Datasheet
31
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
Sal es and Support
Americas: 763.571.3121 | Europe: (33) 5 61 03 24 01 | Asia Pacic: (65) 6511 3388
|
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 offers inexpensive on/off 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 100 Ω or 1000 Ω platinum RTDs or
50 kΩ 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 hardrives
Custom design options
Minco can customize the design of the CT325 for special appli-
cations. Specific temperature ranges, other sensor options, and
special packaging are possible for volume OEM applications.
Specifications
Input: 100 Ω or 1000 Ω platinum RTD, 0.00385 Ω/Ω/°C,
2 or 3-leads, or 50 k Ω 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.
V
temp
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 100 Ω or
1000 Ω 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.
Platinum RTD sensor Thermistor sensor
2°C 0.02 V 25°C 0.25 V
50°C 0.50 V 50°C 0.50 V
100°C 1.00 V 75°C 0.75 V
200°C 2.00 V
Accuracy: ±1% of span Accuracy: ±2% of span
Linearity: ±0.1% of span Linearity: ±2% of span
CT325 Miniature DC Temperature Controller
Tight control in a small package
CT325 DC Controller