Installation and Operation
AMI
Analyzer Manual
14
Front Panel Settings and Adjustments
General Description:
This analyzer is designed to be as simple to operate as possible. The analyzer displays the Hydrogen sulfide
level in ppms on the LCD. Meanwhile the analog output and the alarms are set on a single (user selectable)
range.
For example, you can set the analog output to correspond to 0-100ppm, and the alarms to be, for example,
40ppm for Alarm 1 and 50ppm for Alarm 2 (i.e. 40% of range and 50% of range), activating above set point.
Be aware that if you then change the output range to 50ppm, the alarm set points will automatically change
to 20ppm and 25ppm respectively. For this reason, set the output range first and then set the alarm set
points.
Only output ranges of 0-50ppm and 0-100ppm are allowed, since the sensor cannot tolerate higher levels of
hydrogen sulfide.
The unit provides the basic controls through the front panel, and more advanced controls are available
through the user interface program (see below in the Advanced Features and Communications section. If
you are going to set up the analyzer using the advanced computer interface, you can skip this section.
Security:
Through the user interface, three levels of security can be set. These are: No security (all front panel
controls work), Span (only the span control and the alarm hold off button are allowed to operate), and Full
security (only the Alarm hold off button performs a function, though other buttons will show settings but
won’t allow them to be changed). If the front panel controls don’t seem to work, use the AMI User
Interface to change the security settings.
Front Panel Controls:
The controls all work the same way. You press the
function you want for a second, and let go, and the
display will show the value corresponding to that
function, for about 3 seconds. For example, if you press
the OUTPUT RANGE button for a second, the display will
show the full scale output range. You can change this
value (if the security setting allows) by then pressing the
UP or DOWN arrow button. You can either press this
once for a small change, or you can hold it down , in
which case the number will change slowly at first, and
then faster. If you overshoot your target, press the
other button to go back, and the display will again start
moving slowly.