NTC Type HTP Series High Temperature Probes Applications Description • Temperature measurement and control The NTC Type HTP Series high temperature probe 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. • Temperature compensation • Controlled temperature soldering stations • Process oven control A rugged high temperature bead thermistor (Type HTBR55) is available on special order Data All NTC Type 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) is permissible. When additional preconditioning is specified, compliance with the performance requirements of MIL-PRF-23648 can be guaranteed. Amphenol Advanced Sensors Type HTP Series Specifications Thermal and Electrical Properties The following table lists the thermal and electrical properties for all high temperature probes. All definitions and test methods are per MIL-PRF-23648. NTC Type HTP Series dimensions Table A Probe Length Options Thermistor Type HTP60 HTP65 HTP85 HTP100 Maximum 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 order only) “A”, “C”, “D” “A”, “C”, “D” “A”, “C”, “D” “A”, “C”, “D” 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) Minimum 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 12 seconds 13 seconds 16 seconds 22 seconds 0.60 mW/°C 0.65 mW/°C 0.80 mW/°C 1.0 mW/°C Lead-Wires Thermal Time Constant Still Air at 77°F (25°C) Dissipation Constant Still Air at 77°F (25°C) Resistance Range at 257°F (125°C) ohms (S) Maximum Power 100 k to 2 M 100 k to 2 M 100 k to 2 M 100 k to 2 M Rating 0.060 Watts 0.065 Watts 0.075 Watts 0.100 Watts Data Table B 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 Type HTP Series Specifications Ordering Information The code number to be ordered may be specified as follows: HTP High Temperature Probe Code 60 65 85 100 Diameter 60 mils 65 mils 85 mils 100 mils Code A B D Probe Length* 0.125 in (3.17 mm) 0.25 in (6.35 mm) standard 0.5 in (12.7 mm) Code D Material System -Code Resistance RT @ 257°F (125°C)** 514 510 kS 754 750 kS 105 1.0 MS 155 1.5 MS Code F G J K L M N P Q R S HTP - ____ - ____ - ____ - ____ - ____ Tolerance*** 1 2 5 10 15 20 25 30 40 50 Non-standard (consult factory) Typical model number *The nominal standard value for the zero-power resistance at 257°F (125°C). **The zero-power resistance at 77°F (25°C), expressed in Ω, is identified by a three digit code number. The first two digits represent significant figures, and the last digit specifies the number of zeros to follow. Example: 0.06 in (1.5 mm) maximum diameter x 1/4 in (6.35 mm) long glass probe with a zero-power resistance at 257°F (125°C) of 510 k and a tolerance of ±20% would be specified as HTP60BD514M. ***Special tolerances are available on request . Consult the factory for special resistance tolerances, non-standard resistances and/or non-standard temperatures. Amphenol Advanced Sensors www.amphenol-sensors.com © 2014 Amphenol Corporation. All Rights Reserved. Specifications are subject to change without notice. Other company names and product names used in this document are the registered trademarks or trademarks of their respective owners. AAS-920-268A-04/2014