YSI Incorporated
Model 5000/5100 Service Manual
16
6.2 SENSOR
Press the [SENSOR] soft-key to display the following sensor diagnostics screen:
System Parameters
Sensor
Cal. Temperature
=
22.85 C
Probe Slope
=
6.43 %/uA @20C
Probe Offset
=
0.075 uA
Probe Current =
16.91 uA
Pressure Offset
=
830 mbar
Cal. Temperature:
The temperature at the time of the last calibration in °C.
Probe Slope:
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
.
Probe Offset:
The zero offset current (background current) of the DO probe in
microamps. The factory default value is 0.075 uA. This value
will only change when a zero calibration is performed (see
Calibration, Zero Calibration
). If this value is greater than
0.15uA (after a zero calibration) the membrane/probe may need
service. See
Troubleshooting, Error Code E2
.
Probe Current:
The present (real time) DO probe current in microamps.
Pressure Offset:
The offset of the barometer in millibars.
Press [MODE] to return to the Diagnosis menu. Press [MODE] two more times to return to the
Main menu.
6.3 RESET
PS
The [RESET Ps] soft-key (Reset Parameters) is used to reset all instrument parameters to the
factory default values. This is useful when the parameters have been changed or corrupted, such
as when new software is loaded. Press the [RESET Ps] soft-key to display the following:
Reset
Press ENTER to RESET Parameters
HISTORY
SENSOR
HELP
RESET Ps
Press [ENTER] to confirm. If you do NOT wish to reset the parameters, press [MODE] to return
to the Diagnosis menu.
