Cryogenic temperature monitors
211 | 218E | 218S | 240-2P | 240-8P | 224-12 | |
Description | Single-input compact temperature monitor | 8-input focused temperature monitor | 8-input expanded feature temperature monitor | 2-input temperature module for distributed systems | 8-input temperature module for distributed systems | 12-input temperature monitor |
Lowest reasonable sensor temperature measurement | 1.2 K | 1 K | 0.3 K | |||
Sensor compatibility | ||||||
Cernox® and Rox™ | 7.5 kΩ maximum | Full Cernox and Rox sensor range (100 kΩ) | ||||
Diodes | Silicon and GaAlAs diodes | Silicon diodes only (e.g., DT-670) | Silicon and GaAlAs diodes | |||
Platinum |
100 Ω and 1000 Ω | |||||
Remote interfaces | ||||||
IEEE-488.2 (GPIB) | — | — | ✔ | — | — | ✔ |
USB | — | — | — | ✔ | ✔ | ✔ |
Ethernet | — | — | — | — | — | ✔ |
RS-232C | ✔ | ✔ | ✔ | — | — | — |
PROFIBUS (RS-485) | — | — | — | ✔ | ✔ | — |
Number of alarms | 2 | 16 | 16 | — | — | 12 |
Number of relays | 2 | — | 8 | — | — | 2 |
Analog voltage out | 0 V to 10 V (1 output) | — | 0 V to 10 V (2 outputs) | — | — | — |
4 mA to 20 mA output | ✔ | — | — | — | — | — |
Model 224 features
- Equipped with 12 sensor channels
- Precisely measures in both higher temperature and cryogenic applications—down to 300 mK
- Ideal for multi-sensor lab uses, particularly for monitoring Cernox® sensors
Model 218 features
- Operates down to 1.2 K
- 8 sensor inputs
- Supports diode and RTD sensors
- IEEE-488 and RS-232C interfaces, analog outputs, and alarm relays
Model 211 features
- Operates down to 1.2 K
- 1 sensor input
- Supports diode and RTD sensors
- 0 V to 10 V or 4 mA to 20 mA output