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3.6 Troubleshooting
3.6.1 Operating messages in the display / error display
Display
Overrange
Underrange
Storagesystem
error
use Mode 34
Battery warning
Jus Overrange
E4
Jus Underrange
E4
Overrange
E1
Underrange
E1
E40 user
calibration
not possible
Zero not
accepted
Thermo Scientific Orion AQUAfast AQ3700 Colorimeter User Guide
Possible Causes
reading is exceeding the range
water sample is too cloudy
too much light on the photo cell
result is under the detection limit indicate result with lower x mg/l
mains power fails or is not
connected
full capacity
warning signal every 3 minutes
warning signal every 12 seconds
warning signal, the instrument
switches itself off
The user calibration is out of the
accepted range
The concentration of the standard
is too high/too low, so that during
user calibration the limit of the
range was exceeded
If the display shows Overrange/
Underrange for a test result a
user calibration is not possible
Light absorption
is too great or too low
Elimination
if possible dilute sample or use
other measuring range
filtrate water sample
seal on the cap?
Repeat measurement with seal
on the cap of the vial.
x = low end of measuring range;
if necessary use other analytical
method
insert or change battery.
Delete data with Mode 34
capacity of the battery is too low;
change the batteries
Please check the standard,
reaction time and other possible
faults.
Repeat the user calibration.
Perform the test with a standard
of higher/lower concentration
Perform the test with a standard
of higher/lower concentration
Refer to chapter 2.3.4
Performing Zero (page 196)
Clean sample chamber.
Repeat zeroing.
27
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