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240 Series input modules

240 Series cryogenic temperature modules

2 or 8 cryogenic temperature sensor inputs
Supports industry-leading Lake Shore Cernox®, platinum, and other RTDs, plus DT-670 diodes
Monitor temperatures from 1 K to 800 K
PROFIBUS-DP communication integrates with distributed PLC-based control architectures
Additional RS-485 communication protocols: Modbus RTU and ASCII Serial

New 240 temperature module communication protocols

NEW Expanded RS-485 communication options

Lake Shore 240-2P and 240-8P modules now offer greater system integration flexibility with support for additional communication protocols over the built-in RS-485 interface. Alongside the existing PROFIBUS-DP protocol, users can now select Modbus RTU multidrop communication or Lake Shore ASCII point-to-point communication. These new options simplify integration with PLCs, industrial controllers, embedded PCs, SBCs, and a wide range of automation and control software platforms.

Firmware version 2.4 and later includes support for these communication modes and is installed on units shipped after August 31, 2026. Customers with earlier units can upgrade existing firmware in the field using the MeasureLINK 240 firmware updater, available from the MeasureLINK 240 software page.

240 Series software page ▶

Simplifying large-scale cryogenic temperature measurement

The 240 Series offers a convenient, modular input solution for precision monitoring of cryogenic temperature sensors in large-scale applications employing distributed PLC-based control.

Lake Shore benchtop cryogenic instruments are trusted throughout the world for precision temperature measurement—now that same measurement performance can be achieved in widely distributed high-energy applications like particle accelerators and fusion reactors, as well as other large industrial sites.

		Integrates seamlessly with industry-leading Lake Shore Cernox^® RTDs, platinum RTDs, and DT 670 silicon diodes, providing the ideal solution for performing temperature measurements over a PLC network

		Native support for Profibus-DP, Modbus RTU, and Lake Shore ASCII communication, allowing this module to be integrated into a wide range of PLC networks and control systems

		Temperature values are communicated directly with the PLC master device, removing the need to use additional costly analog conversion equipment or complex PLC programming to generate temperature values

		Measurement circuitry based on Lake Shore’s industry-leading benchtop instruments, allowing for longer cable runs between sensor and module; ideal for applications where sensors must be located in hazardous environments

		Normal mode with EMF-cancellation and signal filtering for the best measurement possible or high-speed mode for the fastest notification of a temperature change

		A high-quality OLED display on the front of the unit provides helpful status and measurement data; this is in addition to being able to access this information via the PLC network or the local USB connection

		Convenient pluggable connectors allow individual sensors to be disconnected for maintenance without losing readings from other sensors on the same module

		Easy DIN rail mounting with integrated rear connections allowing power and fieldbus communications to be shared between modules