6. If the problem is not resolved, contact customer support.
17.16 Check the cutoffs
If the transmitter cutoffs are configured incorrectly, the transmitter may report zero flow when flow is
present, or very small amounts of flow under no-flow conditions.
There are separate cutoff parameters for mass flow rate, volume flow rate, gas standard volume flow rate (if
applicable), and density. There is an independent cutoff for the mA Output on your transmitter. The
interaction between cutoffs sometimes produces unexpected results.
Procedure
Verify the configuration of all cutoffs.
17.17 Check the direction parameters
If the direction parameters are set incorrectly, flow rate may be reported as reverse when it is actually
forward, or vice versa. Totalizers and inventories may increment when they should decrement, or vice versa.
The reported flow rate and flow totals depend on the interaction of four factors: the flow direction arrow on
the sensor, actual flow direction, the
Sensor Flow Direction Arrow
parameter, the
Direction
parameter for
the mA output or the frequency output, and the
Totalizer Direction
parameter.
Procedure
1. Ensure that
Sensor Flow Direction Arrow
is set correctly for your sensor installation and your process.
2. Verify the configuration of
mA Output Direction
,
Frequency Output Direction
, and
Totalizer
Direction
.
17.18 Check the drive gain
Excessive or erratic drive gain may indicate any of a variety of process conditions or sensor problems.
To know whether your drive gain is excessive or erratic, you must collect drive gain data during the problem
condition and compare it to drive gain data from a period of normal operation.
Excessive (saturated) drive gain
Table 17-2: Possible causes and recommended actions for excessive (saturated) drive gain
Possible cause
Recommended actions
Bent sensor tube
Check the pickoff voltages (see
). If either of them are close to
zero (but neither is zero), the sensor tubes may be bent. The sensor will need to be
replaced.
Cracked sensor tube
Replace the sensor.
Core processor or module
failure
Contact customer support.
Flow rate out of range
Ensure that the flow rate is within sensor limits.
Open drive or pickoff
sensor coil
Contact customer support.
Troubleshooting
Configuration and Use Manual
March 2019
MMI-20025166
286
Micro Motion Model 5700 Transmitters with Configurable Outputs