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Tempco - Hi-Density Cartridge Heaters
Standard sheath material is 321 Stainless Steel which provides good thermal conductivity, and resistance to corrosion and scaling. Welded end disc made from the same material as the sheath provides a positive seal against moisture and other contaminants. Grade “A” Nickel-Chrome resistance wire precisely wound on a high purity magnesium oxide core places the resistance wire as close to the inside of the sheath as possible. A high purity Magnesium Oxide (MgO) powder is used to fill all remaining space inside the sheath. Heater is then swaged, which compacts the magnesium oxide grains into a solid mass. The standard termination for is Type N, 10" (254 mm) long nickel conductor lead wires externally connected to solid conductor terminal pins.
Type TF: Thermal Fuses
- Thermal fuses can be built into cartridge heaters to act as a high limit for the heater in applications where the temperature must be limited to avoid dangerous situations. When the trigger point is reached, the thermal fuse will open, cutting the electrical current to the cartridge heater. Once the thermal fuse opens, it cannot be reset. Many different trigger temperatures are available.
Type TS: Thermostat
- Cartridge heaters with built-in thermostats are very efficient and economical for heating and controlling temperatures. Available with NPT or special type mounting fittings, they provide a self-contained heater mainly recommended for immersion applications. They can also be used as over-temperature safety devices. The thermostats are factory preset for the trip temperature; therefore, prototyping and testing is required to determine the exact fixed setpoint. Maximum temperature—302°F (150°C). Maximum Amps—8@120 Volts. A minimum 2-1/2" cold section is required to house the thermostat. Consult Tempco with your requirements.
Type TM: Thermistor
- Tempco has the ability to custom design cartridge heaters with built-in temperature sensors such as thermistors and RTDs. For specific applications that have a limited or single set point range, thermistors or RTDs in conjunction with simple electronic controllers can be an economical choice. NOTE: For thermocouples see page 2-58.
Type RD: RTD Temperature Sensor
- Tempco has the ability to custom design cartridge heaters with built-in temperature sensors such as thermistors and RTDs. For specific applications that have a limited or single set point range, thermistors or RTDs in conjunction with simple electronic controllers can be an economical choice. NOTE: For thermocouples see page 2-58.
Standard Electrical Tests & Optional Test Reports
- Standard Electrical Tests and Optional Test Reports
- 1. Resistance test — measures ohms at room temperature.
- 2. IR (insulation resistance) test — measures the insulation resistance to the flow of current. Standard test is done at 500VDC.
- 3. Hipot (high potential) test — a high voltage is applied between a product`s current carrying conductors and its metallic enclosure to verify that the insulation is sufficient to protect the operator from electrical shock.
- 4. Leakage current test — measures the current that flows from any conductive part to ground.
- 5. Heaters can be serialized and test reports can be sent with each shipment if required. Contact Tempco with your requirements.
Die Penetrant Test
- This non-destructive testing can detect imperfections in weld joints. For critical applications, each individual heater’s weld joints by end cap and fittings can be tested. Certified test reports will be sent with each shipment. Consult Tempco for details.
Hydrostatic Pressure Test
- Cartridge heaters with attached pipe fittings can be pressure tested to your specifications at Tempco. Our in-house testing capabilities can ensure that your products meet your exact specifications. Contact Tempco with your requirements.