I
NSTALLATION
2-6
June 1997 Rosemount Analytical 748213-P
Model 755R Oxygen Analyzer
WARNING: POSSIBLE TOXIC OR CORROSIVE HAZARD
smaller. If deviation is held to within these parameters and operating pressure remains
constant, zero and span drift will remain within specification limits.
The analyzer should be installed near the sample source to minimize transport time.
Otherwise, time lag may be appreciable. For example, assume that sample is supplied
to the analyzer via a 100-foot (30.5 m) length of 1/4-inch (6.35 mm) tubing. With a flow
rate of 100 cc/min, sample transport time is approximately 6 minutes.
Sample transport time may be reduced by piping a greater flow than is required to the
analyzer, and then routing only the appropriate portion of the total flow through the
analyzer. The unused portion of the sample may be returned to the stream or
discarded.
2.3.6 M
ATERIALS IN
C
ONTACT WITH
S
AMPLE
Within the Model 755R, the following materials are exposed to the sample: 316
stainless steel, glass, titanium, Paliney No.7, epoxy resin, Viton-A, platinum, nickel
and MgF
2
coating on mirror.
2.3.7 C
ORROSIVE
G
ASES
In applications where the sample stream contains corrosive gases, a complete drying
of the sample is desirable, as most of these gases are practically inert when totally
dry. For corrosive applications consult the factory.
2.3.8 L
EAK
T
EST
The sample containment system must be carefully leak checked upon
installation and before initial start-up, during routine maintenance and any time
the integrity of the sample containment system is broken, to ensure the system
is in leak proof condition.
Internal leaks resulting from failure to observe these precautions could result in
personal injury or property damage.
For proper operation and safety, system leakage must be corrected, particularly
before introduction of toxic or corrosive samples and/or application of electrical power.
To check system for leaks, liberally cover all fittings, seals, and other possible sources
of leakage with suitable leak test liquid such as SNOOP (P/N 837801). Check for
leak-indicative bubbling or foaming. Leaks that are inaccessible to SNOOP application
could evade detection by this method.
