Appendix A – System Options | A-3
Electrical Connections
The external water signal to the analyzer must be a 4–20 mA input.
To display this signal on the User Interface, connect a 4–20 mA external
water signal to the spare analog input Terminals 12+ and 13- on connec-
tor J101 on the Termination board in the Ex d Electronics Enclosure.
If required, this signal can be remotely displayed, such as from a Data
Acquisition System. In this case, the 4–20 mA external water signal is still
connected to spare analog input Terminals 12+ and 13- on connector
J101. The external water signal must be retrieved by the remote display
device via a loop-powered or self-powered V/I from the analyzer. For con-
nections to the remote display device, use output Terminals 2+ and 3- for
water dewpoint or 6+ and 7- for water content on connector J101.
Calibrating the Voltage Input
Before the analyzer can accurately output the external water signal, or at
any time the input ranges for these outputs have been changed, certain
analyzer parameters must be configured and calibrated.
To configure the analyzer to display external water dewpoint or external
water content on its User Interface:
1. From the MonitorCFG menu, make the following changes:
a. View the Water Measurement Option sub-menu.
To display the external water dewpoint measurement, press ‘+’ or
‘–’ to enable H2O DP:EXT (external water dewpoint).
To display the external water content measurement, press ‘+’ or ‘–’
to enable H2O CT:EXT (external water content).
b. View the PLo sub-menu and press ‘–’ to change the setting to
-1.0 KPA. This will disable pressure signals from being displayed
on the User Interface.
Leave the PHi at the default value of 13790 KPA.
c. View the ExLo sub-menu and change it to the external device’s
low output range for either water signal (water dewpoint or water
content).
View the ExHi sub-menu and change it to the external device’s
high output range for either water signal (water dewpoint or wa-
ter content).
RUN Mode
MonitorCFGWater
Measurement Option
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