Instruction manual

44 Micro Motion
®
Model D and DT Sensors Instruction Manual
Troubleshooting continued
Inaccurate flow rate or batch total
Symptom
The flowmeter indicates a flow rate or batch total that does not agree
with a reference rate or total.
Troubleshooting instructions
To troubleshoot an inaccurate flow rate or batch total, you will need one
of the communications devices listed on page 46 or a transmitter with a
display. Refer to the table below for the necessary steps to troubleshoot
an inaccurate rate or total.
Table 3. Troubleshooting inaccurate flow rate or batch total
Procedure Instructions What to do next
1. Check for the proper flow
calibration factor
See page 49 • If the flow cal factor is correct, go to step 2
• If the flow cal factor is incorrect, change it, then go to step 15
2. Check the flow units See page 46 • If the flow units are OK, go to step 3
• If the flow units are wrong, change them, then go to step 15
3. Make sure the flowmeter was
zeroed properly
See page 39 • If the flowmeter was zeroed properly, go to step 4
• If the flowmeter was not zeroed properly, zero it, then go
to step 15
4. Is the flow measurement
configured for mass or volume?
See page 46 • If the configuration is for mass, go to step 6
• If the configuration is for volume, go to step 5
5. Check for the proper density
calibration factor
See page 49 • If the dens cal factor is correct, go to step 6
• If the dens cal factor is incorrect, change it, then go to
step 15
6. Make sure the density reading is
accurate for the fluid
See page 50 • If the density reading is correct, go to step 7
• If the density reading is wrong, go to step 11
7. Make sure the temperature
reading is accurate for the fluid
See page 50 • If the temperature reading is correct, go to step 8
• If the temperature reading is wrong, go to step 14
8. Is the flow measurement
configured for mass or volume?
See page 46 • If the configuration is for mass, go to step 11
• If the configuration is for volume, go to step 9
9. Is the reference total based on a
fixed density value?
• If the total is based on a fixed value, go to step 10
• If the total is not based on a fixed value, go to step 11
10. Change flow units to mass flow
units
See page 46 • Go to step 15
11. Check for faulty or improperly
installed grounding
See page 51 • If the grounding is OK, go to step 12
• If the grounding is incorrect or faulty, fix it, then go to step 15
12. Check for two-phase flow See page 53 • If there is no two-phase flow, go to step 13
• If there is two-phase flow, fix the problem, then go to step 15
13. Check the scale (or reference
measurement) for accuracy
Use your plant
procedures
• If the scale is accurate, go to step 14
• If the scale is not accurate, fix it, then go to step 15
14. Check for faulty or improperly
installed flowmeter wiring
See page 47 • If the flowmeter wiring is OK, go to step 16
• If the flowmeter wiring is incorrect or faulty, fix or replace it,
then go to step 15
15. Run a new batch and check again
for an inaccurate rate or total
• If the rate or total is correct, you’ve solved the problem
• If the rate or total is wrong, start over at step 2 or go to
step 16
16. Contact Micro Motion Phone numbers are
listed on page 41