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SKF CMSS 785 Series, User Manual

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SKF CMSS 785 Series User Manual Download Page 52

User manual No.  
15V-090-00062-100 
Published in August 2020
Revision C

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©  SKF Group 2020
The contents of this publication are the copyright of the publisher and may not be reproduced (even 
extracts) unless prior written permission is granted. Every care has been taken to ensure the accuracy 
of the information contained in this publication but no liability can be accepted for any loss or damage 
whether direct, indirect or consequential arising out of the use of the information contained herein.

PUB CM/I4 17533/1 EN

  ·  August 2020

Summary of Contents for CMSS 785 Series

Page 1: ...User manual Eddy Current Probe Systems CMSS 785 Series API 670 Proximity transducers 5 and 8 mm...

Page 2: ...ut also in respect of other instrumentation and equipment connected to this unit For safety it is necessary to be familiar with safe working practices and proce dures appropriate to the installation s...

Page 3: ...life 31 6 3Troubleshooting 32 7 Information about intrinsically safe applications 33 7 1 CSA Installation 33 7 1 1 System drawing 33 7 1 1 System drawing cont 34 7 1 2 Label information 34 7 2 ATEX In...

Page 4: ...4 4...

Page 5: ...se cautions and to follow the guidance provided WARNING This symbol is used to warn of the possibility of injury Always follow the instructions to ensure safety CAUTION This symbol is used to draw att...

Page 6: ...other than those with insulation resistance and voltage endurance specifications indicated Doing otherwise may damage the unit If performing a megger test insulation test of the signal trans mission c...

Page 7: ...circa 1 MHz that radiates from a coil encapsulated in the probe tip As a conductive surface approaches the coil eddy currents are generated on the target and this in turn causes a detectable decrease...

Page 8: ...e system Only the component combinations shown in the graphic below are allowed CMSS 75 or CMSS 78 probe CMSS 985 extension cable System cable length CMSS 785 driver A B C 0 5 m 4 5 m 5 m CMSS 785 11...

Page 9: ...cal length of probes and cables may be longer than but not shorter than the nominal length 3 1 1 Probes 5 mm C M S S 7 5 CMSS 75 5 mm probe Armor L Without armor A With armor without fluoro resin coat...

Page 10: ...7 Connector Sensor tip Lock nut Threaded area CMSS 75 L standard probe without armour Example CMSS 75 AU1 02 10 05 5 mm armour thread size UNF 1 4 28 unthreaded length L1 0 2 in case length L2 1 0 in...

Page 11: ...hreaded length if M2 10 mm increments 0 230 mm L1 L2 20 mm e g 06 60 mm Unthreaded length if U2 0 1 inch increments 0 9 2 in L1 L2 0 7 inches e g 04 0 4 inches Case length if M2 10 mm increments 20 25...

Page 12: ...k nut Threaded area CMSS 78 L standard probe without armour Example CMSS 78 AM2 04 20 90 8 mm diameter probe armoured M10x1 thread unthreaded case length L1 40 mm case length L2 200 mm pigtail cable l...

Page 13: ...1 L2 L3 Example CMSS 78 RM2 05 03 05 8 mm probe reverse mount thread size M10x1 unthreaded length L1 5 mm case length L2 30 mm 03 30 mm cable length L3 0 5 m CMSS 78 RU2 02 12 90 8 mm probe reverse mo...

Page 14: ...0 28 8 6 0 34 CMSS 985 L extension cable without armour CMSS 985 A extension cable with armour Connector Cable Connector Connector Cable Flexible armour Connector Extension cables Example CMSS 985 L 4...

Page 15: ...mm mount 2 Screw mount multi pitch 50 8 50 8 mm and 92 31 mm CMSS 785 11 CMSS 785 21 Unit mm 29 1 14 35 1 4 32 1 26 40 1 57 72 2 8 6 0 24 68 2 7 Terminal block Sensor input connector Mounting plate C...

