Analytical Industries AII-2000 M Oxygen Analyzer - Manual (Page 9)

4.6 Alarms AII 2000M Oxygen Monitor
The monitor is equipped with user selectable HI and LO alarm set points
which are displayed at the bottom of the LCD. The default alarm set points
are 15% LO and 50% HI. The LO alarm set point can be set between 15%
and 99% and the HI alarm set point can be set between 16% and 100%.
Alarm set points may be adjusted in 1% increments by pressing and holding
the UP/ DOWN ARROW keys, see below. The ARROW keys are disabled when
the alarm set points are within 1% of each other to prevent the HI alarm from
being set below the LO alarm. The HI alarm may be disabled by attempting to
select a HI alarm set point above 100% to facilitate flushing patients after
anesthesia. In this mode the LCD continually displays HI OFF.
The AII-2000 M Oxygen Monitor is equipped with four (4) indicators that acti-
vate when oxygen concentrations are 0.1% below the LO alarm set point or
0.1% above the HI alarm set point.
1. LCD alternates between the ALARM mode with an oxygen reading 0.0%
and recommendation as illustrated in sections 4.5.2.1 and 4.5.2.2
2. Alarm value and background alternately reverse color on LCD
3. Red LED below the alarm value lights up and begins flashing
4. Audible alarm begins beeping
4.6.1 Setting Alarm Set Points
1. From the SAMPLING mode press MENU
to display the MAIN MENU
2. Press the UP/DOWN arrow keys to
highlight SET ALARMS
3. Press ENTER to select SET ALARMS
4. LO alarm value is highlighted by default
5. Press ENTER to skip the LO alarm (and
proceed to the HI alarm) or press the
UP/DOWN arrow keys to change the
alarm set point
6. Press ENTER to save LO alarm set point
and move to select the HI alarm
7. Press ENTER to skip the HI alarm (and
return to SAMPLING mode) or press the
UP/DOWN arrow keys to change the
alarm set point
8. Press ENTER to save HI alarm set point
and return to SAMPLING mode
9. If no key is pressed within 5 seconds,
the LCD returns to the SAMPLING mode
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4.7 Calibration
Electrochemical oxygen sensors generate slightly different signal outputs under
identical conditions due to variations in the thickness of the sensing membrane
and manufacturing process.
Simulate the application for optimum accuracy: Review Sections 3
Safety Warnings and 5.2 Application Considerations before proceeding.
The devices are designed to meet the requirements for both ambient
and elevated oxygen measurements but should NEVER be calibrated
with air or 21% oxygen with the intent of taking oxygen measurements
at oxygen levels above 30% oxygen.
Accordingly, the devices may be calibrated with either air (20.9%) or
100% oxygen which requires the user to make a conscious decision to
bypass or skip the recommended 100% oxygen calibration.
Set-Up:
AII-2000 A and AII-2000 M refer to section 5.4.1 Flowing Gas
Streams or 5.4.2 Static Atmospheres.
AII-2000 HC refer to section 5.4.3.
15
20.9 %
SAMPLING
LO 15% HI 50%
MAIN MENU
CALIBRATE
SET ALARMS
ALARMS AUDIBLE
LO 15% HI 50%
SET LOW/HIGH ALARM
USE UP/DOWN ARROWS
TO ADJUST VALUE
TO SKIP - PRESS ENTER
LO 15% HI 50%