Teflon Reference Thermistor Probe, Spade Lugs
The Fluke Calibration 5611T-S
Secondary Reference Thermistor probes have the stability necessary for use as high-accuracy thermometry standards. The thermistors are available in a variety of sheath materials appropriate for your specific application. The 5611T S has spade plugs for its connector tips.
The Fluke Calibration secondary reference thermistor has a small 0.12 inch diameter with a 1.1 inch probe tip length and very small sensing elements, which means they require far less immersion than a PRT to avoid errors caused by stem effect. Self heating is usually negligible, giving them 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'll be especially interested to know thermistors are less susceptible to mechanical shock than PRTs. The bottom line may be better accuracy in fieldwork. If you're looking for economical lab-grade thermistor probes for accurate work across a narrow temperature range, Fluke Calibration 5611TS Secondary Reference thermistor probes are the best you can buy.
The 5611T Teflon Probe’s unique construction makes it an especially versatile thermistor. With a tip that is just 3 mm (0.120 in) in diameter and a Teflon coating that makes it impervious to most liquids, the Teflon Probe is handy for measuring in a wide variety of applications, including bio-pharmaceuticals. It’s even immersible to nearly 6 meters (20 ft) and flexible enough that you could roll it up into a ball in your hand if you wanted to!
The 5611T’s thermistor bead is encapsulated in a mylar sleeve that is encapsulated inside a Teflon sleeve. The Teflon sleeve is melted around the Teflon-insulated cable, forming a moistureproof seal.
As with Hart’s other secondary reference thermistors, our Teflon thermistor has a very small sensing element, so its self heating is minimized, making its measurements in air more accurate than those of a PRT. Its small size also allows measurements to be taken more quickly and without needing as much immersion as a PRT.
If your application involves frequent handling, you’ll 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 thermistors, so better resolution and accuracy are possible for a lower cost. This probe has a negative temperature coefficient (NTC) of resistance.
Several thermometer readout options are available for use with the 5611T: the 1504 Tweener, the 1521 and 1522 Little Lord Kelvin handheld thermometers, the 1529 Chub-E4, the 1560 Black Stack, and the 1575A and 1590 SuperThermometers. The most accurate readings are obtained when coupled with the Black Stack’s 2563 Standards Thermistor Module or 1590 Super-Thermometer, but if you want to measure up to four thermistors simultaneously you need the Chub-E4.
What’s more, this probe comes with a NIST-traceable calibration with k=2 uncertainties of ± 0.010 °C. The expected difference between calibrations during a single year interval is expected to be less than 0.010 °C. A NVLAP accredited calibration as a single thermistor or as a system combined with its readout is also available.