Page 16: ...ay operation can adversely affect the unit We recommend using separate wiring ducts Allow sufficient space in housings etc to respect the minimum allowed bend radius of the probe and extension cables...

Page 17: ...ix B the effect that the precise nature of the target operating environment etc can have on the system output characteristic is quantified by way of examples B1 through B9 Further guidance on the inst...

Page 18: ...If they are placed too close together the probes will interfere with each other 20 mm or more 30 mm or more 40 mm or more Target Target For the preferred detailing of the probe mounting refer to the i...

Page 19: ...t plate around the sensor tip is chamfered it will be affected by the attachment plate If the target and the sensor tip are not parallel dimen sion X1 and X2 are not the same it will affect the readin...

Page 20: ...S1 JEIDA Japanese Electronic Industry DevelopmentAssociation JEIDA 29 1979 CLASS S1 Hydrogen sulfide 0 01 ppm or less NOx gas 0 05 ppm or less Ambient temperature 25 C 5 C humidity 40 to 80 RH Instal...

Page 21: ...to allow sufficient space between the driver and the enclosure walls for the probe cable connection to the driver and also allow an appropriate spacing between drivers for the monitor cabling 60 mm O...

Page 22: ...be suitable for both the driver and the monitor terminals typical availability 0 5 0 75 or 1 0 mm2 nom inal cross sectional area The conductor should be twisted sev en strand or greater CAUTION The d...

Page 23: ...ove beyond the linear range of the measurement system When using a gap feeler gage insert between the senor tip and target to measure the gap Adjust the probe to a position where the gage just moves f...

Page 24: ...age and or electrical Section 5 4 methods to verify the probe to target gap 5 1 1 When using the CMSS VZ 03A bracket 1 Attach the CMSS VZ 03A bracket to the mount body machine and temporarily attach w...

Page 25: ...0A sensor sleeve 3 Attach the CMSS VZ 10A sensor sleeve to the mounting machine casing 4 Adjust the gap between the probe and the target 5 Lock the sleeve in position 6 Verify the final probe to targe...

Page 26: ...Cutting either the probe or the extension cable to a shorter length will result in a measurement system that no longer conforms with the specification Never use vinyl tape to insulate During extended...

Page 27: ...lly only tighten the connector by hand If it is tightened using a tool there is a risk that the connector may be damaged Cutting either the probe or the extension cable to a shorter length will result...

Page 28: ...n section 4 1 4 for further details 5 2 2 Installation of DIN rail mount drivers The CMSS 785 rail mount versions are designed to be mounted on a 35 mm DIN rail Install according to the following step...

Page 29: ...e recommend using cables of the type described in 4 3 Connections to the Monitoring System between the unit and monitor As a small signal is being transmitted inferior cables may be subject to interfe...

Page 30: ...terminals 2 3 Use a DVM to confirm the DC voltage measured at the driver s output terminals 3 If the probe is to be gapped adjusted 3 1 Loosen the jam nut of the probe 3 2 Adjust the probe position so...

Page 31: ...cement desirable In the flowchart below a system calibration check output voltage against static gap at incremental positions across the working range provides the base line data on which to judge the...

Page 32: ...age If appropriate repeat the measurement at the probe connector and replace the probe extension cable as found necessary see also next test The extension cable is shorted or disconnected With the ext...

Page 33: ...tus unspecified except that it must not be supplied from nor contain under normal or abnormal conditions A source of potential with respect to earth in excess of 250 V RMS or 250 V DC WARNING SUBSTITU...

Page 34: ...7 1 1 System drawing cont 7 1 2 Label information The label is applied to the driver module case 34 34...

Page 35: ...7 2 ATEX Installation 7 2 1 System drawing 7 2 2 Applicable standards ATEX EN 60079 0 2012 A11 2013 EN 60079 11 2012 35 35...

Page 36: ...7 2 3 Label information XXX represents the year of manufacture eg 2015 is written in the part of if the production is manufactured in 2015 The label is applied to the driver module case 36 36...

