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Maintenance

Page 24 of 72 Pages

9023927 - 2nd edition - May 2007

Sensor diagnostic function

This function is active only if the Polytron 7500 is equipped with a sensor diagnostic
dongle (Order No. 83 17 860).
— Extended sensor self-test function, taking such things as the temperature, gas

monitoring and remaining sensitivity into account.

— During normal operation, the sensor status is indicated by the sensor-diagnostic

icon in the display:

The sensor is ready

The sensor is ready for use but nearing the end of its operating lifetime

The sensor is still ready for use but should be replaced as soon as possible

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Содержание Polytron 7500

Страница 1: ...9023927 2nd edition May 2007 Page 1 of 72 Pages D Dräger Polytron 7500 Instructions for Use ST 3804 2005_sw eps ...

Страница 2: ...nalogue signal 17 Display 17 Displays of control LEDs 18 Activating info mode 19 Maintenance 21 Maintenance intervals 21 Calibrating the unit 22 Setting up the unit 22 Replacing the sensor 23 Replacing the pump 25 Replacing the pyrolysis oven 26 Replacing the internal dust filter 27 Fault Cause Remedy 28 Menu functions 31 Menu structure 31 Basic operating procedures 33 Switching to quick menu mode...

Страница 3: ...n cal 40 Autocalibration 41 The menu Settings 43 Overview 43 Sub menu Instrument 44 Sub menu Communication 51 Sub menu Sensor 56 Sub menu Datalogger 59 Polytron 7500 Operation via LON 62 Technical Data 63 Order List 64 Accessories 64 Calibration accessories 64 Spare parts 64 Index 65 Drilling templates 69 Pyrolyzer Docking Station 69 ...

Страница 4: ...nance Observe chapter Maintenance intervals Do not operate in explosion hazard areas The Polytron 7500 is not suitable for use in explosion hazard areas Accessories Do not use accessory parts other than those listed in the order list Liability for proper function or damage The liability for the proper function of the Polytron 7500 is irrevocably transferred to the owner or operator to the extent t...

Страница 5: ... 125 Dräger Polytron 7500 PFC 0 to 30 ppm C5F8 CAS 559 40 0 0 to 30 ppm C4F6 CAS 685 63 2 83 18 828 68 11 120 Dräger Polytron 7500 NF3 LON 0 to 50 ppm NF3 CAS 7783 54 2 83 18 829 68 11 125 Dräger Polytron 7500 PFC LON 0 to 30 ppm C5F8 CAS 559 40 0 0 to 30 ppm C4F6 CAS 685 63 2 83 18 830 68 11 120 Note Polytron 7500 cannot be used with DrägerSensors other than the above listed The corresponding Drä...

Страница 6: ... additional ventila tion Indication of unit faults display of maintenance measures required Special calibration mode blocking of alarm triggering display of calibration mode one man calibration Optional extras Polytron 7500 relay module This module permits the local switching of actuators alarm generators etc on the basis of the measured gas concentration Dräger Polytron 7500 software dongles For ...

Страница 7: ...e specific uses e g possible leaks All other factors and conditions which could have a negative effect on the instal lation and operation of the system Physical properties of the gas to be measured For gases with a density lower than that of air the gas intake must be located above any possible leak or at the highest point at which large concentrations of gas may occur For gases and vapours with a...

Страница 8: ... see page 69 Electrical connections Connect the docking station to the central unit with a cable with at least three wires conductor cross section 0 5 to 2 5 mm2 Line lengths see Maximum line lengths on page 9 For currents of 3 and 22 mA a DC voltage between 16 5 V DC 3 mA or 8 0 V DC 22 mA must be present at the unit between the terminals 24 V and 4 20 3 wire connection Installing the 4 to 20 mA ...

Страница 9: ...mA Lmax Rline x A 0 0175 Ohm x mm2 m Example The following is valid with a permitted error current IF of 3 15 mA In a given situation the cable length Lmax can be increased by a series connection of a resistor RM into the cable for the 4 to 20 mA signal Rschunt new Rshunt old RM Following limitations have to be fulﬁlled Rline Rshunt between 30 Ohm and 500 Ohm For currents of 3 and 22 mA a DC volta...

