The second generation of the MIC smoke measuring equipment.
|  | GENERAL
The MIC has been developed specifically for reference measurements of smoke density by Cerberus Ltd. of Switzerland. DELTA Electronics Testing has been granted an exclusive license to manufacture and sell the equipment to customers worldwide. The MIC instrument is based on the ionization principle.
The MIC is suitable for smoke measurements e.g. in connection with testing of smoke detectors. The instrument complies with the European Standards EN54-7 and EN54-9, issued by the European Committee for Standardisation (CEN). In addition the instrument will be suitable for the UL smoke box and other applications where accurate and reproducible smoke measurements are required. |
APPLICATIONS
Reference measurements of smoke density by smoke detector testing:
- In smoke tunnel measurements according to EN54-7.
- In fire sensitivity testing according to EN54-7/9.
- In the UL smoke box measurements according to UL 217 and UL 268.
- In other applications where accurate smoke measurements are required
TECHNICAL SPECIFICATIONS
The MIC smoke measuring system type EC-912 consists of the following parts:
- A MIC smoke measuring head.
- A multicable, 10 m (other lengths on request).
- A MIC control unit with power supply.
- A flow control unit with filter.
- A vacuum pump.
- Accessories, instruction manual, etc.
The smoke measuring head is installed at the measuring site and connected to the control unit via the multicable. The control unit, flow control unit and power supply are housed in a cabinet which can be placed in an operator room. The vacuum pump can be placed in a convenient location.
SYSTEM SPECIFICATIONS
Calibration:
Manual calibration from front of control unit.
Mains supply:
100-240 VAC, 50-60 Hz without switchover.
Cabinet:
19 inch bench top/rack cabinet with power supply for MIC.
MEASURING HEAD
Chamber quiescent current:
100 pA (nominal).
Chamber impedance:
1.9 x 1011 W ± 5%.
Radioactive source:
Am241.
Activity:
129.5 kBq (3.5 m Ci) ± 5%.
Average a - energy:
4.5 MeV ± 5%.
Time delay:
£10 sec. at 30 l/min. flow rate.
Smoke sensitivity:
The measuring head is adjusted against DELTA’s reference MIC to within ± 3% smoke sensitivity. Calibration certificate is enclosed with each measuring head.
CONTROL UNIT
Readout:
3.5 digit LCD display. Chamber voltage or smoke density X can be selected.
Analogue outputs:
X (0.0 - 10.0 VDC), chamber voltage Uc (14-25 VDC approx.) Load impedance ³100 kW.
FLOW CONTROL UNIT
Flow rate:
Adjustable between 0 - 50 l/min.
Filter:
Replaceable filter element.
VACUUM PUMP
Mains requirements:
100 VAC ± 10%, 50 Hz or
115 VAC ± 10%, 60 Hz or
230 VAC ± 10%, 50-60 Hz
Motor rating:
Approx. 0.15 kW
Capacity:
Approx. 60 l/min. |
Testing
Aircraft and airport noise
