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About Humidity Controllers
Humidity controllers monitor and maintain proper humidity levels in environmental test applications, food storage areas, and electronic equipment rooms. They often include rate indication features and totalizer, data logger, and chart recorder capabilities. Humidity controllers that provide heating and cooling control are also available. Multi-functional products can be used to control thermoelectric, thermistor, or thermocouple heaters; or to control resistance temperature detectors (RTD), resistive heaters, or heating elements. Typically, suppliers indicate whether humidity controllers are designed for use liquids, solids, powder, gases, air, or steam. Some humidity controllers have a printed circuit board (PCB) form factor. Others are designed for mounting in a rack, on a DIN rail, or on a wall, chassis, enclosure or cabinet. Stand-alone process controllers are benchtop or floor-standing units with a full casing or cabinet and an integral interface.
Humidity controllers use several different control techniques. Limit control (off-on control, bang-bang control) establishes set points or limits that, when reached send a signal to stop or start a process variable. Linear control matches a variable input signal with a correspondingly variable control signal. Signal conditioning, filtering, and amplification are then used to produce the proper output control signal. Proportional, integral, and derivative (PID) control requires real-time system feedback. Feedforward control provides direct-control compensation from the reference signal. This type of control technique can be open-loop or used in conjunction with more advanced PID control. Fuzzy logic is a type of control in which variables can have imprecise values (as in partial truth) rather than a binary status (completely true or completely false). Advanced or nonlinear controls include algorithms such as adaptive gain and neural networking.
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Engineering Web: Humidity Controllers
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Humidity Panel Mount Controllers / Switches / Alarms /... Cole-Parmer Catalog > Humidity Products > Humidity Panel Mount Controllers / Switches / Alarms / Monitors |
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Cisco 2100 Series Wireless LAN Controllers [Cisco 2100... CISCO 2100 SERIES WIRELESS LAN CONTROLLERS Cisco 2100 Series Wireless LAN Controllers See Cisco Systems, Inc. Information |
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Dwyer Instruments Home Page 2009 Pressure Air Velocity Flow Level Temperature Process Control Data Loggers & Recorders Humidity Air Quality Test Equipment Valves Miscellaneous See Dwyer Instruments Inc. Profile & Catalog |
Part Numbers for Humidity Controllers
| Part # | Distributor | Manufacturer | Product Category | Description |
|---|---|---|---|---|
| CRH100A032A01 | Digi-Key | C-TON Industries | Sensors, Transducers | CONTROLLER HUMIDITY HVAC WHITE |
| IR32V4L000 | Newark | CAREL | All Supplier Direct Ship | Controller, Humidity Ir; Accuracy, Percentage:0.5%; Cut-Out Size, Panel:71 X 29Mm; Ip Rating:Sealed To Ip65; Operating Range:Scaleable -99 To +999; Power Consumption:3Va Max; Relay Output:8A; Temp, Op. Max:50?C; Temp, Op. Min:0?C; |
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