ADS Environmental Services PrimeProbe2 QR 775016 A0 - Manual (Page 30)

PrimeProbe2 User Manual
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 Tpul2 Represents the duration of the pulse generated on Channel-
2. Set up the same way as Tpul1.
Note: Setting the Imp1/Imp2 and Tpul1/Tpul2 incorrectly may
result in sending erroneous signals to the external device.
Measure
 Tconst=s Effects the response time between the measured value
and the displayed/output value.
 Cut-off = % Represents the low-flow threshold. Its nominal
value is a percentage of Full Scale (set for Fs1 in the Scales sub-
menu ). When the flow rate drops below this value, the flow is
assumed to be zero and totalizers and output respond accordingly.
This value can be set from 0 to 25% (of full scale).
 AutoCal = Represents the auto calibration feature and toggles
between On and OFF. When enabled, the PrimeProbe2 performs
an auto-calibration cycle once every hour. The procedure lasts
from 9 to 15 seconds. During this period, the flow rate is frozen,
but not lost. This means that during the autocal process, the
PrimeProbe2 registers the same flow rate as the last reading taken
before the autocal process began. Use auto calibration to remove
temperature-induced errors and at locations that experience large
temperature variations.
 Autorange= Allows the PrimeProbe2 to switch automatically
from the Fs1 to Fs2 range (N.1 to N.2). This function is useful for
pipes with large variations in flow rate. Fs2 must be set at a greater
value than Fs1. Toggle this feature On and Off. Any external
device connected to the PrimeProbe2 must acknowledge changes in
range.
 E. saving Represents an energy saving feature and works in
conjunction with the time constant. The default setting is ON.
This allows for 5-second sampling intervals.
If turned off, the probe will sample at 20Hz, which may cause rapid
battery depletion. Use only when connected to a mains power
source.
Alarms
Typically, PrimeProbe2 users will connect the instrument to an ADS data
logger, using both outputs (one for forward flow; one for reverse flow).
Under this configuration, the data logger (not the PrimeProbe) will
manage the threshold alarms.
If the user chooses not to use the PrimeProbe2
’s alarm capabilities, the
user must allocate one of the outputs (typically, OUT2) for this task. The
Alarm menu contains the following: