Ise-System Messages - wtw pH 340/ION Instruction Manuals

ISE - System messages
System message
Std 2
Std 3
TP
during calibration
TP
during
measurement
Concentration
value flashes
during calibration
Concentration
value flashes
during
measurement
Troubleshooting
Cause
Standard 2 = Standard 1
Requirement 3>2, if 2>1
not fulfilled
Requirement 3<2, if 2<1
not fulfilled
- > 2K
ϑ ϑ
2 1
- > 2K
ϑ ϑ or
3 2
+
ϑ ϑ ϑ
1 2
- > 2K
2
+ +
ϑ ϑ ϑ
1 2 ϑ
3
- > 2K
2
U -U < 5mV
2 1
U -U < 5mV
3 2
Test value outside the range
marked by calibration
Slope not in the range of
S = 50 ... 70 mV
or
S = 25 ... 35 mV
or
sequence of the standards for
3-point cal wrong
or
- > 2K
ϑ ϑ
3 1
(after 2-point cal)
(after 2-point cal)
S+
Action
Use different standards
Use other standard 3
Temper the standards
Temper the test solutions
Standards are too close
together. Select other
standard
Select calibration standard
so that test value is between
Exchange electrode
•
• Recalibrate
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