Blue-White Sonic-Pro Hybrid Ultrasonic Flowmeters - Manual (Page 52)

Page 52 Sonic-Pro
Industries, Ltd. Industries, Ltd.
ProSeries
by Blue-White Ind.
TM
If the flowmeter is fitted with the Process Control Board, three Process Control Status
Areas appear on the display under the secondary display area and above the soft button
labels. The Model S2, Model S3 and the User PC Software display is the same. Each area
is labeled with the relay number to which it refers and shows the status of that relay
channel. If a relay channel is disabled in configuration, the corresponding status area
will be blank.
For channels configured to monitor flow total, the Process Control Status Area shows
IDLE, ACTIVE or PAUSE, corresponding to the state of the channel. ACTIVE is
displayed in white-on-black. For detailed information on the operation of relay channels
monitoring total, see section 8.2 below.
For channels configured to monitor flow rate, the Process Control Status Area shows
ALARM or CLEAR. ALARM is displayed in white-on-black and corresponds to the
channel states ALARMING, ALARMED and CLEARING (that is, when the flow rate
is outside the set limits or an alarm condition has been latched, whether the relay itself
is energized or not). CLEAR is displayed in normal black-on-white and corresponds to
the CLEAR state of the channel, when the flow is within the limits and no alarm is
latched. For more information about channel states, see section 8.3 below.
In addition to the SWAP and CLEAR soft buttons, discussed above, two other soft
buttons will be present under certain circumstances. Buttons that are not present appear
blank.
The SETUP soft button will be present on Model S3 and also at a User PC Software
connection if fitted. Pressing the SETUP soft button causes the flowmeter to enter
Setup Mode and the Setup Mode Screen replaces the Run Mode Screen, see section
6 above for details. Operation of the flowmeter is immediately disrupted as flow
measurement does not take place in Setup Mode.
The RELAY soft button will also be present if the conditions above for the SETUP soft
button are met and the Process Control board is fitted but not if all relay channels are
disabled in configuration. Pressing the RELAY soft button causes the Process Control
Screen to replace the Run Mode Screen, see section 8.1 below for details. The
flowmeter at first continues to operate normally, although the user can no longer see the
information displayed on the Run Mode Screen, but some actions that the user can
take on the Process Control Screen will disrupt measurement.
The flowmeter provides two output signals that represent the flow rate. An analog output
represents the flow rate as a current amplitude. A digital pulse output represents the
flow rate as a pulse frequency. These signals will have their values (current and
frequency) changed to the same values and at the same period as the flow display. In
other words, they are affected in the same way by the configured averaging time, display
update period and cutoffs.
The analog signal output has a current range of 4 to 20 mA. The correspondence of
current to flow rate can be configured by specifying two (flow rate, current) points. Low
and high flow rates, which must not be the same, are specified and the currents
corresponding to each are given. Other flow rates are mapped to currents using a
straight line through the points specified. The current for the high flow rate may be
smaller than the current for the low flow rate, in which case the current will decrease
with increasing flow rate. Flow rates mapping to currents outside the available range
will cause the signal to saturate at the closest limit.
7.3
Process
Control
Status Areas
7.4
Soft
Buttons
7.5
Output
Signals
7.5.1
Analog
Signal
Output