Rosemount 755R, Инструкция по эксплуатации

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I
NSTALLATION
2-4
June 1997 Rosemount Analytical 748213-P Model 755R Oxygen Analyzer
CAUTION: RANGE LIMITATIONS
CAUTION: HIGH PRESSURE GAS
2.3.1 S
AMPLE
T
EMPERATURE
R
EQUIREMENTS
Sample temperature at the analyzer inlet should be in the range of 50
°
F to 150
°
F
(10
°
C to 66
°
C).
Normally, however, a maximum entry temperature of 110
°
F (43
°
C) is recommended
so that the sample temperature will rise during passage of the sample through the
analyzer. This precaution prevents cooling of the sample and possible
analyzer-damaging condensation. With a thoroughly dry sample, entry temperature
can be as high as 150
°
F (66
°
C) without affecting readout accuracy.
2.3.2 S
AMPLE
P
RESSURE
R
EQUIREMENTS
: G
ENERAL
Operating pressure limits are as follows: maximum, 10 psig (68.9 kPa); minimum, 5
psig vacuum (34.5 kPa vacuum).
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 pressure that will be used during subsequent
operation, and to maintain this pressure during operation. The arrangement required
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 2.3.3, Normal Operation at Positive Gauge
Pressures, or Section 2.3.4, Operation at Negative Gauge Pressures.
2.3.3 N
ORMAL
O
PERATION AT
P
OSITIVE
G
AUGE
P
RESSURES
Normally, the sample is supplied to the analyzer inlet at a positive gauge pressure in
the range of 0 to 10 psig (0 to 68.9 kPa).
Pressure surges in excess of 10 psig during 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 relief valve into the sample inlet line. In addition,