Azbil JTD720A, User Manual, Page: 64 / 76

Instrument maintenance and troubleshooting Azbil Corporation
4-14 Model JTD720A - Smart Multivariable Transmitter
4-4 : Troubleshooting
4-4-1 : Checking this instrument
If the transmitter does not operate, or if it operates erroneously, check the items in
Tables 4-4 and 4-5. If the situation does not improve even after performing these
checks, stop using the device immediately, turn off the power, and contact one of our
branch offices, sales offices, or distributors.
Table 4-2 Troubleshooting
Phenomenon Countermeasures
Nothing is displayed on
the display
• Confirm that the correct power supply voltage is being
applied.
• Confirm that the power supply is connected.
Output is fixed at 0
• Confirm that the device's settings are correct.
• Confirm that the flow rate is not in the low-flow cutoff
range.
• Confirm that there are no clogs in the connecting
pipes.
• Confirm that the manifold valve, stop valves, etc., are
in the correct open and closed states.
Output is shifted
• Confirm that fluid is not leaking from the pipes.
• Confirm that fluid is not flowing in reverse.
• Confirm that the respective directions of the high
pressure side and low pressure side connections are
correct.
• Confirm that the transmitter is not tilted significantly.
In addition to the above, check the following.
• S elf-diagnostics results using the communicator (Table 4-5)
• Whether there are leaks in the pipe connectors
• Whether the product side bolt fasteners are loose
• Whether any pipes are loose or disconnected
• Whether the power supply voltage, load resistance, etc., are in accordance with the
specifications
• Whether the pressure and temperature are in accordance with the specifications
• Whether there are any strong sources of magnetism or electrical noise nearby