Blue-White Sonic-Pro Hybrid Ultrasonic Flowmeters - Manual (Page 53)

Page 53 Sonic-Pro
Industries, Ltd. Industries, Ltd.
ProSeries
by Blue-White Ind.
TM
7.5.2
Digital
Pulse
Output
The digital pulse output has a frequency range of 0 to 1000 Hz. The correspondence of
pulse frequency to flow rate can be configured by specifying two (flow rate, frequency)
points. Low and high flow rates, which must not be the same, are specified and the
frequencies corresponding to each are given. Other flow rates are mapped to pulse
frequencies using a straight line through the points specified. The frequency for the high
flow rate may be smaller than the frequency for the low flow rate, in which case the
frequency will decrease with increasing flow rate. Flow rates mapping to frequencies
outside the available range will cause the signal to saturate at the closest limit.
The flowmeter is able to log flow data internally to a memory buffer and to a removable
SD Card. If the Communication Board is fitted and connected to a PC running the Sonic-
Pro software application, the internal buffer data will automatically download to the
user’s PC hard drive. The generation of a log entry can be triggered periodically, by the
flow rate passing configurable setpoints and by the total flow passing configurable
setpoints. All log entries are identical and do not indicate which of the forgoing
mechanisms caused their generation. All log entries look like this:
2006/12/15 13:10:43 Rate: 2396.25 Total: 4345625.38 Code:
The date is ordered year/month/day. The time is military or European time, so no
a.m./p.m. field is needed. The flow rate and total flow are recorded as they would appear
on the display, u
Up to two error codes will be recorded
if present.
The internal memory buffer can hold approximately 2,000 log entries. The 32 Mbyte SD
card (included) will accommodate about 500,000 entries. At one entry per minute, it will
fill up in a little less than a year. If the SD Card is not present, data logging still takes
place but only entries in the memory buffer can be retrieved, and only by using the User
PC Software application, see section 7.6.5 below.
The interval between periodic log entries can be configured from 1 to 999999 seconds. If
this number is set to zero, periodic logging will not occur. Log entries can only be
generated when flow information is produced for display.
Maximum and Minimum Flow Rate Setpoints can be configured in Setup Mode so that
the flowmeter records the time at which the flow rate crosses these values. A log entry is
generated when the flow rate crosses the Maximum Flow Rate Setpoint value while
increasing. A log entry is also generated when the flow rate crosses the Minimum Flow
Rate Setpoint value while decreasing. These log entries are not distinguished from
other entries and consist, as always, of the timestamp, the flow rate immediately after
the setpoint was crossed and also the total flow at that time.
When a log entry has been generated due to the crossing of a Log Rate Setpoint, as
described here, no further log entries are generated due to the crossing of the same Log
Rate Setpoint for a period of one minute. The intent is to suppress “flicker”, i.e. many
log entries due to the flow rate hovering around the setpoint and crossing it repeatedly.
Log Rate Setpoints must be specified in the units of measure configured for flow rate.
Five Flow Total Setpoint values can be configured in Setup Mode so that the
flowmeter records the time at which the total flow crosses each of these values. When
this occurs, a single log entry is generated. It is not distinguished from other entries and
consists, as always, of the timestamp, flow rate and the actual total flow value that
exceeded the setpoint. Flow Total Setpoint values do not have to be in ascending order.
They must be specified in the units of measure configured for flow total.
nits of measure are not included.
7.6
Data
Logging
7.6.1
Periodic
Logging
7.6.2
Logging
Rate
Setpoints
7.6.3
Logging
Totalizer
Setpoints