Revision A
17
Press the <Δ> (Up) and <∇> (Down) function keys to change the displayed setting between 0 and
120 seconds. Press <ENTER> when done. [L12] will be displayed.
3.4 SETTING UP THE ALARM FUNCTIONS
The 2H has an alarm feature which can alert the user when particle concentration exceeds a user-
selected % Leakage value. To set the alarm features, perform the following steps:
1. After system initialization, press the <ALARM> function key.
2. The ALARM LED will flash and the current alarm setting ([ON] or [OFF]) will be
displayed.
3. Press the <Δ> (Up) and <∇> (Down) function keys to change the displayed setting.
4. If changing the alarm set point is not desired, the <ENTER> function key may be pressed
to return to sampling mode. If this is the case, press <ENTER> and proceed to step 8.
5. If the alarm set point is to be changed or checked, press the <ALARM> function key
again to enter the set point mode.
6. Press the <Δ> (Up) and <∇> (Down) function keys to change the displayed set point.
7. Press the <ENTER> key two (2) times to return to the unit to sampling mode.
8. Setup of the alarm is now complete. When the measured concentration exceeds the set
point, the display with flash. If the audible alarm parameter (L1) is set to ON, a tone will
also be heard.
3.5 CHANGING THE REFERENCE
During the initialization sequence immediately following unit startup, the user is required to select
a reference. To change the desired reference anytime thereafter, perform the following steps:
1. Press the <REF> function key.
2. The REF LED will flash and the display will go blank.
3. Press the <ENTER> function key. If the <ENTER> key is not pressed within about three
(3) seconds, the unit will return to sampling mode.
4. Use the <Δ> (Up) and <∇> (Down) function keys to select the desired reference.
5. Press the <ENTER> function key.
6. Use the <Δ> (Up) and <∇> (Down) function keys to select the desired internal reference
factor.
7. Press the <ENTER> function key.
The zero LED will begin to blink indicating that it is time to set the zero reference. Double
check the selector valve is set to clear.
8. Press <ENTER>.
The bar graph display will indicate that the unit is sampling the zero reference value. Upon
completion, the unit will return to the sampling mode.
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