YSI Incorporated
Model 5000/5100 Service Manual
15
SECTION 6 DIAGNOSTICS
5000 and 5100s have a diagnostic mode that can be used for troubleshooting. In Diagnosis mode
you can view specific sensor information, such as DO probe current, DO background current and
pressure sensor offset. This data is useful when trying to isolate problems or prevent error
messages from occurring.
From the Main mode, press the [CALIBRATE] soft-key to enter Calibration mode, then press the
[Diagnosis] soft-key to enter Diagnosis mode. The following screen will be displayed.
Diagnosis
HISTORY
SENSOR
HELP
RESET Ps
6.1 HISTORY
Press the [HISTORY] soft-key to display the following information.
Date Time DO
uA
%/uA
C Diagnosis
02/01 14:12 16.8 5.98 21.9
02/02 08:42 16.3 7.90 28.0
02/05 09:55 17.0 6.42 23.0
02/06 10:58 17.1 7.47 27.9
02/07 13:08 16.9 6.43 22.8
HISTORY
SENSOR
HELP
RESET Ps
The History screen displays information about the last five DO calibrations. This information is
useful for tracking the performance of the DO probe/membrane. The following parameters are
displayed:
Date:
The date the calibration was performed.
Time:
The time the calibration was performed.
DO uA:
The dissolved oxygen calibration current in microamps. The calibration
current (100% saturation at sea level) of an ideal probe using a 1 mil
(standard) membrane is 13.7uA @ 20°C. If the probe current (100%
saturation @ 20°C, 1 mil membrane) is greater than 17.0uA or lower
than 8.0uA, the membrane/probe may need service. See
Troubleshooting, Error Codes, E3 and E4
.
%/uA:
The slope of the dissolved oxygen probe in percent per microamp
corrected to 20°C. The slope of an ideal probe using a 1 mil membrane is
7.3 %/uA @ 20°C. If the probe slope (1 mil membrane) is greater than
12.6 %/uA or lower than 5.9 %/uA, the membrane/probe may need
service. See
Troubleshooting, Error Codes, E3 and E4
.
C:
The temperature at the time of calibration in °C.
