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Page 45

SILKOSTAT 9210

Maintenance menu

Note :

When one of the maintenance procedure is released, the analyser
automatically stops

Don’t forget to restart the instrument when maintenance
operations are realized.

Start up sub menu

MAINTENANCE

START UP

REAGENTS REFILL

EXTENDED STOP

TUBES CLEANING

PHOTOMETER TEST

PUMPS / OTHERS

SOLENOID VALVES

RELAYS

LOGICAL INPUTS

Select

Esc

This screen allows to choose the proposed maintenance help
procedure :

Start up

•

Starting

procedure.

Reagents refill

•

The procedure is applicable to each reagent refill.

Extended stop

•

Allows to condition the instrument before an extended stop.

Tubes cleaning

•

In case of reagent tubings clogging.

Photometer test : Check the photometer.

Pumps, Solenoid valves, relays, others

•

Working test of this devices.

Logical inputs

•

Logical inputs test.

START UP

Adjust flow

Sample

Esc

This screen allows to adjust the sample flows

Adjust the first sample flow with the help of the screws placed in
the front panel of the face (see figure 3.4 item. 2) to have a
perpetual overflowing in the top of the overflow vessel.

Press OK to go to the next sample.

Warning :

Do not unscrew completely the flow rate set screw. It has no
stop and may get out of its housing and provoke a sample leak.

Содержание POLYMETRON 9210

Страница 1: ...Operator Manual POLYMETRON 9210 221 192 010 Revision J 20 11 2007...

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Страница 3: ...on it is perhaps because your manual is out of date In this case please contact your Hach Ultra Analytics agent immediately to remedy the problem If the instrument is used in a way not specified by th...

Страница 4: ...d Hexavalent Chromium Cr VI Polybrom Biphenyls PBB Polybrom Diphenyls PBDE Transmitter box X CPU PCB with battery O O Power PCB O O RS 485 O Profibus O PCB CAN O PCB Local controller O PCB Measure O P...

Страница 5: ...formation that requires special emphasis Precautionary Labels Read all labels and tags attached to the instrument Personal injury or damage to this instrument could occur if not observed This symbol i...

Страница 6: ...ly components formally approved by the manufacturer should be used Any attempt at repairing the instrument in contravention of these principles could cause damage to the instrument and corporal injury...

Страница 7: ...ing the canisters 25 Using the menu 27 Language programming 28 Time and date programming 28 Starting up the analyser 29 Starting a measurement 30 5 Analyser programming 31 Analyser configuration flow...

Страница 8: ...ect 1 to 6 sub menu 58 Special prog sub menu 60 Test sub menu 60 Communication menu 61 Choice of the measure sequence menu 61 Channel activation sub menu 61 Sequence sub menu 62 Service menu 63 Time s...

Страница 9: ...A Spare parts of the 9210 SILKOSTAT A1 Appendix B Safety Precautions B1 Appendix C Table of user s configuration C1 Appendix D Pressure range change D1 Appendix E Preparation of the tubes for inserti...

Страница 10: ......

Страница 11: ...Page 5 SILKOSTAT 9210 1 Presentation of the instrument Figure 1...

Страница 12: ...tes and to intensify the colour The silicomolybdic complex is reduced to a blue molybdenum complex by means of ferrous ions A photometric measurement is carried out at the end of the reaction Figure 2...

Страница 13: ...le admission tube PE 4 6 Sample evacuation tube PE 12 17 silicone CONDITIONS OF USE Ambient temperature 5 to 45 C 41 to 113 F use inside fluctuations 10 of the power supply voltage overvoltage categor...

Страница 14: ...lay Cut off power 30 VDC 0 5 A maximum Logic inputs Number 12 Remote clearance Inhibition of samples Serial input interface RS 485 Modbus communication protocol Outputs 4 20 mA Number 8 4 20 mA 0 20 m...

Страница 15: ...calibration Time safeguard lithium battery CR 1220 3 V Caution There are risks of explosion if the replaced battery does not correspond to the correct model Do not throw away used batteries in the du...

Страница 16: ...d bus cable gland drilled 13 6 to 12mm C 5 to 7 mm cable gland Alarm signals 30V 0 5A max Logic inputs Inhibition on channels 1 to 6 acknowledgement of alarm signals Analogue outputs 0 20 mA or 4 20 m...

