PureAire Monitoring Systems, Inc.
3 |
P a g e
1.1.3 Calibration
The
Air Check
✓
O
2
monitor incorporates a stable zirconium oxide sensor that rarely requires
adjustment. Changing barometric pressure changes or changes in temperature and humidity do
not affect the zirconium oxide oxygen cell. The earth is a wonderful source of calibrated
oxygen at 20.9%, therefore under ambient conditions, visual verification of the
Air Check
✓
O
2
monitor to 20.9% oxygen is easily performed. There are no zero or span pots to adjust. The O
2
monitor only requires periodic testing with nitrogen to verify the cells response to low oxygen
levels. See Section 6.2 for the testing procedure to nitrogen.
1.2 Component Identification
1.2.1 Front View Exterior
1.
Front Cover
— This is a removable, waterproof cover that protects the
interior of the transmitter. It fastens through 4ea. captive screws
2.
Joystick
— Used for selecting and adjusting the built-in menus. The
Air
Check
✓
O
2
Sample draw monitor has dual level user selectable alarms.
3.
Digital Display
— This displays the Oxygen levels in percentage. The
normal oxygen level on earth is 20.9%
4.
Front Cover Fasteners
— The
Air Check
✓
O
2
Sample draw monitor has
4ea. captive screws to remove the front window from the base unit.
5.
Sample Inlet
— This inlet permits the flow of oxygen to enter the sensor
cell.
Front Cover
Alarm and Fault
Relays
Mounting Feet
(4ea.) not shown)
Sample Inlet
Digital Display
Joystick
Front panel
fastening
screws (2 ea.)
Front Cover
Fasteners
(4ea.)
Sample
Exhaust
Cable Strain
Relief
