Special Heaters
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Special Heaters
11/28/00
8:18 AM
Page 227
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Special Heaters Advanced Technology Capabilities
Performance Capabilities • Operating temperatures to 2000°F (1371°C) • Watt densities to 2000 W/in2 (310 W/cm2) when operating in water Features and Benefits • Complete documentation packages include drawings, material lists, test and process procedures, traceability records, and other documents required for compliance with your specifications. • Special sheath materials, such as zircaloy, titanium or tantalum, are available for demanding applications.
Special Heaters
When design parameters exceed the performance capabilities of ordinary heaters, or require special configurations or sizes, or need to withstand hostile environments, Watlow’s Special Heaters Department is uniquely qualified to service even the most demanding needs. High wattage requirements: Watlow engineers have designed heaters that require distributed wattage with ratios of five to one in a single unit. Size requirements: From the 52 foot (15.9 m) long FIREROD® cartridge heater we built for a nuclear test facility, to the 0.055 inch (1.40 mm) diameter heater used in earth core sampling, we won't limit ourselves when it comes to heater size. Hostile environments: Extreme temperatures, corrosive materials, or contaminating toxins; we can build heaters to withstand almost any environment. Sensing requirements: We can design heaters that require several built-in sensors. Multiple thermocouple, RTDs or thermistors can be installed inside the heater or in the sheath.
• Sizes as small as 0.055 inch (1.40 mm) to 1 3⁄4 inch (44.5 mm) in diameter or as long as 0.50 inch (12.7 mm) to 52 feet (15.9 mm). • Special formulated insulating materials, as well as aluminum oxide and boron nitride, maximize heater performance. • In-house, non-destructive testing capabilities include liquid penetrant, radiographs, and hydro and helium leak testing to assure customer specifications are met. • Built-in multiple thermocouples, RTDs and thermistors measure internal and external temperatures.
• Special configurations are designed to fit your equipment precisely, whether the unit is coiled, flat, straight or angled. Applications • Aerospace • Nuclear power, both land- and sea-based • Medical research, including DNA, cancer and heart • Environmental instrumentation • Defense industry • Circuit boards • Refrigeration systems • Packaging equipment • Freeze protection • Semiconductor processing equipment
227
Special Heaters
11/28/00
8:18 AM
Page 228
Special Heaters Advanced Technology Capabilities Applications
DNA Heater Designed for Precise Temperature Control A medical equipment manufacturer was developing a test unit for DNA samples. Specifications included a 30 volt, 40 watt heater with temperature sensing capability, designed to fit within an area 0.375 inch (9.5 mm) diameter by two inches (50.8 mm) in length. Watlow's Special Heaters Department designed and built the Photo shows the finished assembly and components for the DNA application: heater, thermistor, plus the customer-supplied tantalum heater support and housing.
228
25-Year Old Heaters Finally Replaced A nuclear reactor required unusually long cartridge heaters to heat the reactor's coolant, keeping the solution warm during off cycle. The heater had to maintain a vessel temperature of 700°F (371°C). The required measurements were 3⁄4 inch (19 mm) in diameter by 30 feet 89⁄16 inches (9.4 mm) in length, +1⁄4 inch (+6.4 mm). The heated section was 18 feet (5.5 m) long, while the cold section was 12 feet (3.7 m).
How to Order Special heaters are available as made-to-order units only. To order, please specify: • Temperature requirement • Watt density • Material requirements
heater assembly, which consisted of a 0.055 inch (1.40 mm) diameter by 111⁄32 inch (34.1 mm) long tubular element formed into a circle. Watlow engineers utilized a resistance wire 0.002 inch (0.05 mm) in diameter and wound it into a 0.020 inch (0.5 mm) diameter coil. The assembly also included a thermistor to closely sense temperature change.
Watlow's Special Heaters Department designed and manufactured the heaters to the customer's unusual requirement in 1965. After operating for twenty-five years, Watlow replaced those heaters following the same specifications, but making some internal improvements. The new heaters are expected to outlast the reactor.
