Download the Model HTP
Detailed Datasheet 
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Features
Why HTP?
For a detailed discussion of how the Model HTP solves the problems involved with temperature sensing in Claus Thermal reactors, click here.
Application
The Type HTP Thermocouple is designed to measure high temperatures under the extremely severe conditions of a Claus Thermal Reactor. The atmospheres to be measured may contain hydrogen, sulfur, sulfur oxides, chlorides, acid gases, etc. Operating temperatures may be in excess of 3000°F and under pressure. Normal operating vibration will not cause sensor failure.
The most common application is to protect the refractory in Claus thermal reactors and sulfur burners in sulfur acid plants. Other applications include hydrogen burner systems, water gas generators, coal gassifiers and various kinds of POX units.
The design of the Model HTP was a result of careful attention to design detail, 30 years of experience, and many field installations. Materials used in the HTP are critical. For example, the ceramic parts exposed to the process are various blends of alumina, zirconia, MgO, and other materials. All conceivable care is taken during the application and fabrication of these units. The long service life and reliable operation of the HTP thermocouple sensor is a result of attention to detail.Overview
The Delta Controls Model HTP was designed for the primary purpose of reliably protecting a vessel and its refractory lining from excessive temperatures. The HTP also significantly extends thermocouple reliability in extremely rough service such as 3000°F (1650°C) in acid gas environments. The HTP design provides the best "up time" for plant operations and the lowest cost of temperature sensor ownership.
This superior result is achieved by the mechanical design of the HTP which is the result of 30 years of evolutionary improvement. The thermocouple junction is maintained in a protected environment that subjects it only to the heat of the refractory. The thermocouple junction is isolated from the corrosive and invasive gases by using a constant very low flow flush gas circulating past the junction. The flush gas is kept at a pressure somewhat higher than the maximum reaction vessel pressure to mitigate the migration of vessel gases through the primary well, body or seals. Any process gases that do enter are carried away by the flush gas. The flush gas flow has an insignificant effect on the accuracy of the temperature measurement.
All Delta HTP's are built to meet each customer's specific installation requirements, such as; thermocouple type, dryout temperatures, nozzle size, insertion length, hazardous area class 1 reaction and materials of construction. The HTP assembly is furnished complete with all necessary installation components including a refractory mandrel and nozzle insulation. The mandrel provides the user with a convenient means to accurately produce the refractory aperture in the correct size and alignment needed by the HTP refractory well and thermocouple assembly. Nozzle insulation materials are made to meet the exact nozzle installation needs and dimensions.
The HTP can be economically and reliably repaired, extending the useful life of the thermocouple unit. Detailed manuals and instructions are provided by Delta Controls.
Accessories Used With the Model HTP Thermocouple |
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| Model HRW Refractory Well |  |
The Delta Controls Model HRW refractory well is placed in a hole through the refractory lining of a Claus Thermal Reactor or other reaction vessel. The HRW protects the thermocouple element protective well from physical damage, and protects the reactor nozzle and shell from the hot gases inside the reactor. |
| Model HNP Nozzle Insulation Kit |
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Over 30 Years of experience has taught Delta Controls the best combination of materials to use to protect the nozzle and shell from overheating. All of the needed insulation, of the correct sizes and types, together with an illustrated installation instruction drawing are furnished in a single package. This ready to use kit is made up for a specific nozzle size and height. It is also tagged with the model, size, and jobsite identification numbers. This kit method has proven to be economical, convenient, and helpful in insuring good results. |
| Model HFS Purge Gas Flush Control Station |  |
The Model HFS flush station maintains the pressure inside the thermocouple body above the maximum reactor pressure. It also accurately controls the flush gas flow rate thru the thermocouple sensor . This constant flush sweeps any penetrating gas molecules out of the thermocouple sensor before corrosion damage occurs and without artificially cooling the thermocouple element. |
Installation ToolsImproper installation is the most common cause of premature thermocouple failure. These tools will allow for the creation of a centered, accurate hole through the refractory liner so that the refractory protective well will be correctly located in relation to the mounting flange.
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| Model H6G Refractory Drilling System |  |
The Delta Controls Model H6G is used to drill straight, centered holes through Claus thermal reactor refractory linings. Hand-held positioning of a core drill bit during drilling is unacceptable and will not produce a hole usable for the HTP thermocouple. The HRG guide is rigidly mounted on the vessel nozzle flange and works to keep the core drill bit concentric with the nozzle while the well hole is being drilled through the refractory liner. The final result is a straight hole which is properly positioned to accept the refractory well and the thermocouple.
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| Model HRS Refractory Stop |  |
The Model HRS Refractory Stop is used to prevent refractory castable or mortar from entering the mounting nozzle during lining of the reactor. After the refractory has cured, the HRM is removed and the refractory is drilled using the HRG drilling system. |
| Model HRM Refractory Mandrel |  |
The Model HRM refractory mandrel is installed on the thermocouple nozzle prior to installation of the refractory material. It creates a centered, accurate hole through the refractory liner, and keeps refractory and mortar out of the nozzle interior. This is required so that the refractory protective well will be correctly located in relation to the mounting flange. The HRM is used to create the refractory hole when drilling is undesirable, such as when water (for drilling) may not be used. Many refractory installers prefer to use the HRG drilling system rather than mounting the HRM, which requires cutting and fitting firebrick around the mandrel pipe. |
Installation Information
Instruction
Manual - Model HTP Thermocouple
htxinstall.mpg
- Installation Illustration video for Model HTP / HTX (25MB file)
nozzleinstall
- Video Illustrating Nozzle Installation (realmedia
1.2Mb) (WMV 2.2Mb) (MPG
9.6Mb)
Reference Material:
Design
Rationale for Delta Controls Thermocouples - a detailed discussion of how
the Model HTP solves the problems involved with temperature sensing in Claus
Thermal Reactors.
Measuring Temperature Using Thermocouples - Includes links to thermocouple
milllivolt reference tables
Improved Temperature Measurement - article reprint
from Sulphur magazine - January-February 2005
Reliability
of Claus Temperature Measurements;: Published Paper; Presented at the Sulfur
2001 International Conference, Marrakech, Morocco
Effect of Purge
Flow Rate on Thermocouple Measurements
- Application Note
HTP Detailed Data Sheets
Model HTP
Datasheet in pdf format
AN-HTP16 Model HTP Maximum Security Option Acid Gas Thermocouple
00-HTP05 Model HTP Application Data Sheet -
use this form to request a quote or get further information
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