Model HRC


Process Camera, Sulfur Processing Service

The Delta Controls Model HRC Process Camera is designed for the primary purpose of reliably monitoring the interior of a Claus thermal reactor. Model HRC  is intended for either short term online inspections or continuous monitoring. HRC’s design and suitability for the thermal reactor is the result of attention to detail and more than 50 years of experience in the sulfur recovery industry. The camera probe places the camera and lens directly at the refractory hot face, allowing for a wide-angle view of critical vessel components such as the burner, refractory, and tubesheet.

The camera is designed to be inserted through an isolation valve while a vessel is online and can either be left inserted indefinitely or used temporarily for an inspection. A flanged seal assembly incorporates multiple redundant seals so that the camera inserts and retracts without process leakage. A nitrogen supply applies positive back pressure to the seals. In the event a seal is compromised, the nitrogen flows through the damaged seal and into the reactor. An inline flow meter would indicate the flow and that a seal has been compromised. This system prevents any process gases leakage and serves as an indicator of seal integrity.

The patent pending thermal regulation system uses water circulated through a series of channels to accurately regulate the probe’s temperature between the sulfur dew point corrosion and high temperature sulfidation limits. It also maintains the camera circuitry within its operating temperature in addition preventing lens occlusion by maintaining the lens temperature above sulfur’s freezing point.

The camera utilizes an pneumatically driven system that actuates the camera in and out of the vessel. Failsafe features optimize the camera for long-term operation. The camera automatically orders its own retraction for a number of fault conditions such as loss of coolant, high camera temperature, loss of power or loss of instrument air. The extraction assembly contains an onboard air tank to safely remove the camera in case air supply is lost.


  • Only process camera designed for sulfur processing services
  • Patent pending thermal regulation system
  • Identify operational issues before onset of damage or equipment failure
  • Monitor integrity of critical vessel components
  • Reduce vessel downtime by minimizing turnaround discovery inspections
  • Pneumatic extraction failsafe system increases reliability for continuous use


  • Power: 24 VDC at 2 A
  • Actuator Air: 60 psig to 100 psig supply required
  • Coolant: Water at 0.5 gpm (continuous supply required)
  • Body Material: Stainless steel
  • Trim, Bolting, Seats: Stainless steel, aluminum, Aflas®
  • Housing Material: Aluminum or 316 Stainless Steel
  • Flange Material: 316L Stainless Steel
  • Auto-retraction & Insertion Unit Material: Aluminum, 316 Stainless Steel
  • Process Connection: 3.0 in to 6.0 in RF flange (other sizes, types, ratings available)
  • Communication: Cat5 Ethernet or Wi-Fi
  • Working Pressure: 150 psig (10.3 bar) at 500 °F (260 °C)
  • Working Temperature: -4 °F to +3092 °F (-20 °C to +1700 °C) ¹
  • Required Accessories: Model HFI Flush Gas Station
  • Required Accessories:
    Model HFI Flush Gas Station
  • Optional Accessories:
    Model TCP Nozzle Obstruction Tool
    Field Training, Consultation and Assistance

Certifications & Approvals

  • Housing Third Party Listed by CSA NRTL/C (USA and Canada) Class I, Groups B, C and D; Class II, Groups E, F and G; Class III; Encl 4X

Required Ordering Information

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

Additional Information


Process Camera, Sulfur Processing Service

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Example Applications