Description

“Caloritech CXF Series Screwplug Immersion Heaters are used primarily for oil heating and have steel screwplugs. Low-watt density heaters are used in heavier, non-circulated oils. Higher watt density heaters are suitable for light oils or in forced oil circulation loops. Incoloy elements are silver brazed into a steel screwplug. Heaters are available with factory-installed thermostats to control the liquid temperatures. These heaters are designed to be fully immersed in liquid at all times. Application – Screwplug heaters are primarily used to heat liquids in tanks or vessels. To do so safely and reliably requires that the heating elements remain fully immersed in the liquid. Liquids such as water, oils, trichloroethylene, etc. can be heated through natural convection currents created by the immersed elements. Although electricity costs are generally higher than gas or oil, it can be demonstrated that a Caloritech immersion heater is often your best choice. The electric heater provides close to 100% efficiency, is safer and easier to control, and is usually cheaper to install. Installation – Listed heaters have standard 1in. to 2 1/2in. NPT tapered plugs. Any other size or type of plug is available on special order. The heater is installed through a threaded half coupling located in the vessel wall well below the minimum liquid level but spaced sufficiently above the bottom to allow for sludge build-up which should never be allowed to cover any part of the elements. Horizontal installation is preferred even though heater replacement will require draining of the tank. Operation – For an immersion heater to transfer heat it must establish a balance between convection currents and the temperature difference between itself and the liquid. Viscous liquids which retard convection currents are the most difficult to heat. Care must be exercised to ensure that the required rate of heat transfer from the heating elements is achieved without overheating the element and the liquid resulting in coking. This is generally achieved through the selection of heater watt density. Heaters immersed in liquids, such as water with high calcium and magnesium content, phosphates or eluate solutions, have a tendency to precipitate their solids. These heaters require scheduled maintenance to remove scale build-up which may thermally insulate the elements and reduce their service life. Heat Type: Electric Screwplug Immersion Heaters Terminal Box Type: Explosion-Proof Terminal Box Model: Caloritech? CXF Series Screwplug Immersion Heater, 2″”NPT Immersion Length: 11.8 Inches / 300 mm Number of Heating Elements: Two Heating Elements Safety Certifications: CSA, C/US Safety Certified Voltage: Custom built heaters are available in any special voltage rating up to 600V. Wattage: Heaters listed are standard wattage. Any reasonable wattage is available to replace your present heater with a similar Caloritech? unit. Immersion Length: Heaters are available with immersed lengths up to 135″” (3430 mm). Internal vessel support must be used when the immersed length exceeds 49″” (1245 mm). Plug Sizes and Ratings: Thermon Heating Systems can install elements in virtually any size or rating of plug, special or standard. Moisture Resistant Terminal Housings: Moisture resistant terminal housings suitable for outdoor applications are available for all heater sizes. Explosion-Proof Terminal Housings: If the heater is to be operated in a hazardous environment an explosion?proof housing must be used. See Figure 5 on page B20. Specify Class, Div. (or Zone), Group, and Temp. Code for the hazardous location. For Models With a Built-in Thermostat: Standard built?in thermostat is a one-pole device limited to 240V 25 amp. Whenever the heater voltage exceeds 240V or the heater current exceeds 25 amps or for three phase supply, the thermostat is intended for pilot duty only and is not factory wired to the elements. See Section F of the Caloritech? catalog for the selection of the contactor and control transformer you may require in these instances. Heaters With Built-in Thermostats: All screwplug heaters listed are available with built?in thermostats. Heaters with thermostats have a ?T? added to their catalog no prefix. The standard thermostat range is 50°F to 250°F (10°C to 120°C). Ratings are normally 25 amps at 240V single pole single throw. 600V thermostats and double pole thermostats are available on special order. Special Thermostat Ranges: Thermostats with the following temperature ranges are also available upon request: 0°F to 100°F (-18°C to 40°C), 150°F to 550°F (70°C to 280°C), 300°F to 700°F (150°C to 370°C) Warning – Fire Hazard: The heaters listed in the catalog may occasionally malfunction in normal use and if operated in the presence of explosive or combustible materials may cause fires. Do not operate in the presence of explosive or combustible materials. Observe fire prevention precautions and consult the local sales office or conta