 Torr 10 625 mTorr 7 625 micron 7 625 Pa 8 5 kPa 11 5 where U Measurement signal valid in the range 2x10 mbar lt p lt 1x10 mbar p Pressure 1 5x10 Torr gt p lt 7 5x10 Torr c d Constant dependent 2x10 Pa p 1 Pa on pressure unit Conversion curves Pres
9. event damages Procedure 0 Deactivate the gauge 9 Unplug the connector 18 BG 5151 BEN 2011 01 IKR 251 PFEIFFER VACUUM 9 Detach the gauge from the vacuum apparatus 0 Place the protective cap SSS KS 6 gh oe N a S e 7 Returning the Product WARNING forwarding contaminated products Products returned to Pfeiffer Vacuum for service or repair should if possible be free of harmful substances e g radioactive toxic caustic or microbiological Otherwise the type of contamination must be declared Adhere to the forwarding regulations of all involved countries and for warding companies and enclose a completed contamination declara tion Form under www pfeiffer vacuum net Products that are not clearly declared as free of harmful substances are de contaminated at the expense of the customer 8 Accessories Ordering number Cable for connection to Pfeiffer Vacuum measurement unit for Compact Gauges 3m PT 44 850 T 6m PT 448 251 T 10m PT 448 252 T Socket Hirschmann GO 6 WF B 470 7283 MA 6 contacts angled female Magnetic shielding PT 443 155 X BG 5151 BEN 2011 01 IKR 251 1 9 PFEIFFER VACUUM 9 Spare Parts Always include the following information with your spare parts order e Type of product e Manufacturing number according to nameplate e Position description and ordering number according to spare parts list The following parts are availa
10. fully place the pressure piece 9 on the measuring chamber and tighten it uniformly with the four or two hexagon socket screws 8 incl lock washers 8a until the stop position is reached 16 BG 5151 BEN 2011 01 IKR 251 PFEIFFER VACUUM Position the ignition aid 10a by pushing the mounting tool over the anode pin until the mechanical stop is reached Remove the particles in the measuring chamber with dry nitrogen be careful to hold the measuring chamber with the flange pointing downwards Slide the polarity insert 6 into the measuring chamber up to the mechanical stop Place the circlip 5 snugly fitting on the polarity insert Visually check that the anode pin is centered over the middle hole of the polarity insert max eccentricity 0 5 mm If possible perform a leak test leak rate lt 10 mbar I s WARNING electric arcing Helium may cause electric arcing with detrimental effects on the electronics of the product Before performing any tightness tests put the product out of operation and remove the electronics unit Mount the magnet unit 4 and lock it with the hexagon head screw 3 Carefully slide the electronics unit 2 on the magnet unit until the mechanical stop is reached Fasten the electronics unit 2 by means of the hexagon socket set screw 1 DANGER Due to missing ground connection in conjunction with missing or not correctly tightened hexagon socket set screw 1 dange
11. igure 1 Remove the electronics unit Unfasten the hexagon head screw 3 on the magnet unit 4 and remove the magnet unit The magnetic force and the tendency to tilt make it more difficult to separate the magnet unit and the measuring chamber 7 Make the flange connection between the gauge and the vacuum system Remount the magnet unit and lock it with the hexagon head screw 3 Carefully mount the electronics unit 2 Push the electronics unit up to the mechanical stop and lock it with the hexagon socket set screw 1 BG 5151 BEN 2011 01 IKR 251 6 9 9 9 3 1 1 Removing the Magnet Unit Only for Gauges With CF Flanges Tools required Procedure 10 PFEIFFER VACUUM Figure 