Models 328R Description - Teledyne 328 Instruction Manual

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used to provide both the optional circuitry and the standard electronics
features of the analyzer.

1.5 Models 328R Description

Model 328R is a fully explosion-proof version of the Model 326R and is
completely contained in one or more explosion-proof enclosures as needed
to house the specific components used. Since both the electronics control
and the sample analysis sections of the analyzer must meet hazardous area
classification, they are normally enclosed in a single enclosure and fitted
with explosion-proof operators for switches and potentiometers. These
protrude through the sealed enclosure, which also has a viewing window to
allow observation of the measurement meter.
A commonly used option with the Model 328R is the gas selector panel.
The panel provides selection and flow control of sample or span gas. Sealed
connectors carry the selected gas to the measuring cell inside the explosion-
proof instrument enclosure.
1.6 Models 328RC Description
The Model 328RC Trace Oxygen Analyzer was designed to meet
CENELEC operating standards for European use.
The Model 328RC is housed in an explosion-proof enclosure with a
BASEEFA EExdIIBT6 rating. So that the explosion-proof enclosure does
not have to be opened, the span adjustment, range selection, and alarm
setpoint controls are placed on the exterior of the enclosure.
The analyzer has a separate probe that is attached to a control unit. The
control unit contains safety barriers (see Chapter 2 for more information).
Note: Note: If installed, safety barriers should always be used. It is the user's If installed, safety barriers should always be used. It is the user's
Note: Note: Note: If installed, safety barriers should always be used. It is the user's If installed, safety barriers should always be used. It is the user's If installed, safety barriers should always be used. It is the user's
responsibility for installing the probe in an appropriate sample responsibility for installing the probe in an appropriate sample
responsibility for installing the probe in an appropriate sample responsibility for installing the probe in an appropriate sample responsibility for installing the probe in an appropriate sample
system and protecting it from environmental factors such as tem- system and protecting it from environmental factors such as tem- system and protecting it from environmental factors such as tem- system and protecting it from environmental factors such as tem- system and protecting it from environmental factors such as tem-
perature and RFI. perature and RFI. perature and RFI. perature and RFI. perature and RFI.
The Model 328RC contains modular plug-in-type printed circuit boards
(PCB) for temperature regulation, voltage-to-current conversion, compara-
tor alarms, power supplies, and oxygen amplifier circuit. The plug-in PCBs
greatly enhance troubleshooting and repair, since entire circuits can be
stocked as spare parts.
Some of the PCBs contain calibration adjustments, which are shown on
the board schematics. For example, the meter is adjusted with a potentiom-
eter on the motherboard.
Note: Note: Note: Note: Note: Before supplying power to the analyzer, be sure to check the wiring Before supplying power to the analyzer, be sure to check the wiring Before supplying power to the analyzer, be sure to check the wiring Before supplying power to the analyzer, be sure to check the wiring Before supplying power to the analyzer, be sure to check the wiring
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Teledyne Analytical Instruments
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