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Troubleshooting
If the measurement is not accurate, its mostly because the condition of residual chlorine
electrode has changed. So it is necessary to check whether the residual chlorine
electrode is in good condition or not.
The residual chlorine electrode is not easy to damage, generally the membrane head
may has dirt ,the electrolyte maybe polluted or lost etc., user needs to replace the
membrane head or add / change electrolyte.
If the value of the instrument is too large, too small or no change, check whether the
electrolyte is dry, missing or contaminated. If the above conditions occur, change / add
the electrolyte.
MODBUS Troubleshooting
Problem
The baud rate, or stop bit does not match
No network offsets and terminations, or
Modbus no
network offsets and terminations are not
response
The slave address is incorrect, or the slave
address is the same as the address of
Modbus
abnormal
response
Possible reason
the Modbus master settings
Rs232 or RS485 cable is faulty
suitable.
another bus device
Register not supported
Incorrect data type
Verify that the settings match
the Modbus master device set-
tings, and verify that the Modbus
master device parity check is set
to None.
Replace / repair cables
Check the termination or
offset settings for all
network devices. Only the end-
points of the network should be
turned on and terminated, and
there should be only a point on
the network to provide an offset.
Verify that all addresses are
unique and are between 1 and
247.
Verify that the register is
supported.
Verify that the requested
register data type matches the
Modbus master device request.
For example, user cannot ac-
cess a floating point data using
2-byte integer data. When a
floating point data
(2 registers / 4 bytes) is request-
ed, two registers must be re-
quested at the same time.
12
Solution
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