Страница 10: ...rrect Each unit must first be put into service separately Use the menu item Polling Address to assign a different polling address in the range 1 to 15 to each Polytron 7500 which is to be connected to the multidrop cable It is best to assign sequential polling addresses starting with 1 Depending on the supply unit up to 8 Polytron 7500s can be connected to a line Multidrop installation with HART c...

Страница 11: ...ection cable in the cable gland cut to length and strip ends about 80 mm Shorten the shield if installed to prevent short circuiting Connecting the cable secure in terminals of 4 pin connecting terminal block ensure correct polarity 1 Slide the connecting terminal block back into holder until the lock clicks into place 00523927_1 eps 24V 0V LON B LON A 1 ...

Страница 12: ...r the installed Polytron 7500 until it snaps into place at the sides Connecting the hoses Insert the hose into the quick release fastener below the unit 4 Gas input from the inlet point right connection marked with O ring 5 Gas output to the offtake left connection Check the hoses to make sure they are inserted properly Attention The electrical connection via the edge connector must be clean i e t...

Страница 13: ...n the cable gland cut to length and strip ends approx 80 mm Shorten the shield if installed to prevent short circuiting Connecting the cable 3 potential free relay outputs with 250 V 5 A AC switching capability are available 1 Fault relay switches in the case of a device fault 2 A2 relay switches when the A2 gas alarm is active 3 A1 relay switches when the A1 gas alarm is active Connect the device...

Страница 14: ...inal in the measuring unit 8 Fix cable with cable tie to the bracket 9 Push relay housing from below into the docking station until it snaps into place Insert the Polytron 7500 back into the docking station Carry out function test Polytron 7500 operates in the measurement mode normal operation 10 The LED on the side of the relay module lights green Hold the hose briefly until a flow fault is displ...

Страница 15: ...he don gle into any of the three slots Up to three dongles may be installed simultaneously Insert the Polytron 7500 back into the docking station Place the cover back on Data Dongle 83 17 618 Colour code blue Activates the Event Logger the Datalogger and the graphical concentration display Sensor Dongle 83 17 619 Colour code silver Activates the sensor self test Sensor Diagnostic Dongle 83 17 860 ...

Страница 16: ... sensor page 22 when a pre calibrated sensor is not used The Polytron 7500 is ready for use Check the transmission of the signals between to the control unit and the initiation of alarms see the function group Analogue interface on page 54 The software version the date and the time are displayed Note For the correct operation and functionality it is important to set the date and time The sensor is...

Страница 17: ...utput 3 4 mA Maintenance signal 3 2 mA1 for 1 second1 every 10 seconds1 1 Factory setting can be conﬁgured as desired page 52 Warning signal factory setting off In measuring mode the display shows the actual gas concentration e g when the alarm threshold for the concentration alarm is exceeded if the measured concentration exceeds the full scale value the special symbol Y Y Y Y is then displayed i...

Страница 18: ...ay warnings The information can be retrieved in info mode see page 19 A fault exists see page 36 for information on how to display faults Maintenance signal to the control unit see page 55 The flow monitoring is activated There is a Pyrolyzer fault see page 44 The measured value exceeds the full scale value of the analogue interface The measured value is less than the zero point of the analogue in...

Страница 19: ...erial No Line 4 EEPROM type Line 5 EEPROM version Screen 3 Sensor conﬁguration Line 1 Gas name Line 2 Measuring range cannot be change and unit of measurement Line 3 Measuring range for the analogue interface displayed only if the analogue interface card is installed Line 4 A1 alarm threshold and unit of measurement1 Line 5 A2 alarm threshold and unit of measurement1 1 Displayed only if a relay mo...

Страница 20: ...displayed instead of the date and time or if an incorrect date and time are displayed only after the clock has been reset due to a power failure Set the date and time see page 48 Note If the date and time are not set correctly some functions such as calibra tion cannot be executed ...

Страница 21: ... depends on the sensor being used and on the operating conditions Polytron 7500 calculates from the selected calibration interval see page 58 when the next calibration is due Specific calibration data for the sensor see the Instructions for Use for the Dräger sensor At the latest every twelve months Inspection by specialists The inspection intervals must be established in each individual case and ...

Страница 22: ...page 41 to page 39 Zero gas and calibration gas See the related information in the Instructions for Use for the DrägerSensor Setting up the unit Individual settings can be made via the keypad in menu mode via the HART interface with the Dräger Hand Held Terminal DHHT 1 EN 50073 Guidelines for selection installation use and maintenance of devices for the detection and measurement of ﬂammable gases ...

