U
NPACKING AND
I
NSTALLATION
748250-L Rosemount Analytical October 1999
2-11
Model 880A Non-Dispersive Infrared Analyzer
2.11 ORDERING OPTION KITS
Options not ordered from the factory at the time of purchase of the Model 880A may
be ordered as the following kits:
•
624422 Isolated Remote Control Kit
•
624423 Dual Alarm Kit
•
654399 Fail Safe Dual Alarm Kit
•
624424 Auto Zero/Span Control Kit
•
624426 Calibration Gas Control Kit
•
624425 Current Output Kit
The option kit consists of the circuit board, a cable gland and two circuit card guides
which are inserted into predrilled holes in the card cage. Mount the option board in the
card guides and follow the wiring directions in Section 2.10. There are five connectors
on the interconnect cable. Ensure that the appropriate connections are made.
For installation of any of the above Option Kits, the Option Boards Kit, P/N 624414,
must also be ordered. If the analyzer was originally ordered with any of the above
options, the Accessory Kit is already installed and need not be ordered again for
additional options. This kit consists of a card cage which mounts in the rear of the
case and three interconnect cables for internal wiring as shown in drawing 655147.
2.12 MOTOR SOURCE/REFERENCE CELL PURGE KITS
Model 880A configurations 23 and 26 are often equipped with the Motor Source
Assembly Purge Kit (P/N 655095) for reducing CO
2
interference.
Optimum purge flow is 100 cc/min, optimum pressure is 8 psig. The pressure should
not exceed 10 psig.
Nitrogen is recommended for the purge gas. If available gas is limited, flow may be
reduced, but reading errors become significant below 20 cc/min. At 50 cc/min., errors
may exceed 1% of fullscale.
The purge uses capillary 634398, tested to 70 cc/min. (
±
10 cc/min.) at 4 psig.
Configuration 46 instruments are equipped with a Motor Source/Reference Cell Purge
Kit as standard.
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