Field Troubleshooting - Greyline TTFM 6.1 User Manual

FIELD TROUBLESHOOTING

Possible Causes:
METER READING WHEN THERE IS NO FLOW?
Erratic measurement (set damping to
0% to check) due to electrical noise
or poor signal quality.
Variable Speed Drive interference
METER READING LOWER THAN EXPECTED?
Calibration Error
Lower flow rate than expected
Erratic measurement (set damping to
0% to check) due to electrical noise
or poor signal quality.
NO ECHO INDICATION Icon: No Echo
Improper Installation
Sensors not mounted to Pipe or
mounted improperly
Corrective Action:

Calibration
Set
Setup Tare
/

Ensure all Flowmeter wiring is in METAL conduit and sensor
shield is properly connected to Ground.

Ensure correct power input Ground connection (<1 ohm
resistance).

Ensure 4-20mA Shield connected to Instrument Ground stud.

Calibration
Adjust

Contact Greyline for further assistance.

Follow Drive manufacturers wiring and Grounding instructions

Relocate Flowmeter electronics, Sensor and wiring away from
VSD

Review calibration menu. Pipe dimensions and fluid
selection/fluid velocity.

Investigate pump/valves. Compare velocity with alternate
instrument.

Ensure all Flowmeter wiring is in METAL conduit and sensor
shield is properly grounded.

Ensure correct power input Ground connection (<1 ohm
resistance).

Ensure 4-20mA Shield connected to Instrument Ground stud.

Contact Greyline for further assistance.

Check Setup menu to ensure pipe material, size, thickness, liner
type, thickness, fluid type, and fluid temperature and configured
properly. Check transducer mounting method and spacing
matches Setup menu values.

Apply coupling compound and mount sensors to pipe with proper
sensor spacing.
Page 55
TTFM 6.1 Transit Time Flow Meter
Damping 0%
/ to
function.
Min Flow
/ setting.
with zero flow use