Hach FL900 Series, Basic User Manual

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Replace the batteries
Replace the batteries with the same type and rating. Refer to Install the batteries on page 9 and
Specifications on page 3.
Replace the desiccant
The desiccant is located in the battery compartment. To remove the battery cover, refer to Install the
batteries on page 9. The desiccant absorbs moisture from the air and prevents corrosion to the
instrument components. The desiccant beads change color when they become saturated. Replace
the desiccant when the beads change from a yellow to a green color (refer to
Figure 14 ). As a best
practice, replace the desiccant when the batteries are replaced.
Figure 14 Desiccant replacement
Troubleshooting
If problems occur in the system, try to find whether the problem is with the sensor, the logger or the
cable connections.
• Examine all connections to the sensors. Make sure all connections are tight.
• Remove and examine the sensor connectors for moisture. Clean and dry if necessary.
• Examine the sensors for debris and remove the debris.
• Examine the Event Log for problem events.
Communication failure
If a call was sent to the server but the connection failed, complete the following tasks:
• Disconnect and apply power to the instrument.
• Adjust the antenna to increase the signal strength.
• Log on to the server and make sure that the serial number was entered correctly and that the SVC
used for configuration was recorded correctly.
• Make sure that the communication settings were entered correctly in the FL900 driver window.
• Connect the logger to the computer and open a communications session. In the FL900 driver
window, click on the Diagnostics tab and then the Modem menu. The Registration Status should
be Home.
• If there is no resolution, call technical support.
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