F:\MARKETING\TECHNICAL MANUALS\Air Samplers\DF Battery TECH MANUALS\DF-75 LPM SERIES.doc
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12
OPERATING FEATURES and INSTRUCTIONS (Cont.)
Keypad Buttons and Their Functions
ON-OFF:
The ON-OFF button is located in the upper right corner of the DFM
module.
Pressing the ON-OFF button while the air sampler is connected to line
power but not running will place the unit in standby mode. Power is
enabled to the DFM.
RESET:
The RESET button is located in the lower right hand corner of the DFM
module.
The RESET button is utilized to start and stop the air sampler motor, to
commence a sampling event or to terminate a sampling event, when
manual on/off is enabled.
Note:
The DFM must be in flow mode for Reset to function as a pump
On-Off button.
The accumulated elapsed time and accumulated total volume are not
automatically reset to zero when the air sampler is started. This feature
allows the operator to temporarily suspend sampling for maintenance, to
implement a different set up, or to enable different features.
Note:
In Time display mode, the RESET button zeros the elapsed time.
In Total Volume display mode, the RESET button zeros total volume.
UNITS:
The UNITS button is located on the right side of the DFM module.
Pressing the UNITS button enables an operator to display flow, elapsed
time, or total volume by advancing the green LED to the different
positions.
The default position of the green LED is the Flow position upon start up or return to power after a
power outage.
Pressing the UNITS button once moves to the Elapsed Time (
time
) position displayed
in HHH:MM (Hours-Minutes mode).
Pressing the UNITS button when the green LED is in the
time
position advances to the
total volume
position.
NOTE:
Do not assume that total volume and elapsed time are zero when flow is zero.
Check both the elapsed time and total volume values prior to commencing a sample
event.
