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 | ✔ | — | — | — | — | — |
240 Series Features
- Two or eight cryogenic temperature sensor inputs
- Supports industry-leading Lake Shore Cernox®, platinum, and other RTDs, plus DT-670 diodes
- Precision measurement circuitry with on-board conversion to calibrated temperature units
- Monitor temperatures down to 1 K and up to 800 K
- Current reversal to minimize thermoelectric offsets
- Front-mounted OLED screen for temperature and status reporting
- Fully configurable through direct USB connection
- PROFIBUS-DP communication integrates with distributed PLC-based control architectures
- Easy DIN rail mounting with integrated rear connections for shared power and network
Model 224 features
- Lake Shore’s most capable cryogenic temperature monitor
- Equipped with 12 sensor channels for maximum monitoring capabilities
- Precisely measures in both higher temperature and cryogenic applications—down to 300 mK
- Ideal for multi-sensor lab uses, particularly for monitoring Cernox® sensors
- Ethernet, USB and IEEE-488 computer interfaces
- Proven, intuitive interface
- Customizable display enables you to label individual input channels
Model 218 features
- Operates down to 1.2 K with appropriate sensor
- 8 sensor inputs
- Supports diode and RTD sensors
- Continuous 8-input display with readings in K, ºC, V, or Ω
- IEEE-488 and RS-232C interfaces, analog outputs, and alarm relays
- Available in two versions: Model 218S and 218E
Model 211 features
- Operates down to 1.2 K with appropriate sensor
- One sensor input
- Supports diode and RTD sensors
- 0 V to 10 V or 4 mA to 20 mA output
- Large 5-digit LED display
- RS-232C serial interface and alarm relays