Datasheet

28
Introduction
Design
Guide
Polyimide
Heaters
Silicone
Rubber
Heaters (foil)
Standard
Polyimide
& Rubber
Rubber
Heaters
(wire-wound)
Mica Heaters
Thermal-Clear
Heaters
All-Polyimide
Heaters
Sensors,
Controllers &
Accessories
Reference
|
Flexible Heaters Design Guide | www.minco.com
Specifications subject to change
Specifications
Setpoint range: Nominal resistance ±20% min. Specify heater
resistance to produce the necessary heat output in watts, given
available voltage.
Connections: Three pins on 0.1" centers or AWG 22 wires.
Power supply voltage: 4.75 to 10 VDC or 7.5 to 60 VDC,
depending on model. Ripple up to 10% has negligible effect;
simple unregulated DC supplies are adequate for most
applications.
Nominal heater current: 0.05 to 4 amps. See ranges below.
Higher current possible with special models.
Scan rate (temperature above setpoint): 1 second standard.
0.1 seconds to 10 seconds optional.
Scan pulse width: 10 milliseconds.
LED indicator: Indicates heater power on. Optional on leadwire
versions.
Calibration accuracy: ±0.2% std*. Note that standard resist-
ance tolerance on heaters is ±10%.
Hysteresis: 0.05%*.
Setpoint drift due to:
Self-heating: ±0.2%* (±0.4% for 1.5 to 4 A range).
Ambient temperature: ±0.02%/°C* (±0.06%/°C for 1.5 to 4 A
range).
Supply voltage change: ±0.03%/volt*.
Supply voltage ripple effects: Negligible, assuming 50/60Hz,
10% max. ripple.
Controller supply current:
Output ON: 3 mA max.
Output OFF: 2 mA max; 1 mA typical at 10 VDC.
Ambient temperature:
Operating: -40 to 70°C (-40 to 158°F).
Storage: -55 to 85°C (-67 to 185°F).
Relative humidity: 90% max.
Physical: Epoxy sealed for moisture resistance. Will withstand
wave soldering and water/detergent wash; contact Minco
before cleaning with other chemicals.
Weight: 1 ounce (28 g).
Mounting: Mounting hole for #6 screw through, or #8 thread
forming screw.
Heater: Wire-wound or etched-foil heater with high
temperature coefficient of resistance (TCR).
Heater element TCR (Ω/Ω/°C)
Copper foil or wire (Cu) 0.00427
Nickel foil (Ni) 0.00536
Nickel wire (Ni) 0.00672
Nickel-iron foil or wire (NiFe) 0.00519
Nominal heater
current
Minimum
current
for proper
sensing
Maximum
current
(1 minute)
Output ON
resistance
in series
with heater
(pin 3 to 2)
Minimum
output
OFF
resistance
CT198
0.05 to 0.2 A 0.012 A 0.5 A 2.3 Ω 50K Ω
0.21 to 0.5 0.050 1.0 0.8 50K
0.51 to 1.5 0.125 2.0 0.5 50K
1.51 to 3.0 0.350 4.0 0.3 50K
2.50 to 4.0 1.0 5.0 0.25 50K
* To convert resistance deviations to temperature:
Where:
TCR = Temperature coefficient of resistance (Ω/Ω/°C)
T = Setpoint temperature (°C)
ΔΤ = Temperature deviation (°C)
For example, assume a Heaterstat setpoint of 50°C, and
heater TCR of 0.00536 Ω/Ω/°C (nickel foil). Calibration
accuracy is ±0.2% of nominal resistance which translates to
temperature as:
CCT °±=
⎟
⎠
⎞
⎜
⎝
⎛
+°±=Δ 47.0
00536.0
1
50%2.0
⎟
⎠
⎞
⎜
⎝
⎛
+=Δ
TCR
TdeviationT
1
%
Heaterstat™ Sensorless DC Controller