BLUE M
Blue M - - DC 146 Series Industrial Ovens, Models DC, DCW, DCI, DCC
Page 49
8.0 OXYGEN ANALYZER / TRANSMITTER
O
tional
8.1 Overview
When an inert gas atmosphere is employed (Model DCI & DCC), it may be necessary to monitor the amount
of oxygen present in the chamber atmosphere for safety or process control reasons. In an alarm condition,
the heating system would be shut down and audible /visual alarms will be activated. One of the following
Alpha Omega Oxygen Analyzers / Transmitters may be employed.
Series 2000 Percent Oxygen Analyzer
Series 2510 Percent Oxygen Transmitter
Series 3000 Trace Oxygen Analyzer
Series 3510 Trace Oxygen Transmitter
8.2 Equipment Operation
The analyzer / transmitter samples process air through a line that runs from the pressure relief valve fitting
with Model DCI ovens, or from the vent port fitting with Model DCC ovens. Both fittings are on top of the
oven. A flowmeter provides indication of the sample flow rate experienced by the analyzer / transmitter unit.
The units employ a sensor which is a lead-oxygen battery consisting of a gold plated cathode and a lead
anode fully self-contained in an electrolyte solution. As a small amount of oxygen permeates through a
Teflon membrane of the sensor it is reduced electro-chemically at the gold electrode. A resistor and a
thermistor (for temperature compensation) are connected between the cathode and anode. As a result, the
lead oxygen battery is always discharged. Current flowing through the resistor and thermistor is proportional
to the oxygen concentration of the gas in contact with the Teflon membrane. By measuring the voltage
between the resistor and thermistor, oxygen concentration can be accurately determined.
SERIES 3510 TRACE OXYGEN TRANSMITTER
SERIES 2000 PERCENT ANALYZER
Flowmeter
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