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Leica CM1950 – Cryostat
3. Technical Data
Refrigeration system CM1950, 50 Hz CM1950, 60 Hz
Cryochamber
Temperature range 0°C to -35°C ± 5 K, adjustable in 1K increments, 0°C to -35°C ± 5 K, adjustable in 1K increments
at ambient temperature of 20°C ambient temperature of 20°C
Cooling time to -25°C approx. 5 h approx. 5 h
Cooling time to -35°C approx. 8 h approx. 8 h
Refrigeration capacity ① 690 W 690 W
Cut-out pressure 25 bar 25 bar
Safety factor 3 3
Refrigerant* 300 g (± 5 g) refrigerant R -404A* 300 g (± 5 g) refrigerant R -404A*
Compressor oil* 0.6 l EMKARATE RL22S, ICI* 0.6 l EMKARATE RL22S, ICI*
Defrosting of cryochamber
Automatic defrosting
Programmable: Yes (hot gas defrost) Selectable time Yes (hot gas defrost) Selectable time
Defrosting intervals 1 defrost in 24 h 1 defrost in 24 h
or manual hot gas defrost or manual hot gas defrost
Defrost time: 12 minutes 12 minutes
Automatic shutoff Defrost: at -5 °C chamber temperature at -5 °C chamber temperature
Quick-freeze shelf
Minimum temperature: - 42 °C (+ 5 K), at chamber temp. -35°C - 42 °C (+ 5 K), at chamber temp. -35°C
Number of freezing stations: 15+2 15+2
Defrost Manual hot-gas defrost Manual hot-gas defrost
Peltier element
Number of freezing stations: 2 2
Max. temperature difference: 17 K, at chamber temp. of -35°C 17 K, at chamber temp. of -35°C
Specimen cooling
Temperature range -10 to -50 °C ± 3 K -10 to -50 °C ± 3 K
Refrigeration capacity① 320 W 320 W
Cut-out pressure 25 bar 25 bar
Safety factor 3 3
Refrigerant and quantity at 230V/50 Hz 140 g (± 5 g), refrigerant R-404A* at 120V/60 Hz 110 g (± 5 g), refrigerant R-404A*
at 100V/50/60 Hz 110 g (± 5 g), refrigerant R-404A*
Compressor oil* 0.4 l alpha 22, Kyodo* 0.4 l alpha 22, Kyodo*
Defrosting of specimen head
Automatic defrost: No No
Manual defrost
Defrost time 15 min. 15 min.
*) Refrigerant and compressor oil must be replaced by qualified, authorized service personnel only.
① acc. to CECOMAF: liquid temperature 45 °C, evaporation temperature: -25 °C