502-3000 Series Ztron
TM
Point Level Control
Installation
14
2.4 Wiring the Relays
Refer to Figure 2-10 for the relay contact wiring. The Ztron
relay has double-pole, double-throw (DPDT) dry contacts. The
relay serves as a switch and does not provide the power to
operate an annunciator or other equipment. All relay connec-
tions are made to the terminal strip on the electronic unit.
N.C. =
Normally Closed
N.O. =
Normally Open
Figure 2-10
Wiring the
Relays
LED ON
1 2 3 4 5 6 7 8 9
1 2 3 4 5 6 7 8 9
1 2 3 4 5 6 7 8 9
1 2 3 4 5 6 7 8 9
HIGH LEVEL
FAIL-SAFE
LED ON
TANK EMPTY
HIGH LEVEL
FAIL-SAFE
LED OFF
(ALARM)
TANK FULL
LOW LEVEL
FAIL-SAFE
LED OFF
(ALARM)
TANK EMPTY
LOW LEVEL
FAIL-SAFE
TANK FULL
HIGH LEVEL
FAIL-SAFE
HIGH LEVEL
FAIL-SAFE
LOW LEVEL
FAIL-SAFE
LOW LEVEL
FAIL-SAFE
Level Below Sensing Element
Level Above Sensing Element
Level Below Sensing Element
Level Above Sensing Element
