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Thermostats and hygrostats are used to regulate temperature and humidity inside an enclosure. Electronic and mechanical models are available, with fixed or adjustable setpoints to fit a wide range of applications.
Thermostats, Hygrostats (Humidistats) and Hygrotherms
- Enclosure Climate Controls
Thermal Management for Temperature and Moisture Control in Industrial Enclosures
Depending on the surrounding environment and the sensitivity of the components they protect, many enclosures require either some type of cooling device to dissipate excessive heat, heaters to prevent the formation of condensate or frost. Some enclosures require both.
But heating and cooling devices typically don't need to run continuously. They need to be controlled, both to prevent overheating or overcooling, and to control the energy costs of heating and cooling.
AutomationDirect offers several types of devices to control heating and cooling devices:
- Thermostats sense the temperature of the air inside the enclosure and compare it to a setpoint, which is either the minimum or
maximum temperature that the enclosure should maintain. The setpoint may be a fixed, preset temperature characteristic of a tamperproof
thermostat. Or the setpoint may be set by the user with the range of an adjustable thermostat.
Thermostats are either Normally Closed (N.C.) or Normally Open (N.O.), depending on whether the contacts are closed or open when the surrounding temperature is less than the thermostat's setpoint.
N.C. thermostats are identifiable by either a red module on tamperproof thermostats or a red adjustment dial on adjustable thermostats.
N.O. thermostats are identifiable by either a blue module on tamperproof thermostats or a blue adjustment dial on adjustable thermostats. - Hygrostats (also known as humidistats) sense the relative humidity of the air inside the enclosure. If the relative humidity rises above the setpoint, the contacts close to start a heater. Since warm air can hold more water vapor than cold air, the temperature increase caused by the heater causes the relative humidity to decrease, reducing the exposure to moisture and corrosion issues.
- Hygrotherms sense both temperature and relative humidity and start a heater if either parameter falls below the setpoint.
Different types of thermostats, hygrostats, and hygrotherms have difference characteristic switching differences and tolerances. Users should take these characteristics into account when selecting a control device for their application.
Tamperproof Thermostats for Enclosuress
- 35mm DIN rail mounting
- Thermostatic bi-metal sensor element
- Five fixed temperature setpoint ranges available
- Snap-action contact
- N.O. and N.C. single thermostats
- N.C. / N.O. or N.O. / N.O. dual thermostats
- Color coded red (N.C.) and blue (N.O.) modules
- CE, UL Recognized, RoHS compliant
Single tamperproof thermostats
(011600-00, 011600-01, 011610-02)
are
$13.00
Dual tamperproof thermostats
(011630-00, 011610-00, 011640-00)
are
$23.50
Hazardous Area Thermostats
for Enclosure Heaters
Compact, small mechanical thermostat offering a high response accuracy, small switching difference, and a very long service life (switching cycles) for the regulation of heaters deployed in hazardous areas. High current performance allows direct control of a heater.
- For use in hazardous areas
- High switching capacity
- Compact design
- "Pre-set" temperatures
- Ready to use with strain relief
- Temperature class T6 (185°F/85°C max.)
- DIN rail mounting
- IP66 / I (grounded)
Hazardous Area thermostats (011850-00, 011851-00)
are
$96.00
Adjustable Thermostats for Enclosures
- 35mm DIN rail mounting
- Thermostatic bi-metal or PTC sensor element
- Available with snap-action or SPDT/change-over contact
- Wide 32°F to 140°F, -15°C to 45°C, -10°C to 50°C, 0°C to 60°C and 20°C to 80°C adjustment ranges available
- N.C. (red dial) and N.O. (blue dial) units available
- CE, CSA, UL Recognized File No. E164102, RoHS compliant
Small adjustable setpoint thermostats (011409-00, 011419-00, 011420-00, 011469-00,
011479-00, 011570-00, 011580-00)
are
$16.50
Compact Thumbwheel Thermostats (011150-00, 011159-00, 011160-00, 011169-00)
are
$21.50
Mechanical Thermostats (011700-00, 011700-01, 011709-00, 011709-01)
are
$32.50
Electronic Thermostats (011900-00, 011900-01)
are
$43.50
Adjustable Dual Setpoint Thermostats for Enclosures
This unit houses two separate, independently adjustable thermostats, allowing independent control of heating, cooling or other equipment.
- 35mm DIN rail mounting
- Thermostatic bi-metal sensor elements
- Wide 32°F to 140°F, 68°F to 176°F, 0°C to 60°C, and 20°C to 80°C adjustment ranges available
- Color Coded temperature dials
- CE, CSA, UL Recognized File No. E164102, RoHS compliant
Adjustable dual setpoint thermostats
(011720-00, 011720-01,
011750-00, 011750-01, 011760-00, 011760-01)
are
$32.00
Hygrostats for Enclosures
- DIN rail mounting
- SPDT/change-over contact
- Available in adjustable setpoint or tamperproof models
- 40% to 90% RH setting range on adjustable models, 65% RH preset on tamperproof models
- 120 VAC and 230 VAC operating voltage versions
- Integrated LED visual function display
- CE, CSA-US#:215952, RoHS compliant
Electronic hygrostats
(012450-00, 012459-00, 012460-00, 012469-00)
are
$58.00
Electronic Hygrotherms for Enclosures
Electronic hygrotherms sense the ambient temperature and relative air
humidity.
Depending on the selected contact combination,
the hygrotherm will turn a connected device ON or OFF if either the
temperature is below the set point, or the humidity is above the
set point. Hygrotherms are typically used to control PTC heaters,
fan heaters, condensation heaters, or other climate control
devices.
- DIN rail mounting
- Adjustable relative humidity and temperature setpoints
- 40% to 90% RH setting range
- 32°F to 140°F and 0°C to 60°C temperature setting range
- 100-240 VAC operating voltage
- Optical function display - integrated LED in each adjustment knob indicates active function
- CE, UL Recognized File No. E164102, RoHS compliant
Electronic hygrotherm (012300-00, 012309-00)
is
$88.00
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