Maltec-T ST-34A – Immersion Probe

Maltec-T ST-34A – Immersion probe comes highly recommended for various immersion applications, ideal for accurately measuring the temperature of water, oils, non-corrosive fluids, and gels. It serves as a versatile temperature probe suitable for general-purpose use as well. Its thermocouple junction is safeguarded by an Inconel sheath from tip to handle. Compatible with any temperature-measuring instrument designed for type K thermocouples and equipped with a miniature connector input, the ST-34A ensures reliable temperature readings.

How Thermocouple Probe Works?

Thermocouple probes function by utilizing the generation of an electromagnetic force (emf) when heat is applied to the junction of two different metals, known as the sensing junctions. At the opposite end of the wires, typically integrated into the input instrument, lies another junction known as the reference junction. The temperature is deduced by analyzing the emf variance between the sensing and reference junctions, where the latter is maintained at a known temperature. Types of thermocouple probe junctions encompass exposed, ungrounded, and grounded configurations.

Thermocouple Probe Junction Types

Sheaths with small diameters have faster response times; sheaths with larger diameters have longer life and are better for measuring higher temperatures.

Exposed Junction has the fastest response time, ideal for measuring rapid temperature changes. Clear coating on most models provides a humidity barrier for the thermocouple. Do not use with corrosive fluids or atmospheres.

Ungrounded Junction has a welded junction insulated from the protective sheath and is electrically isolated. Longer response time; use for conductive solutions or where isolation of the measuring circuitry is required.

Grounded Junction has a junction welded to tip of sheath. Wires are completely sealed from contaminants. Good response time.

Probe Sheath/Body Materials

• Inconel 600 Sheath is ideal for harshly corrosive surroundings and high temperatures, effectively combating gradual oxidation. It maintains stability up to a maximum continuous operating temperature of 1148°C (2100°F) and intermittent temperatures of 1371°C (2500°F).
• 304 SS Sheath is versatile, offering corrosion resistance suitable for a variety of applications, including food service and biological contexts. It can withstand temperatures up to 898°C (1650°F) continuously and 1398°C (2550°F) intermittently.
• 316 SS Sheath offers superior corrosion resistance compared to 304 stainless steel. It can withstand certain potent acids and has a maximum continuous operating temperature of 898°C (1650°F) and an intermittent operating temperature of 1371°C (2500°F).
• SS Sheath with Coating of PTFE or PFA with grounded junction is ideal with corrosive liquids and atmospheres. Longer response time. Temperatures to 260°C (500°F).
• Polymer Body Probes come in various materials such as Kapton and PTFE, offering exceptional flexibility and often strong chemical resistance. Ensure to refer to a chemical compatibility chart when choosing a probe for your specific application.

Types of Thermocouple Probes

Dpstar’s range of hand-held thermocouple probes are designed for: immersion, in a liquid; surface, placed in contact; insertion, into a solid; air or within an airflow.

• Immersion probes, used in liquids or semi-solids and have a flat or rounded tip.
• Insertion probes are used to pierce solids and are often used within the food industry and have a pointed spear tip.
• Contact probes are used to monitor surface temperatures and have a sprung-loaded or bulbous ribbon head.
• Air probes are used to monitor air temperatures in ducting or flues in ducting or flues and often come with an exposed junction, which aids response time.

Applications

• Temperature measurement of air and non-corrosive fluids and gels.
• General-purpose temperature applications in laboratories, foodservice, and industrial applications.

Dpstar is a professional thermocouple supplier in Malaysia. We offer a wide range of handheld thermocouple probes to suit a variety of applications. They are perfect for easy handling, quick use temperature measurement. A thermocouple probe consists of thermocouple wire housed inside a metallic tube. The wall of the tube is referred to as the sheath of the probe. Common sheath materials include stainless steel and Inconel. Inconel supports higher temperature ranges than stainless steel, however, stainless steel is often preferred because of its broad chemical compatibility. For very high temperatures, other sheath materials are also available. Thermocouple sensor probes come in various styles unique to different applications. Each style consists of a thermocouple sensing junction protected by a sheath with a termination option.