Locating The Sampler; Piping Connections; Pumped Flow; Gravity Flow - Hach Sigma 1600 Instrument Manual

Section 2

2.1 Locating the Sampler

Note: The sampler must stand
upright at all times. Storage of the
unit on its side causes damage to
the refrigerator compressor.

2.2 Piping Connections

Note: To prevent damage to the
sampler, the inlet and outlet piping
should be adequately supported so
the weight of the piping and related
fittings do not impose a load on the
sample chamber fittings.

2.2.1 Pumped Flow

2.2.2 Gravity Flow

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Installation
Although the sampler may be located outdoors, an indoor location free of
humidity and temperature extremes can extend the useful life and operational
reliability of the unit. A suitable weatherproof enclosure is recommended if the
sampler is located outdoors. In cold weather, insulate the inlet and outlet
piping for freeze protection.
The sampler cabinet legs elevate the unit approximately ¾ in. off the floor,
which is generally sufficient to protect the refrigeration unit from water
damage. In areas subject to flooding or large amounts of water on the floor,
install the sampler on a 2–3 in. high concrete pad. Take the necessary steps
to ensure that the installation is level. Allow approximately 18 in. of clearance
from the back side of the sampler cabinet to the nearest obstruction to provide
easy access to the refrigeration system.
The flow through the sampling chamber of the sampler has a
2 in. inlet and 3 in. outlet. The pipe fittings on the chamber are Schedule 80
PVC socket couplings (PVC flanged connections are optional). If the sampler
is not equipped with the optional flanged fittings, install a true union in each of
the lines at the inlet and outlet of the sample chamber. This will provide a way
to disconnect the inlet and outlet at ease when cleaning and/or servicing
the sampler.
The length of a discharge pipe can vary greatly depending on the type of
installation. Install a throttling valve on the 2 in. inlet pipe near the sampler
with a bypass so that the flow rate can be adjusted to accommodate particular
site conditions. The bypass discharge pipe should not connect into the
discharge pipe of the sample flow through chamber. Gravity or a pump will
supply wastewater to the sample flow through chamber.
A piping schematic which includes the location of the sampler relative to the
sample source helps determine the static and total dynamic head of the
2 in. sample inlet piping. The actual pump configuration (i.e. centrifugal,
centrifugal self-priming, submersible, etc.) is a preference.
Maintain a minimum of 2 fps transport velocity of wastewater in the inlet piping
to minimize the chance of solids settling out in the wastewater. Use a smaller
size inlet piping if downstream flow conditions in the discharge pipe do not
permit a sufficient flow rate to maintain the velocity.
Install a 2 in. elbow at the sample chamber inlet if the inlet piping is less than
2 inches in diameter. A pump on/off switch must be located in the immediate
vicinity of the sampler.
If the flow rate is excessive, install a throttling valve and bypass piping
arrangement on the inlet pipe.
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Installation