Страница 23: ...t Incorrect connection can damage the sensor 1 Fit sensor adapter onto the sensor Refit the cover of the Polytron 7500 Check the sensor function The configuration of the Polytron 7500 is kept in its entirety see also Sensor lock on page 57 Disposal of electrochemical sensors Sensors must be disposed of as special waste Note the relevant waste disposal regulations Further information can be obtaine...

Страница 24: ...60 Extended sensor self test function taking such things as the temperature gas monitoring and remaining sensitivity into account During normal operation the sensor status is indicated by the sensor diagnostic icon in the display The sensor is ready The sensor is ready for use but nearing the end of its operating lifetime The sensor is still ready for use but should be replaced as soon as possible...

Страница 25: ... polarity Blue cable to the outside Replace the pump for the principal branch Pump on the left side infront of the rear wall Remove the connector of the pump Remove the upper holder of the pump from the middle sheet Remove the hose from the pump and insert it into the new pump at the same position Refit the new pump with blue label sideways on the lower holder Insert the upper holder of the pump i...

Страница 26: ...en the two screws for fixing on the rear side do not unscrew completely Remove the pyrolysis oven upwards from the holder Remove the hoses to the pyrolysis oven and connect to the new pyrolysis oven at the same position Insert the new pyrolysis oven from above into the holder and tighten the two screws Reconnect the three electrical connections of the pyrolysis oven Refit the cover of the Polytron...

Страница 27: ...er on both sides and 2 lift upwards Disconnect hose connections from the dust filter and connect to the new dust fil ter at the same position Refit the cover of the Polytron 7500 The Polytron 7500 is ready for use again Attention The measurement result that is displayed during the replacement is not correct Attention When the unit is opened there is the danger of scalding yourself on hot parts of ...

Страница 28: ...cable Check the connections 67 Bad contact of the relay module Check the connection of the relay module 100 Unit cannot detect a sensor Remove the sensor and install it again page 23 Check the sensor plug or install a new sensor 101 Sensor data error in the unit Remove the sensor and install it again page 23 If this error occurs again Have the Polytron 7500 checked by suitably qualiﬁed persons e g...

Страница 29: ...more data can be recorded Read out the data Then clear and restart the Datalogger 52 Datalogger is in stack mode and is 90 full Read out the data as soon as possible Then clear and restart the Datalogger 53 No valid date and or time is set Set the date and time page 48 58 Software dongle was removed without log ging off Deactivate the function in the menu Settings Instrument SW dongle XXX dongle p...

Страница 30: ...nnect the unit from the mains and restart it If this error occurs again Have the Polytron 7500 checked by DrägerService Fault Cause Remedy LED lights red The pyrolysis oven is defect Replace the pyrolysis oven page 26 LED lights red Fault in measurement branch pump measurement branch defect Check the hose connections for blockages Replace the pump page 25 LED ﬂashes red An internal ﬂow test is bei...

Страница 31: ...o confirm inputs and selected menus and functions Menu structure Overview page 32 The unit has two operating modes measuring mode and menu mode Menu mode contains the menus Information Calibration and Settings Menu Information The menu Information can be opened by any user but the user is unable to make any changes with this menu option Menu Calibration This menu permits routine operations needed ...

Страница 32: ...e specified page Password for the menu Calibration _ _ _ 1 Password for the menu Settings _ _ _ 2 k Back to measure Information page 35 Information Calibration page 39 Instrument page 36 Settings page 43 Sensor page 37 Datalogger page 38 Calibration Zero calibration page 39 Span calibration page 40 Autocalibration page 41 Settings Instrument page 44 Communication page 51 Sensor page 56 Datalogger ...

Страница 33: ...prompted for the password Use the key to move to the line Enter password and press the key The password entry screen appears Use the and keys to set each of the four positions of the password and press the key to conﬁrm each position After you have conﬁrmed the last position the menu corresponding to the entered password is opened If the entered password is invalid a suitable error mes sage is dis...

Страница 34: ... Selection activated For functions which can be selected and activated activation can be done by pressing the key Top of list displayed There are no further functions menus or sub menus above those current ly displayed List can be scrolled up There are further functions menus or sub menus above those currently displayed End of list displayed There are no further functions menus or sub menus below ...