Страница 17: ...25VA Field bus cable gland drilled13 6 to 12mm Alarm signals 30V 0 5A max Logic inputs Inhibition on channels 1 to 6 acknowledgement of alarm signals Analogue outputs 0 20mA or 4 20mA B Samples inlets...

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Страница 19: ...of complaints For any missing parts or accessories please contact your distributor Pre installation Before installing the analyser think about the following precautions Place the analyser close to a s...

Страница 20: ...t panel Figure 6 Analyser rear panel 1 Monec transmitter box 2 Sample level detector 3 Overflow vessel 4 Sample 1 to 6 flow adjustment valves 5 Photometric measurement cell 6 Local controller box 7 Me...

Страница 21: ...itioning the canisters A canister holder is supplied with the analyser it is fixed as shown in the figure below Figure 7 Canister replacing In all cases respect the maximum height between the measurem...

Страница 22: ...the quick release connections found under the sampling block Figure 8 Direct sample connections 1 3 2 Connecting the evacuation drain tube The connection of the pipe is located on the bottom of the a...

Страница 23: ...The instrument should be connected to the mains via a circuit breaker or fuse whose value should be less or equal to 20 A It should be located in proximity and be identified This connection should cu...

Страница 24: ...rew the 4 screws from the front panel Rotate the front panel Remove the shielding plate Run the cable through the transmitter gland Remove the terminals and screw up the wires Figure 10 Position of ma...

Страница 25: ...d plate of the 9210 RS485 connections optional extra Unscrew the 4 fixing screws from the front panel and turn it round Run the cable through the transmitter gland connect RX TX and RX TX connector is...

Страница 26: ...ameter of cables should be between 5 and 7 mm Figure 12 Local controller connections 1 FIX2 Vcc TDO TCK TMS TDI GND Rel 12 Rel 11 Vout 1 Vout 2 Vout 3 Vout 4 Vout 5 Vout 6 Vout 7 Vout 8 Vout 9 Vout 10...

Страница 27: ...erminals in and Terminals and out are not used 5 Vdc 5 mA In7 to In10 Input not used in this application In11 Remote acknoledgment of alarms In12 Level sample detector Iout1 to Iout6 Analog output 0 2...

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Страница 29: ...molybdate Na2MoO4 2H2O 99 neat analytical quality FLUKA 71756 MERCK 106521 or equivalent 100 g Concentrated sulphuric acid H2SO4 95 97 neat analytical quality FLUKA 84721 MERCK 100731 or equivalent 9...

Страница 30: ...analytical quality FLUKA 09720 MERCK 103792 or equivalent 40 g 1 Fill a 2 litre graduated flask to 2 3rds capacity with demineralised water with the lowest possible silica content Add the concentrate...

Страница 31: ...re tagged as 1 to 3 They come with an analyser and are fed through the special stoppers on the reagent canisters One end of these pipes is fitted with a chemically inert PVC strainer that is used to p...

Страница 32: ...nister stand must be under the analyser panel In the cabinet version it is in the back part of the cabinet Note The canisters must not be placed more than 40 cm from the lower part of the down of the...

Страница 33: ...the calibration and maintenance mode An access code may be required for the calibration programming and service menu see CODE menu c Name of last measured sample here sample 1 d Current time XX XX e C...

Страница 34: ...es customize Use the key to change the selected digit and press the Enter key to validate the modification and select the next digit Languages available are French F English GB German D Spanish Sp Ita...

Страница 35: ...immersion OK Esc Pumps priming Imerge the different reagent tubings in the canisters Press OK when pipes of the different pumps are full of reagent Go back to maintenance menu MAINTENANCE DEMARRAGE R...

Страница 36: ...210 Starting a measurement Sample 1 14 00 10 00 ppb CAL Sample 5 P 02 02 02 Sampling 14 30 00 Z 03 02 02 14 30 00 DISP2 START MENU Esc With the help of the Esc function key go back to the main screen...

Страница 37: ...IC PROGRAMMING READ PROGRAMMING FROM xx xx xx AT xx xx xx CH A11 ALARMS yes ALARMS ALARMS ALARM 1 ALARM 2 ALARM 3 ALARM 4 ALARM 5 ALARM 6 WARNING ALARM SYSTEM ALARM ALARM X MOD limit AFFECT Channel 1...

