User Manual

9
Thermal Solutions Design Guide | Specifications subject to change
Custom Design Options
Integrating sensors and thermal cut-outs
Description Options Features
Surface Mount RTDs and
Thermistors
Miniature sensors mounted
via surface mount
technology
• Low installed costs
• Geared for medium to
high volumes
• Fast time response
• Stable and accurate
• Sizes: 0805, 0603, 0402
• RTD:100Ω and 1KΩ platinum;
±0.06% or ± 0.12% at 0°C
• (DIN class A or B)
• Thermistor: 10KΩ and 50KΩ ;
±1% at 25°C
Thin-film RTDs
Small ceramic elements
laminated inside the heater
or located on top
• Highly stable and accurate
• Standardized output
• Low cost
• Tight resistance tolerance
• Platinum, 0.00385 TCR
• 100 to 10,000 Ω
• Wire leads or SMT
• 0.12% or 0.06% tolerance
Strip-wound RTD
Sensing wire wound around
a flexible insulating strip and
encapsulated inside heater
• Can average temperatures
along length of sensor.
• Any resistance possible
• Platinum, nickel, nickel-iron.
Flat-wound RTD
Sensing wire laid in a
predetermined pattern in a
single plane
• Fast response (0.1 sec.)
• Can average temperatures
along length of sensor.
• Platinum, nickel, nickel-iron
• Uniform or profiled
Etched RTD
Heater and RTD etched from
same temperature sensitive
foil
• Lowest cost
• Fast response
• Can average temperatures
along length of sensor.
• Nickel or nickel-iron
Thermistor
Bare or coated bead
embedded in heater or
placed on top and covered
in epoxy.
• High sensitivity
• Low to moderate cost
• NTC or TC
• Variety of resistances
• Bead or SMT
Thermocouple
Junction of dissimilar metals
laminated inside heater
• Minimal space required
• Rugged construction
• Wide temperature range
• Wire or foil
• E, J, K, or T standard
Thermostat
Low cost basic heater control
or thermal cutoff.
• No external controller
• Low system cost
• Snap action or creep action
• Specifiy setpoint
• Wired/mounted to heater
Types of sensors used in heater/sensors
Temperature sensors
Integrating sensors into heaters simplifies your assembly
operations by providing a gradient-free system with excellent
temperature control. The sensor sits in a window of the heating
element. It reacts to temperature changes in the component
beneath the heater, yet remains close to the heating element
itself. This tight coupling of heater, sensor, and heat sink can
greatly improve heating control and accuracy.
Sensors can be electrically connected via leadwires or
flex circuitry.