Page 158 - Lewis

Pressure/Temperature Switches 157

NORMALLY OPEN
("Make" Switch)
These models are "OFF" until the pressure reaches a designated rating. Commonly used to start an
hourmeter or to energize (with a relay) the alternator field of a diesel engine.

NORMALLY CLOSED
("Break" Switch)
These models are "ON" until the pressure reaches the designated
rating. Commonly used to activate a low pressure alarm or "Idiot" light.

Temperature Switches

84218 84227 PRESSURE/TEMP . SWITCHES
FIG 3183
COLE HERSEE
Self-grounding for operation of one (Hot) indicator light.
Replaces
No. Each I.P.S. Makes @ S/W
EX24537 $26.80 3/8" 200°F 363E (84251)
84218 28.70 1/2" 200°F 363F
84227 24.75 1/2" 250°F 363G

Pressure Switches Pressure Switch
Dual Circuit

FIG 3221b

Switches to activate an hourmeter, warning light, buzzer or FIG 7405b
engine cut-off when oil or air pressure drops or exceeds safe
levels. Single circuit, 2 terminals, insulated.
No. Each I.P.S. Type Setting With a dual circuit. Three terminals: one Normally Open; one
230-404B $31.30 1/8" N.O. 4 P.S.I. Normally Closed and one Common.
230-504B 31.30 1/8" N.C. 4 P.S.I. No. Each I.P.S. Type Setting
230-515B 31.30 1/8" N.C. 15 P.S.I. 230-604B $35.00 1/8" N.O./N.C. 4 P.S.I.