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versus when it is full. The tank itself may also not be perfectly manufactured and may, for instance have
walls that are not perfecty straight. All of these errors could add together such that the final system is less
accurate than expected. To achieve a more accurate system, a calibration can be performed. In this exam-
ple, the tank could be calibrated by adding a small amount of liquid, say 10 litres (low Y) and noting the
value reported by the ORB (low X). Now fill the tank by adding another 99 litres (high y) and note the
value being reported by the ORB (high X). By filling the high and low X and Y values into the calibration
constants associated with analog mode, offset and non-linearity errors can be eradicated, resulting in a
much more accurate system.
Warnings and Alarms In analog mode, frequency mode and duty-cycle mode, warning and alarm thresholds
for can be set. Once enabled, each time a measurement is completed, the returned value will be
compared with minimum and maximum warning and alarm thresholds. If a warning or alarm level is
breached, a message will immediately be transmitted. As long as the warning or alarm condition persists,
messages will be transmitted at the exception-interval rather than the transmit-interval.
Note If calibration has been applied, then the warning and enable thresholds are in the calibrated units.
Pulse counting
In all modes, the number of pulses that have occurred since the ORB was last reset can be measured and
reported. To enable the counting of pulses, enable the pulse option. If for instance, a flow-sensor is being
used to deliver fuel to a vehicle, the instantaneous frequency would represent flow rate (possibly in litres
per minute) and the number of pulses would represent the total amount of fuel delivered (possibly in
litres). When pulse counting is enabled, the ORB remains awake, continuously monitoring the input in
order to capture all the pulses that occur.
The count can be set to reset after a number of pulses have been counted. This may be useful, for instance
if a sensor is measuring water in litres, and only kilolitre indications are required. In this case, a pulse
warning level can be set at 1000 pulses at which time a transmission will be made and at the same time,
the counter will be reset. One transmission will be made for each 1000 litres of water measured.
Note Because pulse counting keeps the input active, there will be an increase in power consumption.
In the diagram below, a flow sensor with integrated reed-switch is connected to input 1 to allow the
number of pulses occurring to be measured.
Figure 6.10. Flow sensor connection
A full list of settings for the inputs is given in the table at the end of this chapter.
ORB User Guide, Release 1.1
6.4. Thermocouple Interface
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Страница 110: ...Figure 10 2 Dimensioned side view ORB User Guide Release 1 1 104 Chapter 10 Mechanical Speci cation...
Страница 111: ...Figure 10 3 Dimensioned side view including mounting brackets ORB User Guide Release 1 1 10 1 Mechanical drawings 105...
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