Thermo Scientific Sarasota FD900, Руководство пользователя

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6-2
User Guide for Sarasota ID900, FD900, & PD900 Gas Density Meters Thermo Fisher Scientific
Troubleshooting &Service
General Troubleshooting
7.
Examine the spool and body immediately after removal and checkfor
condensation, as well as dirt.
Symptom:
Meter readings at zero.
1. If density reading is zero, check the period reading. If it is correct, the
fault is associated with the Sarasota HME900 or flow computer. If the
period reading is zero, check whether there is a period signal from the
density meter at the terminal box and barriers, if used. If not, check the
supply to it as described in step 5 for “Unstablereadings”.
2. If there is no supply, check through the barriers and terminal box
connections to the Sarasota HME900 or flow computer. If no supply is
present, replace the Sarasota HME900 or computer.
3. If the supply is correct but there is no signal output from the density
meter, ensure that the instrument is clean and the spool is undamaged
(refer to “Cleaning” in Chapter 5). If the density meter appears clean,
contact Thermo Fisher.
Symptom:
Meter readings permanently at full scale.
1. Check the period reading. If correct, then check the Sarasota HME900
for incorrect parameters.
2. If the period is incorrect, check the supply to the density meter
described in step 5 for “Unstable readings”. Check the spool for dirt.If
the supply is incorrect, check through the connections and barriers to
the Sarasota HME900 or flow computer. If faulty, replace or return to
manufacturer for servicing.
Symptom:
Meter readings vary with flow rate.
1. If readings are erratic, clean the densitymeter.
2. If readings are stable, check theinstallation.
3. Check for air bubbles.
4. Check for dirt in the fluid.