Laboratory-Scale Pasteurization Vessel PA-TK Series

Overview

The PA-TK Series Laboratory-Scale Pasteurization Vessel is an engineered platform designed to replicate industrial pasteurization conditions under controlled, small-batch laboratory settings. Based on the fundamental principles of time–temperature lethality kinetics—governed by D-value and Z-value relationships—the system enables precise thermal processing validation for heat-sensitive liquid and semi-liquid products. Unlike benchtop water baths or generic jacketed reactors, the PA-TK integrates process-critical subsystems—including programmable temperature ramping, agitation control, and rapid cooling pathways—into a single compact architecture. It supports both low-temperature long-time (LTLT, e.g., 63°C/30 min) and high-temperature short-time (HTST, e.g., 72°C/15 sec) regimes per ISO 7754, FDA Pasteurized Milk Ordinance (PMO), and Codex Alimentarius standards. Its design targets R&D labs, quality assurance teams, and pilot-scale food/pharma formulation units requiring reproducible thermal treatment data prior to scale-up.

Key Features

• Scalable working volumes from 3 L to 100 L (PA-TK-03 through PA-TK-100), accommodating viscosity ranges up to 50,000 mPa·s without flow stagnation.
• Food-grade 316 stainless steel contact surfaces (ASME BPE compliant finish Ra ≤ 0.8 µm), fully traceable material certifications supplied with each unit.
• Triple-layer vessel construction: inner product chamber, steam/electric heating jacket, and outer insulation layer filled with closed-cell polyurethane foam (thermal conductivity ≤ 0.022 W/m·K).
• Programmable PID temperature controller with ±0.3°C accuracy across 20–120°C range; integrated PT100 sensors at multiple axial positions for thermal uniformity mapping.
• Variable-speed top-entry agitator (50–300 rpm), optionally configurable with high-shear rotor-stator heads (tip speed up to 15 m/s) for emulsions or suspensions.
• Conical bottom geometry (60° apex angle) with central bottom discharge valve and full-access hinged lid for CIP/SIP compatibility.
• Dual heating mode selection: saturated steam (0.1–0.4 MPa) or electric immersion heaters (3 kW–12 kW, depending on model); independent cooling circuit with external chiller interface (0–10°C supply).
• Modular stainless steel frame with casters and leveling feet; footprint optimized for standard fume hood or ISO Class 7 cleanroom placement.

Sample Compatibility & Compliance

The PA-TK series accommodates heterogeneous fluid matrices including dairy concentrates, plant-based beverages, protein solutions, fruit pulps, sauces, and microbial culture broths. Its non-turbulent yet effective agitation prevents shear-induced denaturation while ensuring thermal homogeneity—critical for validating microbial log-reduction in compliance with ISO 11133 (microbiology) and USP (sterility assurance). All electrical components meet CE/IEC 61000-6-2 EMC and IEC 61000-6-4 emission standards. Pressure-rated variants (up to 0.6 MPa) comply with PED 2014/68/EU when specified. Documentation packages include Factory Acceptance Test (FAT) reports, material traceability records, and calibration certificates for all critical sensors.

Software & Data Management

Units are supplied with optional DAQ software (Windows-based, USB/Ethernet interface) supporting real-time logging of temperature, RPM, pressure, and elapsed time at user-defined intervals (1–60 sec). Data exports to CSV or Excel format with embedded metadata (operator ID, batch number, protocol name). Audit trail functionality complies with FDA 21 CFR Part 11 requirements when configured with electronic signatures and role-based access control. Optional integration with LabVantage or Thermo Fisher SampleManager LIMS via OPC UA is available upon request.

Applications

• Thermal death time (TDT) curve development for pathogen surrogates (e.g., Listeria innocua, Bacillus coagulans).
• Shelf-life prediction modeling using accelerated storage tests under controlled thermal history.
• Process validation for novel dairy alternatives (oat, almond, pea protein beverages) where Maillard reaction kinetics must be balanced against microbial kill.
• Formulation screening for stabilizer efficacy under repeated thermal cycling.
• Supporting GLP-compliant studies required for EFSA or FDA GRAS submissions.

FAQ

Can the PA-TK system be validated for GMP environments?
Yes—when equipped with calibrated sensors, audit-trail software, and documented IQ/OQ protocols, it meets core elements of Annex 15 and ASTM E2500 for equipment qualification.
Is steam sterilization of the vessel possible?
The PA-TK-XX models rated for 0.4 MPa jacket pressure support SIP cycles up to 121°C; validation requires thermocouple mapping per ISO 17665-1.
What maintenance intervals are recommended?
Gasket inspection every 200 cycles; agitator seal replacement every 12 months or 2,000 operating hours; annual recalibration of temperature and pressure transducers.
Can custom geometries or sensor ports be added?
Yes—custom port layouts, additional RTD locations, pH/DO probe sleeves, or inline viscosity monitoring interfaces can be incorporated during manufacturing.
Does the system support automated recipe execution?
With optional PLC upgrade (Siemens S7-1200), users may store and recall multi-step thermal profiles with interlocked safety logic (e.g., agitator start before heating, cooling activation post-hold).