PPI Sampling with Buck Libra Pumps
Different kinds of PPIs and Bulk Libra pumps available:
- 8 LPM PPI (Red): Enhances sensitivity (for short-term and/or low concentration sampling) using high flow pumps LP-12 or LP-20
- 4 LLPM (Orange) PPI: Enhances sensitivity; TWA sampling for ≥ 4 hours using LP-5 pumps
- 2 LPM (Ivory) PPI: 8-hour TWA sampling using LP-4 pumps
LP-4 Pump
LP-5 Pump
Calibration of the Pump
Equipment needed:
PPI
Buck Libra Pump
1/4” Tygon Tubing
Rotameter
Calibration Adapter
- Ensure the pump has run for 5 minutes before calibrating.
- Align the bottom of the calibration adapter with the inlet plate of PPI and press down firmly until the calibration adapter’s O-ring is engaged and creates an even seal.
- Use flexible tubing to connect the exhaust of the Disposable PPI to the inlet of a sample pump.
- Use flexible tubing to connect the inlet of the calibration adapter to the suction port (outlet) of a calibrator. (1st picture: Front view. 2nd picture: top view)
- Calibrate to 2 L/min for the 2 L/min PPIs, 4 L/min for the 4 L/min, or 8 L/min for the 8 L/min PPIs. Use the top and bottom arrows to increase or decrease the flow rate of the pump.
- When calibration is completed, disconnect the tubing from the calibrator and calibration adapter.
- Firmly pull/twist to remove the calibration adapter from the Disposable PPI inlet plate.
Sampling Set-Up
- Write sample ID on sampling label provided. Adhere sampling label to bottom of base plate.
- Remove protective end cap from exhaust.
- Use flexible tubing to connect the exhaust of the Disposable PPI to the inlet of a sample pump.
- Clip Disposable PPI onto a worker’s collar or lapel in the breathing zone or in the area to be sampled.
- Clip sample pump at the worker’s waist or close to the Disposable PPI.
- Turn on pump and record pertinent sample data (ex: sampling start time).
- After the desired sample time has elapsed, turn off the pump and unclip sampler from sampling location.
- Apply Post-use label to inlet plate to seal the sampler.
- Record sample stop time on label on the bottom of sampler.
- Disconnect sampler from pump and reinstall protective end cap on the exhaust.
- Package and transport samples and blanks and unused media in respective bags provided, to the laboratory for analysis.
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