Holding Time / Residence Testing / Validation


Pasteurisation is common in many food and beverage industries and the critical component of any pasteurisation process is the holding tubes just prior to the divert valve, the tubes will continually hold the pasteurised product for the designed amount of time required to ensure pasteurisation has been achieved.

Holding time test

Holding time verification test

To ensure all harmful micro-organisms are killed, pasteurisation involves heating the product to international standards before it is cooled again. A combination of time and temperature is used to ensure that the taste, appearance and nutritional value of the product are not altered.

The holding / residence time should be established as a “Critical Control Point” in any maintenance and preventative maintenance system.  Without the monitoring and measuring of this critical aspect of the pasteurisation process, the likelihood of product safety hazards could occur with the possibility of damage to your brand image which can be caused by negative media attention.

Independent Integrity Inspection Limited (INDEi) provides the expertise and the solution to certify the holding time process / verification to the standards accepted by food safety directives and standards, using equipment manufactured by the world’s leader in design and manufacture of holding time testing equipment.

INDEi offers the holding time analysis system as part of the overall periodic maintenance system for plate and tubular pasteurisers and heat exchangers or as a stand-alone test complying with legislation with a reliable, hygienic, accurate and trace-ability measuring solution.

Using the saline conductivity method and equipment provided by Lumenite Control Technology, the Company is enabled to reproduce the results time and time again, year after year as long as the critical parameters or components have not been changed ie pump, modification of pipework, change of flow meter.