2
I
NSTALLATION
748213-P Rosemount Analytical June 1997
2-1
Model 755R Oxygen Analyzer
2.1 FACILITY PREPARATION
Observe all precautions given in this section when installing the instrument.
2.1.1 I
NSTALLATION
D
RAWINGS
For outline and mounting dimensions, gas connections, and other installation
information, refer to Installation Drawing 654015 at the back of this manual.
2.1.2 E
LECTRICAL
I
NTERCONNECTION
D
IAGRAM
Electrical interconnection is also shown in drawing 654015. Refer also to Section 2.4.
2.1.3 F
LOW
D
IAGRAM
The flow diagram of Figure 2-1 shows connection of a typical gas selector manifold to
the Model 755R.
2.1.4 L
OCATION AND
M
OUNTING
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 pressures 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 detector, the
sample is preheated by passage through a coil maintained at approximately the
same temperature as the detector (See Figure 5-3, A).
3. The detector is maintained at a controlled temperature of 150
°
F (66
°
C).
Also, avoid excessive vibration. To minimize vibration effects, the detector/magnet
assembly is contained in a shock-mounted compartment.