1 3 2 Power Connection 3 2 1 Use With a If the gauge is used with a Pfeiffer Vacuum Pfeiffer Vacuum measurement Measurement Unit unit for Compact Gauges a corresponding connection cable is required B 19 e Secure the cable at the gauge with the screw Compact Cold Cathode Gauge PFEIFFER VIQAM 3 2 2 Use With Another The gauge can also be operated with other evaluation units In this case an Evaluation Unit individual connection cable must be made For cable lengths up to 10 m with a conductor cross section of 0 34 mm the measuring signal can be read directly between the positive signal output pin 2 and the supply common pin 5 without the degree of accuracy being lowered For lo
12. lations and take the necessary precautions for the process media used Consider possible reactions between the materials B 7 and the process media Consider possible reactions of the process media due to the heat generated by the product e Adhere to the applicable regulations and take the necessary precautions for all work you are going to do and consider the safety information in this document e Before you begin to work find out whether any vacuum components are con taminated Adhere to the relevant regulations and take the necessary pre cautions when handling contaminated parts DANGER magnetic fields Strong magnetic fields can disturb electronic devices like heart pacemakers or impair their function Maintain a safety distance of 210 cm between the magnet and the heart pacemaker or prevent the influence of strong magnetic fields by antimagnetic shielding Pass on the safety information to other users 4 BG 5151 BEN 2011 01 IKR 251 PFEIFFER VACUUM Pfeiffer Vacuum assumes no liability and the warranty becomes null and void if the custodian or third parties disregard the information in this document use the product in a non conforming manner make any kind of changes modifications alterations etc to the product use the product with accessories not listed in the corresponding product documentation The custodian assumes the responsibility in conjunction with the process media
13. m flange measurement common Supply common signal common Materials exposed to the vacuum Feedthrough isolation Internal seals Flange Measuring chamber Anode Ignition aid Internal volume Dimensions mm Weight PT R25 500 DN 25 ISO KF BG 5151 BEN 2011 01 IKR 251 PFEIFFER VACUUM ceramic Al203 FPM75 stainless steel 1 4306 AISI 304L stainless steel 1 4104 Mo stainless steel 1 4310 AISI 301 VACUUM Compact ColdCathode Gauge VACUUM gt PFEIFFER PFEIFFER 20 cm DN 40 CF F DN 40 ISO KF 700 g DN 40 ISO KF flange 950 g DN 40 CF F flange BG 5151 BEN 2011 01 IKR 251 Materials exposed to the vacuum Feedthrough isolation Internal seals Flange Measuring chamber Anode Ignition aid Internal volume PT R25 501 DN 40 ISO KF PT R25 502 DN 40 CF F Dimensions mm Weight PFEIFFER VACUUM 3 Installation PI MEM Caution vacuum component Dirt and damages impair the function of the vacuum component When handling vacuum components take appropriate measures to ensure cleanliness and prevent damages The gauge can be mounted in any orientation However it should be mounted so that any particles present cannot penetrate into the measuring chamber gt B 13 See Technical data amp 6 ff for space requirements Procedure 0 Remove the protective cap
14. n
