RKI Instruments SDM-2012 Standalone Configuration - Manual (Page 22)

17 • Setting the Operational Parameters in Edit Mode
Air Sample Time (AIR)
The air sample time can be set separately for bump testing and calibration. It is the
length of time that the SDM-2012 will draw air through the AIR fitting on the back of
the docking station. Air is drawn during a bump test or calibration before an air adjust
operation and to purge calibration gas from the system after calibration gas has been
drawn through the GAS 1 or GAS 2 fittings on the back of the docking station.
Calibration Gas Sample Time (GAS)
The calibration gas sample time can be set separately for bump testing and
calibration. It is the length of time that the SDM-2012 will draw calibration gas through
the GAS 1 or GAS 2 fittings on the back of the docking station during a bump test or
calibration.
Bump Test Check Tolerance (CHE)
The bump test check tolerance only applies to bump testing. It determines how close
the instrument gas reading must be to the calibration gas concentration for each
channel during a bump test in order to pass the bump test. It is defined as a
percentage of the calibration gas concentration.The amount that the instrument gas
reading differs from the calibration gas concentration must be equal to or less than
this percentage of the calibration gas concentration. For example, if the tolerance is
set to 50%, and the %LEL calibration gas concentration is 50% LEL, then the bump
test gas reading for the LEL channel on the instrument must be 50 %LEL ± 25 %LEL.
Automatic Calibration (CAL)
Automatic calibration only applies to bump testing. It can be set to on or off. If it is set
to on, then the docking station will automatically perform a calibration if a bump test
fails.
NOTE: If the Bump Test Function in the instrument is turned ON, the
instrument’s Setup Mode setting for AUTO CAL takes precedence over
this setting in the SDM-2012. If the SDM-2012’s CAL setting is set to
OFF but the instrument’s AUTO CAL setting is set to ON, a calibration
will still automatically be started after a failed bump test.
Bump Test Check
Tolerance CHE • ± 10%
• ± 20%
• ± 30%
• ± 40%
• ± 50% 50% n/a
Automatic
Calibration CAL • On
• Off Off n/a
Table 3: Bump Test & Calibration Parameter
Parameter
Display
Tag
Available
Choices
Bump Factory
Setting
Cal Factory
Setting