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No. 24
Aerosol Correction Factors
| DOP Substitute liquid |
Generator Pressure Factors |
Internal Reference Factors |
| DOP |
1.00 |
1.00 |
| PAO |
1.15 |
0.73 |
| DOS |
1.22 |
0.96 |
| Mineral Oil |
1.10 |
0.90 |
| Ondina Oil |
1.34 |
0.79 |
| Kaydol |
1.18 |
0.92 |
| Polyethylene Glycol |
1.33 |
0.89 |
| Paraffin Oil |
1.21 |
0.89 |
| Corn Oil |
1.17 |
0.88 |
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The above values are for use when substitute
liquids are used in-place of the liquid specified for the
Factory equipment calibration and setup.
The generator pressure factors are
used as multipliers for the applied pressure to a Type III-A
Laskin nozzle generator.
Example:
- DOP-20 psi applied with dilution airflow of 135 cfm
yields 100 mg/m3
- PAO-23 psi (20 psi x 1.15 correction factor) applied
with dilution airflow of 135 cfm yields 100 mg/m3
Internal reference factors are multipliers
for the reference setting required for a100% reading. There
are two examples that follow, one for analog and one for digital
photometers.
Note: Digital photometers apply the correction
factor to the 100% reference value used for DOP.
Example 1: Analog series - TDA-2D, TDA-2E
- DOP-10.0% setting required for 100% response to 100
mg/m3
- PAO-7.3% setting (10.0% x 0.73 correction factor) required
for 100% response to 100 mg/m3
Example 2: Digital series - TDA-2G
- DOP with P1 selected - 100 required for 100% response
to 100 mg/m3
- DOS with P3 selected - 0.96 (0.96 X 100 DOP value) required
for a 100% response to 100 mg/m3
Note: The above correction factors apply
only to air operated generators. If a thermal type generator,
TDA-5A or TDA-5B, is being used the upstream concentration
must be sampled to obtain a 100% setting.
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