Sierra InnovaMass 240i Series, Instruction Manual, Page: 49 / 115

49
2. The set-up or installation may be incorrect.
Solution:

Verify the installation:
o
For 240i, make sure nothing is clogging the flow body or building up around
the flow sensor.
o
For 241i, verify insertion depth and meter orientation are correct.

Verify the cabling
o
No power wires in the same conduit as the signal wires. This can couple
noise into the line, especially if powered by AC.
o
No cable splices. If additional cable is added to the meter, this can lead to an
attenuated vortex signal which is of insufficient strength for the meter
electronics to process.

Verify meter is properly Earth grounded.
Temperature Issues
Since mass flow is determined by calculating density from
Temperature and Pressure, this may
cause errors in the flow readings as well.
240i/241i VT and VTP meters have one 1000 ohm PRTD for measuring process temperature.
Temperature ranges:
ST: -40F to +392F (-40C to +200C)
Possible Cause of Error Code
1. Temperature channel calibration is incorrect/ corrupted.
Solution:

Contact Sierra for remote troubleshooting.

If this is not immediately possible, temperature may be simulated in the Fluid
Properties sub-menu.
2. Temperature sensor has failed (often evidenced by a very HIGH temperature reading
on the display).
Solution:

Check the Low/High sub-menu to see if the meter’s temperature limits have been
exceeded.

The meter may need to be returned to the factory . If this is not immediately
possible, temperature may be simulated in the Fluid Properties sub-menu.
3. Remote wiring is incorrect.

Check that remote wiring is as shown in Figure 19 of this manual.