810-0005-D01 Datasheet, PDF (8/16 Pages) Magnetrol International, Inc. – Kotron® Model 810 RF Point Level Sensor

Figure 7
Relay LED
OPERATING MODE SELECTION
The chart below is provided to aid in the proper choice of
relay wiring and calibration. Please note:
1. Equipment controlled by the relay is assumed to be pow-
ered from one source, while the Model 810 itself is
assumed to be powered from a different source.
2. There are fail-safe switches on the switch which may be set
in either a High or Low position. Refer to Figure 7.
3. “Fail” means a loss of power to the 810 unit.
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.
6a. When relay coil is de-energized (fail-safe) the circuit
between common (COM) and the normally open (NO)
terminal is open and a connection is made between
common (COM) and the normally closed (NC) terminals.
The LED is off.
6b. When the relay coil is energized the NO contact is closed
and the NC contact is open. The LED is on. Refer to the
Relay Wiring Chart below.
Level control
(R4)
Fail-safe switches
Time delay
switches between
1 and 2
Time delay
control (R9)
RELAY WIRING CHART
Kotron Material Fail-safe
Power Level Position
Relay
Coil
Relay Terminal
CM to NC CM to NO
High
On
Low
HL De-energized Closed
LL
Energized Open
HL
Energized
Open
LL De-energized Closed
Open
Closed
Closed
Open
High
Fail
Low
HL De-energized Closed
LL De-energized Closed
HL De-energized Closed
LL De-energized Closed
Open
Open
Open
Open
5
50-607 Kotron Model 810 RF Point Level Sensor