horiba TW-150 Instruction Manual page 184

8 TROUBLESHOOTING
Alarm Alarm
Item
No. description
Concentration
50
upper limit
pH
Concentration
51
lower limit
Concentration
52 device upper
limit
Concentration
53 device lower
limit
55 Zero calibration
pH
56 Span calibration
158
Cause
Sample water abnormality
Dirt in pH sensor
Connection failure in pH
sensor connector
pH sensor expiration or
failure
Internal analog circuit board
failure
Sample water abnormality
Dirt in pH sensor
Connection failure in pH
sensor connector
pH sensor expiration or
failure
Internal analog circuit board
failure
Connection failure in pH
sensor connector
pH sensor expiration or
failure
Internal analog circuit board
failure
Connection failure in pH
sensor connector
pH sensor expiration or
failure
Internal analog circuit board
failure
Mismatched calibration
results
Mismatching calibration
solution
Connection failure in pH
sensor connector
pH sensor expiration or
failure
Internal analog circuit board
failure
Mismatched calibration
results
Mismatching calibration
solution
Connection failure in pH
sensor connector
pH sensor expiration or
failure
Internal analog circuit board
failure
Corrective action
(*: Manufacturer service required)
Manually analyze sample water.
Clean pH sensor.
Inspect pH sensor connection.*
Replace pH sensor.
Replace internal analog circuit
board (TW-ADC-01).*
Manually analyze sample water.
Clean pH sensor.
Inspect pH sensor connection.*
Replace pH sensor.
Replace internal analog circuit
board (TW-ADC-01).*
Inspect pH sensor connection.*
Replace pH sensor.
Replace internal analog circuit
board (TW-ADC-01).*
Inspect pH sensor connection.*
Replace pH sensor.
Replace internal analog circuit
board (TW-ADC-01).*
Reset calibration value and
reexecute calibration.
Check calibration solution and
reexecute calibration.
Inspect pH sensor connection.*
Replace pH sensor.
Replace internal analog circuit
board (TW-ADC-01).*
Reset calibration value and
reexecute calibration.
Check calibration solution and
reexecute calibration.
Inspect pH sensor connection.*
Replace pH sensor.
Replace internal analog circuit
board (TW-ADC-01).*
Reference
page 138
page 145
page 138
page 145
page 138
page 145
page 138
page 145
page 24
page 138
page 145
page 24
page 138
page 145