811-1005-E01 Datasheet, PDF (12/28 Pages) Magnetrol International, Inc. – Kotron® Model 811 RF Point Level Sensor

RELAY LED
COM (DC-)
HOT (DC+)
GND
(Green
ground
screw
in base)
9
I.S. BARRIER
1.7.2 Electrical Wiring
1. Connect power leads to applicable AC or DC terminals as
marked. Refer to Figure 13.
2. a. Connect control circuit leads to relay terminals Refer to
Figure 13. Make sure the load to be controlled is with-
in the relay’s rated capacity.
b. Dress wiring to guard against interference or contact
with cover or circuit board components.
Figure 13
Caution: In hazardous area, do not power the unit until the conduit
is sealed and enclosure cover is screwed down securely.
NC
3. Prevent moisture seepage into housing by installing an
COM
approved seal-drain fitting in the conduit run leading to
NO
NC
the unit.
COM _{4. Select operating mode. (Refer to Operating Mode}
NO
Selection below for detailed information.) Make sure
the fail-safe switch is in the correct position.
5. Installation is complete. Replace housing cover.
6. Proceed to Calibration, Section 1.8, on next page.
Figure 14
1.7.3 Operating Mode Selection
The Relay Wiring Chart on page 10 is provided to aid
in the proper choice of relay wiring and calibration.
Please note:
1. Equipment controlled by the Model 811 relay is assumed
to be powered from one source, while the 811 unit itself is
assumed to be powered from a different source.
2. There is a fail-safe switch on the 811 unit which may be
set in either a High or Low position. Refer to Figure 15
on next page.
3. Fail means a loss of power to the 811.
4. HL (High Level) means a material level in the tank which
is equal to or above the set point.
5. LL (Low Level) means a material level in the tank which is
equal to or below the set point.
6. a. When the relay coil is de-energized, (LED will be off )
a connection is made between the common (COM)
and normally closed (NC) terminals, and there is no
connection between COM and normally open (NO)
terminals.
b. When the relay coil is energized, (LED will be on)
a connection is made between the COM and
NO terminals, and there is no connection between
COM and NC terminals. Refer to Relay Wiring Chart,
Section 1.7.4, on next page.
50-608 Kotron Model 811 RF Point Level Sensor