Thermocouples

Parr offers a variety of thermocouples for use in these reactors and pressure vessels. The “standard” thermocouple is a Type J (iron-constantan) which is well suited to the operating temperature range of these vessels. Other materials as well as platinum resistance (RTD) elements are available as special orders. These thermocouples are sealed in 1/8″ diameter stainless steel sheaths and have a standard plug connection at the end of the probe.

These thermocouple assemblies can either be sealed directly into the head of the vessel using a male connector with an 1/8″ NPT thread or inserted into a protective well. Thermowells are used on larger vessels to protect the thermocouple from physical damage and on all vessels of a corrosion resistant alloy other than stainless steel.

Dual element thermocouples with two separate thermocouples in a single sheath and spring loaded thermocouples designed to be installed thru the heater to the outside wall of the vessel are also available.

Thermocouples should be approximately four inches longer than the depth of the vessel so that a smooth bend can be made at the top to clear other head fittings.

The A470E2 Extension Wire is used to connect from the thermocouple to the control or readout device. The standard length is six feet, but longer lengths are available.