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typeT Thermocouple Wire
Animal Rectal Probes
flexible Implantable Probes
Ultra-FineI Tseries Flexible Probe

Physitemp Type-T Thermocouple Probes

A wide range of Type-T Thermocouple (Copper Constantan) probes for all purposes.

Physitemp Type-T Thermocouple Probes

Needle Microprobes

Fast-response needle probes for instant readings in tissue, semisolids, liquids. Also for very small specimens, powders and materials. Needle tip is sealed to ensure only stainless steel contacts specimen. Max. temp. 200°C. 5 ft. lead. Smallest microprobes give fastest reading. Short probes are easier to insert and last longer. Type #'s indicate needle gauge and needle length in cm..-
Sizes Available (ga/cm.):

MT-29/1, MT-29/2, MT-29/3, MT-29/5
MT-26/2, MT-26/4, MT-26/6
MT-23/3, MT-23/5, MT-23/8

MT-4 - Similar to MT-29/1 but has blunt tip. Good for instant skin and surface temperatures, liquids. Time constant .025 secs. Not isolated.

ICT-4 - For use on integrated circuits and other micro specimens. 0.013" dia. straight stainless steel shaft; slightly protruding sensor bead to facilitate temperature probing. 5" tubular handle fits micro- manipulators. Max. Intermittent Temp. 200°C, continuous use 100°C, Time constant 0.25 secs. 5 ft. lead. Not Isolated.

MT-29/1B - Insect Probe - Similar to MT-29/1 but sensor is welded into tip for max. heat transfer. Designed for high accuracy on extremely small specimens such as insects, seeds, etc. Max. insertion depth 1/8". Time constant 0.015 secs. 5 ft. lead. Max. Temp. 150°C. Other sizes made to special order. Not Isolated.

All above probes are non-isolated. Isolated versions of 23 ga. and larger needles are available for special order.

Type           Dia.               Time Constant
MT-23           23 ga. (.125")           .15 secs.
MT-26           26 ga. (.018")           .1 secs.
MT-29           29 ga. (.013")           .125 secs.

Flexible Implantable Probes

IT Series. Implantable in semi-solids and tissue with needle (supplied). Also for immersion in various solutions and rectal temperatures of small animals. Totally sheathed in chemical resistant Teflon. Quite rugged. Max Temp. 150°C. Isolated. Type # designates needle gauge. (Or one gauge smaller in thin wall).

IT-23 - For ultra fast measurements and for use on micro-size specimens. Sensor lead only 0.009" dia. Tissue implantable with 23ga. needle (supplied). Rather fragile. Max. temp. 150°C. Time constant 0.005 secs. 3 ft. lead. Teflon coated. Isolated.

IT-1E - As IT-18 but sensor bead exposed. Combines the ultra-fast response of IT-23 with the Teflon sheath strength of IT-18. Time constant .005 secs. Isolated.

Type           Dia.           Time Constant           Lead Length
IT-14           .050"           0.3 secs.                     3 ft.
IT-18           .025"           0.1 secs.                     3 ft.
IT-21           .016"           0.08 secs.                   1 ft.

Ultra Fine IT-Series Flexible Microprobe

IT-24P - Tiny, 24 gauge polyurethane coated wire with polyester insulated thermocouple bead.

For research applications to measure temperature in animal brains and other tissue. Fairly fragile, but very fast responding. Wire cross section .005” x .0025” Insulated tip maximum outside diameter .009”.

Length 36” supplied on 1” diameter protective spool as shown.
Time constant .004 seconds. Maximum temperature 70°C. Sterilization by Gas (ETO).

Type           Dia.           Time Constant           Lead Length
IT-24P        .009"           0.004 secs.                    3 ft.

General Purpose Probes

HT-1 - "Workhorse" probe for liquids, gases, semi-solids. Plastic handle with straight stainless steel shaft. Not good for surface temps. Max. Temp. 400°C. Time constant 0.5 secs. 5 ft. lead. Not Isolated.
HT-2 - As HT-1 but with 9" shaft.

BT-1 - For surface temperatures of solids, also for liquids, gases and semi-solids. Probably our best general purpose probe. Welded stainless steel shaft, plastic handle. Tip is .02" diameter bent at right angle to probe to facilitate accurate surface measurement. 5 ft. lead. Immersible. Max. Tip Temp. 240°C. Time constant 0.15 secs. Not Isolated.

DPT Series- Immersion probes for liquids. #304 stainless steel welded shaft, wooden handle. 5 ft. lead. Max. Temp. 400°C (750°F). Time constant 2 secs. Not Isolated.

TFT Series - Immersion probes for corrosive liquids. Similar to DPT series but shaft is Teflon coated. Max. Temp. 150°C (300°F). Time constant 3 secs. Isolated. 5 ft. lead.

PT-6 - Sensor Six-Pack. For multi-point measurements. Inexpensive, flexible, welded sensor beads, tough Kapton insulation, 5 ft. leads. Max. Temp. 400° C. Time constant 0.01 secs. Per package of six. Not Isolated.

