Super Systems MGA6000 - Manual (Page 16)

SSi Manual #4563 Rev. D Page 16 Multi-Gas Model 6000
Note about delays: The delays are entered in tenths of a minute, i.e. twenty tenths equals two minutes and
five tenths equals thirty seconds. If the user enters a 2, this will be displayed as 0.2. If the user enters a
20, this will be displayed as 2.0. If the user enters a 200, this will be displayed as 20.0.
Example – The following will show how to set up the sampling parameters of: minimum temp – 1500,
minimum millivolts – 1200, minimum millivolts stops the pump – yes, maximum adjustment – 1, maximum
COF/PF – 250, minimum COF/PF – 75, IR mode – Monitor, on delay – 10.5 seconds, off delay – 5 seconds,
update interval – 1 minute, sample delay – 5 seconds. When the menu screen first displays, the minimum
temp field is already highlighted. Enter a 1500 and press Enter. Press the down arrow key once to
highlight the minimum millivolts field. Enter a 1200 and press Enter. Press the down arrow key once to
highlight the minimum millivolts stops the pump field. Enter a 1 and press Enter (Note – the screen will
display YES). Press the down arrow key once to highlight the maximum adjustment field. Enter a 1 and
press Enter. Press the down arrow key once to highlight the maximum COF/PF field. Enter a 250 and press
Enter. Press the down arrow key once to highlight the minimum COF/PF field. Enter a 75 and press Enter.
Press the down arrow key once to highlight the IR mode field. Enter a 0 and press Enter (Note – the
screen will display Monitor). Press the down arrow key once to highlight the on delay field. Enter a 105
(delays are entered as tenths of a minute) and press Enter (Note – the screen will display 10.5). Press the
down arrow key once to highlight the off delay field. Enter a 50 and press Enter (Note – the screen will
display 5.0). Press the down arrow key once to highlight the update interval field. Enter a 1 and press
Enter. Press the down arrow key once to highlight the sample delay field. Enter a 50 and press Enter
(Note - the screen will display 5.0).
IR Cell Zero Calibration – Menu Page 18
This page is used to perform a zero calibration on the IR cells. It
is very important to be sure that the sample gas is a good zero
especially for CO2, when CO2 is one of the gases that is being
monitored. Ambient air has nominal percentage of CO2, which
should not be present when performing a zero calibration. It is
recommended that 99.9% pure nitrogen be used for zeroing the
MGA6000. The sample gas flow rate should be between 1 and
1.5 SCFH.
When viewing this screen, the current measured values are
shown at the left under the heading
Actual , while the desired
values will be in the center column, Zero Gas . The final column
is Status , and this shows the percentage difference between the actual and desired values, followed by a
comment. This comment can either be OK, ?OK, or BAD, depending on how far apart the values are. If
the difference is between 0 and 10% of the span value, then it will be OK and the calibration will proceed
without interruption. If the difference is between 10% and 20%, it will be ?OK, and a warning message will
be displayed. Pressing Enter will allow the calibration to continue. If the value is more than 20% out, it will
be BAD and the calibration will not be allowed to proceed. If this occurs, check to make sure that the
correct gas is being used and that there is adequate flow. If it is still not operating properly contact SSi for
additional support.
It is possible to calibrate one, two, or all three sensors. The default setting is to calibrate all three. To set a
sensor to not be calibrated, use the up or down arrow keys to highlight the YES next to the specific sensor
and press Enter. This will change the display to NO, and that sensor will not be calibrated.
To proceed with the calibration of one or more sensors, use the arrow key to highlight the Start and press
Enter. Timers will count down approximately two minutes and at the conclusion the sensors will be
calibrated.