Emerson Micro Motion 5700 - Check the Cutoffs; Check the Direction Parameters; Check the Drive Gain

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 Check the pickoff voltage). 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