U
NPACKING AND
I
NSTALLATION
2-4
October 1999 Rosemount Analytical 748250-L
Model 880A Non-Dispersive Infrared Analyzer
2.4.2 R
ECORDER
C
ONNECTIONS
Refer to Figures 2-3, 2-4 and drawing 624190. Recorder connections are made to the
rear panel. Route the recorder cable through the cable gland in hole labeled
RECORDER OUTPUT and connect to TB2.
Recorder and interconnection cables should meet the following requirements:
V
OLTAGE
O
UTPUT
: 0
TO
+5 VDC
•
Maximum distance from recorder to analyzer: 1000 ft. (305 m)
•
Recorder input impedance: >5000 ohms
•
Customer-supplied cable: 2-conductor, 20 AWG (min.), shielded
C
URRENT
O
UTPUT
: 0
TO
20
M
A
OR
4
TO
20
M
A (
KEYBOARD PROGRAMMABLE
)
•
Maximum load impedance: 700 ohm
2.5 SAMPLE INLET/OUTLET CONNECTIONS
Most applications of the Model 880A are intended for atmospheric pressure operation
with venting to the atmosphere. High pressure and sub-atmospheric pressure
applications require careful regulation of the sample pressure. Sample inlet and outlet
connections are located on the rear panel. All connections are 1/4-inch ferrule-type
compression fittings.
2.6 CALIBRATION GAS REQUIREMENTS
Analyzer calibration consists of setting a zero point and one upscale point per range.
All applications require a zero standard gas to set the zero point on the display or
recorder chart.
If the factory Calibration and Data Sheet (included with the drawings at the end of the
manual) specifies a background gas, use this as the zero gas. If a background gas is
not specified, use dry nitrogen for the zero gas.
Ideally, span gas should be between 75% and 100% of the fullscale span.
2.7 SAMPLE HANDLING SYSTEM
Many different sample handling systems are available, either assembled completely or
as loose components. The type used depends on the requirements of the particular
application and the preferences of the individual user. Typically, the sample handling
system incorporates such components as pumps and valves to permit selection of
sample, zero standard and upscale standard gas; needle valve in sample-inlet line for
flow adjustment; flowmeter for flow measurement and/or indication of flow stoppage;
and filter(s) to remove particulate matter.
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