Leica manual Technical Data, Refrigeration system CM1950, 50 Hz CM1950, 60 Hz

		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.

①acc. to CECOMAF: liquid temperature 45 °C, evaporation temperature: -25 °C

Leica CM1950 – Cryostat 15