Страница 38: ...00 DISP2 START MENU Esc c e d f g 10 j i k h c Name of last measured sample here sample 1 d Current time XX XX e Concentration of last measured sample f Unit concentration g Sample is being analysed S...

Страница 39: ...mple 1 XXX XX XX XX Sample 6 XXX XX XX XX Extern DISP3 Esc Last measures with next indications c d e f c Sample name d The last concentration value of the sample e Time when last measurement was perfo...

Страница 40: ...stem Measure error Measurement error Warning Reference error LED light ajustment problem Warning Extinction error Black current problem Warning Meas time over Maximum cycle time for the measure has be...

Страница 41: ...ity to display the sign On the others digits possibility to display the sign Note If you do not use the keyboard for at least 10 minutes the instrument returns to the measuring mode except for the cal...

Страница 42: ...S NO Esc Sample 1 14 00 10 00 ppb CAL ANALYSER P 02 02 02 STOPPED 14 30 00 Z 03 02 02 14 30 00 DISP2 STOP MENU Esc You have 2 possibilities to access to the programming menu Access to the menus which...

Страница 43: ...ree of SiO2 the SILKOSTAT carries out a measurement without a colorimetric reaction The slope of the system is calibrated with a known concentration of SiO2 standard solution Three types of calibratio...

Страница 44: ...tion which will be signified by an error message This calibration can be realized only in the manual way Access to the main MENU Choose CALIBRATION menu with the select function key and validate by pr...

Страница 45: ...ING EXECUTION PRIMARY CAL PARAMETERS HISTORIC Select Esc Choice of the calibration Access to the menu Press MENU key Choose CALIBRATION menu with the select function key and validate by pressing Enter...

Страница 46: ...OGRAMMING sub menu and validate by pressing Enter PROGRAMMING OFFSET INTERVAL 200 h CAL SOL 010 0 ppb AUTO CAL Non Select Esc This screen allows to program the zero calibration frequency the calibrati...

Страница 47: ...K menu allows to choose the calibration day s Ex SMTWTFS daily calibration SM W FS calibration every day except Tuesday and Thursday HOUR menu allows to adjust the hour to start calibration PROGRAMMIN...

Страница 48: ...01 Esc This screen allows to visualize the primary calibration parameters and the last calibration parameters Calibration historic sub menu HISTORIC 31 08 00 auto 09 18 01 O 5 19 28 51 O 5 02 09 00 ma...

Страница 49: ...0 50 XXX Primary calibration S XXX XX XX XX O XXX XX XX XX Last calibration S XXX XX XX XX O XXX XX XX XX C XXX XX XX XX Actual calibration S XXX O XXX Calibration OK OK Esc Zone ok Normal variations...

Страница 50: ...XX O XXX XX XX XX Last calibration S XXX XX XX XX O XXX XX XX XX C XXX XX XX XX Actual calibration S XXX O XXX Calibration error Cancel Remake Esc Rejection zone Parameters are abnormal There is mate...

Страница 51: ...o each reagent refill Extended stop Allows to condition the instrument before an extended stop Tubes cleaning In case of reagent tubings clogging Photometer test Check the photometer Pumps Solenoid va...

Страница 52: ...agents in the tubes Esc allows to return to the previous screen or to stop the procedure CANISTERS FULL choose this option each time than canisters are full The volumes of the 4 canisters are automati...

Страница 53: ...tubes priming you can quit the procedure by pressing ESC After the pump operation check visually the tubings are full If it is not the case return to the menu pump EXTENDED STOP Put tubes in deminera...

Страница 54: ...ml of demineralised water and a second beaker containing 100ml of ammonia at 10 of normal commercial concentrations by volume ie approximately 3 v v Immerse tubing R1 in the ammoniac solution Press OK...

Страница 55: ...ignal Absorbance Absorbance in milli Abs Function key Bck allows to begin the measure which corresponds to the switching off of the LED Ref allows to adjust the led current and to measure the referenc...

Страница 56: ...oid valves sample transfer from overflow tank to measuring cell MAINTENANCE Relay 01 OFF Relay 02 OFF Relay 03 OFF Relay 04 OFF Relay 05 OFF Relay 06 OFF Relay 07 OFF Relay 08 OFF Relay 09 OFF Relay 1...

