I
NSTALLATION
2-2
June 1997 Rosemount Analytical 748332-DNGA Non-Dispersive Infrared Analyzer
Lift the spring-loaded pins on the front of the Analyzer Module, and carefully slide it
the rest of the distance. Secure the module in position by releasing the pins, which
seat in the available holes in the bottom of the case (see Figure 2-1). If the module
and Platform are difficult to assemble, remove the module, ensure the top cover of the
module is firmly seated on the hold-down screws, and repeat the assembly procedure.
Install I/O Module(s) according to guidelines in the I/O manual. After startup and
calibration have been performed, secure the front panel with the six screws provided.
2.3 LOCATION
Install the NDIR Analyzer Module in a clean, non-hazardous, weather protected,
vibration free location free from extreme temperature variations. For best results,
install the instrument near the sample stream to minimize sample transport time.
Operating ambient temperature is 0
o
C to 45
o
C (32
o
F to 113
o
F). Sample dewpoint is
40
°
C or less.
Note
Unrestricted air flow in the rear of the Analyzer Module is critical to its
performance and reliability.
T
ABLE
2-1. C
ELL
P
URGING
T
IMES AT
A
TMOSPHERIC
S
AMPLE
P
RESSURE
2.4 GASES
2.4.1 S
PECIFICATIONS
C
ALIBRATION
G
ASES
All applications require a zero standard gas to set the zero point on the display and
external data acquisition devices. if the factory provided Calibration and Data Sheet
CELL LENGTH CELL VOLUME
IN CC
TOTAL VOLUME IN
CC
TIME FOR 2 VOLUMES AT
2 SCFH (1L/MIN)
mm inch without inlet tube cell with inlet tube at 750 mm Hg
3 0.118 0.85 12 2 sec.
4 0.157 1.14 12 2 sec.
8 0.315 2.28 13 2 sec.
16 0.630 3.56 16 2 sec.
32 1.25 9.12 20 2 sec.
64 2.52 18.24 25 3 sec.
128 4.03 35.48 44 3 sec.
232 9.13 65.12 73 6 sec.
343 13.50 97.76 105 13 sec.
381 15.00 108.60 116 14 sec.
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