New ISO Calibration Standard New Equipment Useful Information Contact us
NEW ISO CALIBRATION STANDARD
Recently ISO have introduced a new worldwide standard, ISO21501-4, for the Calibration of Particle Counters. The purpose is to standardise the way in which counters are calibrated and to improve accuracy between different brands of particle counter. OptiCal Sciences is proud to announce the introduction of this new calibration to all our CLiMET Instruments customers, in our workshop or onsite at their facility.
One of the main provisions of the new standard is the requirement to test the counting accuracy of the Unit Under Test (UUT). In the factory this is achieved by generating a mono-sized aerosol of known particle size and then counting each particle as it enters the UUT. This requires a controlled environment and very expensive equipment to achieve. In the field, the Standard allows this to be completed by using a Secondary Reference Unit (SRU) and comparing its results with UUT, see panel below.
Count Accuracy Test
CLiMET Instruments have developed the SRU and associated software to allow this test be carried out on all their instruments. If the UUT’s results match those of the SRUs within a certain tolerance, then this test is passed.
OptiCal Sciences is able to offer calibration and maintenance services for most brands of air and liquid particle counters, aerosol photometers and HEPA filter testing equipment.[Back to Top]
Setting Alarm Limits
It is straightforward to set count alarm limits for each channel in a CLiMET Particle Counter. However, recently we have noticed some customers incorrectly programming alarm limits.
The limits for each particle size are set by the ISO 14644 Standard or EUGMP Annex 1. However, these limits are for a sample of one cubic meter (1000 litres). If an operator sets these as their limit, then they must sample a full cubic meter. If an operator were setting the sample volume to a smaller volume of, for example, 100 litres, then the operator would need to divide the standard’s limit by 10 to get the correct proportional alarm limit.
So please remember, when setting limits only use the full standard specified limits if a full cubic meter is being sampled, otherwise the limits must be proportional to the actual volume sampled. For more information please see the Operator’s Manual or contact the following representatives:
New Instrument Return Form
From OptiCal Sciences (Ireland) Ltd:
For Health and Safety reasons, OptiCal Sciences Ireland is introducing a new customer return form for every instrument serviced. All customers will have to complete the “Equipment Authorisation Request Form” and state that it is free of potential hazards. Thank you in advance for your co-operation.
This policy is already in practice at OptiCal Sciences UK.
NOTE: A copy of the Equipment Return Form can be found at the bottom of our website (http://www.optical-sciences.co.uk)[Back to Top]
Please contact us for more information, pricing and availability
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