Teledyne 326, 327 and 328 - Oxygen analyzers - Manual (Page 11)

1-5 Teledyne Analytical Instruments
Introduction Introduction Introduction Introduction Introduction Model 326/327/328 Model 326/327/328 Model 326/327/328 Model 326/327/328 Model 326/327/328
against the interconnection diagram. against the interconnection diagram. against the interconnection diagram. against the interconnection diagram. against the interconnection diagram.
1.7 Standard Features
The following features apply to the standard 326 series analyzers. Since
design features do vary in accordance with customer requirements, check design features do vary in accordance with customer requirements, check design features do vary in accordance with customer requirements, check design features do vary in accordance with customer requirements, check design features do vary in accordance with customer requirements, check
the Specific Application Information, and any addendums
the Specific Application Information, and any addendums the Specific Application Information, and any addendums the Specific Application Information, and any addendums the Specific Application Information, and any addendums included in this
manual, where the distinctive features of your instrument are recorded.
1.7.1 Ranges of Analysis 1.7.1 Ranges of Analysis 1.7.1 Ranges of Analysis 1.7.1 Ranges of Analysis 1.7.1 Ranges of Analysis
The ranges of analysis for standard instruments are 0-5 %, 0-10 %, and
0-25 % oxygen. A rotary switch on the control panel is used to select the
desired analysis range. The standard instrument ranges have been chosen to
best cover the oxygen content of flue gas. Upon request at the time the
order is placed, any range or ranges of analysis from 0-1 % up to 0-100 %
oxygen can be provided.
The oxygen content of atmospheric air (20.9 %) falls within the 0-25 %
range. It is recommended for calibration because it eliminates the need for a
span gas. Note, however, that a span gas is required, if the air around the
analysis unit cannot be used to span the instrument (as in hazardous loca-
tions), or if an instrument is ordered without the 0-25 % calibration range.
1.7.2 Meter Readout 1.7.2 Meter Readout 1.7.2 Meter Readout 1.7.2 Meter Readout 1.7.2 Meter Readout
Standard models are equipped with an accurate (±1/2 % linearity)
3-inch analog meter calibrated to show the concentration of the target gas in
the sample. A linear scale provides reliable, accurate readout of the analysis
at any point on the scale. The resolution and accuracy of the meter elimi-
nates the necessity of an accessory readout device, unless permanent re-
cording or remote indication is required. Digital panel meters are used
when requested by the customer.
1.7.3 Output Signal 1.7.3 Output Signal 1.7.3 Output Signal 1.7.3 Output Signal 1.7.3 Output Signal
For those applications requiring a remote indication and/or recording of
the sample oxygen, a linear output signal of 0–1 V dc is available at no extra
charge. Unless otherwise specified, the output signal will be 0–1 V dc .
The standard voltage output signal is not suitable for driving low imped-
ance devices. Accessory equipment must have an input impedance of
10,000 ohms or more. Refer to the Current Output (E to I Converter)
section later in this chapter for information on that option.