Specifications
Cold Head SCAI model CH-204S.
Pumping Speeds
Air 1500 liters/second
Water 4200 liters/second
Argon 1250 liters/second
Hydrogen 2300 liters/second
Nitrogen 1470 liters/second
Throughput Argon, 11.0 Torr-liters/sec or 870 sccm.
Capacity Argon, 1200 std. liters
Hydrogen, 25 std. liters
Crossover Rating 220 torr-liters (air)
Cooldown Time 75 minutes to 20 K
Weight 16 kg (35 lbs.)
Mounting Flange ISO 200 mm, ANSI 6” or CF 10”
Connections Pumpout Port: ISO NW25
Nitrogen Purge Gas Port: Parker UltraSeal, size 6
Relief Valve Vent Connection: See Figure 9b
Temperature Sensor Port: 5 pin electrical receptacle
Gas Line Couplings
Supply and return helium gas connections are size 8, male (8M) Aeroquip self-sealing
couplings.
Cold Head Cable Receptacle
The receptacle is a 4 pin, 8 shell Detoronics connector.
Standard Single Silicon Diode Temperature Sensor and Optional Dual Temperature
Sensor (for MCC)
With a 10 µA DC current excitation, the encapsulated silicon diodes supplied with the cryopump
have the following voltage/temperature characteristics:
(K)
(Volts)
(K)
(Volts)
8 1.4723 24 1.1146
10 1.3956 40 1.0855
12 1.3385 60 1.0530
14 1.2918 80 1.0190
16 1.2517 100 0.9832
18 1.2151 160 0.8655
20 1.1759 200 0.7806
22 1.1293 300 0.5567
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