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Thermocouples - Explanations

With connector

Mineraloxide insulated metal sheathed thermocouples (MIMS) can easily be provided with different termination connectors. There are mountable connectors available of standard size as well as miniature size. Normally male plugs are used but on request we mount female ones. See Cables and Connectors. Thermocouples kept in store are usually supplied with moulded connectors of standard size which are completely sealed and most securely fixed to the probe.

The probes can also be ordered without connectors for later mounting on site.

The category "With connector" can also be supplied with angled probes and/or supporting tube. The supporting tube makes a thin metal sheathed thermocouple probe stronger without loss of response time. The feature is advanteous in case of heavy flowstreams and when compression fittings are used.

With cable

Metal sheathed thermocouple probes can be terminated by joining an extension cable in a transition junction. Probe and cable can not be parted. The transistion junction is made of stanless steel and is available in three sizes to suit the diameters of probe and cable as well as holes on the way to the measuring position. The diameters of the junctions are 10 mm (standard), 7 mm (miniature) and 4 mm (subminiture). See section Cables and Connectors.

Like connector terminated probes the cable terminated types can be supplied with supporting tube and be angled on request.

The extension cable can be terminated with connectors or just with flying leads.

Process sensor

Thermocouple process sensors are usually characterized by signal connection in terminal heads and process connection by threads, flanges or similar. Inside the housing there is a fixed or replaceable insertion probe terminated by a terminal block, a transmitter or in certain cases flying leads for later choice of signal treatment. Different models of terminal heads are shown in pdf datasheets under this button.

Pentronic keeps in stock process sensors for high temperatures with protection tubes of alloys meeting those requirements or ceramic tubing for noble metal thermocouples. Examples of use are high temperature furnaces for heat treatments and combustion furnaces. Moreover there is a selection thermocouple process sensors as alternative to Pt100 sensors in measurement environments with heavy vibrations and shocks.

Spring loaded

Spring loaded thermocouples normally are used to measure the bottom temperature of drilled holes, e g when moulding plastics or other melting media. A bayonet adaptor is threaded into the opening of the hole and the spring loaded bayonet cap can easily be turned to fix the sensor to the adaptor. The force of the spring secures the sensor tip to be in contact with the bottom of the hole.

Spring loaded sensors are available in designs with thermocouple wires drawn to the tip and grounded there. There are also tips with metal sheathed thermocouples making isolated measuring junctions possible. The wires can be supplied with or without protection armouring, i e flexible hose of stainless steel.

There are designs for fixed or continuously adjustable insertion lengths as well as straight and angled probe configurations.

Thermocouple wire

Using plain thermocouple wire is a simple way of measuring low temperatures in laboratories and for testings. Thin wires gives you very short response times. Thin wires are also suitable for surface temperature measurements on e g metallic tubes. If the thermocouple is positioned inbetween good insulation and the tube surface you will measure temperatures very close to the flow temperature inside the tube. With no insulation you will measure the temperature of the surface.

In order to check temperatures at transportations of food it is advantageous to position the thermocouple wire inbetween two stacked cartons to have a quick reading.

Handheld thermocouples

Pentronic markets a number of handheld temperature indicators, see Hand indicators. To those with sensor input for miniature male connector we here present some different sensor models.

Metal sheathed (MIMS) probes can very well be used in air and liquids and can with caution be used to penetrate soft and porous materials like powders.

Cannula tips are manufactured on tubular probes. Thus these can be used to penetrate materials giving more resistance like meat and plastic pakages, cartons, soil etc.

Surface temperature probes are intended for surfaces but can naturally be used in air. Liquids should be avoided.

Air temperature probes are only intended for air and non-aggressive gases.

Engine sensors

The headline Engine sensors covers a selection of temperature sensors suited to piston engines ranging from small power sizes within the automotive and truck industries up to high power ones for power generation and ship propulsion. Typical objects for temperature measurments are water, oils, cylinder lining, valves and exhaust.

For ship usage sensors are available with type approvals from the common classification societies.