An HTST pasteurizer's legal controls — the recording controller, the flow diversion device, the timing pump, the holding tube and the regenerator pressure-differential controller — are what make the milk legally pasteurized. The regulatory agency tests and seals them. Maintenance's part is to prove, every week, that the seals are still intact, the recorder reads no higher than the indicating thermometer, and pasteurized milk is still at higher pressure than raw in the regenerator, because a broken seal or a drifting recorder is found by an inspector otherwise, and the product made since the last good check is in question.
The steps ChatterFix schedules for this PM. Every step is a checkable item on the work order — a technician can speak their way through it without touching a keyboard.
An HTST pasteurizer's legal controls — the recording controller, the flow diversion device, the timing pump, the holding tube and the regenerator pressure-differential controller — are what make the milk legally pasteurized. The regulatory agency tests and seals them. Maintenance's part is to prove, every week, that the seals are still intact, the recorder reads no higher than the indicating thermometer, and pasteurized milk is still at higher pressure than raw in the regenerator, because a broken seal or a drifting recorder is found by an inspector otherwise, and the product made since the last good check is in question.
Seals get knocked during unrelated work and nobody notices until the next regulatory visit. A recorder that reads a degree or two off the indicating thermometer becomes 'normal'. When it surfaces, the plant is not arguing about a repair — it is holding product and waiting for a re-test before it can pasteurize again.
Weekly is a sensible floor for a plant running daily, with the start-up divert check and the daily recorder-versus-indicating check done by operations. The regulatory tests — most quarterly, holding time twice a year and again whenever a timing-pump seal is broken — are on the agency's schedule, not this one; this check makes sure nothing between them goes unrecorded. It never adjusts a legal setting.
This procedure — and every other PM for your industry — is already built into ChatterFix. Pick your industry and it lands on the right equipment, on the right interval, in about three minutes.