Operation
EGM-4 Operator's Manual – Version 4.19
- 23 -
PP Systems Environmental Sensor Conversions:
The following conversions need to be made to determine actual measurements of PAR, %RH
and temperature when using PP Systems’ environmental sensors.
PAR Sensor
mV x 3 = PAR Level (µmol m
-2
s
-1
)
%RH Sensor
mV / 10 = %RH
Temperature
mV / 20 = Temperature (˚C)
To return to the Main Menu while in Measurement Mode, simply press the N key.
Steady State Porometer (Probe Type 7)
Immediately after pressing key 1, the instrument will display the following message to allow
the sensors to time for alignment (
Display 1
):
After approximately 3 seconds, the following is displayed to allow entry of record and plot
number if required (
Display 2
):
Where:
REC
Record Number (up to 9999).
PLOT
Plot Number (up to 99)
03-04
Date (3
rd
day of April)
12:40
Time (12:40 PM)
Note.
If the plot number needs to be changed, press key N when Display 2 above is shown
and enter the plot number desired. Next, press the Y key to continue. To return to Display 1
press key 8/X twice. Only the plot number can be changed at this point and the record
number automatically resets to 1 when the plot number changes.
To proceed to the Measurement Display, press the 8/X key
(Display 3):
Where:
I
Inlet Relative Humidity (%RH)
O
Outlet Relative Humidity (%RH)
T
Porometer Temperature (
˚C)
Q
PAR (µmol m
-2
s
-1
)
F
Flow Rate (ml/min)
G
Stomatal Conductance (
mmol (H
2
O) m
-
²
s
-
¹
)
The stomatal conductance calculation uses an exact determination of the energy balance.
To return to the Main Menu while in Measurement Mode, simply press the N key.
REC 0001 PLOT 00
03-04 12:40
KEY 2 = HUMIDITY
SENSOR BALANCE
I 22.3 O28.4 T22
Q1645 F245 G 0234
