Thermocouple Assemblies

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Take me to this assembly design...	Style MTA1 Transition to Lead wire	Style MTA2 Plug or Jack Termination	Style MTA3 Open Disc Termination
	Style MTA4 Stripped Cold End	Style MTA5 Connection Head	Style MTA6 Connection Head with 1/2" NPT Hex Nipple
	Style MTA7 Connection Head with 1/2" NPT Pipe Nipple	Style MTA8 Connection Head with 1/2" NPT Nipple, Union, Nipple	Style MTA9 Hand Held Probe
	Thermocouples with Transmitter and Connection Head

*Thermocouples*	Industrial Process	Base Metal	Noble Metal
		Thermocouple Insulators

Mineral Insulated, Industrial Process, Base Metal and Noble Metal Thermocouple Assemblies. Tempco manufacturers a wide variety of standard and custom designs for many diverse industries and applications including food processing, petrochemical, research laboratories, and semi conductors in temperature ranges from cryogenic -200ºC (-328ºF) to 2315ºC (4200ºF). When you have a special requirement or a difficult application, consult Tempco. Our team of professionals, with vast engineering and application knowledge, can assist you with specific solutions to your problem.

MI Cable Thermocouple Assemblies

All Tempco-Pak Thermocouple Assemblies are made from TEMPCO's high quality Tempco-Pak and will incorporate all the same outstanding features.

Important Features:
* Accurate
* High Temperature Rating
* Fast Response
* Moisture Proof
* Thermal Shock Resistant
* Can Be Formed
* Weldable
* High Pressure Rated
* Compact
* Durable

Typical Applications
> Heat Treating
> Furnaces
> Ovens
> Kilns
> Metal Processing
> Glass Manufacturing
> Food Processing
> Steam Generators
> Petrochemical
> Turbines
> Power Stations
> Diesel Engines
> Research Laboratories
> Refineries
> Oil Processing
> Bearing Temperature

Selecting the Correct Tempco-Pak Thermocouple Assembly

Thermocouples must be selected to meet the conditions of each particular application. The environment, operating temperature and atmosphere, response time and length of service must be considered when selecting the sheath, insulation, calibration, junction and termination of the thermocouple assembly. Refer to the Mineral Insulated Thermocouples and Cable section regarding sheath, insulation and calibration (see Metal Sheathed, Mineral Insulated Thermocouple Cable). TEMPCO's engineering staff will be happy to assist you with the design and selection of your thermocouple requirements.

Formability
Because Tempco-Pak is fully annealed it can normally be formed around a mandrel 4 times the sheath diameter. Consult TEMPCO if special forming is required.

Weldability
The thermocouple sheath can be brazed, soldered or welded. It is not recommended on diameters less than .093 in. All welding should be done in an inert atmosphere.

Assembly Tolerances:
Sheath Length Dimensions

Sheath O.D.	"L" Tolerance Up to 24"	"L" Tolerance Over 24"
.020 to .038	±1/2	±2%
.038 to .065	±3/8	±1-1/2%
.065 and up	±1/4	±1%

Flexible Lead Dimensions

Lead Length (ft.)	Tolerance
1 to 5	+6", -1"
5 to 10	+6", -2"
10 and over	+5%, -2%

Sheath Materials
The most commonly used sheath materials and their maximum continuous operating temperatures in an oxidizing atmosphere are as follows:

Sheath Material	Max. Operating Temperature
Alloy 600	2150ºF (1212ºC)
304 Stainless Steel	1650ºF (899ºC)
316 Stainless Steel	1650ºF (899ºC)
310 Stainless Steel	2000ºF (1150ºC)

For temperatures exceeding 2200ºF (1204ºC), Noble or Refractory metal sheaths are normally used.

Calibrations
The table shows the standard temperature ranges for the various ANSI thermocouple calibrations:

ANSI Letter	Thermocouple Type	Temperature Range
ANSI Letter	Thermocouple Type	ºF	(ºC)
J	Iron-Constantan	32-1400	(0-760)
K	CHROMEL P®-ALUMEL®	32-2300	(0-1260)
N	Nicrosil-Nisil	32-2300	(0-1260)
T	Copper-Constantan	32-700	(0-371)
E	CHROMEL P®-Constantan	32-1600	(0-871)
R	Pt 13% Rhodium-Platinum	32-2700	(0-1482)
S	Pt 10% Rhodium-Platinum	32-2700	(0-1482)
B	Pt 30% Rh-Pt 6% Rh	1472-3100	(800-1704)

Hot Junctions

(Hot or Measuring Junctions available on single or dual element cable.)

Choose the measuring junction that best suits your particular needs:

Exposed Junction (E)
Thermocouple wires are butt welded. Insulation is sealed against liquid or gas penetration prior to use.
This junction style provides the fastest possible response time but leaves the thermocouple wires unprotected against corrosive or mechanical damage.

Grounded Junction (G)
The sheath and thermocouple wires are welded together forming a completely sealed integral junction. Recommended in presence of liquids, moisture, gas or high pressure. The wire is protected from corrosive or erosive conditions. In the Grounded Junction, response time approaches that of the Exposed Junction.

Ungrounded Junction (U)
Thermocouple junction is fully insulated from welded sheath end. Excellent for applications where stray emf's would affect the reading and for frequent or rapid temperature cycling. With the Ungrounded Junction, response time is slightly longer than for the Grounded Junction.