Michell Instruments QMA601, User Manual

Page: 40 / 112

QMA601 User’s Manual
30 97449 Issue 3, June 2018
OPERATION
Parameter Description
Calibrate
Starts a calibration procedure if a manual calibration has been selected.
Analog O/P
Hold
Toggles data hold mode. This determines whether the last valid
measurement is held while a calibration is carried out.
Available Options: On, Off
If data hold is selected, the user can select how many cycles, after the
calibration, the last measured value is held for.
Cal Source
Toggles between an external calibration source or the internal
calibration source. If an external calibration source is selected the
external reference moisture must be entered in the ext ref setting.
Available Options: External, Internal
External Cal Source -
when this is chosen
Ext Ref
will need to be
entered to show the ppm
V
value of the external moisture reference.
Internal Cal Source -
when this is chosen then the Cal Method can be
set to Manual or Automatic.
Cal Method
Toggles between manual calibration or automatic calibration mode.
Available Options: Automatic, Manual
Manual Cal Method
- if this is chosen the Start button must be
pressed in order to initiate the calibration procedure. If this method
is chosen then both the Interval and Hour selection boxes are hidden
and a Start button is displayed.
Automatic Cal Method
- if this is chosen then the following parameters
will need to be set and will be displayed on the screen. Calibration will
begin on the time selected using the interval and hour settings.
Interval (Days)
Frequency of automatic calibrations in days.
Hour
The hour in the day at which an automatic
calibration will start.
Settling Cycles
Period of time for the QMA401 to stabilize to the
new moisture level (as presented by the internal
moisture generator or external ppm value)
before conducting the actual calibration cycles.
Cal Cycles
Sets how many calibration cycles are carried out.
Table 7 Calibration Screen Parameters