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Instruction Manual MIC type EC-912 

Revision no.4 

2 / 38 

Table of Contents 

 

General information ................................................................................. 5

 

 

Introduction ..........................................................................................................5

 

 

General description ..............................................................................................6

 

 

Applications ..........................................................................................................6

 

 

Specifications .......................................................................................................7

 

 

System specifications ...........................................................................................7

 

 

Measuring Ionization Chamber (MIC) type EC-912-10 .........................................7

 

 

Analog MIC Control Unit (AMCU) type EC-912-20 ...............................................8

 

 

Intelligent MIC Control Unit (IMCU) type EC-912-25 .............................................8

 

 

Flow Control Unit (FCU), type EC-912-40 ............................................................8

 

 

Vacuum Pump (VP), Thomas VTE 3, type EC-999-08 .........................................9

 

 

Installation .............................................................................................. 10

 

 

Preparation for use .............................................................................................10

 

 

Unpacking ..........................................................................................................10

 

 

Mains cord .........................................................................................................10

 

 

Performance check using an Analog MIC Control Unit (AMCU) .........................11

 

 

Performance check using an Intelligent MIC Control Unit (IMCU) .......................11

 

 

Installation of Measuring Ionization Chamber (MIC) ...........................................13

 

 

Installation of Vacuum Pump (VP) ......................................................................15

 

 

Installation of Control Cabinet (CC) ....................................................................15

 

 

Operation ................................................................................................ 16

 

 

Operating controls, connectors and indicators ....................................................16

 

 

Measuring Ionization Chamber (MIC) .................................................................16

 

 

Control Cabinet (CC) ..........................................................................................16

 

 

Analog MIC Control Unit (AMCU) .......................................................................16

 

 

Intelligent MIC Control Unit (IMCU) ....................................................................17

 

 

Flow Control Unit (FCU) .....................................................................................17

 

 

Vacuum Pump (VP)............................................................................................17

 

 

Smoke density measurements ...........................................................................18

 

 

Measuring set-up ...............................................................................................18

 

 

Measuring procedure with AMCU .......................................................................18

 

 

Theory of operation ............................................................................... 20

 

Summary of Contents for EC-912

Page 1: ...ument no B 281 0006 00 Date 8 December 2020 force FORCE Technology Park All 345 2605 Br ndby Danmark 45 43 25 00 00 info forcetechnology dk forcetechnology com forcetechnology com Instruction Manual f...

Page 2: ...Preparation for use 10 Unpacking 10 Mains cord 10 Performance check using an Analog MIC Control Unit AMCU 11 Performance check using an Intelligent MIC Control Unit IMCU 11 Installation of Measuring I...

Page 3: ...2 Analog MIC Control Unit AMCU 23 Intelligent MIC Control Unit IMCU 24 Maintenance and service 25 Periodic maintenance 25 Measuring Ionization Chamber MIC 25 Analog and Intelligent MIC Control Unit AM...

Page 4: ...e humidity List of subscripts and abbreviations MIC Measuring Ionization Chamber MIREX Measuring InfraRed EXtinction FCU Flow Control Unit AMCU Analog MIC Control Unit IMCU Intelligent MIC Control Uni...

Page 5: ...in the past See ref 1 3 4 However since the measuring characteristics of the ionization chamber depend on several parameters including the design of the ionization chamber it is important to reach int...

Page 6: ...rmed to an expression for smoke density which can be presented on the display of the AMCU Furthermore a recorder output is provided The AMCU is provided with an electrical calibration facility for che...

Page 7: ...um pump are intended for operation in normal laboratory environment However the measuring ionization chamber may be applied in the temperature range 0 100 C Measuring Ionization Chamber MIC type EC 91...

Page 8: ...00 to 1 00 Recorder output Uc Approx 14 to 25 VDC corresponding to the chamber voltage Intelligent MIC Control Unit IMCU type EC 912 25 Readout on front panel 1 pc LED Power The color of the LED is gr...

Page 9: ...3 type EC 999 08 Technical data Mains voltage 230 V 10 50 60 Hz 115 V 10 60 Hz 100 V 10 50 60 Hz Motor rating Approx 0 15 kW Capacity 3 5 m3 h 58 l min 50 Hz 4 2 m3 h 70 l min 60 Hz Degree of protect...

Page 10: ...pump 1 Instruction manual in USB stick 1 Certificate of calibration of the MIC chamber Inspect the items for possible damage due to transportation and report to the forwarding agency as soon as possi...

Page 11: ...MODE button to indicate mode Uc The display shall read a value between 14 0 and 25 0 19 0 is typical The voltage on recorder output Uc at the rear of the MCU shall be the same as the value on the disp...

Page 12: ...contain clean aerosol free air When the calibration is done and the MIC system is ready for normal operation the Last Calibrated time stamp is updated i Connect the vacuum pump VP and air outlet on th...

Page 13: ...meter is adequate Keep a distance of min 12 cm to objects behind the mounting surface in order to prevent the cable and hosing from being bent sharply The MIC should not be mounted too close to device...

