• Good long term stability: ±10 mK from 1.4 K to 325 K
• RF-800 offers a wide temperature range from 0.65 K to 500 K
• Linear response above 100 K
• Excellent resistance to ionizing radiation
• Small chip size available with extremely fast thermal response time

The Lake Shore thin film rhodium-iron temperature sensor offers significant advantages over comparable wire-wound resistance sensors. The thin film sensors feature a smaller package size, which makes them useful in a broader range of experimental mounting schemes, and they are available at a much lower cost. Additionally, they have proven to be very stable over repeated thermal cycling and under extended exposure to ionizing radiation. Furthermore, the thermal time constant of thin film rhodium-iron cryogenic temperature sensors (bare chip) is on the order of milliseconds, while the thermal time constant of wire-wound resistors is on the order of seconds.

The RF-800 rhodium-iron resistance sensor features monotonically decreasing resistivity from 500 K to 0.65 K, although sensitivity (dR/dT) falls off in the region of 30 K. From 100 K to 273 K the resistance changes linearly with temperature to within 1 K. RF-800-4 sensors also exhibit monotonic response at higher temperatures, hence their adaptability for use over the broad range from 1.4 K to 500 K.