What this application involves
“CIP” — Clean-in-Place — originated in dairy and brewery industries where pipework and tanks were cleaned without disassembly. In rack-washing the analogue is “load-once, clean-automatically”: the operator loads a trolley, selects a stored PLC profile, presses Start. The machine executes wash, rinse, sanitization, drain and (optionally) dry without further intervention, logging every parameter.
This is the modern operational paradigm for any food production facility under FDA, USDA, BRC, SQF, FSSC 22000 or IFS audit. The audit demands documented sanitation; the documentation must be machine-generated, not operator-attested.
Why traditional methods fail
Hand-controlled wash bays — even with mechanical dishwashers — depend on operator discipline for chemical dose, dwell time, and temperature. An auditor cannot verify after the fact that the third-shift operator dosed correctly. The audit-critical question — “prove that this load was sanitized to spec” — has no good answer when operators are the control.
How the PTW-1900 implements automated CIP
Three layers of automation:
- PLC cycle profiles — pre-programmed Standard, Heavy, Allergen Reset, Sanitization-Only, custom. Operator selects from touch-screen; cannot manually override chemistry or temperature.
- Chemical dosing pumps — alkaline detergent and acid rinse dosed by PLC per cycle. Concentration is set by engineering, not by operator.
- Cycle logging — every cycle records timestamp, profile selected, operator ID (barcode scan), wash temp peak, rinse temp peak, cycle duration, abort/complete status. CSV export.
The audit-critical chain — recipe → execution → record → audit submission — is closed automatically.
Recommended cycle profile structure
A typical PTW-1900 install carries 4–6 stored profiles:
- Standard — daily food-soil cleaning + sanitization
- Heavy — carbonized residue, extended cycle, extended detergent
- Allergen Reset — sanitization-only, no detergent, between production runs of differing allergen profiles
- Sanitization Only — shift change reset, 82°C rinse for 8 min
- Acid Cycle — for mineral scaling removal on monthly basis
- Validation — PLC ramps temperatures slowly for thermocouple validation testing
Automated CIP FAQ
Q: Can the PLC integrate with our plant MES / SCADA system? A: Yes. Modbus RTU is standard. OPC-UA, Profinet, Ethernet/IP available on request. Cycle data can stream live into Rockwell FactoryTalk, Siemens WinCC, Wonderware, Ignition or any standard MES platform.
Q: How do we restrict which profiles each operator can run? A: Operator authorization is controlled via the touch-screen access PIN (or RFID badge on optional reader). The PLC restricts profile selection per operator role. Audit-level operations (validation, profile edit) require supervisor credentials.
Q: What is the chain of evidence for HACCP / SQF audit? A: (1) Equipment spec sheet → installed equipment achieves 82°C sanitization. (2) Cycle log CSV → each cycle achieved 82°C in fact. (3) Operator audit log → which operator ran which cycle. (4) Chemical dose log → which chemicals at what concentration. All four export from PLC.
Q: Can we add a cycle profile after deployment? A: Yes. Profile edits are supervisor-level on the touch-screen. We provide a free service to design new cycle profiles for unique production scenarios — submit your soil description and target HACCP control point, we return a tested profile.
Q: Does the PTW-1900 produce its own audit-ready PDF report? A: The PLC exports CSV. We provide a downloadable Excel template that ingests the CSV and produces an audit-ready PDF report (cycle history, sanitization confirmation, allergen reset evidence) on demand.