Outputs and Remote Connections DF-150E 45
ground loops, the shield should be left open and not attached to the remote
sensor chassis. The polarity must be maintained on the Sensor + and Sensor -
connections.
9.2.2 Secondary Electrodes (Sec El +, Sec El -)
If the sensor is located remotely from the analyzer, the secondary electrode
connections on the sensor should be wired through a shielded, twisted pair
cable. The shield should be terminated at the Ground stud on the analyzer back
panel. To avoid ground loops, the shield should left open and not attached to
the remote pump chassis. The polarity must be maintained on the Sec El + and
- connections.
9.2.3 A, B (A, B)
The auxiliary terminals A & B are used to provide the switch contacts for the
Low Flow switch (internal of remote) if equipped. The contacts are rated at
120 VAC or 120 VDC at 0.5 A resistive.
9.2.4 Flow Switch (Flow SW, Flow SW Com)
When a remote sensor is equipped with a flow switch, it can be wired to the
analyzer through the terminals on the Remote Sensor connector labeled Flow
Sw. It should be wired through a shielded, twisted pair cable of sufficient size
for the required run. See Table 6 for wire sizes.
9.3 Pump Control Connector
Figure 27: Pump Control Connector
9.3.1 Pump Control
(Not available on CE Qualified analyzers.)
The Pump Control Connector is optional. It can be factory configured to allow
a user-provided switch to provide remote control of an on-board pump or to
power and control a remote pump. The specific analyzer configuration is
indicated on the label above the pump control connector. An on-board pump
can always be controlled by the pump switch located behind the front door.
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