Humidity controller and umac
The humidity controller maintains the humidity of the sample at less than 40%
using an inline heater and gently heating the airstream. The umac (pronounced
micro-mac) is responsible for data acquisition and control.
A document describing the stack heater design is described here. This heater gently heats the sample stream to help lower sample humidity.
Another ‘touch-up’ heater is deployed directly upstream of the impactor box to lower the humidity of the sample air to <40%.
|Laptop, umac and humidity controller|
|Power lights on umac
Temperature and humidity readouts on humidity controller
|Reset button on umac
Power lights on humidity controller