Hach-Lange SIGMA SD900 Refrigerated Sampler and All Weather Refrigerated Sampler User Manual - Manual (Page 62)

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Sampler operation
3. Select YES to set a new password or NO to activate the existing
password.
4. If yes was selected, enter the old password and press ENTER . If
changing the password for the first time, enter 900900 as the
old password.
5. Enter a new password and press ENTER . The new password
will be required to access the menus for program setup and
system setup.
4.9.4 SDI-12 configuration
Important Note: When connecting a Hydrolab DS5 or MS5 to a
mains powered SD900, measurement errors may occur in the
MS/DS 5 due to electrical transients caused by sources such as
lightning or large electrical motors. This can result in unexpected
sample acquisition or a missed sample when the controller is
programmed for setpoint sampling based on sonde measurements.
Use a power line filter or connect the controller to a different branch
circuit to reduce the chance of transients.
The optional SDI-12 interface can connect to devices such as the
Hydrolab MS5 and DS5 to collect water quality measurement data
for use as triggers in setpoint sampling applications. Use cable
8762400 (50 ft.) or cable 8762500 (100 ft.) to connect a sonde to
the SD900. Refer to
Figure 28 .
The SD900 can retrieve up to 9 measurements from one SDI-12
sensor. The address assigned to the SDI-12 device is automatically
determined by the SD900. The SD900 provides power to the
SDI-12 device. A separate sonde power source is necessary only
when data logging by the sonde is required.
Figure 28 Sonde connection
1 Sonde 4 SDI-12 connector
2 Sonde bulkhead connector 5 50 or 100 ft. cable
3 6-pin cable connector