Roche 91 Series - Page 172

Roche Diagnostics April 2007
D-10 Service manual · Version 2.0
13 Troubleshooting 91xx pH/Electrolyte Analyzers
Error messages and troubleshooting
o CA NOT CAL’D
o LI NOT CAL’D
These messages will be displayed when a specific electrode does not calibrate properly
during a calibration sequence. If more than six standard draws are required or the
difference between Standard A and Standard B voltages is out of range, the [NOT
CALIBRATED] message will be displayed for each channel which exhibits either of
these conditions. A copy of the calibration report should be printed to provide the
electrode output voltages measured during calibration.
The electrode voltage range table identifies correct voltage ranges for each electrode
parameter.
If the difference between Standard A and Standard C (9180/9181 only) is out of range
for Li
+
or Na
+
, [LI NOT CAL’D] will be displayed.
Possible causes and remedies
o Check to ensure calibration reagents are transported correctly. Test for leaks,
blockages, bubbles, or improper pump flow rate.
o Check or replace ISE SnapPak™.
o Check whether electrodes are plugged in properly. Check the slide mechanism to
ensure it is in the correct position and firmly pushed into electrode connectors.
Clean and/or replace electrode.
o If A-C is out of range for Na
+
, repeat the calibration or replace the ISE SnapPak™.
o Check or replace SBC Card.
ELECTRODE VOLTAGE RANGES 9110
Electrode Standard A Standard B Allowable Difference A-B
pH -2100 to -100 -1600 to +900 -430 to -650
Ta bl e D -1 9110 electrode voltage ranges
ELECTRODE VOLTAGE RANGES 9120, 9130, 9140
Electrode Standard A Standard B Allowable Difference A-B
9120/9130 9140
Na
+
-600 to +2400 -1600 to +2200 +720 to +2000 +250 to +680
K
+
-700 to +1000 -2500 to +500 +520 to +1800 +470 to +120
Cl
–
-3100 to -100 -1100 to +1800 -520 to -1200 not used
Ca
2+
-2600 to +1400 -2100 to +2700 not used -480 to -900
Ta bl e D -2 9120, 9130, 9140 electrode voltage ranges
ELECTRODE VOLTAGE RANGES 9180, 9181
Electrode Standard A Standard B Standard C Allowable Difference
A-B A-C
Na
+
-600 to +2400 -1600 to +2000 -600 to +2400 +250 to +680 -50 to +50
K
+
-700 to +1000 -2500 to +500 -700 to +1000 +470 to +1200 -40 to +40
Cl
–
-3100 to -100 -1000 to +3000 -3100 to -100 -370 to -860 not used
Ca
2+
-3100 to +1000 -2300 to +2500 -3100 to +1000 -350 to -660 -150 to +150
Li
+
-3100 to +1900 -3600 to +1400 -2600 to +3400 +1 to +760 -1730 to -285
Ta b le D - 3 9180, 9181 electrode voltage ranges