Страница 57: ...measure historic allows to visualize the data during 5 days PROGRAMMING MODE Normal CYCLE In loop INTERVAL XXX mn Select Esc OR This screen allows to program the measuring mode If the interval cycle i...

Страница 58: ...he analyser complains the sample to analyse Remove the level probe of the overflow vessel figure 3 1 item 2 refill with the sample in 3 or 4 times Replace the level probe Press Ok to operate the measu...

Страница 59: ...103 Select Esc READ allows to read the historic Use the scroll up key to choose the data format Date day month year Hour sample n n and concentration or default ADC VALUES PRIMARY CALIBRATION ref mea...

Страница 60: ...gn the alarm 1 to 6 to the measure channel of our choice LIMIT XXXX Allows to adjust the limit value ppb DIRECTION Up Down Allows to adjust the relay direction interlocking HYSTERESIS XX Allows to adj...

Страница 61: ...Relay activating direction towards up when C 100 ppb No hysteresis 00 Relay type N O normally open ALARM X MODE active channel RELAY NO Select Esc OR If MODE Active channel The alarm N X is activated...

Страница 62: ...Value Description ALARM Yes No Warning alarm in operating or not Manual Press enter to accept the alarm manual ACCEPT Auto Automatic accept of the alarm disappear when the alarm disappear RELAY N O N...

Страница 63: ...eference error Curent del adaptation problem Warning Extinction error Extinction del problem Warning Meas time over Cycle time of the measure is very long Warning Cal time over Cycle time of the calib...

Страница 64: ...ue outputs parameters AFFECT OUTPUT 1 OUTPUT 2 OUTPUT 3 OUTPUT 4 OUTPUT 5 OUTPUT 6 Select Esc This screen allows to select an output and to display its parameters AFFECT Allows to assign the output 1...

Страница 65: ...0 0 ppb END 000 0 ppm Select Esc This screen displays the parameters of each 6 output If the dual mode is chosen you must program the concentration value corresponding to the middle of the scale Conce...

Страница 66: ...an be programmed Storage The output n 7 is not modified SPECIAL PROG MODE Preset VALUE XXX mA Select Esc Preset The analogue output n 7 is set to the programmed value in the VALUE parameter between 0...

Страница 67: ...it SEQUENCE CHANNEL ACTIVATION SEQUENCE Select Esc The SEQUENCE menu allows to run or stop the different measurement channels and to set up the analysis samples order CHANNEL ACTIVATION CHANNEL 1 On C...

Страница 68: ...he channel as the channel number as possible The Delete key replaces the digit by the symbol This symbol indicates the inhibition of the step in the sequence Press Enter to validate and go to the next...

Страница 69: ...E JJMM AA 09 05 01 TIME 14 43 16 Select Esc This screen allows to change the date and the time of the instrument DISPLAY LANGUAGE F CONCENTRATION ppb ppm CUSTOMIZE Select Esc This screen allows to cha...

Страница 70: ...case letters A Z numbers 0 9 and punctuation signs Service Code sub menu Soft issues sub menu CODE PROGRAMMATION 0000 CALIBRATION 0000 SERVICE 0000 Select Esc Use this screen to enter the analyser s...

Страница 71: ...nt values and the historic alarms ADJUST mA OUTPUT 1 OUTPUT 2 OUTPUT 3 OUTPUT 4 OUTPUT 5 OUTPUT 6 OUTPUT 7 OUTPUT 8 Select Esc Select the output with the Select key and validate by the Enter key to di...

Страница 72: ...nd 6 the operating and waiting time of the sample valves pumps and measurement parameters SOLENOID VALVES Ton SAMPLE XXX Toff SAMPLE XXXs SOL CAL Ton XXX SOL CAL Toff XXXs Esc Adjustment of the openin...

Страница 73: ...his screen allows to change the frequencies MAINS FREG 50 Hz or 60 Hz it depends on the country frequency REFERENCE FREQ Current frequency adjustment of the LED level reading BLACK FREQ Current freque...

Страница 74: ......

Страница 75: ...al Calibration solution canister volume 150ml It is necessary to program the new canister volume at each refill for a good detection of the short reagent Stop the instrument STOP Refill the reagent ca...

Страница 76: ...ANISTERS menu put these volumes at 2 litres The analyser controls the calibration solution and reagent consumption and emits system alarm as the level of the canisters is going too low Warning Alarm s...

