Environmental Laboratory

  • Particle Counting in Water and Waste Water

Particle Counting in Water and Waste Water

Jul 15 2020 Read 312 Times

In the standard methods for the examination of water and wastewater which is prepared and published by the American Public Health Association, American Water Works Association and the Water Environment Federation, for water testing, the method number 2560, it included 3 instrument types: electrical sensing zone instrument, light-blockage instruments, and light scattering instruments.

Besides the types of instrument, the sample collection is another important point which need extremely care. In the APHA 2560, section 3 Sample collection and handling mentioned on how to obtain the samples in full details and at the end, it mentioned users need to minimise the time between sampling an analysis, is at all possible, make measurements immediately after sampling. Therefore, traditional laboratory type instruments need extra steps to keep the sample in 4 degree Celsius in travelling and return to normal temperature right before measurement, that is quite trouble to follow.

A portable liquid particle counter, using light-blockage, will be a good choice for the application because you can run the measurement run after sampling. However, these types of instrument may require custom hardware to maintain a stable sampling flow rate. HIAC PODS+ includes an integrated internal pump that replaces the need for CO2 cartridges and optimises the portability and degassing capability of the instrument. With the new integrated pump, and with a 6 hours military grade lithium-ion rechargeable battery, it is complete portable, reliability and test more samples on one charge.

The instrument can be calibrated using Polystyrene Latex spheres in water with a dynamic range from 1.3 microns to 100 microns, with this range, the user can assign particle sizes to nine available sizes with the minimum size increment between channels is 0.1 micron.

HIAC PODS+ portable liquid particle counter can measure water sample in bottle mode or online mode. In bottle mode, it allows test operators to analyse the sample wherever the system is located and move easily from one sample point to another. Operators can pre-set sample recipes and obtain the results in less than 60 seconds. You can ask anyone to operate the system as it is one button sampling, no special training or expertise required.

HIAC PODS+ portable liquid particle counter can also use to monitor the filtration system. It has a “Filter Cart Mode”, which users can identify conditions, PODS+ will monitor until the condition is met, and sends out control signal to start or stop. The conditions can be reaching cleanliness by count or by volume (dirty to clean or clean to dirty).

Reference: Standard methods APHA 2560.

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