Clean Room Particle Counter User Directions
- Caution for Extremely Long Measurement Periods
The instrument is unsuitable for continuous measurements for a prolonged period. It may hasten deterioration of the light source and inner pump, and require maintenance in a shorter interval.
- Sampling Environment
The instrument is designed for use in clean rooms or clean environments where the concentration is below the maximum measurable concentration of 2,000,000 particles/cf. Using the instrument in a high temperature/humidity environment or in an environment with high particle concentration may cause damage to the instrument or shorten the maintenance interval.
- The Counter Components
- Measuring modes
- REPEAT Mode
Suitable for repeated measurement at a same location.
- SINGLE Mode
Measurements stops automatically when the time has been elapsed.
- CONT (Continuous) Mode
Suitable for measurement of random time.
- CALC (Calculation) Mode
Processes results of repeated measurements measured by REPEAT, SINGLE and CONT modes. Only the calculation result of average,maximum, minimum, and standard deviation will be stored, and detail data from the repeated measurements will NOT be stored.
- ISO>4 Mode
Suitable for cleanliness assessment of ISO Class 5 to 9.
- REMOTE Mode
Measurement is controlled externally by using the software supplied with the instrument.
- Sample and INT time
The relationship between the sampling time and the INT time that INT time includes the sampling time and suspension time as shown below:
The laminar hood were tested using the particle counter above, the results are summarized by the following table:
| Location | Time and Date | Measuring Mode | NO. of runs | Time Period per run (Min.) | 0.3, 0.5, 5 \mu m | Notes |
| Laminar hood parallel to the chamber frame | 5:35-6pm 7/27/11 | CALC | 5 | 5 | 0.3 av.=4 CNT,STD=3, 0.5 and zero value for 0.5 and 5 | the speed of the fan is high |
| Laminar hood table | 4:40-5:05pm 7/27/11 | CALC | 5 | 5 | 0.3 av.=16800 CNT,STD=281, 0.5 av.=1316 CNT,STD=122 and 5 av=11 STD=3 | the speed of the fan is high, the distance is further than the one in the previous test |
| Laminar hood table | 3:35-4pm 7/27/11 | CALC | 5 | 5 | 0.3 av.=231 CNT,STD=29, 0.5 av.=14 CNT,STD=4 and zeros for 5 | the speed of the fan is low |
| LDS | 5:05-5:30pm 7/26/11 | CALC | 5 | 5 | 0.3 av.=10 CNT,STD=20, 0.5 av.=1 CNT,STD=1 and zeros for 5 | filter is used, the device is zero calibrated, there are some counts in the first run but I ignored them (cleaning) sisnce there is not any counts observed after the first one. |
| LDS | 3-4pm 7/26/11 | CALC | 10 | 5 | for 0.3 av.=528100 CNT,STD=451 , 0.5 av.=41970 std=4107, 5um av=451 std =218 | using the isokinetic probe |
| Laminar hood in LDS | 4:00-4:20pm | CALC | 10 | 2 | av.=0 CNT,STD=0 for all sizes | Device is not calibrated, fan on max. speed |
| Laminar hood in LDS | 4:25pm | CALC | 5 | 10 | and zero values for the other sizes | Device is not calibrated , fan on max. speed |