Страница 35: ...e sensors and the Datalogger Overview Information Information Calibration Instrument page 36 Instrument Settings Sensor page 37 Warnings page 36 Datalogger page 38 Faults page 36 Fault codes page 36 Modules page 36 Sensor Vitality page 37 Last cal date page 37 Next cal date page 37 Sensor temperature page 37 Datalogger Datalogr status page 38 Show graph page 38 ...

Страница 36: ...rder pressing the key after each selection Any existing faults are displayed in clear text If more than one fault exists the number of the currently displayed fault and the total number of faults are displayed in the top right corner example 1 2 screen 1 of 2 Fault codes This function displays any existing faults warning codes in the form of a table If a fault exists the icon is displayed Select t...

Страница 37: ...ion displays the date of the last calibration Select the menu items Information Sensor and Last cal date in this or der pressing the key after each selection The date of the last calibration is displayed Next calibration date This function displays the date on which calibration is next due Select the menu items Information Sensor and Next cal date in this or der pressing the key after each selecti...

Страница 38: ...is order pressing the key after each selection The current status of the Datalogger and the Eventlogger is displayed Activating deactivating the Datalogger see page 59 Activating deactivating the Eventlogger see page 59 Show graph This function is active only if the Polytron 7500 is equipped with the data dongle 83 17 618 see page 15 The measured values of the sensor are displayed graphically on a...

Страница 39: ...ytron 7500 to the third connection of the T piece Calibration procedure using the DrägerSensor XS NF3 as an example Select the menu items Calibration Zero calibration and XS NF3 in this order pressing the key after each selection The message Supply zero gas with flow rate 500 ml min is displayed this flow rate is not to be observed for the Polytron 7500 Supply zero gas to the sensor Select Next an...

Страница 40: ...er No 68 07 068 with the calibration gas and connect to the in let connection of the Polytron 7500 Calibration procedure using the DrägerSensor XS NF3 as an example Select the menu items Calibration Span cal and XS NF3 in this order pressing the key after each selection The values for the calibration gas are displayed for example The calibration gas concentration and unit can be changed Select Cal...

Страница 41: ...calibration interval and the date of the next calibration are displayed Select Back to menu and press the key Sensitivity calibration can be aborted at any time Use the key to move to Back and press the key Autocalibration Autocalibration consists of fresh air calibration followed by sensitivity calibration This function is intended only for users who are familiar with the unit since the sequence ...

Страница 42: ...nds on whether the selected calibration gas supports so called autostability Autostability is supported When the displayed value has stabilised Select Calibrate and press the key Autostability is not supported The instrument evaluates the stability of the signal and automatically executes the calibration procedure The required value and the actual value are now displayed Disconnect the flow of cal...

Страница 43: ... Function key page 49 Device init page 49 SW Dongle page 50 Communication Hart interface 2 2 This menu function can be executed only if the Polytron 7500 is equipped with the appropriate interface card page 51 Analogue interface 3 page 52 LON interface 3 page 55 Sensor Change sensor page 56 Set autocal page 56 Sensor test page 57 Sensor lock page 57 XS NF3 3 3 The sensor shown in this overview ser...

Страница 44: ...witched off please use a flowmeter is dis played Connect a flowmeter Select Next and press the key Use the and keys to set the pump output monitoring the change on the flowmeter Select Next and press the key The flow thresholds are displayed Flow threshold for fault e g 0 3 L min Flow threshold for warning 0 4 L min example The ﬂow thresholds cannot be changed for the Polytron 7500 If this setting...

Страница 45: ...ed The function for setting the alarm direction is opened Select Rising or Falling and press the key to activate your selection Select Next and press the key The function for setting the self hold function of the A1 alarm is opened Select Latching or Non latching and press the key to activate it Select Next and press the key The function for setting the A1 acknowledgement is opened Select Can be a...

Страница 46: ...are made in the same manner as for alarm A1 Set ack This function is used to enable or disable the acknowledgement of the alarms with the key Select the menu items Settings Instrument Alarm and Set ack in this order pressing the key after each selection Select Enable or Disable and press the key to activate it Test alarm A1 This function simulates the A1 alarm state for testing purposes Select the...

Страница 47: ...ces are set to the fault alarm state Passwords This group contains the setting functions for the passwords Password Calibration This function is used to change the password for the menu Calibration Select the menu items Settings Instrument Passwords and Password Cal in this order pressing the key after each selection Select the line for password input and press the key to switch to edit mode Use t...

