8 Taring
Taring your Device
Taring ensures accurate measurements by giving the device a zero
reference. The taring process takes 10 seconds to complete once it begins.
Prior to taring, flow fluid through the device and then stop flow to establish
a no-flow condition while there is fluid present throughout the instrument.
For best results, allow the electronics and the flow 15 minutes to reach a
steady state temperature before taring.
How to Tare
There are three ways to communicate a tare command to a CODA KM-Series
mass flow meter.
Tare via Analog
Every KM-Series meter has one pin that can be grounded to tare the
device. Simply apply a good ground to this pin for at least 5 seconds to
initiate the 10-second taring process (
).
Tare via Serial
CODA KM-Series meter can be tared by pushing the “Zero Device” button
in Alicat’s CODA View program (
). Once this button is pressed,
the program will indicate that a tare is in progress. Do not start flow again
until this process is complete. For taring via Modbus RTU serial protocol,
please see Table 4 (
).
Tare via Button
While not recommended, the device can also be tared by pressing the
tare button on the top of the device for 5 seconds to begin the 10-second
taring process.
!
Warning:
Tare via the top button may result in an
improper tare due to disturbance of the measurement
tube caused by pressing the button.
✓
Note:
Devices with IP67 rating will not have a tare button.
When to Tare
•
After installing the meter in a different orientation.
•
After a significant impact to the flow meter.
•
After changing fluid.
