THERMO SCIENTIFIC SAVANT MICROMODULYO FREEZE DRYER

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THERMO SCIENTIFIC SAVANT MICROMODULYO FREEZE DRYER

Previously used at a local university, Powers on and works. Sold as is as shown in pictures below on item description page. Only includes what is shown in pictures below. 

The MicroModulyo is the ice condenser section of a freeze drying system. It is a low cost unit suitable for freeze drying biological research materials and preparations in a laboratory. The MicroModulyo requires only the attachment of a pump and a drying accessory for samples to form a complete freeze drying system. The MicroModulyo has a condenser chamber, a refrigeration system and a control sys- tem with temperature indicator. The refrigerant used in the MicroModulyo is CFC-free. All the MicroModulyo components are housed in a steel cabinet which is designed for bench top use.When used with suitable accessories, the MicroModulyo can be used to freeze dry materials in bulk trays, round bottomed flasks, tubes, vials or ampules. Alternatively, the MicroModulyo can be used as a low temperature vapor trap (cold trap) that may be attached to an existing evaporation facility. 

THE CONDENSER CHAMBER 

The condenser chamber can trap up to 1.5 liters of ice before it needs to be defrost- ed & cleaned. It contains a cooling coil which condenses and freezes water vapor to protect the vacuum pump. The temperature of the cooling coil under normal operating conditions with no load applied is approximately –50 ̊C. A 229 mm diameter accessory flange (1), is at the top of the condenser chamber. All Modulyo drying accessories with small flange (approx. 215 mm) diameter are com- patible. The large chamber top opening allows easy inspection, cleaning and defrost- ing of the condenser chamber and enables high vacuum pumping rates to be attained. A valved drain pipe runs from the base of the condenser chamber to the drain outlet (3) on the front of the MicroModulyo. The drain valve on the front of the MicroModulyo (2) controls the operation of the valve in the drain pipe. The drain pipe is used to drain liquid condensate from the chamber and to admit air into the system. A vacuum pipeline connects the chamber to a vacuum pump connector (4) on the front of the MicroModulyo. You can connect a vacuum pump to this connector to evacuate the condenser chamber and produce the high vacuum necessary for freeze drying. 

THE BAFFLE TUBE 

A baffle tube is supplied with the MicroModulyo. The baffle tube is installed inside the condenser chamber to extend the vacuum pumping pipeline further into the condens- er chamber. This results in an improved distribution of ice. The baffle tube must be used when a load capacity of 1 liter or more will be collected, to ensure an open path for vapor flow within the condenser. If you want to use the MicroModulyo as a freeze dryer, you must connect it to a two- stage vacuum pump and attach a drying accessory. When you use the MicroModulyo as part of a freeze drying system, we recommend that you keep accurate records of all operating parameters (sample load, drying times, and so forth). This data will help you to determine the optimum cycle for efficient operation with various products. Some factors which affect the freeze drying process are described in the following sections. 

APPLICATIONS 

You must first pre-freeze the product prior to placing it on (or in) the drying accessory. The thickness of the ice (and hence the product) will affect the length of time needed to dry a given sample. In general, the thickness should be less than 10 mm. Rate of freezing can also affect drying times; slow freezing rates produce larger ice crystals hence a more porous “ cake ” , which dries more quickly.  

THE FREEZING PROCESS 

When the condenser has reached its operating temperature (~-40 ̊ C) the operating temperature lamp goes on and the vacuum pump can be switched on (see Sections 3.3 and 4.5). The pressure in the condenser chamber then starts to drop, producing the conditions necessary for freeze drying. The time required to dry a given product is determined by a number of factors. These include type of product, mass and thickness, type of container, temperature of the product and condenser, rate of heat transfer into the product, pressure and system performance. Freeze drying requires an input of heat energy to the product to change the ice into water vapor. When using the MicroModulyo, this energy may be absorbed solely from the surroundings or, alternatively, a heated accessory may be used to supplement this heat input. If you use a heated accessory, the accessory should not be switched on until the pressure in the condenser chamber has fallen to 1 mbar (0.76 Torr) or lower. An accessory vacuum gauge must be used to measure system pressure; see Section 6.2 When deciding on the quantity of heat input required, or when optimizing the drying cycle for a particular product, it is important to observe the physical appearance of the product whenever possible during the drying process. If the product has been cor- rectly frozen, it will usually appear to be uniform in color and compact. If the product is uneven in color, or if signs of melting and foaming are visible, then the product may have been incorrectly frozen or may have undergone some physical change, possibly from the application of too much heat. A wide range of factors has to be considered when trying to optimize the drying cycle for a given product. To assist in this optimiza- tion, we recommend that you take note of the rate of change of both temperature and pressure within the condenser chamber during the freeze drying process 

SPECIFICATIONS 

Dimensions, H x W x D: 305 x 330 x 432 mm (12 x 13 x 17 in) Accessory-flange diameter: 229 mm (9.0 in) Weight: 27 kg (59.5 lb) Enclosure rating (BS 5490): IP 22 Ambient operating temperature range: 5 to 24 ̊ C Maximum ambient storage temperature: 50 ̊ C Condenser chamber Ice capacity in 12 hours: 1.0 kg (2.2 lb) Maximum ice capacity: 1.5 kg (3.3 lb) Operating temperature: -50 ̊ C Instrumentation On/Off switch: Rocker switch with thermal magnetic circuit breaker Operating temperature lamp: Remote sensing thermostat . 

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