• Dimensional requirements • • • •
Operating voltage Environmental conditions Lead configuration Application requirements
11/28/00
8:18 AM
Page 227
W
A
T
L
O
W
Special Heaters Advanced Technology Capabilities
Performance Capabilities • Operating temperatures to 2000°F (1371°C) • Watt densities to 2000 W/in2 (310 W/cm2) when operating in water Features and Benefits • Complete documentation packages include drawings, material lists, test and process procedures, traceability records, and other documents required for compliance with your specifications. • Special sheath materials, such as zircaloy, titanium or tantalum, are available for demanding applications.
Special Heaters
When design parameters exceed the performance capabilities of ordinary heaters, or require special configurations or sizes, or need to withstand hostile environments, Watlow’s Special Heaters Department is uniquely qualified to service even the most demanding needs. High wattage requirements: Watlow engineers have designed heaters that require distributed wattage with ratios of five to one in a single unit. Size requirements: From the 52 foot (15.9 m) long FIREROD® cartridge heater we built for a nuclear test facility, to the 0.055 inch (1.40 mm) diameter heater used in earth core sampling, we won't limit ourselves when it comes to heater size. Hostile environments: Extreme temperatures, corrosive materials, or contaminating toxins; we can build heaters to withstand almost any environment. Sensing requirements: We can design heaters that require several built-in sensors. Multiple thermocouple, RTDs or thermistors can be installed inside the heater or in the sheath.
• Sizes as small as 0.055 inch (1.40 mm) to 1 3⁄4 inch (44.5 mm) in diameter or as long as 0.50 inch (12.7 mm) to 52 feet (15.9 mm). • Special formulated insulating materials, as well as aluminum oxide and boron nitride, maximize heater performance. • In-house, non-destructive testing capabilities include liquid penetrant, radiographs, and hydro and helium leak testing to assure customer specifications are met. • Built-in multiple thermocouples, RTDs and thermistors measure internal and external temperatures.
• Special configurations are designed to fit your equipment precisely, whether the unit is coiled, flat, straight or angled. Applications • Aerospace • Nuclear power, both land- and sea-based • Medical research, including DNA, cancer and heart • Environmental instrumentation • Defense industry • Circuit boards • Refrigeration systems • Packaging equipment • Freeze protection • Semiconductor processing equipment
227
Special Heaters
11/28/00
8:18 AM
Page 228
Special Heaters Advanced Technology Capabilities Applications
DNA Heater Designed for Precise Temperature Control A medical equipment manufacturer was developing a test unit for DNA samples. Specifications included a 30 volt, 40 watt heater with temperature sensing capability, designed to fit within an area 0.375 inch (9.5 mm) diameter by two inches (50.8 mm) in length. Watlow's Special Heaters Department designed and built the Photo shows the finished assembly and components for the DNA application: heater, thermistor, plus the customer-supplied tantalum heater support and housing.
228
25-Year Old Heaters Finally Replaced A nuclear reactor required unusually long cartridge heaters to heat the reactor's coolant, keeping the solution warm during off cycle. The heater had to maintain a vessel temperature of 700°F (371°C). The required measurements were 3⁄4 inch (19 mm) in diameter by 30 feet 89⁄16 inches (9.4 mm) in length, +1⁄4 inch (+6.4 mm). The heated section was 18 feet (5.5 m) long, while the cold section was 12 feet (3.7 m).
How to Order Special heaters are available as made-to-order units only. To order, please specify: • Temperature requirement • Watt density • Material requirements
heater assembly, which consisted of a 0.055 inch (1.40 mm) diameter by 111⁄32 inch (34.1 mm) long tubular element formed into a circle. Watlow engineers utilized a resistance wire 0.002 inch (0.05 mm) in diameter and wound it into a 0.020 inch (0.5 mm) diameter coil. The assembly also included a thermistor to closely sense temperature change.
Watlow's Special Heaters Department designed and manufactured the heaters to the customer's unusual requirement in 1965. After operating for twenty-five years, Watlow replaced those heaters following the same specifications, but making some internal improvements. The new heaters are expected to outlast the reactor.
• Dimensional requirements • • • •
Operating voltage Environmental conditions Lead configuration Application requirements
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