Met One Instruments LVS-100, Руководство пользователя

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MicroVol-1100 User manual 1.6 Operation
timer settings), then the MicroVol pump will operate and sampling will take
place. Once this condition is satisfied, the MicroVol will sample for at least
40 seconds. This time delay prevents rapid on/off cycling if the wind
condition is borderline. To over-ride wind conditional sampling, or if there is
no wind sensor connected, set the parameter values as shown so that the
wind conditions are always satisfied.
See section 2.1.1 for more information on wind sector set-up.
Set Counter-clockwise wind direction (
°
)
Set Clock-wise wind direction (
°
)
Set Low wind speed limit (m/s)
Set High wind speed limit (m/s)
Figure 19 Wind Menu
3.3.2.3 Trigger Setup Menu
The Trigger menu appears as follows:
Set trigger voltage range lower limit (V)
Set trigger voltage range upper limit (V)
Set sampling period in hours:minutes
Set retrigger mode YES/NO
Figure 20 Trigger Setup Menu
The trigger works in conjunction with other conditional parameters. Check
other Setup menu parameters to ensure they don’t interfere with the Trigger
program (for example Times and Wind settings.) Likewise, if external
triggering is not required, set the trigger parameters so that they do not
interfere with other programs. The external trigger can be disabled by setting
Trigger Lo and Trigger Hi to the same value (typically zero.) Setting OFF
Delay to 00:00 will behave as if it were set to 00:01 - it does not disable the
trigger function, and if triggered, the sampler will run for 1 minute. The
RunTime parameter will also increase by 1 minute in this situation.
Note: It is necessary to disable the Wind function if
using the Trigger function to control the MicroVol.
This is achieved by setting the wind direction range
from 0 to 360 and wind speed from 0 to 100 as
described in section 3.3.2.2.
The Trigger Menu contains parameters for specifying an external trigger to
start the MicroVol sampling period.
Example: a separate gas analyser might be used to trigger the MicroVol to
start sampling when the gas concentration reaches a certain alarm level. You
could also use a contact closure (switch or relay) to start and stop the
MicroVol.
CCW W Dir 0
CW W Dir 360
LO W Speed 0
HI W Speed 100
Trigger Lo 0
Trigger Hi 2.
OFF Delay 01:00
ReTrigger NO?
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