17
177-998D
T100 Series - Oil Level Monitor
The float switch (48) monitors the pump's oil level. The switch
is used to trigger an alarm or pump shutdown when a high or
low oil level is sensed in the pump's crankcase.
The T100 Low Pressure Pump uses one of two float switch (48)
configurations. The switch used can be identified by its wire lead
colors and part number.
The wiring diagram below shows the operating conditions and
wiring colors for each type of switch assembly.
1. Normally-Closed (NC) Switch.
The Normally-Closed Float Switch, 177-453-02 contains two
normally-closed (NC) reed switches
; one for high oil level, and
one for low oil level.
The (NC) float switch has solid Black,
striped Yellow/White, and striped Red/White wire leads
.
2. Normally-Open (NO) Switch.
The Normally-Open Float Switch, 177-453-03 contains two
normally-open (NO) reed switches
; one for high oil level, and
one for low oil level.
The (NO) float switch has solid Black, solid
Yellow, and solid Red wire leads.
Oil Level Monitor Float Switch
Conditions and Wiring Diagram
CAUTION: The float switch will only operate with crankshaft
rotation in the direction indicated on the pump casting.
Note: The numbers in parentheses are the Reference
Numbers shown in the Parts Section of the manual.
Note: The float switch (48) and adapter (47) can be removed
from the back cover without draining the pump’s oil. See
the Installation and Maintenance sections of the manual
for float switch set-up and use.
Note: The oil level should always be visible between the
high and low oil marks viewed on sight glass (42). If the
oil level reaches the high or low mark, the float switch will
be activated.
Low
Closed
Open
Normal
Closed
Closed
Open
Closed
Low
Open
Open
Normal
Closed
Open
High
Black (Common)
Yellow (High Oil Level)
Red (Low Oil Level)
Black (Common)
Yellow/White (High Oil Level)
Red/White (Low Oil Level)
Switch
conditions
shown for
normal
pump
operation
with float in
the middle
of the sight
glass.
High Switch
Low Switch
Oil Level
High
Closed
Open
Normally-Closed (NC) Switch, 177-453-02 Normally-Open (NO) Switch, 177-453-03
W0624
Oil Level Monitor Float Switch Conditions and Wiring Diagram
Electrical Specifications
The following are the float switch electrical specifications:
1. For 177-453-02 Normally Open (NO)
float switch:
two single-pole, double-throw (SPDT) reed switches
rated at 150 VDC/VAC, 1 Amp, 20 Watts (maximum).
or
For 177-453-03 Normally Closed (NC)
float switch:
two single-pole, single-throw (SPST) reed switches
rated at 300 VDC/VAC, 0.5 Amp AC/0.7 Amp DC, 50
Watts (maximum).
2. Sum total of current for both switches not to exceed:
1 Amp
3. Resistive load only
4.
Magnetic float actuation
5. Electrical conduit connection at top of switch adapter:
1/2-14 NPT
6.
UL File No. E203716 with Area Classification UL 508.
7. Not rated for NEC/CEC hazardous locations. Consult fac-
tory for explosive environments.
There is a port with plug (49) on the lower left side of the back
cover. This port may be used for an additional measurement
device.
Additional Measurement Port
