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Catalogue Flexible Heaters Design Guide

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CT325 Miniature DC Temperature controller

Tight control in a small package

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 manufacturer, 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 Q or 1000 Q platinum RTDs or 50 kQ 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 applications. Specific temperature ranges, other sensor options, and special packaging are possible for volume OEM applications.

Specifications

Input: 100 fi or 1000 fi platinum RTD, 0.00385 fi/fi/°C, 2 or 3-leads, or 50 k fi 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.


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

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/ fi for 100 fi or 1000 fi platinum up to 25 fi 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.

Specifications subject to change

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