PN 903-8797, Rev A
External Water Dewpoint/Content Option
An external water signal can be brought in to the analyzer and then displayed
(output) as water dewpoint temperature or water content on its User Interface
or designated V/I outputs.
To congure the analyzer to accept an external water signal and display
it on its User Interface, additional equipment must be installed on the
Microcontroller and Termination boards. Certain analyzer parameters must
also be calibrated to adjust input ranges.
Equipment Installation
The following equipment must be installed to allow the analyzer to accept an
external water signal.
If the external water signal is congured at the factory, the equipment
listed below will already have been installed before shipping. In this
case, only the electrical connections and calibration (voltage input)
will be required in the eld, as described in this section.
Equipment required to allow the analyzer to accept an external water signal
includes:
• An isolation module (AD202KN) must be installed in the voltage input
socket (U202) on the Microcontroller board.
• A loop-powered (AD1B21AN) or self-powered (1B22N) isolated V/I convert-
er must be installed in the water dewpoint socket (U700), or in the water
content socket (U702) on the Microcontroller board.
• A 1 %, 249 ohm resistor must be installed across the voltage input Termi-
nals (12+) and (13-) on connector J101 of the Termination board.
A-2 | 241CE II Hydrocarbon Dewpoint Analyzer
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