The Fluke Calibration 5611TM Teflon Probe with Mini Banana Plugs, 0.12 in. x 1.1 in., 0 °C to 100 °C, 20 ft. Lead is an especially versatile PTFE coated thermistor probe. With a PTFE encapsulated tip that is just 3 mm (0.12 in) in diameter and a PTFE coating that makes it impervious to most liquids, the PTFE Probe is handy for measuring in a wide variety of applications, including bio-pharmaceuticals. It is even immersible to nearly 20 feet and flexible enough that you could roll it up into a ball in your hand.

The 5611T-M thermistor bead is encapsulated in a Mylar sleeve that is encapsulated inside a PTFE sleeve. The PTFE sleeve is then melted around the PTFE-insulated cable, forming a moisture-proof seal.

Higher performance

The Fluke Calibration 5611T-M not only has a small diameter, but a very small sensing element, which means it requires far less immersion than a PRT to avoid errors caused by stem effect. Self heating is usually negligible, giving it an advantage when taking measurements in air. Its small size also improves response time, allowing measurements to be taken more quickly.

If your application involves frequent handling, you will be especially interested to know thermistors are less susceptible to mechanical shock than PRTs. The bottom line may be better accuracy in fieldwork.

Additionally, higher base resistance and larger resistance coefficients make it easier to achieve precision readings with this thermistor; it has a negative temperature coefficient of resistance (NTC).

Readouts

This probe comes in a complete assembly ready for use, and each works well with the uncertainties of Fluke Calibration thermometer readouts: the 1504 Tweener, the 1523 and 1524 Handheld Thermometers, the 1529 Chub-E4, the 1560 Black Stack, and the 1575A and 1590 Super-Thermometers. The 5611T-M provides the most accurate readings when coupled with a 2563 Standards Thermistor Module or 1590 Super-Thermometer, but most portable when used with a handheld reference thermometer.

Calibrated Accuracy

What's more, the Fluke Calibration 5611T-M is accurate to ± 0.01 °C and covers the temperature range of 0 °C to 100 °C. It comes with a NIST-traceable calibration and a resistance-versus-temperature table printed in 0.1 °C increments that can be interpolated to 0.0001 °C. NVLAP accredited calibrations as single thermistors or as systems combined with their readouts, are also available.