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> Duplex pumping systems /time mark m# 403 liq lvl. cont.
Duplex pumping systems /time mark m# 403 liq lvl. cont.
l Selectable lead/lag or automatic
The Model 403 Liquid Level Controller provides central
control of duplex pumping systems. The Model 403
includes pump alternating, visual run-time meters, handoff-
auto (HOA) controls and alarm outputs.
Four level-sense inputs interface with float switches,
pressure switches, or other level sensing devices which
can provide a contact closure.
A SPST, normally-closed internal power-fail contact opens
when AC power 120 VAC is connected to the controller,
and closes if power is lost or removed. Connections for
external remote alarm contacts, which must remain closed
for normal operation (or jumpered if not required), are
If either circuit opens, the corresponding pump will be
locked out until the problem is corrected and the ‘Alarm
Power consumption 10 Watts max.
Contact rating 10A at 240 VAC resistive
Float Switch Potential 12 VDC at 1 mA
Transient protection 2500 V for 10 msec
Operating temperature - 40º to +140º F
Display to 99,999.9 non-resettable
Humidity tolerance 0-97% without condensation
Expected relay life Mechanical: 10 million operations
Electrical: 100,000 operations at rated load
Termination Removable terminal strip
