| Troubles | Reasons | Removing |
| Value of dp is not steady | Installation was incorrectness | Install again follow 5.1 |
| DP is sometimes big or small |
Setting Zero was of no effect | Check-up connection between the transmitter and the sensor |
| Display “Vibration Stops” | Bad connection, or dirty inner tube |
Check-up connection or clean inner tube |
| Display “Density Too Low” or density is sometimes big or small |
There is gas in the tube | Discharge gas or equip a gas-liquid separator |
| Density has error | After installation | Adjust density coeff. b |
| Not working (display not changed after power on) |
Power off too short, or power-cord bad contact | Power off for 10 seconds, keeping fine contact |
| Display minus flow | Setting zero at flow, or valve close not tight after select dp-0 | Do not select dp-0, setting zero follow this manual |
| No communication signal on upper computer |
Check-up connecting lines was not broken |
Exchange A, B connection |
| Communication of upper compute sometimes mistake | Program of communication is good |
Change a good RS232/485 converter |
Testing parameters for normal sensor:
Driving coil (1-2 pins): resistance: <50Ω; ac voltage: 1V±0.5V.
Testing coils (3-4 or 5-4 pins): resistance: <100Ω; ac voltage: 0.5V±0.3V.
Temperature resistance: (7-8 pins): 100Ω±10Ω (when 0℃), coefficient ≈ 0.38Ω / ℃.
Temperature resistance: (6-7 or 8-9 pins): 0Ω±2Ω
Attentions and maintenance
The lifetime of the meter is relative to care and maintenance.
To extend the lifetime of the mass flow meter, should care and maintain best as follows:
（1） Keep clean for sensors and transmitters; do not put transmitters in dusty place.
（2） Move sensors and transmitters gently, do not throw or break.
（3） Should rinse inner tubes of the sensor periodically, shorten the clean period for glutinous fluid.
（4） Examine and repair regularly. Periodically calibrate by the metrology department for nicety measurement customers.