15. n compact connector type GO 6 6 pins male 5 poles plus screening 100 m 0 25 mm conductor 150 m 0 34 mm conductor 500 m 1 0 mm conductor lt 3 3 kV 500 A Electrical connection Cable Maximum cable length Operating voltage in the measuring chamber Operating current in the measuring chamber Pfeiffer Vacuum measurement and control units for Compact Gauges fulfill BG 5151 BEN 2011 01 IKR 251 these requirements PFEIFFER VACUUM 0 10 5 logarithmic increase 1 V decade gt Appendix A 0 5 V no supply 2x10 Q 100 ko 10 kQ short circuit proof pressure dependent lt 10 ms 1 5 5 1 KQ resistor referenced to supply common Figure 2 Figure 2 connected via 10 kQ max voltage differential with respect to safety 50 V with respect to accuracy 10 V conducted separately differential measurement recommended for cable lengths lt 10 m ceramic Al203 FPM75 stainless steel 1 4104 stainless steel 1 4104 Mo stainless steel 1 4310 AISI 301 20 cm gt 101 S a 18 28 ae 55 i 20 4 X PFEIFFER VACUUM i O Ec Ji 0 g Gana 0 i S z a PFEIFFER VACUUM 700 g Output signal measuring signal Voltage range Relationship voltage pressure Error signals Output impedance Normal load Minimum load Response time p gt 10 mbar p 10 mbar Gauge identification Grounding concept Vacuu
16. nger measurement cable lengths we recommend a differential measurement between the signal output and the signal common pin 3 as a result of the voltage drop along the supply cable ground lead the common mode signal is approx 1 0 V at the maximum permissible cable length Procedure 0 Prepare the connector Ordering number gt B 19 BG 5151 BEN 2011 01 IKR 251 1 1 PFEIFFER VACUUM 9 Solder the connection cable according to the diagram 2 10 3p 10 5 ji 5 1K HH zu i lt HH Figure 2 Power connection 3 2 1 Pin 1 identification bs Pin 2 signal output O measuring signal 1 Pin 3 signal common 2 6 Pin4 supply 5 Pin 5 supply common Pin 6 Screen Connector soldering side The supply common pin 5 and screen pin 6 must be connected to the supply unit with protective ground Incorrect connection incorrect polarity or inadmissible supply voltages can damage the gauge e Reassemble the connector 4 Plug in the connector Secure the cable on the gauge with the screw BG 5151 BEN 2011 01 IKR 251 PFEIFFER VACUUM 4 Operation As soon as the required voltage is applied the measuring signal is available between pins 2 and 3 gt Appendix A for the relationship between the measuring signal and the pressure The green lamp on the gauge 6
17. pressure measurement instrument e g a quadrupole mass spectrometer BG 5151 BEN 2011 01 23 VACUUM Austria Pfeiffer Vacuum Austria GmbH Tel 43 1 894 17 04 office pfeiffer vacuum at Sweden Pfeiffer Vacuum Scandinavia AB Tel 46 8 590 748 10 sales pfeiffer vacuum se Switzerland Pfeiffer Vacuum Schweiz AG Tel 41 44 444 22 55 info pfeiffer vacuum ch United States Pfeiffer Vacuum Inc Tel 1 603 578 6500 contact pfeiffer vacuum com www pfeiffer vacuum net Great Britain Pfeiffer Vacuum Ltd Tel 44 1908 500600 sales pfeiffer vacuum co uk India Pfeiffer Vacuum India Ltd Tel 91 40 2775 0014 pfeiffer vsnl net Italy Pfeiffer Vacuum ltalia S p A Tel 39 02 93 99 05 1 contact pfeiffer vacuum it Korea Pfeiffer Vacuum Korea Ltd Tel 82 31 266 0741 sales pfeiffer vacuum co kr A PASSION FOR PERFECTION Germany Pfeiffer Vacuum GmbH Headquarters Tel 49 0 6441 802 0 info pfeiffer vacuum de Benelux Pfeiffer Vacuum GmbH Sales amp Service Benelux Tel 800 pfeiffer benelux pfeiffer vacuum de China Pfeiffer Vacuum Shanghai Co Ltd Tel 86 21 3393 3940 info pfeiffer vacuum cn France Pfeiffer Vacuum France SAS Tel 33 169 30 92 82 info pfeiffer vacuum fr You are looking for a perfect vacuum solution Please contact us Original German BG 5151 BDE 2011 01 bg5151be
