Instruction Manual

Instruction Manual
748213-S
April 2002
Rosemount Analytical Inc. A Division of Emerson Process Management Installation 2-3
Model 755R
Figure 2-1. Interconnect of Typical Gas Manifold to Model 755R
b. Pressure Requirements - General
Operating pressure limits are as follows:
maximum, 10 psig (68.9 kPa); minimum,
5 psig vacuum (34.5 kPa vacuum).
CAUTION
RANGE LIMITATIONS
Operation outside the specified pressure
limits may damage the detector, and will
void the warranty.
The basic rule for pressure of sample and
standard gases supplied to the inlet is to
calibrate the analyzer at the same pres-
sure that will be used during subsequent
operation, and to maintain this pressure
during operation. The arrangement re-
quired to obtain appropriate pressure
control will depend on the application.
When inputting sample or calibration
gases, use the same pressure that will be
used during subsequent operation. Refer
to Section 2-3c (page 2-3), Normal Op-
eration at Positive Gauge Pressures, or
Section 2-3d (page 2-4) Operation at
Negative Gauge Pressures.
c. Normal Operation at Positive Gauge
Pressures
Normally, the sample is supplied to the
analyzer inlet at a positive gauge pres-
sure in the range of 0 to 10 psig (0 to 68.9
kPa).
CAUTION
HIGH PRESSURE GAS CYLINDERS
Pressure surges in excess of 10 psig dur-
ing admission of sample or standard
gases can damage the detector.
Maximum permissible operating pressure
is 10 psig (68.9 kPa). To ensure against
over-pressurization, insert a pressure re-
lief valve into the sample inlet line. In ad-
dition, a check valve should be placed in
the vent line if the analyzer is connected
to a manifold associated with a flare or
other outlet that is not at atmospheric
pressure. If the detector is over-
pressurized, damage will result.
The analyzer exhaust port is commonly
vented directly to the atmosphere. Any
change in barometric pressure results in a
Zero
Standard
Gas
Span
Standard
Gas
Sample In
Needle
Valves
Flowmeter
Two Micron
Filter
Model 755R
Oxygen Analyzer
To Vent