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Teflon Encapsulated Thermistor
The 5611T is an especially versatile Teflon coated
thermistor probe. With a Teflon encapsulated tip that is
just 3 mm (0.12 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 20 feet 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 then melted around the Teflon-insulated
cable, forming a moisture-proof seal.
Stainless Steel Sheathed Thermistors
Our stainless steel metal-sheath probes include our 5610-6
and 5610-9 immersion probes, as well as our 5665 fully
immersible probe. These probes are great for measuring in
air, liquid or soil.
Silicone Coated Thermistor
With a diameter at the tip of just 1.5 mm (0.06 in), the
5611A's tip has the smallest diameter of any of our
secondary reference thermistors and can fit nearly anywhere.
Its faster response time, flexible sheath, and silicone
coating make the 5611A great for use in many applications.
However, applications involving silicone oil could damage
the thermistor and should be avoided.
Higher Performance
All of Hart's secondary reference thermistors have small
diameters 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. Their
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.
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. All of these thermistors have a
negative temperature coefficient of resistance (NTC). For
additional information about thermistors, please see
“Thermistors: the under-appreciated temperature standards”
in our current catalog.
Calibrated Accuracy
What's more, the Secondary Reference Series Thermistors are
accurate to ± 0.01°C and cover the temperature range of 0°C
to 100°C. They come 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.
No other sensors can match the accuracy and price
combination of these high-accuracy thermistor probes. Try
one and you'll agree. |