Страница 48: ... to set the display format for the date and or time Select the menu items Settings Instrument and Time format in this or der pressing the key after each selection Select the desired input line Date format or Time format and press the key to switch to edit mode Use the and keys to select the desired format European or US and press the key to confirm the setting Language This function is used to set...

Страница 49: ...s for Select the menu items Settings Instrument and Device init in this order pressing the key after each selection Select Confirm and press the key to initialise the device Show graph the measured values are displayed on a time axis see page 38 Fault report existing faults are displayed in clear text see page 36 Notice report existing warnings are displayed in clear text see page 36 Fault codes e...

Страница 50: ... each selection Select the line Disable function and press the key to disable the data dongle Sensor test dongle Select the menu items Settings Instrument SW dongle and Sensor test dongle in this order pressing the key after each selection Select the line Disable function and press the key to disable the sensor test dongle Diagnostic dongle Select the menu items Settings Instrument SW dongle and D...

Страница 51: ... series of addresses starting with address 1 This setting corresponds to the HART command 6 Write Polling Address Select the menu items Settings Communication Hart interface and Polling address in this order pressing the key after each selection Use the and keys to set each position of the polling address and press the key to confirm the setting Press the key to confirm the complete polling addres...

Страница 52: ... measurement range When the measuring range of the analogue interface must be adjusted The following corresponds 0 ppm 4 mA Analogue set point Set measurement range 20 mA According to the standard the standard measuring range of the sensor automat ically ends here Warning on off This function is used to switch the warning signal on the analogue interface on and off If the presence of a warning is ...

Страница 53: ... warning signal Select the menu items Settings Communication Analogue interface and Warning level in this order pressing the key after each selection Use the and keys to set each position of the current value and press the key to confirm the setting Press the key to confirm the complete current value Maintenance level This function is used to set the current on the analogue interface for the maint...

Страница 54: ...function is used to set the analogue interface to the fault signal Select the menu items Settings Communication Analogue interface and Test fault in this order pressing the key after each selection Use the and keys to select Enable and press the key to activate it The current for the fault signal is transmitted on the analogue interface Use the and keys to select Disable and press the key to activ...

Страница 55: ... switched off LON interface This function group contains the functions for the LON interface Operation with LON see also Polytron 7500 Operation via LON on page 62 Neuron ID Every Polytron 7500 has a Neuron chip with its own Neuron ID with which the Poly tron 7500 can be identiﬁed in the LON network To display the Neuron ID Select the menu items Settings Communication LON Interface and Neuron ID p...

Страница 56: ... is displayed Select Back to menu and press the key The maintenance signal on the interface remains active until the sensor has warmed up The duration of the warming up period depends on the type of sensor and its history If for example the sensor had already been warmed up on another unit and it was disconnected only for a short time the warming up period may be shorter than that shown in the Ins...

Страница 57: ...f test Select the menu items Settings Sensor XSxx and Sensor self test To start the sensor self test depending on the sensor and or device status se lect Start sensor self test with key and press the key to start After a few seconds the result is indicated in the display To terminate the function Select Back to menu and press the key Sensor lock This function is used to enable or disable the senso...

Страница 58: ...te it The overview of the settings are displayed If the settings are correct Use the key to select the line Confirm and press the key Sensor initialisation This function is used to set all parameters of the sensors back to the factory de fault values Select the menu items Settings Sensor XS NF3 and Sensor init in this order pressing the key after each selection Select Confirm and press the key to ...

Страница 59: ...ntervals of one minute this is sufﬁcient for a monitoring period of 50 hours The monitoring period can be extended considerably by using the setting Trigger page 60 Eventlogger The Eventlogger saves unit and sensor events such as A1 threshold value exceeded ﬂow fault in pump It can save a maximum of 100 events Datalogger on off This function is used to enable or disable the Data or Eventlogger Sel...

Страница 60: ...ue This function can be used to set the trigger value This value refers proportionally to the whole measuring range Example with a measuring range of 500 ppm a trigger value of 2 is entered Then the Datalogger will only store measured values refer to the last stored meas ured value that deviate by more than 10 ppm Select the menu items Settings Datalogger Set Datalogger and Trigger value in this o...

