Hach-Lange SIGMA SD900 Refrigerated Sampler and All Weather Refrigerated Sampler User Manual - Manual (Page 21)

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General Information
The compartment heater is a factory installed option and needs to
be specified at the time of order.
2.2.1.3 Refrigeration compartment door (AWRS only)
The lockable front door opens by pressing the round button in the
center of the latch. When closing the door, flip the latch closed to
pull the door tight. Two keys are provided for the door lock. Over
time, the door latch may require adjustment (refer to
section 6.8 on
page 84 ).
2.2.1.4 Optional AC battery backup
The AC Battery Back Up is an enclosed 12VDC battery designed to
temporarily power a sampler when the normal AC power source
has failed. The backup battery charge is restored and maintained
by normal operation of the sampler AC power supply.
In the event of a power fail, the optional battery back up will provide
power to the controller and allow the sampling program to continue
running. The battery backup does not provide power to the
refrigerated cabinet.
The operating temperature for the AC battery backup is -15 ºC to
40 ºC (5 ºF to 104 ºF).
The battery backup can be factory or customer installed and is
available in two models:
• Item number 8757400 comes with a 16 in. output cable for
SD900 Refrigerated and SD900 Portable samplers.
• Item number 5698200 comes with a 29 in. output cable for
SD900 All Weather Refrigerated and SD900 Portable
samplers.
Important Note: The AC Power Battery Back Up should only be
installed on samplers equipped with power supplies identified by
item number 8754500 and ending in the letters US, EU, IL, or UK.