Table 3.
Summary of SWPF test observations for the handheld CPC and PAMS
| Summary of SWPF test observations |
|||||
|---|---|---|---|---|---|
| Disadvantages |
|||||
| Portable Instrument | Advantages | # trials (Conc. Level)A | # bending issuesB | # issues | |
|
| |||||
| Handheld CPC 3007 | Observations on subjects: * CPC is lightweight (1.7 kg or 3.8 lb). ) *Easy to mount 2 CPCs to a vest and wear them when conducting normal work Observations on CPCs: Withstand workplace environment up to 6 h. |
Observations on subjects: None Observations on CPCs: * Able to measure only particle counts (not particle size). * The CPC showed tilt condition when bending at the waist > 50o, but the tilt condition normally corrected itself. |
48 (L) 48 (M) 48 (H) |
2 2 2 |
0 0 0 |
| PAMS |
Observations on subjects: Can mount one PAMS to a backpack and wear it when conducting normal work. Observations on PAMSs: * Able to measure particle counts and sizes. * Withstand workplace environment up to several hours if routinely cleaning the charger. |
Observations on subjects PAMS is heavy (~5 kg or 11 lb), so can carry only one in the backpack. Observations on PAMSs: * The PAMS showed tilt condition when bending at the waist > 50o (normally corrected itself). * Need to clean the charger during sampling to avoid a problem (charger failure). * Extended period for charger to stabilize. |
48 (L) 48 (M) 48 (H) |
1 1 1 |
5 4 5 |
A
(Conc. Level): Concentrations: L (low, 8 × 103 particles/cm3), M (medium, 5 × 104 particles/cm3), and H (high, 1 × 105 particles/cm3).
B
Bending issues: 6 cases out of 144 trials for 2 CPCs carried by test subjects at 3 concentrations and 3 cases out of 72 trials for one PAMS carried by test subjects.