Hach-Lange SIGMA SD900 Refrigerated Sampler and All Weather Refrigerated Sampler User Manual - Manual (Page 18)

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General Information
2.2 Sampler overview
DANGER
Explosion hazard. The refrigerated sampler and all weather
refrigerated sampler are not certified for, nor suitable for use
in hazardous classified locations.
DANGER
Potential Explosion, Fire, and Chemical Hazards. This sampler
is designed for collection of aqueous samples only. Collection
of non-aqueous samples may damage the equipment and
could result in explosion, fire, and chemical hazards.
The SD900 sampler automatically collects and preserves liquid
samples. The sampler is suitable for collection of conventional and
toxic pollutants and suspended solids.
2.2.1 Sampler components
Refrigerated sampler
The refrigerated sampler is designed for indoor use (
Figure 6 on
page 21 ). The sampler controller is mounted on top of a specially
designed refrigerator. The sample line passes through the top of
the refrigerator and into the refrigerated compartment where the
sample container(s) are located. The compartment is surrounded
by rigid foam insulation and utilizes a 120 CFM condenser fan.
Sample temperature is controlled by an air sensing thermostat
maintaining samples at 4 °C (39 °F) in ambients up to 49 °C
(120 °F). The temperature inside the refrigerator is controlled by the
thermostat control knob, which is recessed in the front grill on the
bottom of the refrigerator. The unit has a magnetic door seal and
does not require rear ventilation. The refrigerator interior is food
grade plastic and the exterior is vinyl coated galvanized steel (201
stainless steel is optional). As a further barrier against corrosion,
the refrigeration components and copper plumbing are treated with
a phenolic resin coating.
The controller is powered by a separate power supply located on
top of the refrigerator and constrained by the transition plate and
power supply retainer.
All weather refrigerated sampler
(
Figure 6 on page 21 ) The all weather refrigerated sampler is
designed for indoor and outdoor applications. The controller
withstands submersion, corrosion and ice and conforms to NEMA
4X, 6, IP 67 ratings. The cabinet is molded in low density
polyethylene, and is UV stable and weather resistant. The
refrigeration components are polymer coated, providing superior
corrosive resistance. With the compressor and condenser located
above the refrigerated compartment, heat transfer is directed away
from the compartment. A microprocessor controlled thermal system
maintains samples at EPA mandated 4 °C (39 °F). Top mounted
refrigeration components also minimize exposure to the corrosive
plant environments.