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GrainPro
®
Carbon Dioxide Analyzer Instruction Manual
MA4068RAD0718 - 2
8.2. Span
Calibration
Span Cal Fail
Re-enter into the calibration mode, zero the
instrument (optional in case of last successful
zero calibration & can be skipped by pressing
Set Key
) and repeat the same procedure as
explained in 5.8.2 Calibration Process, (f) or
send to factory.
8.3. Pump making
abnormal noise
There may be a blockage in
the gas sampling tube or in
the nozzles
Clear blockage
8.4. The instrument
does not turn On
Low battery
Recharge Battery
8.5. Sensor Drift
Count value is lower than 500
which is the ideal value for an
open atmosphere.
1. Conduct purging twice. If sensor drift still
appears, do the next procedure.
2. Press Set Key then Up Key for setting. Enter
the password, 999 and check the counts
(CNTs) value, ideally 500. If it is <500, adjust
the zero pot at the back of the instrument.
Then press Set Key to go back to the main
menu.
8.6. Problem on
Serial Port
Connection for
Linux
If a message pops up
“Cannot open ****:
Permission denied”
when
you open the software or
open the port in control
signals.
O
pen the Ubuntu’s terminal software.
1. Type in the command
groups
to check if ”tty”
and “dialout” is among the user’s group.
2. If neither is in the groups add both. (If only one
is missing, only add that one)
3. To add tty type in the command,
sudo
usermod -a -G tty [USERNAME]
and press