PIT-12 - For permanent installation. 12" lnconel shaft 1/8" dia. Can be formed to fit inside or outside any dia. pipe. Complete with 1/8" NPT compression fitting. 10 ft. leads and quick-disconnect plugs and sockets. Max. Temp. 400°C (750° F). Time constant 3 secs. Not Isolated.
PIT-6 - Has 6" stainless steel shaft; otherwise as PIT-12.

GT-1 - Air and gas probe. 24" #304 stainless steel shaft, wooden handle. 5 ft. leads. For instant readings of temperature gradients in environmental chambers, freezer boxes, etc. Max. Temp. 200°C. Min. Temp. -200°C. Isolated.

DPT Specifications
Type           Shaft
DPT-12           12"
DPT-24           24"
DPT-35           36"

TFT Specifications
Type           Shaft
TFT-12           12"
TFT-24           24"
TFT-36           36"

Clinical Probes

RET-1 - Rectal probe for humans, neonatal, rabbits, and larger animals. Flexible, vinyl covered, soft tipped. Does not cause discomfort. Max. Temp. 90°C. Time constant 5.0 secs. 5 ft. lead. Isolated.

OT-1 - For fast reading oral use. Ball-tipped stainless steel shaft, stainless handle. 5 ft. lead. Max. Temp. 125°C. Time constant 0.8 secs. Not Isolated.

DSP-1 - Disposable sheaths for use with OT-1 and RET-1, per 1000.

SST-1 - Skin surface probe, to be taped on. 1/4" dia. 10 Kt. gold sensor disc, 5 ft. lead. Max. Temp. 90°C. Time constant 0.15 secs. Not Isolated.

SST-2 - as SST-1 with plastic handle. Isolated.

ESO-1 - Esophageal probe. Flexible vinyl covered 1/8" dia. Max. Temp. 90° C. Time constant 5.0 secs. 5 ft. lead. Isolated.

Animal Rectal Probes

RET-2 - Rectal probe for rats. For fast intermittent measurements. Smooth ball tip. Stainless steel shaft - 1 " long, 0.059" dia., tip dia. .125". 5 ft. lead. Max Temp. 125°C. Time constant 0.8 secs. Not Isolated.

RET-3 - Rectal probe for mice, etc. As RET-2, with shaft 3/4" long. .028" dia. Tip diameter .065". Time constant 0.5 secs. Not Isolated.


The new RET-2-ISO for rats has all the same features of the RET-2 plus:

* an isolated sensor (can be used with montoring equipment where electrical interference from other electrodes may be present).
* Reinforced strain relief for applications where probe is in more frequent use. Smooth ball tip. Stainless steel shaft - 1” long, .059” dia. Tip diameter .125”. 5 foot lead length. Time constant 0.8 secs.


The new RET-3-ISO for mice and neonatal rats has all the same features of the RET-3 plus:

* an isolated sensor (can be used with montoring equipment where electrical interference from other electrodes may be present).
* Reinforced strain relief for applications where probe is in more frequent use.
* Smooth ball tip. Stainless steel - 3/4” long, .028” dia. Tip diameter .065”. 5 foot lead length. Time constant 0.5 secs.


The new RET-4 Rectal probe for very small animals (neonatal mice). Flexible polyurethane sheath with smooth rounded tip (see inset). 36” long (can be made longer). Outside diameter nominal 0.032” (max at tip 0.04”). Time constant 0.18 seconds. Max temp. 140°C. May be sterilized by Gas (ETO), Gluteraldehyde solution or autoclave.


Teflon sheathed thermocouple wires are implanted with regular hypodermic needle. 14ga. or 17ga.
When ordering, specify: Probe series (IT), needle gauge, number sensors and distance between sensors.
(e.g.: IT-17(3) is implanted with 17 ga needle and has 3 sensors. Unless otherwise specified we put sensors 1cm apart, starting at tip.)

MT Series Needle Microprobes

These stainless steel microprobes have closed, sharpened tips. We can put up to 3 sensors in a 23ga needle and 1 or 2 sensors in a 26ga needle.

When ordering, specify: Probe series (MT), needle gauge, needle length, number of sensors and distance between sensors in cm.  e.g. MT-23/5(2) is a 23ga needle, 5 cm needle, 5cm long with 2sensors. Unless otherwise specified sensorswill be 1cm apart, starting at tip.

Physitemp also manufacture interchangeable single sensor probes and microprobes available in many configurations. Our thermocouple probes include clinical probes-skin, rectal, oral and esophageal. There are implantable needle and flexible sensors and probes for measuring surfaces, liquid and air. See our data sheet on interchangeable probes and sensors for more descriptive information on individual probes.

Type T Thermocouple Wire

0.1°C accuracy in the following sizes: 30ga, 36ga, 40ga, 44ga

Most thermocouple wire used in the manufacture of sensors is "Special Limits" wire which, to meet NIST standards, must be accurate to 0.5°C in the range 0-50°C. This means that even with most sophisticated electronics, the best possible accuracy for the system is 0.5°C.

Physitemp wire is tested to stringent standards and is guaranteed accurate to 0.1°C i n the range 0-50°C. It is therefore five times more accurate than regular "Special Limits" wire. It is intended for applications where high accuracy is essential but where the low cost of thermocouples is important.

We can supply this wire in rolls of 50' or in larger quantities. We will also weld thermocouples and provide custom sheaths if required.