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Back to Control Thermostats |
Remote
Controlled Variable Thermostat 
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MQT11LV
The
conventional variable thermostat using bimetal has
a control shaft extending directly from the body.
However, our series offers a thermostat which temperatures
can be controlled remotely. The thermostat is contained
in a small case and its temperature can be continuously
adjusted by controlling resistance value of remotely
located potentiometer. This arrangement has been adapted
into many new product designs.
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See Technical Information
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Applications
Freeze Protection, Medical Applications, Food Warming,
Fan Control, Heating Blankets, Thermo-Electric Heaters,
LCD Displays |
Structure
of temperature sensing section
(MQT11LV shown)
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Principle
of Operation
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Suppose the temperature-fixed thermostat T is set
at 40ºC. When the resistance of VR is in a high resistance
region and the built-in small heater R does not generate
any heat at all, the operating temperature of the
thermostat remains at 40ºC and the thermostat operates
just like an ordinary thermostat.
• If VR is adjusted to its minimum resistance
value, R generates heat and raises the temperature
inside the housing to 20 degrees above room temperature.
If room temperature is 20ºC, the temperature inside
the housing becomes 40ºC, and the thermostat shuts
off.
• Thus, the thermostat operates at a lower temperature
using the heat generated by the built-in heater, and
an inexpensive, remotely controllable variable thermostat
is available without using complex control system.
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Schematic
diagram
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Operating
diagram
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Ordering
Information for this system
1.This system is not applicable where heat inside the
housing rapidly dissipates due to strong wind, etc..
It is suited for applications where heat stays inside,
for example, when used with a heating mat.
2.Resistance of VR and R need to be determined by the
voltage and the temperature variable range. A technical
bulletin for typical applications is available. Custom-design
may be needed depending on your particular requirements.
3.Commercially available variable resister with curve
"B" can not be used. Curve "D" or
equivalent is required.
4.This product is custom-designed and it takes time,
therefore small quantity orders are not acceptable.
5.We accept a possible order for minimum production
of 1,000 pieces.
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Control
Thermostats
Canadian Thermostats & Control Devices Ltd.