Hach-Lange Sigma SD900 Portable - Manual (Page 32)

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Installation
Optional battery cable
If the external battery cable with bare leads (Cat. No. 2198) is used,
the following requirements must be met:
• The cable must not be altered to more than 3 meters long.
• The cable can only be connected to a 12 VDC battery.
• The maximum voltage cannot exceed 18 VDC.
• Failure to observe proper polarity when connecting the
clips to the battery will result in a blown fuse in the cable.
3.5.1.2 AC power installation
WARNING
Electric shock hazard. The temperature of the power supply
will increase when the sampler pump is operating. If the time
interval between sample cycles is too short, the power supply
can become overheated and result in a electric shock hazard
or power supply failure. Refer to the power supply instruction
sheet (DOC306.53.00801) to determine the time that the pump
must stay off between sample cycles to prevent overheating.
Prerequisites:
Important Note: Use only the AC power supply that is specified for
this sampler. The power supply connector must have three pins. An
adapter cannot be used to convert a older two-pin power supply for
use with this sampler.
• AC power supply (Cat. No. 8754500US)
Installation procedure:
1. Place the power supply directly behind the controller ( Figure 3
on page 13 ).
2. Pull the rubber straps up and over the clips at each end of the
power supply to secure it to the sampler body.
3. Connect the cable from the power supply to the power
connector on the controller.
Electrical transients
When connected to an AC power source, the SD900 controller may
be temporarily upset by strong electrical transients caused by
sources such as lightning or large electrical motors. These upsets
can result in a missed sample, but the SD900 controller will recover
and continue with the sample program.
A missed sample will be recorded and can be viewed in the status,
event log or sample history screens. Remedial actions may involve
the use of a power line filter or connecting the controller to a
different branch circuit.