Страница 77: ...sing operation Stop the instrument by pressing STOP Press the MENU key EXTENDED STOP Put tubes in demineralised water Accept with OK OK Esc Choose the MAINTENANCE menu Choose the sub menu EXTENDED STO...

Страница 78: ...Set the flow rate for the first sample using the adjusting screws on the front panel see Figure 3 3 serial 4 in such a way that a constant overflow takes place over the top of the overflow vessel STA...

Страница 79: ...step The procedure is the following Rinse the tube with demineralised water Clean with a 10 ammonia solution Rinse again the tube with demineralised water During these stages In special cases you mus...

Страница 80: ......

Страница 81: ...oesn t normally run Problem Possible cause Problem N The system doesn t run Start Stop Datalyt 1 The measure is not stable too high or too low Cal Tubes Photometer Valves Pump 5 3 8 4 2 Wrong calibrat...

Страница 82: ...verify than their flow is about 1 5ml mn 30 pulses Change the pump 2 PUMP Irregular The analyser may have been stopped without tubes cleaning Send water in the pump during its work Change the pump Def...

Страница 83: ...ubes connected in a wrong order Verify the flow diagram Wrong concentration Prepare a new reagents batch Wrong chemical products or old or contaminated Wrong purity New supplier 7 REAGENTS Wrong reage...

Страница 84: ...bient temperature The real values may deviate from more than one volt without having an effect on the measurements Version 0 1000 ppb Sample concentration Reference mV Measure mV 107 ppb 3500 2515 214...

Страница 85: ...ogrammed for SILKOSTAT 09200 A 1010 CPU board with display for Monec E9200 programmed for PHOSPHAMAT 09200 A 1011 Power supply board for Monec E9200 09200 A 2000 RS485 board MODBUS Manual 09125 A 0485...

Страница 86: ...p PA black 425 210 022 Spacer ring for 921X mirror 09210 C 0330 O ring Viton 22x1 mm 356099 05220 Square cover for 921 X photometric cell 09210 C 0310 Spare parts Reagents and calibration Chemical kit...

Страница 87: ...tal dose LD50 275 mg Kg SAFETY PRECAUTIONS EYES Irrigate thoroughly with water obtain medical attention LUNGS Remove exposure rest and keep arm obtain medical attention INGESTION Wash out thoroughly w...

Страница 88: ...es SPILLAGE HANDLING SMALL SPILLAGE Mop up with plenty of water and run to waste diluting greatly with running water LARGE SPILLAGE Transfer to salvage canister and treat residue as for small spillage...

Страница 89: ...ernal irritation and damage Dilute acid irritates the eyes and skin and can cause burns and dermatitis Minimum lethal dose D50 2140 mg Kg par voie orale Occupational exposure standard long term exposu...

Страница 90: ...sh If local regulations permit cautiously add plenty of water and mop up while diluting with more water and run to waste Wash site of spillage thoroughly with water Otherwise cover with dry lime sand...

Страница 91: ...of reach of children Toxic by ingestion and skin contact Toxic by inhalation Irritating to skin and eyes may cause damage if exposure is prolonged Occupational exposure standard long term exposure lim...

Страница 92: ...lages liquids should be contained with sand or earth and both liquids and solids transferred to salvage canisters Any residues should be treated as for small spillages If material has entered surface...

Страница 93: ...ODOUR Nil MELTING POINT 100 C DENSITY 1 86 g cm FIRE AND EXPLOSION HAZARD Non combustible Likelihood of dangerous vapours being given off if close to a fire In fire situations it may form nitrogen ox...

Страница 94: ...oduct DISPOSAL MEASURES Contact a specialist waste disposal organisation where disposal of this product is required Dissolve or mix the product with a combustible solvent and burn in a chemical incine...

Страница 95: ...e foam SPECIAL RISKS Specific Danger s Gives off toxic fumes if burnt SPECIAL PROTECTIVE EQUIPMENT NEEDED FOR FIRE FIGHTING Wear individual breathing apparatus and protective clothing to prevent any c...

Страница 96: ...lenty of water If feeling unwell seek medical aid CHEMICAL DANGER AND STABILITY STABILITY Stable SPECIFIC RISKS No information available DISPOSAL Observe all federal state and local environmental regu...

