Teledyne 3220 - Multi-channel oxygen monitor system - Manual (Page 31)

Oxygen Monitor System 3 Installation
Teledyne Analytical Instruments 17
3.3 Electrical Connections
The primary power terminals are designated H (hot), N (neutral)
and GND (ground). Connections should be made in accordance with
these designations.
All electrical connections are available at the barrier-type terminal
strips located at the rear of the control unit. These facilities are shown
on the user interconnection
drawing D-17388 .
WARNING: DISCONNECT PRIMARY POWER BEFORE
MAKING OR CHANGING CONNECTIONS TO ANY
OF THE TERMINAL STRIPS.
Relay contact connections are indicated as NC (normally closed),
NO (normally open) and C (common). These designations refer to the
contact state when the relay is de-energized.
Sensor connections are indicated as RD (red), WH (white), BK
(black) and GN (green). These designations refer to the color of the
probe lead wires.
NOTE:The cable shield should be connected to ground only at one end
of the cable (this applies to each probe connection). See Figure
3-1.
Care must be observed to ensure that the probe leads are not
inadvertently connected to the signal common (C) or to the power
ground while energized. (See Figure 3-1)
3.4 Probe Assemblies
The remote probe assemblies are designated to be flush mounted
against a wall or bulkhead (see the outline drawing at the back of this
manual for dimensional details). Although the Micro-fuel Cell is
position insensitive, it is recommended that the probe assemblies be
mounted in either a horizontal or vertical position with the sensing
surface pointing sideways or downward, vertical position being
preferred and strongly recommended. These positions minimize the
effects of particulate matter or water that could deposit or condense on
the end of the sensing surface when mounted in an upright vertical
position.