Hach ORBISPHERE3650 Manuel D'utilisation De Base page 17

Calibration range checking
When calibrating the sensor in air or in a span gas, as detailed in Sensor calibration on page 15, the
new calibration current should be between 25% to 175% of the ideal current (which is stored in the
instrument's non-volatile memory for each membrane). If not, the instrument displays Err on its LCD
and the system will not calibrate. When the system will not calibrate, it is likely that a sensor service
will be required.
Note: This calibration range checking can be enabled or disabled using the WinLog97 program (see Sensor
calibration range checking on page 14). It is recommended to leave this checking feature enabled. In special
measurement situations it may be necessary to disable range checking. This will allow calibration between 0% to
999% of the ideal current. Contact a Hach Lange representative before disabling this range checking feature.
Maintenance
Instrument batteries
The instrument operates on battery power (two standard C-type cells). If battery power should drop,
a LO BAT warning message appears in the instrument LCD's top-left corner.
To install the batteries, unscrew the battery cap (on the right side of the instrument) with a coin or flat
screwdriver, place the cells lengthwise into the battery compartment (positive end first), and then
replace the cap. Refer to the diagram on the back of the instrument.
Rechargeable nickel-cadmium batteries may be used - expect about 40 hours of autonomy. Alkaline
batteries provide the longest continuous use though mercury-free batteries are available that present
less of a disposal problem.
Make sure that a fully charged (or fresh) set is installed before switching on the instrument.
Sensor
For information on sensor maintenance and servicing, please refer to the accompanying Sensor
Manual.
Troubleshooting
If your analyzer is behaving strangely (failing to calibrate, giving inappropriate measurement values,
etc.) and you have attempted to rectify the problem by servicing the sensor, but to no avail, you may
wish to use the Troubleshooting menu of the PC WinLog97 program to make sure that the
instrument is configured correctly for your application, and is in good working order.
The instrument must be connected to your PC and placed in measurement mode to perform these
tests.
Serial test
Normally, the analyzer will inform you of a disconnected RS-232 (serial) link when appropriate.
However, you can confirm a good connection using the Troubleshooting, Serial Link Test by
echoing a test message via the instrument.
Enter text characters in the Text to be sent box, then click Send. If the serial link is operating
correctly, the exact same text will be displayed back from the instrument in the Echo box. Choose
Cancel to exit from this test box.
Keyboard test
The Troubleshooting, Keyboard Test will reveal whether all the analyzer buttons are functioning
correctly.
Press any one of the instrument's buttons (except the ON/OFF button) for a full second or more. The
appropriate square on-screen should darken. Choose Cancel to exit from this test box.
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