MRC FIGR-100 Скачать руководство пользователя страница 3

The refrigeration unit is protected against overpressure and compressor overload. 
with insufficient ventilation of the condenser (e.g. dirt deposits) the equipment is 
switched off. 

This cooling process is a self-refrigerating cascade type.   
A mixture of non-flammable and safe refrigerants is compressed and circulated by a 
compressor. In a simplified version, the cycle comprises:   
(a) compressing a mixture of refrigerants,
(b) partially condesning the higher boiling fractions in an air-cooled condenser,
(c) withdrawling and throttling the condensate to produce cooling which condenses
the remaining vapors in a special heat exchanger, 
(d) throttling and evaporating this latter condensate in a coil to produce cooling at
very low temperatures, 
(e) passing the refrigerant leaving the cooling coil back through the heat exchanger
to the compressor. 

Basic Auto-Cascade Refrigeration Cycle 

Operating pressures and compressor temperatures are similar to those in 
air-conditioning systems. The compressor lubricating oil circulated with the discharge 
vapors is promptly returned to the compressor without reaching the very low 
temperature portions of the system. This eliminates the common problems of oil 
plugging in evaporators and expansion devices too frequently experienced in low 
temperature systems. The mixed refrigerant charge is hermetically sealed into the 
system; normally neither it nor the compressor lubricating oil requires replacement or 
recharging. 

Содержание FIGR-100

Страница 1: ...ctions and safety notes If you have any questions please phone us Follow the instructions on setting up operation etc This is the only way to exclude incorrect operation of the equipment and to ensure...

Страница 2: ...n the probe and line The flexible line to the cold probe should have no sharp bends nor signs of broken tubing 2 Unpacking Goods are packed carefully largely preventing transport damage After unpackin...

Страница 3: ...r d throttling and evaporating this latter condensate in a coil to produce cooling at very low temperatures e passing the refrigerant leaving the cooling coil back through the heat exchanger to the co...

Страница 4: ...sures Control unit The control unit with indication and operating functions The equipment is provided with a LED display to indicate the measurements and settings as well as the operational status The...

Страница 5: ...off Remove the liquid nitrogen cold trap from the vacuum system and insert the cold probe in its place Make certain there are no sharp bends or strains on the flexible insulated line leading to the co...

Страница 6: ...ess Field Parameter Table Pressing can go to the next parameter pressing or can modify a parameter The equipment will escape auomatically from the parameter table if no key is pressed within 30 second...

Страница 7: ...ial 5 Maintenance 5 1 Maintenance and Periodic Inspections The only component requiring maintenance is the air cooled condenser It should be kept clean enough for free air flow through it Accumulated...

Страница 8: ...servicing it is advisable to contact our Technical Service department If the equipment has to be returned to the factory please ensure that it is carefully and properly packed MRC accepts no responsib...

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