E+E Elektronik EE33, User Manual

Page: 24 / 40

24
EE33 Humidity / Temperature Sensor for High Humidity and Chemical Applications
Switching parameters:
EE33 Type T5/8/10/17 EE33 Type T7
freely selectable between
RH Relative humidity

T Temperature

Td Dew point temperature
 
Tf Frost point temperature
 
Tw Wet bulb temperature

e Water vapour partial pressure

r Mixture ratio

dv Absolute humidity

h Specific enthalpy

Tab. 1 Option AM2 selectable switching parameters
8.3 Integrated Power Supply (Option AM3)
AC power supply with 100 - 240 V is possible with this option.
Please refer to chapter 6.4 for electrical connection details.
9 Humidity / Temperature Calibration
The EE33 sensor can be calibrated in two ways:
1-point humidity/temperature calibration: quick and simple calibration on a defined humidity/
temperature point (working point).
2-point humidity/temperature calibration: calibration for accurate measuring results over the entire
humidity/temperature working range.
ƒ
To reach a temperature balance it is recommended to keep the transmitter and the reference
chamber (e.g. HUMOR 20,...) for minimum 4 hours in the same room.
ƒ
During stabilisation period and calibration procedure it is important to keep the temperature constant
in the reference climate chamber.
ƒ
For calibration the humidity sensor probe must be stabilised at least 20 minutes into the reference
chamber.
ƒ
Replace a used dirty filter cap before calibration!
Calibration may be performed
ƒ
With the help of the EE-PCS. The EE-PCS leads the user through the procedure step by step.
ƒ
Using the pushbuttons directly on the circuit board. The according procedures are explained below.
9.1 2-point Humidity Calibration
For accurate adjustment over the entire humidity working range a 2-point calibration is recommended.
ƒ
Start calibration at the low humidity calibration point!
ƒ
The humidity difference between the two points should be > 30 %RH
ƒ
Low humidity point < high humidity point