1-15). This assembly is marked
to identify power, ground and
signal connections. This wiring
harness can contain two or
three wires, depending on
sensor type and/or output
selected (see FIGURE 1-6 for
sensor type):
• A two-wire connection is
required for certain:
• Toxic Gas models
with 4 to 20 mA
output
• Oxygen models with
4 to 20 mA output
• A three-wire connection is
required for all:
• Combustible Gas
models
• Multiplex models
• Frequency Output
models
• Three-wire Toxic
and Oxygen Models
with 4 to 20 mA
output, that are to be
operated in
connection with
Ultima accessory
functions (relays,
pumps, etc.).
If it is not possible to
use the wiring harness,
open the unit and
disconnect the wiring
harness from terminal
block TB1 on the lower
printed circuit board; see
FIGURE 1-16 for wiring
details.
Figure 1-14.
Two-Wire Harness Assembly
Figure 1-15.
Three-Wire Harness Assembly
Figure 1-16.
Bottom Circuit Board
Chapter 1, Set-up
1-11
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