User Manual
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Thermal Solutions Design Guide | Specifications subject to change
Overview
The CT325 Miniature DC Temperature Controller is designed
for use with Minco Thermofoil™ heaters and RTD or thermistor
sensors. It oers inexpensive on/o temperature control of
your process or equipment with accuracy many times better
than bimetal thermostats. Easily read and adjust the set point
temperature using a voltmeter, then monitor the actual signal
temperature at the other end. Operating from your 4.75 to 60
volt DC power supply, the controller can switch up to 4 amps
power to the heater. A bright LED indicates when power is
applied to the heater.
• The entire unit is epoxy filled for moisture resistance, with
a through-hole for a mounting bolt. A terminal block
provides the power input, sensor input and heater output
connections.
• Tight control in a small package means that enclosures
or panel spaces are not required which allows successful
portable device implementation.
• Simple control without complicated programming can
reduce set-up time.
• Three-wire RTD connection cancels lead resistance for
highly accurate temperature readings.
• Solid state on-off control with adjustable set point
improves durability compared to electro-mechanical
devices.
• Flexible heating control compliments all Minco Thermofoil
heaters for convenient off the shelf operation.
• Uses standard 100Ω or 1000Ω platinum RTD or 50kΩ
thermistor sensor input.
• Single DC power source provides power to the controller
and heater up to 240 watts.
Applications
• IV solutions for medical/surgical applications
• Military batteries
• Enclosures to maintain the temperature of electronics
• Ruggedized laptop LCDs and hard drives
Custom design options
Minco can customize the design of the CT325 for special
applications. Specific temperature ranges, other sensor
options, and special packaging are possible for volume OEM
applications.
Specifications
• Input: 100Ω or 1000Ω platinum RTD, 0.00385 Ω/°C, 2 or
3-leads, or 50kΩ NTC thermistor, 2-lead.
• Setpoint range: 2 to 200°C (36 to 392°F) for platinum RTD
input. 25 to 75°C (77 to 167°F) for thermistor input. Consult
factory for other ranges.
• Setpoint stability: ±0.02% of span/°C.
• Vtemp signal: 0.010 V/°C over specified range.
• Deadband: ±0.1°C (0.2°F).
• Input power: 4.75 to 60 VDC.
• Output: Open drain, 4 amps max. DC.
• Leadwire compensation: (3-wire RTD) ±0.06°C/ Ω for 100Ω
or 1000Ω platinum up to 25 Ω per leg.
• Fault protection: Heater disabled on RTD short or
thermistor open. No heater protection; external fuse is
recommended.
• Operating ambient temperature range: -40 to 70°C (-40 to
158°F).
• Relative humidity: 0 to 95% non-condensing.
• Physical: Polycarbonate case, epoxy sealed for moisture
resistance.
• Weight: 1 oz. (28g).
• Connections: Terminal block for wires AWG 22 to AWG 14.
• Mounting: Mounting hole for #6 screw through or #8
thread forming screw.
CT325 Miniature DC Temperature Controller
Inexpensive heater control