Страница 61: ...r each selection The message Clear Datalogger data is displayed Use the key to select the line Confirm and press the key The data are deleted from the Datalogger Clear Eventlogger This function is used to delete all data from the Eventlogger Select the menu items Settings Datalogger and Clear Eventlogger in this order pressing the key after each selection The message Clear Eventlogger data is disp...

Страница 62: ...es it indicates a warning in the Polytron 7000 Every Polytron 7500 has a Neuron Chip with its own Neuron ID with which the Poly tron 7500 can be identiﬁed in the LON network To view the Neuron ID Select menu items Settings Communication LON Interface and Neuron ID To commission the Polytron 7500 the Neuron ID can be sent to the central unit using the Service PIN function Select menu items Settings...

Страница 63: ... point 3 8 mA Measuring range exceeded 20 mA to 20 5 mA Unit fault 3 2 mA 21 mA Maintenance signal 3 4 mA 0 2 mA constant Digital HART compatible transmission on 2 wire shielded cable optionally LON Supply voltage 24 V DC 2 V 1 5 A Cable inlet M20x1 5 for cable diameter 6 to 12 mm 0 24 to 0 47 Ambient conditions Speciﬁcations for the sensor see the Instructions for Use for the DrägerSensor 0 to 40...

Страница 64: ... 30 ppm C4F6 CAS 685 63 2 Measuring range 0 to 30 ppm C5F8 CAS 559 40 0 83 18 830 Accessories Dräger Polytron 7500 Relay Module 83 18 524 Dräger Polytron 7500 Software Dongles Data Dongle 83 17 618 Sensor Dongle 83 17 619 Sensor Diagnostic Dongle 83 17 860 Calibration accessories Calibration Bag 20 L 68 07 068 Spare parts DrägerSensor XS NF3 for Dräger Polytron 7500 83 18 824 68 11 125 DrägerSenso...

Страница 65: ...erating procedures 33 Calibration 21 Calibration accessories 64 Calibration gas 22 40 Calibration interval 22 CE markings 63 Change sensor 56 Connecting to a HART Multidrop capable central 10 Connecting to the central unit 8 9 10 Control LEDs 18 Data dongle 50 Datalogger on off 59 Datalogger setting 59 Datalogger status 38 Datalogger clearing 61 Date and Time 48 Density of the gas 7 Diagnostic don...

Страница 66: ...lling the docking station 8 Installing the LON communication 11 Installing the Polytron 7500 12 Installing the software dongles 15 Intended Use 5 Internal dust filter 27 Language 48 Last calibration date 37 Liability 4 Line resistance 9 LON interface 55 LON network 62 LON specific data 62 Maintenance 4 21 Maintenance intervals 21 Maintenance level 53 Maintenance signal 17 Maximum line lengths 9 Me...

Страница 67: ... installation 7 Pump 44 Pump for the measurement branch 25 Pump operating time 44 Pump output 44 Relay module 6 Replace the internal dust filter 21 Replace the pump 21 Replace the pyrolysis oven 21 Replace the sensor 21 Replacing the pump 25 Replacing the pyrolysis oven 26 Replacing the sensor 23 Safety 4 Sensitivity calibration 40 Sensor configuration 58 Sensor diagnostic function 24 Sensor drift...

Страница 68: ...b menu Zero calibration 39 Supply voltage 63 SW Dongle 50 Tag 52 Technical Data 63 Test alarm A1 46 Test alarm A2 47 Test fault 47 54 Test functions for the analogue interface 54 Test maintenance 55 Test warning 54 The menu Calibration 39 Time format 48 Transmission of signals to the control unit 21 Trigger on off 60 Trigger value 60 Unique Identifier 51 Unit calibration 22 Unit settings 22 Warm u...

Страница 69: ...9023927 2nd edition May 2007 Page 69 of 72 Pages Drilling templates Drilling templates Pyrolyzer Docking Station 120 mm 04523927_1 eps 95 mm ...

Страница 70: ...Page 70 of 72 Pages 9023927 2nd edition May 2007 ...

Страница 71: ...9023927 2nd edition May 2007 Page 71 of 72 Pages ...

Страница 72: ...ng the details below UK Office Keison Products P O Box 2124 Chelmsford Essex CM1 3UP England Tel 44 0 330 088 0560 Fax 44 0 1245 808399 Email sales keison co uk Please note Product designs and specifications are subject to change without notice The user is responsible for determining the suitability of this product ...

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