MN301905 Rev A
27
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Wire Sensor
Step Four
REMOVE THE DISPLAY
To access the terminal strip and conduit ports, you
must remove the display. Gently twist the display
counter-clockwise until you feel the display unlock
from the housing. Next, lift the display from the
housing to view the terminal strip and wire access
ports.
Note: This procedure applies to all sensors.
Note: There is an internal configuration difference between displays used by
the EchoPro
®
sensors (LR36, LR41 & LR46 series) versus the display used
with the LR98 series. A colored dot on the back marks displays to be used
only with the LR98 series. Never swap displays between the LR98 series
and other EchoPro
®
sensors.
SUPPLY VOLTAGE
The sensor power supply and current signal share the same two-wire shielded cable. The sensor supply
voltage should never exceed 26.4 VDC. Always provide complete electrical and physical separation between
the sensor supply circuit and the main circuit.
Note: Remember that the output voltage of the power supply
can be lower under nominal load (with a sensor current of 20.5 mA or 22 mA) and/or with the addition of other
instruments placed within the circuit. If voltage spikes or surges are expected, adequate isolation protection
must also be provided.
TERMINAL WIRING
The positive (+) and Negative (-) terminals are for connection to a 24 VDC power supply or to a 4-20 mA loop
power source. The wire to the terminals can be extended up to 1,000 feet using 22 gauge or larger wire.
The sensor should be wired with shielded 2-conductor cable (16 to 22 AWG) to protect from electromagnetic
interference. If using a liquid tight connector, select a cable with an outer diameter that is designed to ensure
an effective seal with the connector [typically between 0.20” to 0.35” (5 to 9 mm)].
ELECTRICAL, USAGE AND SAFETY
1.
Wiring should always be done by a licensed electrician in accordance with national, state and local codes.
2. Where personal safety or significant property damage can occur due to a spill, the installation must
have a redundant fail-safe backup system installed which accounts for sensor and/or power failure.
