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Isco 4700
Refrigerated Sampler
Section 1 Introduction
1.1 Sampler Overview
In this section...
• Sampler Overview
• Features, page 1-2
• Specifications, page 1-4
The 4700 Refrigerated Sampler is an automated wastewater
sampler that can collect liquid samples from a variety of sources
including open channels, sewers, and storm pipe conduits.
This indoor/outdoor use sampler is made of durable UV-resistant
plastic that provides exceptional resistance to corrosion and
weathering. Most notably, the refrigerator body is made from
rotationally molded linear low-density polyethylene. This unique
construction material was selected for its strength, durability,
and its ability to withstand temperature extremes. The system is
rated for –29 to 49 °C (–20 to 120 °F) operation. The hollow cav-
ities are filled with foam insulation. To protect the non-CFC
system, all refrigeration p arts are powder coa ted with
heat-treated polyester.
Unattended sample collection events can be triggered by time
intervals (time pacing), or by flow volume measured by an
external flow measurement device (flow pacing or constant
volume variable time). Isco flow meters are compatible flow mea-
surement devices, as well as any device that can provide a 5 to
15 VDC pulse or contact closure of at least 25 mS, or a linear
4-20 mA current loop signal. An external device can also disable
the sampler until measured site conditions are met, at which
time the sampler begins the automated collection.
The sampler's pump can deliver the liquid through a 9 mm (
suction line at transport velocities of at least 0.9 meters per
second (3.0 ft/sec) at 0.9 m (3.0 ft) of head. The transport velocity
at 7.6 m (25 ft) of head is 0.67 m/sec (2.2 ft/sec). The maximum
lifting height of the sampler is 8 m (28 ft). To produce accurate
and repeatable samples, the pump uses a pump revolution
1
counter and patented
The collected samples are stored inside the refrigerated com-
partment and cooled for sample preservation. Samples can be
deposited into a single bottle (composite), or collected as discrete
samples, each into a separate bottle of a multi-bottle rack
(sequential), or a combination of these modes. The cooled samples
are maintained until an operator can remove them from the
sampler and deliver them to the laboratory.
1. United States patent 5,125,801
non-contacting liquid detector.
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