18. r ous contact voltage will occur o 9 eo e The gauge is factory calibrated and requires no maintenance It must be replaced in the event of a defect 5 B 20 17 5 1 4 Adjusting the Gauge BG 5151 BEN 2011 01 IKR 251 PFEIFFER VACUUM 5 2 Whatto Doin Case of Problem Possible cause Correction Problems Measuring signal No supply voltage Turn on the power continually gt 0 5 V and supply green lamp is OFF Measuring signal Supply voltage too low Increase the supply continually gt 0 5 V and voltage B 6 green lamp is ON Electronics unit defective Replace the electronics unit B 6 Measurement signal Vacuum chamber pressure continually in the range of gt 2x10 mbar 0 5 1 8 V underrange Gas discharge has not Wait until the gas dis ignited charge ignites 5 minutes at a pressure of 10 mbar Measuring signal unstable Gauge contaminated Clean the gauge gt B 16 6 Removing the Gauge From the Vacuum System DANGER contaminated parts Contaminated parts can be detrimental to health and environment Before you begin to work find out whether any parts are contami nated Adhere to the relevant regulations and take the necessary pre cautions when handling contaminated parts Caution vacuum component Dirt and damages impair the function of the vacuum component When handling vacuum components take appropriate measures to ensure cleanliness and pr
19. sure p 1E 00 1E 01 1E 02 1E 03 6 o 1E 04 E 9 5 c 1505 dO 5 9 o 9 c a gt 15 06 28 5 j 17 18 19 1E 10 0 0 0 5 1 0 1 5 2 0 25 3 0 3 5 4 0 4 5 5 0 5 5 60 6 5 7 0 7 5 8 0 8 5 9 0 9 5 10 0 10 5 Measuring signal U V BG 5151 BEN 2011 01 IKR 251 21 PFEIFFER VACUUM Conversion table Measuring Pressure p signal U V mbar Torr Pa gt 5 Sensor error 0 5 1 8 Underrange 1 8 2 0x10 1 5x10 2007 25 1 0x10 7 5x10 1 0x10 3 5 1 0x107 7 5x10 1 0x10 4 5 1 0x10 7 5x107 1 0x10 5 5 1 0x10 7 5x10 1 0x10 6 5 1 0x10 7 5x10 1 0x10 7 5 1 0x10 7 5x10 0 1 8 5 1 0x10 7 5x10 1 0 8 5 10 5 Overrange BG 5151 BEN 2011 01 IKR 251 PFEIFFER VACUUM B Gas Type Dependence Indicated pressure gauge calibrated for air P moan Luft Air 6 2 Xe Kr Ar N H Ne He 107 2 4 6 10 2 4 6 105 2 4 6 10 2 4 6 10 2 4 6 10 Per mbar Indication range below In the range below 10 mbar the pressure indication is linear For gases other 107 mbar than air the pressure can be determined by means of a simple conversion formula per K x indicated pressure where gas type K air N2 O2 CO 1 0 Xe 0 4 Kr 0 5 Ar 0 8 H2 24 Ne 4 1 He 5 9 These conversion factors are average values A mixture of gases and vapors is often involved In this case accurate determination is only possible with a partial
20. used Gauge failures due to contamination or wear and tear as well as expendable parts e g seals are not covered by the warranty 1 4 Liability and Warranty BG 5151 BEN 2011 01 IKR 251 PFEIFFER VACUUM 2 Technical Data 40 C 65 C 5 C 55 C 150 C without electronics unit and magnetic shielding max 80 at temperatures 31 C decreasing to 50 at 40 C indoors only altitude up to 2000 m 6600 ft 2x10 1x10 mbar t30 in the range 1x10 1x10 mbar t5 in the range 1x10 1x10 mbar Appendix B The gauge is adjusted at the factory and requires no maintenance IP 40 10 bar only for inert gases 55 C Admissible temperatures Storage Operation Bakeout Relative humidity Use Measurement range air N2 Accuracy Reproducibility Gas type dependence Adjustment Degree of protection Maximum pressure absolute Supply that conform to the requirements of a grounded protective extra low The gauge may only be connected to supply or measurement units voltage SELV The connection to the gauge has to be fused 15 0 30 0 VDC max ripple 1 Vpp gt 2 lt 1 AT Voltage at the gauge Power consumption Fuse The minimum voltage of the power supply must be increased proportionally to the 16 0 30 0 VDC max ripple 1 V5 length of the measuring cable Voltage at the supply unit with maximum cable length Hirschman
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