14
Control
Mode Description
+1
Begin a new measurement when the digital setpoint is changed.
+2
Begin a new measurement when the valve is being held and the
hold percentage is changed.
+4
Begin a new measurement when the average flow of the last
measurement is read.
The table values may be added together to trigger measurements based on multiple methods
(the value must be an integer between 0 and 7).
Example:
aMT 3
(triggers a measurement for instrument A when either the digital
setpoint is changed or the hold percentage is changed)
Start a Measurement
To start a new measurement
:
unit_id
DVAS
time
time
is the duration to collect data in the measurement, in milliseconds. The measurement
will end when the time has elapsed.
Example:
aDVAS 4000
(starts a measurement with 4000ms collection time)
Measurement Averages and Ranges
The average values or the range of values can be reported over the measurement time
period, for the current or most recent measurement
To return the average flow and temperature
:
unit_id
DVAA
The data returned will be:
unit _ id time avg _ temp avg _ flow
where:
unit _ id
:
The text ID of the instrument.
time
:
The elapsed time that data has been acquired, in milliseconds..
avg _ temp
:
The average temperature during the measurement, in °C.
avg _ flow
:
The average flow during the measurement.
To return the range of temperature and flow values:
unit_id
DVAR
The data returned will be:
unit _ id time min _ temp max _ temp min _ flow max _ flow
where:
unit _ id
:
The text id of the instrument.
time
:
The elapse time data has been taken for this measurement, in milliseconds.
min _ temp
:
The minimum temperature during the measurement, in °C.
max _ temp
:
The maximum temperature during the measurement, in °C.
min _ flow
:
The minimum flow during the measurement, in instrument flow units.
max _ flow
:
The maximum flow during the measurement, in instrument flow units.
Taring the Instrument
Taring adjusts the flow sensor offset so that the current flow value reads zero. This action
gives the instrument a zero reference, ensuring that the instrument provides its most
accurate flow measurements. It is recommended to tare the instrument:
•
After installation
•
If the instrument is hit with any significant impact
•
After any significant changes to the temperature or pressure.
