Check The Direction Parameters; Check The Drive Gain; Check The Cutoffs - Emerson Micro Motion 5700 Configuration And Use Manual

Troubleshooting
March 2019
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
Bent sensor tube
Cracked sensor tube
Core processor or module
failure
Flow rate out of range
Open drive or pickoff
sensor coil
286
Recommended actions
Check the pickoff voltages (see
zero (but neither is zero), the sensor tubes may be bent. The sensor will need to be
replaced.
Replace the sensor.
Contact customer support.
Ensure that the flow rate is within sensor limits.
Contact customer support.
Check the pickoff voltage). If either of them are close to
Micro Motion Model 5700 Transmitters with Configurable Outputs
Configuration and Use Manual
MMI-20025166