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Instruction Manual
748213-S
April 2002
Rosemount Analytical Inc. A Division of Emerson Process Management Installation 2-1
Model 755R
SECTION 2
INSTALLATION
2-1 FACILITY PREPARATION
Observe all precautions given in this section
when installing the instrument.
a. Installation Drawings
For outline and mounting dimensions, gas
connections, and other installation infor-
mation, refer to Installation Drawing
654015 at the back of this manual.
b. Electrical Interconnection Diagram
Electrical interconnection is also shown in
drawing 654015. Refer also to Section 2-
5, page 2-6.
c. Flow Diagram
The flow diagram of Figure 2-1 (page 2-3)
shows connection of a typical gas selector
manifold to the Model 755R.
d. Location and Mounting
Install the Model 755R only in a
non-hazardous, weather-protected area.
Permissible ambient temperature range is
32°F to 113°F (0°C to 45°C). Avoid
mounting where ambient temperature
may exceed the allowable maximum.
Magnetic susceptibilities and partial pres-
sures of gases vary with temperature. In
the Model 755R, temperature-induced
readout error is avoided by control of
temperatures in the following areas:
1. Interior of the analyzer is maintained
at 140°F (60°C) by an electrically
controlled heater and associated fan.
2. Immediately downstream from the
inlet port, prior to entry into the de-
tector, the sample is preheated by
passage through a coil maintained at
approximately the same temperature
as the detector (See Figure 4-3A,
page 4-7).
3. The detector is maintained at a con-
trolled temperature of 150°F (66°C).
Also, avoid excessive vibration. To mini-
mize vibration effects, the detec-
tor/magnet assembly is contained in a
shock-mounted compartment.
WARNING
POSSIBLE EXPLOSION HAZARD
This analyzer is of a type capable of analy-
sis of sample gases which may be flam-
mable. If used for analysis of such gases,
internal leakage of sample could result in
an explosion causing death, personal in-
jury, or property damage. Do not use this
analyzer on flammable samples. Use ex-
plosion-proof version instruments for
analysis of flammable samples.
Use reasonable precautions to avoid ex-
cessive vibration. In making electrical
connections, do not allow any cable to
touch the shock-mounted detector as-
sembly or the associated internal sample
inlet and outlet tubing. This precaution
ensures against possible transmission of
mechanical vibration through the cable to
the detector, which could cause noisy
readout.