Страница 97: ...Sodium molybdate Sulphuric acid 90 5 5 C R35 S26 30 45 IDENTIFICATION OF HAZARDS Product not considered as dangerous according to the 67 548 CEE directive FIRST AID SKIN CONTACT Rinse affected area wi...

Страница 98: ...steam aerosol HAND PROTECTION Wear latex gloves EYE PROTECTION Safety glasses are recommended OTHER PROTECTION Acid proof clothing HYGIENE MEASURES Wash hands after contact PHYSICAL AND CHEMICAL PROPE...

Страница 99: ...isposal companies that will inform you of the disposal measures to take PACKAGING Disposal in accordance with prevailing legislation Contaminated containers must be processed in the same manner as the...

Страница 100: ...NENTS CAS NUMBER SOLUTION QUANTITY CLASSIFICATION 213 653 7 6153 56 6 Water Oxalic acid 95 5 Xn R21 22 IDENTIFICATION OF HAZARDS Injurious on contact with skin or by ingestion FIRST AID SKIN CONTACT R...

Страница 101: ...N Required if steam aerosol HAND PROTECTION Wear nitrile gloves EYE PROTECTION Safety glasses are required HYGIENE MEASURES Wash hands after contact PHYSICAL AND CHEMICAL PROPERTIES FORM Liquid COLOR...

Страница 102: ...h EEC member state We advise you to contact the competent authorities administration or specialist waste disposal companies that will inform you of the disposal measures to take PACKAGING Disposal in...

Страница 103: ...um iron III sulphates Sulphuric acid 96 2 2 C R35 S26 30 45 IDENTIFICATION OF HAZARDS Product not considered as dangerous according to the 67 548 CEE directive FIRST AID SKIN CONTACT Rinse affected ar...

Страница 104: ...team aerosol HAND PROTECTION Wear nitrile gloves EYE PROTECTION Safety glasses are required OTHER PROTECTION Acid proof clothing HYGIENE MEASURES Wash hands after contact PHYSICAL AND CHEMICAL PROPERT...

Страница 105: ...disposal companies that will inform you of the disposal measures to take PACKAGING Disposal in accordance with prevailing legislation Contaminated containers must be processed in the same manner as th...

Страница 106: ...e battery Crush puncture open or dismantle the battery Store or operate equipment above the temperature specified Short circuit the battery Dispose of the battery in a fire Try to repair faults on the...

Страница 107: ...nt volume 2 00 l Xx MEASURE MEASURE MODE Cycle Interval interval in loops Interval 15 mn xx hour minute ALARMS ALARM 1 Mode Limit limit active channel level sample Affect Channel 1 Conc Limit 1000 ppb...

Страница 108: ...RM Alarm Yes yes no Accept Manual Manual automatic Relay N O N O N C ALARMS SYSTEM ALARM Alarm Yes Oui non Accept Manuel Manual automatic Relay N C N O N C mA OUTPUTS AFFECT OUTPUT 1 Affect Channel 1...

Страница 109: ...Mode Linear Linear dual Low 0 ppb XXX Middle 100 ppb XXX Up 1 ppm XXX mA OUTPUTS SPECIAL PROG MAINTENANCE Mode Last Last preset live Value if preset mode selected 0 mA Xx mA OUTPUTS SPECIAL PROG CALIB...

Страница 110: ...and 0 9 SERVICE CONFIGURATION Mains freq 60 Hz 50 60 Hz Reference freq 0 Xx Freq noir 9999 Xx SERVICE FACTORY Channel number X 1 to 6 SERVICE FACTORY SOLENOID VALVES Sample N Open time adjust 3 xx To...

Страница 111: ...o 6 bars it is required to change the solenoid valves collar see figure 1 item 6 So a High pressure kit contains 6 collars 0 8 diameter and a TORX key Figure 1 Mounting of the solenoid valves 1 Hold d...

Страница 112: ...6 of the body 4 Change the 2 O rings 7 of the collar 6 Replace the joints to the new collar Put the collar in position on the steel block 8 in the good direction Place the undeceiver 10 in the indica...

Страница 113: ...the slot to realise see the table below Tube length 6 mm 1 4 5 16 L 7 3 0 5 0 33 0 02 0 36 0 02 Figure 2 Fasten the knurl Place the tube in the tube cutter and set the knurl on the mark Fasten the kn...

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