Commercial Food Freeze Dryers

The FDRS freeze dryers feature sturdy, stainless steel fabricated drying chamber which is engineered and produced strictly follow pressure vessel directive, long lifespan and never distortion, external of drying chamber wall, up to 100mm thick PUF is covered for insulation.

A group of S-shaped coils is installed behind, beneath or lateral of the shelves, to condense vapors that come from products. The coils are cooled by refrigerant direct expand, each compressor has independent circuit and each circuit contains a coolant distributor that evenly distribute refrigerant to coils to guarantee all coils have the similar temperature for evenly icing.

The shelf system is heat transfer fluid based: Glycol circulates inside sandwich type heat-plates, the glycol can be chilled and heated, so raw materials can be freeze dried in-situ. This design ensures maximum temperature uniformity of all heat-plates. In addition, an extra heat-plate is installed on top of shelf module to provide extra energy for thermal balance.

Temperature sensors are installed in both the fluid inlet and return pipe, as well as the fluid heating bar point, to control and monitor shelves temperature. Temperature variation between the heat-plates is < +/-2C.

The heat-plates are made of S/S or aluminum alloy, surface polished and flatness better than +/-1mm/m. Products are placed in trays and load onto the heat-plates, in place freezing and drying, the heat transfer method is by conductive heating (radiative heating optional).

The fluid channels in heat-plates adopt special ‘internal welding’ technology to ensure the surface flatness, and delicate designed fluid circuits to ensure the good temperature uniformity. Leak test for every heat-plates and entire shelf module to ensure the air tightness. Temperature variance between heat-plate points is < +/-2C.

Subsystems such as vacuum pumps, refrigeration compressors, heat transfer fluid pump and heaters are placed below and behind the product chamber. Each sub-system as an individual module and linked together by the PLC. This design has been proved easy to install and to maintain. A wide range of accessories and options can be selected to match the particular needs of customers.

The components that installed in FDRS freeze drying systems are from international brands or under international standards. So that you can be rest assured that the machine always in ready condition, and get prompt services.

All FDRS models are equipped with our FD-MEGA controller Ver 2.0. The HMI interface enables you control all the key components On/Off and valves Open/Close through the touch screen, and real-time monitoring their work status. Which means during whole freeze drying process, nobody is needed go to technical room to do manual works.

Unless specified, all the valves that use to isolate air and water are pneumatically operated, quick action and capable of auto close once there is an electric interrupt, to protect your products. e.g. vacuum pump anti suck-back valve, vacuum release valve, condenser defrost water supply, overflow and drain valve.

High advanced PLC and user-friendly touch screen HMI is applied to all our FDRS freeze dryers. To control all the machine functions, performs all interlock checks, and generates processes and device alarms. Capable of automatic execute the freeze drying steps you are programmed, monitoring system running status and protect your freeze dry system all the time.

The control system has been pre-programmed a bunch of protection logic such as: System auto shut down if chamber pressure not reduce; Vacuum pump will not active if condenser temperature not reach set, to avoid vapor flows into vacuum pump and damage it; Once failures appear, sound-light alarm and touch screen HMI shows possible failure reason, meanwhile, all air and water isolate valves auto close to maintain chamber pressure and protect your products.

The delicate designed touch screen HMI guarantees your drying data and drying steps that stored in HMI will not lose once a power outage, and the drying process will continue after power restoration. As well as, it supports operator modify the current-running freeze drying steps (when machine is in operation), system will auto execute the latest modified drying recipe.

The control interface has the functions of:

• Graphic displays main components working status and key parameters.
• Freeze drying recipes management.
• Real-time freeze drying trend and historical curve review.
• Drying data-logging and can be exported via USB.
• Automatic and semi-automatic working.
• Users and authorizations.
• Sensors calibration.