Magnetrol C75 - 7 Model Numbers; Model B73

21
46-620 B73 & Series 75 Liquid Level Switches
B20 1" NPT threaded side/bottom
B30 1" socket weld side/bottom
N30 1" 150 lb. flanged upper side/bottom
N40 1" 300 lb. flanged upper side/bottom
S30 1" 150 lb. flanged side/side
S40 1" 300 lb. flanged side/side
Pressure Rating
Model Min.
psig @ ° F bar @ ° C
No. SG Materials of Construction 100 450 38 232
B73-1 0.59 Carbon steel chamber, 316
stainless steel
float,
400 stainless steel trim
B73-2 0.59
Carbon steel chamber, 316 stainless steel float,
316 stainless steel
trim
400 275 28 20
B73-3 0.59 304 stainless steel chamber, 316
stainless steel
float,
304 stainless steel trim
B73-4 0.59 316 stainless steel chamber, 316
stainless steel
float,
316 stainless steel trim
MODEL NUMBER CODE
TANK CONNECTION TYPE AND SIZE

 Models are limited to maximum temperature rating of selected
switch mechanism. See Switch Mechanism chart on page 26.
 Consult factory for NEMA 4X/7/9 cast iron housings.
 Process temperature based on +100° F (+38° C) ambient.
 Drain or uncontrolled housing heater available in NEMA 4X/7/9
enclosures. Consult factory for standard part number.
 On steam & other condensing applications, temperature down-
rated to +400° F (+204° C) process @ +100° F (+38° C) ambient.
7.0 Model Numbers
7.1 Model B73