Carbolite ABA 7/35B - Manual (Page 32)

32 MF60 – 1.04
Home Screen → Main Menu → Calculate Tray Lift.
The air flow through the chamber causes lifting of the sample tray and balance; the amount of
lift should be measured after installation and should be checked from time to time.
Load the chamber with an empty sample basket assembly and catch tray, after it has reached
its normal running temperature (e.g. 500°C). Allow the baskets to heat up for 10 minutes.
The main chamber temperature is displayed on the screen for convenience. If the temperature
is below 100°C and a calculation is attempted, an error message pops up.
When the Calculate Fan Lift button is pressed the ABA automatically performs the following
sequence:
1. Stop the extractor fan
2. Tare the balance
3. Start the extractor fan
4. Wait for the system to stabilize
5. Take a weight measurement and store the result in flash memory
6. Stop the fan
7. Indicate the calculation is complete
8. Write a message to the Event Log
A progress bar shows the relative status of the calculation and when the procedure has finished
the word Complete appears across the bar and the yellow back arrow changes to a green tick,
ref Screen-view: 8.1.12
The calculation can be repeated as many times as required.
When a test is run the lift correction factor will automatically be applied.
9 Access Levels
9.1 Setting Operator and Supervisor Access Levels
Selected buttons have user access configured at different levels. Access control is split into
three levels: Configuration Level, Supervisor Level and Operator Level. Setting the access level
for the Configuration and Supervisor levels is pass-number protected and is changed on the
access control Screen 9.1.1, This screen is accessed via:
Home Screen → Main Menu → Select Access Level.
The default pass code number for Supervisor Level = 2222
Supervisor and Operator access is controlled using a system configuration file which is held in
the flash memory on the controller. Changes to this file can be requested and a new copy
uploaded to the system from a USB memory stick. The default settings for this file are shown in
Table 9.1:1.
If an operator presses a button for which they do not have adequate privilege, then an
‘Insufficient Privilege’ message pops up.