Page 37: ...ion cables Sensor tip diameter Approximately 5 mm and 8 mm System cable length 5 or 9 m Maximum cable tension 98 1 N 10 kgf Minimum bend radius 30 mm without armoured cable 50 mm with armoured cable J...

Page 38: ...A1 Frequency response graph 2 0 0 0 2 0 4 0 6 0 8 0 10 0 10 100 1 000 10 000 100 000 Magnitude dB Frequency Hz 3 15 Vp p 400 m p p 10 Vp p 38 38...

Page 39: ...er supply and target condition influences B1 Standard static characteristic Target material SCM440 flat face dia 15 mm or more Nominal Scale Factor SCF is 7 87 mV m 200 mV mil 24 20 16 12 8 4 0 0 0 0...

Page 40: ...characteristics 5 m system 24 20 16 12 8 4 0 0 0 0 5 1 0 1 5 2 0 2 5 Output V Gap mm 10 5 0 5 10 0 0 0 5 1 0 1 5 2 0 2 5 SCF error Gap mm LIN of F S 4 2 0 2 4 0 0 0 5 1 0 1 5 2 0 2 5 Gap mm 35 C 0 C...

Page 41: ...0 0 5 1 0 1 5 2 0 2 5 Output V Gap mm 10 5 0 5 10 0 0 0 5 1 0 1 5 2 0 2 5 SCF error Gap mm LIN of F S 4 2 0 2 4 0 0 0 5 1 0 1 5 2 0 2 5 Gap mm 35 C 0 C 25 C 45 C 65 C B3 Driver temperature characteris...

Page 42: ...B4 Effect due to driver supply voltage variation 24 22 20 18 16 14 12 10 8 6 4 2 0 0 0 0 5 1 0 1 5 2 0 2 5 Output V Gap mm 18 V 20 V 22 V 24 V 26 V 42 42...

Page 43: ...B5 Response to different target materials 24 22 20 18 16 14 12 10 8 6 4 2 0 0 0 0 5 1 0 1 5 2 0 2 5 Output V Gap mm SCM440 SNCM439 S45C SUS304 Probe Target Gap 43 43...

Page 44: ...B6 Effect due to target diameter Target material SCM440 24 22 20 18 16 14 12 10 8 6 4 2 0 0 0 0 5 1 0 1 5 2 0 2 5 Output V Gap mm D D 20 mm D 15 mm D 10 mm Probe Target D 44 44...

Page 45: ...B7 Effect of a curved target surface Target material SCM440 24 22 20 18 16 14 12 10 8 6 4 2 0 0 0 0 5 1 0 1 5 2 0 2 5 Output V Gap mm D D 20 mm D 15 mm D 10 mm Probe Target D 45 45...

Page 46: ...B8 Effect due to abrupt target edge Target material SCM440 24 22 20 18 16 14 12 10 8 6 4 2 0 0 0 0 5 1 0 1 5 2 0 2 5 Output V Gap mm X X 9 mm X 7 5 mm X 5 mm X 0 mm Probe Target X 46 46...

Page 47: ...16 14 12 10 8 6 4 2 0 0 0 0 5 1 0 1 5 2 0 2 5 Output V Gap mm X X 12 mm X 9 mm X 7 5 mm X 5 mm Probe Target Side wall X Gap B9 Effect due to the proximity of a side wall Target and side wall material...

Page 48: ...ble racks Good example Transmission cable 3 wire shielded cable Power line or control line Conduit pipe Power line Signal line Conduit pipe Conduit pipe Signal transmission cable 3 wire shielded cable...

Page 49: ...49 49...

Page 50: ...to the sensing device the interconnect cabling junction boxes if any and the communications inter face must consist only of SKF supplied or SKF approved devices and or components The computer provide...

Page 51: ...lteration or main tenance neglect excessive operating condi tions or for defects caused by or attributable to the Buyer including without limitation Buyer s failure to comply with any written instruct...

Page 52: ...opyright of the publisher and may not be reproduced even extracts unless prior written permission is granted Every care has been taken to ensure the accuracy of the information contained in this publi...

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