Technical data
81
Special Developments
Special Developments
Thick-fi lm heater elements,
Miniature heater elements
High-performance hybrid systems
with SMD technology
Hybrid elements offer advantages of small dimensions with high
performance. They are suitable as outside-applied container heat-
ers for use in laboratories, industry, smelting bodies, nozzle heaters
and various applications in motor vehicles. These elements are
vibration resistant and possess very good high-frequency charac-
teristics. SMD technology permits control and regulation devices
directly on the heater (max. 130 °C).
Specifi c surface rating:
15 to 77 W/cm
2
depending on paste material
Calibration:
to ± 0.1 % (absolute and relative) with laser
Temperature coeffi cient:
≤ 30 ppm / K
Temperature
increase rate:
up to 100 K/s
Carrier
material/thickness:
aluminium oxide AI2O3 / 0.25 mm < s <
1.3 mm; stainless steels 1.4016 and 1.4301
with pressed glass insulation 1 mm < s <
3 mm
Dimensions:
2" x 2" (50.8 mm x 50.8 mm), 4" x 4" (101.6
mm x 101,6 mm), other formats possible
Geometric shaping:
laser processing, stamping
Sensor technology:
preferrably PTC-Pt, Ni, NTC (also pressed on)
Over-temperature
protection:
direct contact bi-metal monitors up to max.
200°C, optionally with tracer heater circuit for
implementation of a limiter function, smelting
safety (temperature dependent) Ø 4 mm
Heat conductor:
for AI2O3, preferably glued (max. 230 °C
continuous temperature) in combination with
aluminium sheet metal for heat distribution.
Surface contact and direct contact with the
medium for small surface loads; steel in direct
contact with medium
Heat conductance:
25 W/mK
Breakdown strength:
8.3 KV/mm (210 V / mil)
Dielectric loss factor
␦:
2·10-4 at 1 MHz
Chemical resistance:
see stainless steels and technical ceramics.
Conductive and resistance pastes are dishwash-
er safe; when coated with polymers or special
glass, also conditionally acid resistant.
Regulation:
by SMD technology; PD temperature regulator
can be realised directly on the heater plate
Current rating:
1 A per mm width (depending on design, up to
3 A/mm possible)
Voltage rating:
100 V max (at 0.4 mm spacing)
Resistors:
resistor range 10-3-109 ⍀
RoHs compatibility:
yes