Actuating flow rate
Pipe
Actuating Flow Rate, GPM Water Flow
Size
Increasing and Decreasing Rate
(NPT)
A
B
C
D
E
F
Not
1.1 inc.
1.6 inc.
2.3 inc.
3.4 inc.
4.9 inc.
3
⁄
4
"
Available 0.8 dec. 1.2 dec. 1.8 dec. 2.6 dec.
3.7 dec.
1.0 inc.
1.7 inc.
2.5 inc.
3.7 inc.
5.5 inc.
7.1 inc.
1"
0.8 dec. 1.4 dec. 2.1 dec. 3.0 dec. 4.5 dec.
5.8 dec.
1.3 inc.
2.7 inc.
4.7 inc.
7.6 inc. 12.3 inc.
21.1 inc.
1
1
⁄
2
"
1.1 dec. 2.3 dec. 4.0 dec. 6.5 dec. 10.5 dec. 17.9 dec.
1.9 inc.
3.1 inc.
5.1 inc.
8.4 inc. 14.3 inc.
24.8 inc.
2"
1.6 dec. 2.7 dec. 4.3 dec. 7.1 dec. 12.1 dec. 21.0 dec.
Specific gravity correction chart
Part number code
Agency
Approval
Models
All models with an electric
Non-Hazardous
switch mechanism and a
NEMA 4X
housing listed as NEMA 4X.
Class
I
, Div. 1,
All models with an electric
Groups C & D
switch mechanism and a
FM
Class
II
, Div. 1,
housing listed as
Groups E, F & G
NEMA 4X/7/9.
Class
I
, Div. 1,
All models with an electric
Groups A, B, C & D
switch mechanism and a
Class
II
, Div. 1,
housing listed as NEMA 4X/7/9
Groups E, F & G
Class
I
, Div. 1, Group B.
All models with a Series B, C or
Non-Hazardous
D electric switch mechanism
CSA TYPE 4X
and a housing listed as CSA
TYPE 4X.
All models with a Series A, E, 2
Class
I
, Div. 2
or 3 electric switch mechanism
Groups A, B, C & D
and a housing listed as CSA
CSA
TYPE 4X.
Class
I
, Div. 1,
All models with an electric
Groups C & D
switch mechanism and a
Class
II
, Div. 1,
housing listed as
Groups E, F & G
NEMA 4X/7/9.
Class
I
, Div. 1,
All models with an electric
Groups B, C & D
switch mechanism and a
Class
II
, Div. 1,
housing listed as NEMA 4X/7/9
Groups E, F & G
Class
I
, Div. 1, Group B.
All models with an electric
Cenelec EEx d
II
C T6
switch mechanism and a
Cenelec housing.
All models with an electric
Baseefa Ex d
II
C T6
switch mechanism and a
Baseefa housing.
All models with Series A, B, C,
D or E electric switch mech-
SAA
Ex d
II
C T6 1P65
anism and a housing listed as
NEMA 4X/7/9 Class
I
, Div. 1,
Group B.
Agency approvals
Model number construction
F50-
2
-
Basic part number, materials of
construction, and pipe line size
Actuating flow rate
Switch mechanism and enclosure
GENERAL INFORMATION
2
Model identification
F50 Flow Switches are identified by an alphanumeric part
numbering system. The first six digits identify the basic
model, materials of construction, and pipe line size; the
next digit identifies the actuating flow rate; and the final
three digits describe switch mechanism and the switch
enclosure.
Unpacking
Unpack the instrument carefully, inspecting all components
for damage. Report any concealed damage to the carrier
within 24 hours. Check the contents of the carton/crate
against those listed on the packing slip, and report any dis-
crepancy to the factory. Check the part number on the
nameplate to be certain it agrees with the part number
shown on the packing slip and purchase order. Record the
serial number for future reference when ordering parts.
Specific gravity correction
To determine the actuating flow rates for liquids, other than
water (approximate viscosity of 20 centistokes or less), a
specific gravity correction factor must be applied to the
water flow rates given in the table.
Example: A 2" NPT size Model F50, with size C flow disc,
actuates with water flow rates of 5.1 GPM increasing flow
and 4.3 GPM decreasing flow. Then, used with a hydrocar-
bon liquid of 0.60 specific gravity (1.33 multiplication factor),
the actuating flow rates are 6.8 GPM increasing and 5.7
GPM decreasing flow.
Part Number Codes
Pipe Size
Bronze
Stainless Steel
3
⁄
4
" NPT
F50-1A2
F50-4A2
1" NPT
F50-1B2
F50-4B2
1
1
⁄
2
" NPT
F50-1C2
F50-4C2
2" NPT
F50-1D2
F50-4D2
Bronze body with Type 300 series stainless steel trim; 400 series
stainless steel magnetic sleeve.
Type 316 stainless steel body and all internal trim.
Specific
Multiplication
Specific
Multiplication
Gravity
Factor
Gravity
Factor
.40
1.65
.95
1.03
.45
1.55
1.00
1.00
.50
1.46
1.05
.97
.55
1.39
1.10
.95
.60
1.33
1.15
.92
.65
1.27
1.20
.90
.70
1.22
1.25
.88
.75
1.17
1.30
.86
.80
1.13
1.35
.84
.85
1.10
1.40
.82
.90
1.06
1.45
.80
