Thermometrics NTC Thermistors

Thermometrics HTP Series of NTC Type High Temperature Probes consists of a bead thermistor hermetically-sealed in the tip of a shock resistant glass rod. These units are rugged and unaffected by severe environmental exposures, including high density nuclear radiation.All HTP Series High Temperature Probes are aged at 842°F (450°C) for extended periods of time. As such, they exhibit excellent stability for all temperatures at or below 842°F (450°C). Intermittent operations at temperatures up to 1112°F (600°C) are permissible. When additional preconditioning is specified,compliance with the performance requirements of MIL-PRF-23648 can be guaranteed.

Application

Temperature measurement and control
Temperature compensation
Controlled temperature soldering stations
Process oven control

Features

Rugged and unaffected by severe environmental exposures
Excellent stability for all temperatures at or below 842°F (450°C)

Specifications & Properties

Thermistor Series: HTP60 / HTP65 / HTP85 / HTP100

Parameter		HTP60	HTP65	HTP85	HTP100
Probe Length	Max Diameter	0.060 in (1.5 mm)	0.065 in (1.7 mm)	0.085 in (2.2 mm)	0.100 in (2.5 mm)
	Standard Length Code “B”	0.250 in (6.3 mm)	0.250 in (6.3 mm)	0.250 in (6.3 mm)	0.250 in (6.3 mm)
	Length Codes Available (special orders only)	“A”, “B”, “D”	“A”, “B”, “D”	“A”, “B”, “D”	“A”, “B”, “D”
Lead Wires	Nominal Diameter	0.008 in (0.20 mm)	0.008 in (0.20 mm)	0.008 in (0.20 mm)	0.008 in (0.20 mm)
	Min Lead Length	0.250 in (6.3 mm)	0.250 in (6.3 mm)	0.250 in (6.3 mm)	0.250 in (6.3 mm)
	Lead Material	Platinum Alloy	Platinum Alloy	Platinum Alloy	Platinum Alloy
Thermal Time Constant	Still Air @ 25°C (77°F)	12 sec	13 sec	16 sec	22 sec
Dissipation Constant	Still Air @ 25°C (77°F)	0.60 mW/°C	0.65 mW/°C	0.80 mW/°C	1.0 mW/°C
Resistance Range at 257°F (125°C)	Range (Ω)	100 k to 2 M	100 k to 2 M	100 k to 2 M	100 k to 2 M
Resistance Range at 257°F (125°C)	Max Power Rating	0.060 Watts	0.065 Watts	0.075 Watts	0.100 Watts

Resistance vs. Temperature Ratio (RT/R125)

Temp °F (°C)	RT/R125	Temp °F (°C)	RT/R125
257 (125)	1.00000	572 (300)	0.00793
302 (150)	0.41087	617 (325)	0.00487
347 (175)	0.18272	662 (350)	0.00310
392 (200)	0.08720	707 (375)	0.00203
437 (225)	0.04430	725 (400)	0.00138
482 (250)	0.02380	797 (425)	0.00096
527 (275)	0.01344	842 (450)	0.00068