H300P Temperature Humidity Chamber
Page 7
Principles of Operation
The H300P temperature humidity chamber controls the humidity by circulating the air inside the chamber
through the desiccant to decrease humidity, or through a water vapor chamber to increase humidity.
Air entering the chamber from the desiccant is very close to 0%RH. Air entering the chamber from the vapor
chamber is close to 100%RH. A fan inside the chamber mixes the dry or humid air to maintain uniform
humidity level throughout the inside of the chamber.
The humidity is controlled by regulating the amount of dry or humid air that enters the chamber.
The temperature inside the chamber is controlled using a solid state Peltier element. The chamber does not
contain any refrigerants.
Chamber Control and Operation
Summary of Operations
1.
Turn the
CONT
switch OFF.
2.
Turn the
POWER
switch ON.
3.
Enter the desired setpoints (or profile) on the PM PLUS Controller, using the numeric slider or the
+
or
–
keys.
4.
Load your test sample in the chamber and close the chamber door.
5.
Turn the CONT switch to ON.
Controls
The H300P chamber has three switch button controls:
POWER
: Turns the chamber power On and Off.
CONT
: Turn the chamber control On and Off.
LIGHT
: Turns the LED lights inside the chamber On and Off.
The temperature and humidity set points are adjusted by setting the appropriate controller. Humidity is on
the top, Temperature is on the bottom.
The
CONT
switch allows you to turn off both temperature and humidity control to the chamber without
changing the target set point of either controller. Both controllers and the chamber will still be On, but no
power will be supplied to the temperature and humidity control units inside the chamber. This switch is
useful when you need to open the chamber door.