Installation
Hardware Installation and Maintenance Manual 3
–17
Changing the 4-20 mA Current Loop Mode
By default, the 4-20 mA current loop output is factory set to source current. In
some instances it may be necessary to change the 4-20 mA current loop output
in the field from source to sink. The work must be performed by personnel
qualified in electronics assembly.
Tochangea4‐20mAboardfromsourcetosink
1. Disconnect power to the analyzer and open the electronics enclosure
cover. Take care not to disturb the electrical assembly inside.
2. Locate the 4-20 mA board(s) on the electronics assembly panel in
the center of the electronics enclosure, as shown in Figure 1–6,
Figure 1–7, Figure 1–8, Figure 1–10 or Figure 1–11.
3. Remove the jumper (JMP1) connecting the center pin to pin A. Refer
to Figure 3–7.
Changing the current loop mode may negate specific hazardous
area certifications. Refer to “Service Contact” on page B-23 to
connect with Technical Service support for details.
Figure 3–7 4-20 mA output board
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