Redy Wireless Thermocouple Sensor

Quick Answer: The Redy wireless thermocouple sensor measures temperature with a thermocouple, a junction of two different metals that produces a small voltage depending on temperature, and sends readings wirelessly for logging. A wireless thermocouple sensor is chosen for temperatures too high for ordinary laboratory probes, such as flames.

How a Thermocouple Reads Temperature

Join two wires of different metals at one end, and a small voltage appears between their free ends whenever the junction sits at a different temperature from them. This is the Seebeck effect. The sensor’s electronics measure that voltage, allow for the temperature of their own connection, and convert the result to degrees. Because the sensing junction can be a tiny bead of wire, a thermocouple heats and cools quickly and can be held inside a flame.

That makes it the sensor for the hottest school practicals: comparing zones of a Bunsen flame, following a hot plate as it heats, or recording a heated metal as it cools. The thermocouple type, maximum temperature and probe sheath are not stated in the title, and the usable range depends on both the wire and the sheath, so establish them before the probe goes near a flame.

For everyday liquids and air, where finer resolution helps, the wireless thermometer sensor is often the more suitable choice.

Applications

• Mapping the temperature of different zones in a Bunsen flame
• Logging the heating curve of a hot plate or sand bath
• Cooling curves of heated metal samples
• Temperatures in ice and salt mixtures or dry ice, if the range allows

Specifications

Care & Handling

• Keep the transmitter well away from the flame or heat source; only the probe tip should be heated.
• Avoid sharp bends at the junction and along the wire.
• Let the probe cool on a heat-proof mat before handling or packing it away.
• Inspect the tip for corrosion or damaged insulation after flame use.

Why Choose LabEquip

Chemistry and physics teachers who need temperatures beyond ordinary probes, and college labs running combustion and heat practicals, buy thermocouple sensors. This one is included in LabEquip’s chemistry lab equipment range; to ask about thermocouple type and probe length, use the contact page.

Frequently Asked Questions

What is a thermocouple?

It is a temperature sensor made from two wires of different metals joined at one end. The junction produces a small voltage that changes with temperature, which the electronics convert into a reading.

Why use a thermocouple instead of an ordinary temperature probe?

Thermocouples can generally reach much higher temperatures and respond quickly because the junction is small. Ordinary probes usually give finer resolution over the moderate range used for liquids.

Can the probe be put in a Bunsen flame?

Thermocouples are commonly used for flame temperatures, but the limit depends on the wire type and the sheath. Check the stated maximum first, and keep the transmitter and lead well away from the flame.

Why do different parts of the flame give different readings?

A Bunsen flame has zones of incomplete and complete combustion. The hottest region is usually just above the tip of the inner blue cone, and the junction must be held steady to compare zones fairly.

Why does the reading fluctuate in a flame?

Flames flicker and move, and the small junction responds quickly to every change. Shield the flame from draughts and average the readings over a short time.

How should the thermocouple be cleaned?

Let it cool completely, then wipe off soot or residue with a soft cloth. Do not scrape or bend the junction, as this can break it or shift the reading.

Last Updated: September 2026