Model HRW


Refractory Thermowell

The Delta Controls Model HRW Refractory Thermowell is designed to protect the thermocouple’s primary thermowell from physical damage along with protecting the vessel nozzle and shell from the hot gas convection inside the reactor.

The HRW also prevents thermal shock damage to the primary thermowell by partially insulating it from sudden severe changes in gas temperature, such as during steam quenching. Several material formulations are offered. Each blend enhances various physical characteristics: mechanical strength, resistance to thermal shock, and the ability to withstand extremely high temperatures.

The HRW is placed at the base of the vessel nozzle and extends through the refractory lining borehole through the refractory lining in the base of the thermocouple nozzle on the Claus thermal reactor.


  • Protects thermocouple element well from thermal shock, flame impingement and steam quench
  • Formulated material blends provide enhanced resistance to corrosion, temperature, and thermal shock


  Model HRW1: Model HRW2: Model HRWZ:
Material: Mullite ceramic Alumina blend, re- crystallized Zirconia blend, yttria stabilized
Maximum Temperature: +2800 ºF
(+1538 ºC)
+3200 ºF
(+1760 ºC)
+4000 ºF
(+2204 ºC)
Maximum Insertion B: 35 in (889 mm) 35 in (889 mm) 35 in (889 mm)
Well Outside Diameter: 2.0 in (50.8mm) 2.0 in (50.8mm) 2.0 in (50.8mm)

Required Ordering Information

  • Detailed model number
  • Documentation & testing packages (if required, refer to Additional Resources in the product catalog)

Additional Information


Refractory Thermowell

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