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## P.I.D.

P.I.D.: Simple: PID Reading x CF = Actual PPM Present in Atmosphere Entry Team Turn Back: Desired Reading on PID ÷ CF = Reading on PID in PPM Predicted PID: 1300 Rule for Known Chemical PPM ÷ CF = Predicted Maximum PID Reading in PPM Obtain 10% LEL in PPM: PLEL x 10,000 ÷ 10 [...]

By |March 22nd, 2017|Meter Reference Formulas|Comments Off on P.I.D.

Predicting Lower Explosive Limit meter readings: Multiply the Conversion Factor (CF) times the Published Lower Explosive Limit (PLEL) times 100 = ? CF x PLEL x 100 = ? Divide ? into the maximum achievable PPM from the 1300 rule Example: Propenol's CF for LEL is 2.1%, PLEL is 2.5%, vapor pressure is 17mmHg vp [...]

LEL Meter Prediction: vp = 33 mmHg, LEL CF = 2.2, PLEL = 2.0% Which of the following is the correct predicted LEL meter reading for this material? 33 x 1300 = ? CF x PLEL x 100 = ? ? ÷ ? = predicted meter LEL reading

LEL Meter Prediction: Normal butyl alcohol (n-butanol) vp = 6 mmHg, PLEL = 1.4%, LEL CF = 2.8. Which of the following is the correct predicted LEL meter reading for n-butanol?

LEL Meter Predictions: Known chemical vp = 3 mmHg, PLEL = 1.2%, LEL CF = 2.5 (per manufacturer's spec's) Which of the following is the correct predicted LEL meter reading for this chemical?

Predicting PID, O2 and LEL Readings: PID formula for predicting is: vp x 1300 ÷ CF = ? O2 formula for predicting is: vp x 1,300 = ? ÷ 50,000 = O2 drop (20.9% - O2 drop) LEL formula for predicting is: (step #1) vp x 1300 = ? (step #2) CF x PLEL X [...]

Predicting PID, O2 and LEL Readings: PID formula for predicting is: vp x 1300 ÷ CF = ? O2 formula for predicting is: vp x 1,300 = ? ÷ 50,000 = O2 drop (20.9% – this O2 drop) LEL formula for predicting is: (step #1) vp x 1300 = ? (step #2) CF x PLEL [...]

Predicting meter readings: Use the NIOSH Pocket Guide, WISER, this App or some other reference to look up values for isopropyl alcohol (2-propanol). This meter's manufacturer indicates PID CF is 6.0 & LEL CF is 2.2. Which of the following is the correct predicted PID, O2 and LEL meter readings for isopropyl alcohol (IPA)?