Revision A
11
3 OPERATIONAL QUALIFICATION
3.1 INITIALIZATION
If the Scanning Probe is being used, connect it to the Scanning Probe Connector and the
Downstream Port. Verify that the Selector Valve is in the CLEAR position. Apply power to the
2H by setting the Power Switch to the 1 (On) position. The following events will occur:
1. The display will show “8.8.8.8.8.”
2. All of the LEDs in the bar graph will be illuminated.
3. The LEDs in the 0, 100, REF, and ALARM buttons will be illuminated.
4. A short beep will sound.
These events indicate that the unit has started and also give the user the opportunity to check the
integrity of all the LED’s. The flow and optics LED’s will be green, yellow, or red. After a few
moments, the firmware revision (main PCB) will be displayed.
Next the screen will go blank and, after a few more moments, another short beep will sound. The
reference light will blink, indicating that it is time to select a reference. Follow these steps to
complete the setup:
1. Press <ENTER>.
2. Use the <Δ> (Up) and <∇> (Down) function keys to select the reference of choice.
3. Press <ENTER>.
4. Use the <Δ> (Up) and <∇> (Down) function keys to select the internal reference factor for
the desired aerosol concentration to display as a 100% value.
5. Press <ENTER>.
The zero LED will begin to blink indicating that it is time to set the zero reference. Ensure that
the selector valve is set to clear.
6. Press <ENTER>.
The bar graph display will indicate that the unit is sampling the zero reference value. Upon
completion, a short tone will sound and the unit will begin sampling and sending data via the
RS-232 serial port.
3.2 SETUP PARAMETERS
The 2H has twelve (12) operating parameters (not counting L0), eight (8) of which are
programmable by the operator to facilitate setting up the instrument for operation. Some of these
parameters have been factory set, but can be optionally reset by the operator. If required, these
parameters can be returned to the factory default setting at any point. Other parameters are
accessible for programming only at the factory. The twelve parameters are listed in the table
below. Valid ranges and default settings for each parameter are also listed, where applicable.
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