Page 14: ...Instruction Manual MIC type EC 912 Revision no 4 14 38 MIC chamber mounting holes 152mm 4 5mm Fig 2 3 MIC chamber mounting holes...

Page 15: ...ere the smoky air can be led to the outside via a hose So the VTE 3 pump can be placed in a suitable place in the laboratory Refer to the installation instructions from Thomas in Pump spec 2012 BA187...

Page 16: ...binet Connector MIC The female plug of the multicable fits into this connector Align the code marks and push the plug gently into the connector Do not use force The plug on the cable is secured with a...

Page 17: ...he middle of the ball Rear panel see Fig A 1 4 in Annex 1 Air inlet Pipe branch for hose to air outlet on MIC Air outlet Pipe branch for hose to air inlet on VP Finger screws Screws for disassembling...

Page 18: ...ear of the CC d Cable to recorder from outputs at the rear of the CC if used e Mains cord for VP and CC Measuring procedure with AMCU a Turn the flow meter needle valve in the FCU fully C W b Switch o...

Page 19: ...tor extinguish and adjust the Uc trimmer on the AMCU until the display reads 0 00 or the recorder output X is 0 0 VDC g Subject the MIC to the smoke exposure the density of which shall be measured h S...

Page 20: ...e deflected towards the negative and positive electrode respectively Some of the ions recombine before they reach the electrode surfaces and become neutral air molecules Other ions exchange electrons...

Page 21: ...it volume Besides smoke density the X Y and Y20 values depend on the design of the ionization chamber and a number of environmental parameters So the readings obtained from different ionization chambe...

Page 22: ...r voltage of approx 19 V Electronics for impedance transformation An impedance transforming circuit is built into the MIC The principle of the impedance transforming circuit is shown in Fig 4 2 2 The...

Page 23: ...splay and the recorder output X when the AMCU is in X mode During calibration the relay in the MIC disconnect the chamber voltage and the chamber current becomes zero The voltage to the MCU also becom...

Page 24: ...Instruction Manual MIC type EC 912 Revision no 4 24 38 Fig 4 2 3 Principle of AMCU analogue circuit Intelligent MIC Control Unit IMCU Please refer to separate IMCU user manual...

Page 25: ...ng other parts of the MIC by loosening the locking screw refer to Fig A 1 2 in Annex 1 and unscrewing the source holder Make sure that the serial number of the source corresponds to the ionization cha...

Page 26: ...polycarbonate is claimed to be resistant respectively not resistant is given below The list should not be regarded complete Polycarbonate is resistant to Alcohol Ethanol Benzine n Butyl or sec Butyl A...

Page 27: ...e filter and the two hoses c Loosen the four screws holding the flow meter mounting plate and pull back the mounting plate with the flow meter approx 5 cm The screws are accessible through holes in th...

Page 28: ...n the type of smoke measured In some applications it may be more practical to replace the MSA filter with a 10 12 mm thick polyurethane filter cut circular with a diameter of 68 mm The consequence of...

Page 29: ...hints Flow system If it is not possible to adjust the flow rate on the flow meter to 30 l min then there is either a leak or a block in the VP the FCU or the hose connections First check the performan...

Page 30: ...current in the MIC is ILEAK 100 1 00 XLEAK pA The leakage current in the MIC should be less than 1 pA If the leakage current in the MIC is greater than 1 pA the electrode assembly is probably covered...

Page 31: ...chnology contact information If you need any assistance for calibration spare parts or repair of your MIC please contact FORCE Technology Venlighedsvej 4 DK 2970 H rsholm Denmark Tel 45 72 19 40 00 e...

Page 32: ...E Burry Standard Ionization Chambers Tagungsbericht zum 7 internationalen Vortragsseminar ber Probleme der automatischen Brandentdeckung Aachen 5 und 6 M rz 1975 Page 243 255 5 CEN European Committee...

Page 33: ...ring equipment EC 912 a b c d e a Measuring Ionization Chamber MIC type EC 912 10 b Control Cabinet CC type EC 999 04 c Analog MIC Control Unit AMCU type EC 912 20 or Intelligent MIC Control Unit IMCU...

Page 34: ...onization Chamber MIC EC 912 10 with chamber housing re moved a Measuring electrode b Guard ring c Wind shield d Radioactive source holder e Chamber housing f Locking screw for radioactive source hold...

Page 35: ...type EC 912 20 a 3 1 digit LCD display b Mode selector button c Mode indicators Uc and X d Mode indicators Y and Y20 not used e Calibration button f Calibration relay ON indicator g Auto calibration s...

Page 36: ...ring power up and flashing red in case an error is detected b LED Calibrating The color of the LED is green under normal operation red during calibration and flashing red in case an error is detected...

Page 37: ...Instruction Manual MIC type EC 912 Revision no 4 37 38 Figure A 1 5 Flow control unit type EC 912 40 Flow meter needle valve...

Page 38: ...utlet pipe branch for hose to vacuum pump B Analogue recorder output for chamber voltage Uc C Analogue recorder output for smoke density X D EMI filter with mains switch mains socket and fuse holder E...

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