Hach 1950Plus, Инструкция по эксплуатации инструмента, Страница: 17 / 188

Section 1
Page 17
UVTOCIntroduction.fm
Major Components
1.3.1 Liquids Enclosure
This enclosure houses the inlet, sparger, and reactor manifold. In addition, it
contains the gas-liquid separator (GLS), the pumps, the UV assembly, and the
liquid drains.
• Fluid flow is simplified by using three manifold assemblies:
• The inlet manifold contains all the connections for reagents, stream,
and calibrations standards, and associated valves
(
Figure 2 on page 18 ).
• The sparger manifold is integrated with the flow control and pressure
gauge. It provides the mixing of the acid and sample as well as the
liquid flow detection. See
Figure 3 on page 19 .
• The reactor manifold provides the mixing of sample and persulfate
(
Figure 2 on page 18 ).
• Two pump motors are used for the entire analyzer range. Different pump
heads are used to obtain different ranges (
Figure 2 on page 18 ).
Some optically inhomogeneous
sample compositions will provide
false triggering, requiring that the
flow failure be disabled in the
Service\Input Status screen.
• The UV reactor assembly is capable of mounting up to four standard UV
lamps and their encapsulated electronic switching power supplies
(
Figure 2 on page 18 ).
• Flow detection is available as sample and reactor flow using bubble
detection, which is fed into the electronic assembly for appropriate action.
1.3.2 Electronics Enclosure
This enclosure contains the IR bench, the 8000 Display/Controller PCB
assembly, the 8001 I/O Termination PCB assembly, and the configurable
115/230 V 50/60 Hz analyzer power supply. The front panel of this enclosure
contains the window for the 2 line x 16 character alphanumeric display, three
analyzer status LEDs, and the four-button tactile membrane keypad (
Figure 3
on page 19 and Figure 4 on page 20 ).
Additional information on the front panel is contained in section 1.3.3 on
page 20 .
• The 8000 Display/Controller PCB assembly is factory configured to
an IR range of either 1,000 or 10,000 ppm CO
2
and a liquid range
between 0–5 mg/L and 0–20,000 mg/L TOC. Connection to the IR
block uses a 25-way ribbon D connector. Connection to the 8001 I/O
is via a ribbon cable.
• The 8001 I/O Termination PCB assembly provides the connection
point for five function-mapped relays and/or two parameter-mapped
4-20 mA analog outputs.
• The power supply, from an input of 115 V ac or 230 V ac, provides
115 V ac for the pumps and 24 V dc for the rest of the electronics. The
power supply is shown in
Figure 3 on page 19 .
All user connections inside the electronics enclosure are screw
down terminals.