What they are used for
A pump enables collection of gas, vapour or particle samples using suitable tubes, filters or other media. It forms part of personal sampling, where the sampler inlet accompanies the person. Wearing a running pump does not prove that the sample represents exposure: position, duration and observed tasks also matter.
Equipment selection
The method determines the required flow range. The pump must also maintain that flow against sampler resistance for the intended time. Battery life, weight, robustness, fault alarms and suitability for environmental conditions form part of selection. Where explosion risk exists, suitability for that environment requires a specific check.
Assembly and operation
The assembly is prepared following the method and manufacturer’s instructions. Leaks, kinked tubing and connections that loosen during work must be avoided. The sampler is positioned in the breathing zone and the pump in a stable location that does not obstruct the task. How to report a stoppage or discomfort is agreed with the worker.
Control flow and time
Flow checks must represent the resistance of the system used; required checks before and after sampling are recorded. A depleted battery or clogged filter can reduce the collected volume. A full shift is not reconstructed by multiplying nominal flow by eight hours when undocumented interruptions occurred.
A detectable failure example
In a hypothetical example, a pump used during sanding stops because filter resistance is too high. The technician records the time and checks the assembly. The analysis is not presented as a complete shift: sample validity is assessed under the procedure, and duration redesigned or sampling repeated where necessary.
Information accompanying the sample
Pump and sampler identification, flows, start and finish, stoppages, person or job and tasks enable interpretation. Equipment maintenance status is also retained. This traceability prevents a low concentration from being attributed to good prevention when the real problem was that the system drew less air than intended.
