Thermocouple with Process Thread and Lagging Extension – PPL5-T

Our PPL5-T thermocouple temperature sensor has a fixed male process connection ideal for direct installation into your process. The addition of a lagging extension allows the terminal head to sit above any lagging that may be fitted to the process. Alternatively, it can be specified as a cooling neck to provide protection to any electronics inside the terminal housing when used in applications with elevated temperatures.

Technical Details

Probe with Process Thread and Extension below Terminal Head
Fixed Male Process Thread plus Lagging Extension/Cooling Neck
Screw the Sensor directly into a Process or Thermowell
Terminal Head above Insulation / Electronics in Head Protected from elevated temperatures
Choice of Head Fittings and Thread Sizes
Sensor Type: Type J, K or T thermocouple
Operating Range: -50 to 250°C
Sheath Material: 316 stainless steel
Tolerance Band: BS EN 60584-2:1993 Class 1 or Class 2
Wiring System: Simplex or Duplex
Manufactured to your requirements
UKAS or Traceable Calibration Available

Prices from £70.00

Category: Thermocouple Sensors & Probes

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01628 778688 sales@processparameters.co.uk

Thermocouple Probe with Lagging Extension, Process Connection, Cooling Neck & Terminal Head

The PPL5-T thermocouple with lagging extension is suitable for the measurement of liquids and gases across a wide temperature range of -50 to 250°C.

All wetted parts of the thermowell lagging extension are normally made from 316 stainless steel and are TIG welded to give a pressure-tight housing for the sensor. Many metric and imperial probe diameters are available from 3mm upwards. Many thread types are available which are generally BSP, BSPT or NPT types but we can supply others to your requirements such as Metric, UNF etc.

We stock a variety of terminal heads that cover all eventualities for the thermocouple sensor. The most popular is the aluminium alloy KNE head which is commonly used in the industry.

We do however also offer other materials such as ABS, Nylon, FDA approved Polypropylene and of course 316 stainless steel for the most demanding applications. Most of our terminal heads have IP ratings of IP67 or IP68.

We can fit a number of options inside the terminal heads that best fit your requirements. The simplest is a terminal block allowing you to connect directly to the sensor. Alternatively, we can supply temperature transmitters with either a 4-20mA or a 0-10V output. Other options include intrinsically safe transmitters or those with HART protocol. We can also fit in head displays if required.

Additional Information About Thermocouple With Lagging Extension

The PPL5-T is ideal for direct installation into your process or for use with our PPL51-TW pocket. The temperature sensor is also available as a PPL5 resistance thermometer. We are also able to supply the thermocouple probe with your choice of thermistor sensor.

We offer a comprehensive calibration service and a wide choice of accessories for your thermocouple temperature sensor.

Our PPL5-T lagging extension thermocouple is made to order based on your application. If you’d like more information on any of our sensors, please contact us for a quote.

Call us at 01628 778788 or email sales@processparameters.co.uk.

Brand	Process Parameters
Sheath Material	316 Stainless steel

What is a Thermocouple Temperature Sensor?

A thermocouple temperature sensor is a device used to measure temperature based on the Seebeck effect. It consists of two dissimilar metals joined at one end (hot junction) and connected to a reference junction at the other. When there's a temperature difference between the junctions, an electromotive force (EMF) is generated, proportional to the temperature difference. Common types include type K (general-purpose, high temperature), type T (low temperature, high accuracy), and type J (general-purpose, low cost).

What is a Thermocouple Probe With Lagging Extension?

A thermocouple probe with a lagging extension is a type of thermocouple sensor where the hot junction is enclosed within a protective sheath or sleeve, often made of metal or ceramic. This lagging extension slows down the response time of the sensor, making it suitable for applications where rapid temperature changes might damage the thermocouple or introduce measurement errors.

What are Threaded Thermocouple Probes?

Threaded thermocouple probes are designed with a threaded end, allowing them to be easily inserted into or mounted on various structures or equipment. This makes them ideal for applications where precise positioning and secure attachment are required. Threaded probes can be made from different materials, such as stainless steel or Inconel, to suit specific temperature ranges and environmental conditions. They are commonly used in industrial settings, such as furnaces, kilns, and manufacturing processes.

How does a thermocouple work?

Thermocouples operate on the thermoelectric effect, utilising two dissimilar metal wires joined at a thermocouple junction. This junction, when exposed to a temperature gradient, generates a small voltage proportional to the thermal difference between the measurement point and cold junction.

Thermocouple wire pairs, often made of nickel, copper, or platinum, respond to temperature changes, enabling fast response in temperature measurement. Types like R, N, C, and B can measure very high temperatures. Cold junction compensation improves accuracy.

The exposed junction design offers quick response times, while the voltage output is interpreted by instrumentation for precise temperature readings. Thermocouples excel in vibration resistance and industrial use.

What applications are threaded thermocouple probes used for?

Threaded thermocouple probes find widespread use in general purpose industrial applications requiring secure installation and temperature measurement. They're employed in environments demanding chemical resistance and vibration resistance. These probes excel in monitoring very high temperatures in industrial processes, HVAC systems, and manufacturing.

Their threaded design allows for compression fittings, ensuring good thermal contact. They're often used alongside platinum resistance thermometers (RTDs) and infrared thermometers for comprehensive monitoring. Featuring connectors adhering to IEC standards, they easily integrate with instrumentation.

Threaded probes can withstand abrasion and offer options like exposed junctions for fast response. They're crucial in maintaining maximum continuous temperature limits in various industrial settings.