GMI GDUnet, User Handbook Manual

Page: 58 / 122

USER HANDBOOK
3-32
3.6.1.4 Purge Time
By default, gas purge time is set to 30 seconds.
To override this setting, i.e. disable feature, un-tick the ‘Default’
box .
To adjust the Time Value, use arrows. Value can be adjusted
from 15 to 120 seconds.
3.6.1.5 Leak Checking
During the Test / Calibration process, both instrument pump and
gas supply are stopped simultaneously. A leak test is performed
while gas is trapped in the instrument.
If the Volume Gas reading drops by a level greater than ‘% Delta
Allowed’, the instrument records a ‘Fail’ condition.
To adjust the % Delta Value, use
. Value can be adjusted
from 0 to 20%.
Time value, in seconds, relates to the duration that the pump
and gas supply is temporarily halted.
To adjust the Time Value, use
. Value can be adjusted from
0 to 20 seconds.
3.6.1.6 Default Conversion Factors
The value (factor) displayed in each calibration gas type window
represents 100% LEL of that particular gas type.
This value can be edited if your company policy dictates
adjustment to a specific value that your company has determined
equates to 100% LEL.
To adjust the default conversion factors, use to display option
values for each gas type.
3.6.1.7 Password
The preferences dialogue box, illustrated in Fig. 3-40, is password
protected to prevent users modifying test / calibration parameters.