8 TROUBLESHOOTING
149
50
pH
Concentration
upper limit
Sample water abnormality
Manually analyze sample water.
Dirt in pH sensor
Clean pH sensor.
Connection failure in pH
sensor connector
Inspect pH sensor connection.*
pH sensor expiration or
failure
Replace pH sensor.
Internal analog circuit board
failure
Replace internal analog circuit
board (TW-ADC-01).*
51
Concentration
lower limit
Sample water abnormality
Manually analyze sample water.
Dirt in pH sensor
Clean pH sensor.
Connection failure in pH
sensor connector
Inspect pH sensor connection.*
pH sensor expiration or
failure
Replace pH sensor.
Internal analog circuit board
failure
Replace internal analog circuit
board (TW-ADC-01).*
52
Concentration
device upper
limit
Connection failure in pH
sensor connector
Inspect pH sensor connection.*
pH sensor expiration or
failure
Replace pH sensor.
Internal analog circuit board
failure
Replace internal analog circuit
board (TW-ADC-01).*
53
pH
Concentration
device lower
limit
Connection failure in pH
sensor connector
Inspect pH sensor connection.*
pH sensor expiration or
failure
Replace pH sensor.
Internal analog circuit board
failure
Replace internal analog circuit
board (TW-ADC-01).*
55
Zero calibration
Mismatched calibration
results
Reset calibration value and
reexecute calibration.
Mismatching calibration
solution
Check calibration solution and
reexecute calibration.
Connection failure in pH
sensor connector
Inspect pH sensor connection.*
pH sensor expiration or
failure
Replace pH sensor.
Internal analog circuit board
failure
Replace internal analog circuit
board (TW-ADC-01).*
56
Span calibration
Mismatched calibration
results
Reset calibration value and
reexecute calibration.
Mismatching calibration
solution
Check calibration solution and
reexecute calibration.
Connection failure in pH
sensor connector
Inspect pH sensor connection.*
pH sensor expiration or
failure
Replace pH sensor.
Internal analog circuit board
failure
Replace internal analog circuit
board (TW-ADC-01).*
Alarm
No.
Item
Alarm
description
Cause
Corrective action
(*: Manufacturer service required)
Reference
Summary of Contents for TW-100
Page 1: ...Water Distribution Monitor TW 100 Instruction Manual CODE GZ0000080187H ...
Page 8: ......
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