Parallel to the greater demand for drinking water quality (e.g. as
defined in the EU drinking water directive) there is also a growing interest
in particle measuring technology. Particles, namely suspended solids, are
undesirable in drinking water for hygienic reasons: they may be pathogens or
other unwanted microorganisms, or organisms may be attached to or enclosed
in particles. Further, particles can reduce the effectiveness of
disinfection substances. The aim of water treatment is therefore to produce
drinking water that is as low as possible in particle content.
Particle content is normally monitored by measuring turbidity; this
measurement provides a summary statement about the total particle content.
In some cases, for example in membrane filter systems, or generally for
enhanced water quality security, an additional measurement of the particle
concentration in the range of 1 to 5 micrometers may be advisable.
Thus SIGRIST has now expanded its range of turbidity measurement
instruments for drinking water treatment with two particle counters that are
specifically designed to meet the requirements for water treatment. The
OPM32 has 32 size channels, a data logging function, PC software and an
integrated sampling pump, all of which make it a high-quality instrument for
laboratory measurements, process optimization, and detailed examination of
filtration processes. The OPM3 offers 3 size channels, 4..20 mA current
output, and hydrostatic sampling feed control without wearing parts – it is
the ideal solution for the continuous monitoring of filter systems. Both
instruments measure particles from 0.9 micrometers and upwards and have
proven their effectiveness in various installations.