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A humidistat or hygrostat is an electronic device analogous to a thermostat but which responds to relative humidity, not temperature. A typical humidistat is usually included with portable humidifiers or dehumidifiers. It can also be included with combined air cleaner or humidifier units to control a home's humidity level or any other indoor ...
This standard, EIA 583, called for the use of humidity indicator card that would indicate as low as 10%. Adherence to proper storage and handling methods immediately reduced the number of failures in the semiconductors, but over the years it became apparent that even humidity levels under 10% were detrimental to the devices.
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A control dial is usually provided that permits the user rough adjustment of the humidity level. More sophisticated designs link the cooler to a settable digital hygrometer, allowing very precise humidity level control. Another form of electronic dry box technology utilizes multi-porous molecular sieve desiccants to absorb moisture.
The wet-bulb temperature is the lowest temperature that may be achieved by evaporative cooling of a water-wetted, ventilated surface.. By contrast, the dew point is the temperature to which the ambient air must be cooled to reach 100% relative humidity assuming there is no further evaporation into the air; it is the temperature where condensation (dew) and clouds would form.
The central controller has one point-to-point data communication wire connected to each module. The protocol between the central controller and the modules uses a 5V pulse width encoding as follows: A header that is 4100 μs high and 300 μs low; One pulse per I/O port, i.e. 16 pulses for input modules and 8 pulses for output modules
Hence, the regulated temperature is like a sliding mode of the variable structure system setup by the bang–bang controller. Symbol for a bang–bang control. In control theory, a bang–bang controller (hysteresis, 2 step or on–off controller), is a feedback controller that switches abruptly between two states.