22
16 Troubleshooting
In the event you encounter a trouble that could be caused by a failure of the meter, refer to the
following table first. If the symptom is not listed in this table or the measures in this table does not
improve the situation, contact your nearest branch office or sales office.
Symptoms
Possible causes
Corrective actions
No pulse is output.
The external connection cable was
wrongly wired.
Check that the pulse outputs (unit
pulse/high-density pulse) are properly connected
in the correct polarity. Refer to Chapter 9,
External connection for how to connect the cable.
The external connection cable has
broken.
Repair the broken part, or replace the external
connection cable.
The connecter part of the external
connection cable has broken because its
sheathed part was rotated during the
connection/disconnection of the
connector.
Be sure to rotate the metal ring at the tip of the
connector.
Since the connector part has broken, the external
connection cable has to be replaced.
The display turns off.
The external connection cable was
wrongly wired (applicable only for the
external power source type).
Check that the power source is correct in voltage
and polarity. Refer to Chapter 9, External
connection for how to connect the cable.
The external connection cable has
broken (applicable only for the external
power source type).
Repair the broken part, or replace the external
connection cable.
The circuit board became moist due to
rainwater or other liquid, which led to a
short circuit.
This product is not a waterproof design. Be
careful not to let water get into the display.
Due to a lightning-induced impulse, an
overvoltage was applied to the internal
circuit board, which caused a breakdown
in the circuit board.
Since the internal circuit board has a failure, the
meter main body has to be replaced.
The most significant
digit of the integrated
flow rate display is
blinking.
The voltage of the battery has reduced
(applicable only for the Built-in battery
type).
The blink indicates that the battery is running
down.
The meter body has to be replaced.
The display cannot be
changed with a switch.
The switch has broken down because
firm pressure was placed on it with a
hard object such as a mechanical pencil
and screwdriver.
Since the switch has broken down, the meter
body has to be replaced. Operate switches with a
soft object, such as the tip of a finger.
The circuit board became moist due to
rainwater or other liquid, which led to a
short circuit and caused the
microcomputer to malfunction.
This product is not a waterproof design. Be
careful not to let water get into the display.
The integrated flow
rate value is increasing
in spite of the absence
of a gas flow.
Noises incoming from the external
connection cable caused the
microcomputer to malfunction.
Place the meter away from other signal wires.
Use a shielded wire as the extension wire to the
remote indicator. In addition, install a pulse
converter to isolate the transmitter circuit and the
receiver circuit.
- The integrated flow
rate value does not
increase.
- The flow rate of the
meter main body is
smaller than the
actual flow rate.
The meter is being used out of the
specified flow rate range, so that the
actual flow rate cannot be measured
correctly.
Use the meter main body in the specified flow
rate range.
The impeller cannot rotate correctly
because a foreign object has adhered to
the impeller.
Following Chapter 13, Instructions for inspection,
inspect the meter main body and remove the
foreign object. In addition, clean the inside of the
pipes and install a strainer upstream from the
meter main body.
The impeller cannot rotate correctly
because a foreign object in a pipe has
got into the bearing.
The impeller cannot rotate correctly
because drain or water has got into the
bearing.
The meter cannot be installed where drain or
water is supplied.
