5 year service contract for TSI Instruments Ltd

Carry out 12 monthly service/calibration of the two filter testers to include as a minimum a thorough check of all filter testers, changing the Ion Balance Needles, carrying out the aerosol mass concentration using gravimetric test, verification of the penetration data, cleaning the vacuum pump filters and replacing the flow line filter. This is to be done every year for the next 5 years.