Ultima MOS-5 Detector
20
Apply and remove the magnet, to return to the next level of the setup menu. When “
Fi
” is
displayed again, apply and remove the magnet, the unit will go to calibration mode.
The
display
will flash the remaining sensor life for a few seconds. Ensure that the sensor is seeing clean air
during this time. Apply the calibration gas concentration to the sensor (50% FS of the desired
range of H
2
S.
*See notes section below.
). The display will change from “
AC
” (Automatic
Calibration) to “
CP
” (Calibration in Progress) indicating that the sensor is responding to the
calibration gas.
After 3 to 5 minutes, the display will change from “
CP
” to “
CC
”,
indicating that the
calibration is complete. Remove the gas and wait for the unit to return to normal operation. The
unit is now calibrated and the new span value has been stored in the non-volatile memory
(EEPROM).
If a fault occurs during this process, please refer to the notes section below.
NOTE:
When the sensor range is changed, the warning and alarm set points are automatically
scaled to the new range. The unit must now be calibrated to the new range (Section
4.7.1). The Sensor Range and the Alarm/Warning set points will remain at the previous
setting if the calibration is aborted, faulted, or the power is cycled before the calibration
is completed.
It is recommended to go back through the SE mode to confirm range and sensor set-
points have been changed correctly.
Changing the sensor range will require that the
operator change the H2S concentration previously used for calibrating the unit. It is
necessary to use 50% of the "new" full scale reading when changing the scale, as well
as after the scale is changed during normal calibration maintenance periods (i.e.
10ppm for a 0-20ppm, 25ppm for a 0-50ppm and 50ppm for a 0-100ppm).
It is
important to note that changing a unit’s range may require changing the sensor
to match the new sensor range. (-1 sensor for 0-100 ppm, -5 sensor for 0-50 ppm,
and -9 for 0-20 ppm).
Once the operator reaches the calibration mode, the operator will have 12 minutes to complete
a calibration. If the 12 minute timeframe elapses and the calibration is not complete (unit must
return to "0" reading for calibration to be considered complete), the unit's display will show an
"F2" fault. If this occurs while changing the Sensor Range, the operator must start the Sensor
Range process over until the process is completed properly without any faults being shown
throughout the process. If faults continue during this process, please consult the factory
directly.
4.4.3 Calibration
Output
To enable the calibration output feature of the Ultima MOS-5 Intelligent Sensor, apply the
magnet to the MSA logo on the cover of the unit until “
SE
” is displayed, then remove the
magnet. This puts the unit into setup mode. After a few seconds “
Co
” will be displayed. Apply
and remove the magnet to enter the calibration output setting. The current setting (Enable or
Disable) will then be displayed. To change this setting, apply and remove the magnet
repeatedly until the desired setting is displayed. Once it is displayed, wait three seconds and
“
Fi
” will be displayed. Apply and remove the magnet to return to the next level of the setup
menu. When “
Fi
” is displayed again, apply and remove the magnet to return to normal
operation.
4.4.4 Warning Relay Settings
To adjust the warning relay settings of the Ultima MOS-5 Intelligent Sensor, apply the magnet
to the MSA logo on the cover of the unit until “
SE
” is displayed, then remove the magnet. This
