46-620 B73 & Series 75 Liquid Level Switches
24
ELECTRIC SWITCH MECHANISM AND ENCLOSURE
Switch Description
Process
Temperature
Range
° F (° C)
Contacts
Set
Points
Construction Code 1
(except Model S75)
Construction Codes 2, 3 & 4
and Model S75
NEMA 4X/7/9 Aluminum Enclosure
Class I, Div 1
Groups
C & D
Class I, Div 1
Groups
B, C & D
ATEX
Class I, Div 1
Groups
C & D
Class I, Div 1
Groups
B, C & D
ATEX
Series A Mercury
-20 to +550
(-29 to +288)
SPDT
1
2
3
AKA
ALA
n/a
AKJ
ALJ
n/a
ACC
ADC
n/a
AKB
ALB
AMB
AKK
ALK
AMK
AC9
AD9
AE9
DPDT
1
2
ANA
AOA
ANJ
AOJ
AFC
AGC
ANB
AOB
ANK
AOK
AF9
AG9
Series B Snap
-40 to +250
(-40 to +121)
SPDT
1
2
3
BKA
BLA
BMA
BKJ
BLJ
BMJ
BCC
BDC
BEC
BKB
BLB
BMB
BKK
BLK
BMK
BC9
BD9
BE9
DPDT
1
2
BNA
BOA
BNJ
BOJ
BFC
BGC
BNB
BOB
BNK
BOK
BF9
BG9
Series C Snap
-40 to +450
(-40 to +232)
SPDT
1
2
3
CKA
CLA
CMA
CKJ
CLJ
CMJ
CCC
CDC
CEC
CKB
CLB
CMB
CKK
CLK
CMK
CC9
CD9
CE9
DPDT
1
2
CNA
COA
CNJ
COJ
CFC
CGC
CNB
COB
CNK
COK
CF9
CG9
Series D Snap
-40 to +250
(-40 to +121)
SPDT
1
2
3
DKB
DLB
n/a
DKK
DLK
n/a
DC9
DD9
n/a
DKB
DLB
DMB
DKK
DLK
DMK
DC9
DD9
DE9
DPDT
1
2
DNB
DOB
DNK
DOK
DF9
DG9
DNB
DOB
DNK
DOK
DF9
DG9
Series E
Vibration Resistant
Mercury
-20 to +550
(-29 to +288)
SPDT
1
2
3
EKA
ELA
n/a
EKJ
ELJ
n/a
ECC
EDC
n/a
EKB
ELB
EMB
EKK
ELK
EMK
EC9
ED9
EE9
DPDT
1
2
ENA
EOA
ENJ
EOJ
EFC
EGC
ENB
EOB
ENK
EOK
EF9
EG9
Series F
Hermetically Sealed
Snap
-50 to +750
(-46 to +399)
SPDT
1
2
FKA
FLA
FKJ
FLJ
FCC
FDC
FKB
FLB
FKK
FLK
FC9
FD9
DPDT
1
2
FNA
FOA
FNJ
FOJ
FFC
FGC
FNB
FOB
FNK
FOK
FF9
FG9
Series HS
Hermetically Sealed
5 amp Snap
with wiring leads
-50 to +550
(-46 to +288)
SPDT
1
2
HMJ
HMN
HMK
HMP
n/a
HMJ
HMN
HMK
HMP
n/a
DPDT
1
2
HMS
HMY
HMT
HMZ
HMS
HMY
HMT
HMZ
Series HS
Hermetically Sealed
5 amp Snap
with terminal block
-50 to +550
(-46 to +288)
SPDT
1
HM3
HM4
HA9
HM3
HM4
HA9
DPDT
1
HM7
HM8
HB9
HM7
HM8
HB9
Series H1
Hermetically Sealed
1 amp Snap
with wiring leads
-50 to +750
(-46 to +399)
SPDT
1
HKJ
HKK
n/a
HKJ
HKK
n/a
SPDT
2
HKN
HKP
HKN
HKP
Series R
High Temperature Snap
-40 to +1000
(-40 to +538)
SPDT
1
2
RKM
RLM
RKW
RLW
RU5
RV5
RKM
RLM
RKW
RLW
RU5
RV5
Series 3 Mercury
-20 to +750
(-29 to +399)
SPDT
1
2
3
3KA
3LE
3ME
3KJ
3LG
3MG
3CC
3DE
3EE
3KB
3LB
3MB
3KK
3LK
3MK
3C9
3D9
3E9
DPDT
1
2
3NA
3OA
3NJ
3OJ
3FC
3GC
3NB
3OB
3NK
3OK
3F9
3G9
Series 2 Vibration
Resistant Mercury
-20 to +750
(-29 to +399)
SPDT
1
2
3
2KA
2LE
2ME
2KJ
2LG
2MG
2CC
2DE
2EE
2KB
2LB
2MB
2KK
2LK
2MK
2C9
2D9
2E9
DPDT
1
2
2NA
2OA
2NJ
2OJ
2FC
2GC
2NB
2OB
2NK
2OK
2F9
2G9
12
14
Minimum specific gravity ratings apply only to
single stage units. Consult factory for two or
three stage units.
Models are limited to maximum temperature
rating of selected switch mechanism. See
Switch Mechanism Charts above.
Use caution when specifying carbon steel and stainless steel for tempera-
tures greater than +800° F (+427° C), as they become sensitized.
S75, V75 & Z75 contain 17–7 ph floats.
The O75 and P75 are not available with 1
1
⁄
2
" and 2" process connections.
Valid for Models V75 & Z75 only.
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 enclo-
sures. Consult factory for standard part number.
On steam applications, use Series 3 mercury switches with beaded leads.
On steam applications, use Series 2 vibration resistant mercury switches
with beaded leads.
HS and H1 switches can be used with materials of construction code 1
only on models S75, V75 & Z75.
On steam and other condensing applications, temperature down-rated to
+400° F (+204° C) process at +100° F (+38° C) ambient.
R series switches supplied in cast iron switch enclosures.
11
12
13
14
11
13
12
13
12
