Teledyne TRACE OXYGEN ANALYZER 356WA - Manual (Page 6)

1-2
1 Introduction 1 Introduction 1 Introduction 1 Introduction 1 Introduction Model 356W Model 356W Model 356W Model 356W Model 356WA A A A A
Teledyne Analytical Instruments
1.2 1.2 1.2 1.2 1.2 Required Equipment Required Equipment Required Equipment Required Equipment Required Equipment
For proper operation, the analyzer may require accessory equipment,
particularly in the area of sample conditioning. The need for additional
equipment is dictated by the conditions of each application.
1.2.1 1.2.1 1.2.1 1.2.1 1.2.1 Sample Conditioning Sample Conditioning Sample Conditioning Sample Conditioning Sample Conditioning
The sample must be free of entrained solids and condensable vapors,
and be at a relatively constant pressure between 1 and 100 psig 1 and 100 psig 1 and 100 psig 1 and 100 psig 1 and 100 psig. However,
more efficient operation is obtained with pressures in the range of 5 to 10 5 to 10 5 to 10 5 to 10 5 to 10
psig psig psig psig psig. Pressure surges can carry fluid from the humidifier into the cell and
impair cell operation. Filters, scrubbers, or pressure regulators are often
necessary, depending on local conditions.
1. 1. 1. 1. 1. Filters. Filters. Filters. Filters. Filters. If filters are necessary, they should be conveniently
located near the analyzer, and installed in a fashion which permits
easy removal for periodic cleaning or replacement.
2. 2. 2. 2. 2. Scrubbers. Scrubbers. Scrubbers. Scrubbers. Scrubbers. If the sample contains small quantities of acidic
anhydrides (SO
2
, etc.) or mercaptans (H
2
S, etc.) they will react
with the electrolyte or the cathode, and must be removed. A
caustic scrubber is usually effective.
3. 3. 3. 3. 3. Pressure regulators. Pressure regulators. Pressure regulators. Pressure regulators. Pressure regulators. While the analyzer will accept pressures to
100 psig, a range of 5 to 10 psig
5 to 10 psig 5 to 10 psig 5 to 10 psig 5 to 10 psig is recommended. In addition,
pressure surges can affect instrument operation. In either case, the
use of a pressure regulator is advisable. Install the regulator as
close to the sample point as possible to reduce sample travel time
to a minimium. The regulator should incorporate a metallic
diaphragm to prevent the diffusion of atmospheric oxygen into
the sample.
1.2.2 1.2.2 1.2.2 1.2.2 1.2.2 Recorder /Meter Readout Recorder /Meter Readout Recorder /Meter Readout Recorder /Meter Readout Recorder /Meter Readout
The meter installed on the 356WA is either analog or digital. The
recorder used for analyzer signal readout is usually of the self-balancing
potentiometric type. It should have an input inpedance of 10
10 10 10 10
Ω Ω Ω Ω Ω
or higher.
Output is 0 to 1VDC or less (optional: 1 to 5, 4 to 20, or 10 to 50 mADC).