C24, C25, Boiler
and Water Column
Liquid Level Switches
DESCRIPTION
C24, C25, Boiler and Water Column Liquid Level
Switches are single or multi-switch units that offer versa-
tility and reliable operation in a variety of applications.
Available with up to three switch mechanisms for level
alarm, control, and shutdown functions, the boiler and
water column controls are designed for use in steam
boiler applications while the Models C24 & C25 are for
general industrial use.
FEATURES
•
Easy inspection of float chamber through
removable head
•
Cast iron or fabricated steel float chambers
•
316 and 316L stainless steel floats
•
Brass chamber liner standard in B24, B25, W24, and
W25 models
•
Right or left hand water column mounting
•
Try cock tappings and sight glass tappings available
•
Process temperature to +1000° F (+538° C)
•
Multiple switch capability
•
Working steam pressure to 600 pounds
•
Choice of switch mechanisms:
Pneumatic
Hermetically sealed
Dry contact
•
Choice of switch mechanism enclosures:
NEMA 1 carbon steel for pneumatic
TYPE 4X/7/9 Class I, Div. 1, Groups C & D,
polymer coated aluminum
TYPE 4X/7/9 Class I, Div. 1, Group B,
polymer coated aluminum
•
Optional high temperature insulation available.
See bulletin 41-106.
APPLICATIONS
•
Condensate receiver control
•
Flash tank high level alarm
•
Water tube boiler low water cutoff
•
Boiler steam chest high level alarm
•
Boiler feedwater pump control
•
Day tanks
•
Boiler low water cutoff
•
Holding tanks
TECHNOLOGY
A permanent magnet
is attached to a pivoted
switch actuator and adjustment screw
. As the
float
rises following the liquid level, it raises the
attraction sleeve
into the field of the magnet,
which then snaps against the non-magnetic
enclosing tube
, actuating the switch
. The
enclosing tube provides a static pressure boundary
between the switch mechanism and the process.
On a falling level, an inconel spring retracts the
magnet, deactivating the switch.
2
5
6
4
1
3
Pivot
Return
Spring
Process Liquid
Process Liquid
Rising Level
Falling Level
MOUNTING
WATER
COLUMN
LEVEL
SWITCHES
The right- and left-hand mounting arrangement refers to
the position of the try cock tappings in relation to the
gauge glass connections.
To determine whether the control mounting is right- or
left-hand, position the control with the gauge glass con-
nections facing you. If the try cock tappings are to the
right, it is a right-hand control, if they are to the left, it is
a left-hand control. Refer to illustrations below.
Model W24—Right-hand
mounting
Model W25—Right-hand
mounting
Model W29—Left-hand
mounting
Model W60—Left-hand
mounting
Left hand control
Right hand control
2
SPECIFICATIONS
SWITCH
MECHANISMS
AND
ENCLOSURES
SERIES B, C & D DRY CONTACT SWITCHES
•
Dry contact for applications where
mercury must be avoided
•
Designs for AC and DC
current applications
•
Process temperatures
to +450° F (+232° C)
SERIES F, HS, H1, 8 & 9 HERMETICALLY SEALED SWITCHES
•
Ideal for use in salt and other
corrosive atmospheres
•
Positively pressurized capsules for
entire mechanism and contacts
•
Process temperatures
to +1000° F (+538° C)
SERIES J & K PNEUMATIC SWITCHES
•
Suited for applications where
electrical power is not available
•
Bleed and non-bleed designs
•
Process temperatures
to +400° F (+204° C)
SWITCH ENCLOSURES
•
TYPE 4X/7/9 aluminum enclosures
•
Designed to meet Class I, Div. 1,
Groups C & D and Class I, Div. 1
Group B
•
Optional housing heaters and drains
available for some enclosures
•
Pneumatic switch mechanisms
available with a NEMA 1 enclosure
BASIC ELECTRICAL RATINGS
Voltage
120 VAC
240 VAC
24 VDC
120 VDC
240 VDC
Switch Series and Non-Inductive Ampere Rating
B
C
D
F
HS
H1
15.00
15.00
6.00
0.50
0.25
15.00
15.00
10.00
1.00
0.50
10.00
—
10.00
10.00
3.00
2.50
—
4.00
0.30
—
5.00
5.00
5.00
0.50
0.25
1.00
1.00
1.00
0.40
—
R
1.00
1.00
1.00
0.40
—
8
1.00
—
3.00
—
—
9
—
—
0.50
—
—
3
AGENCY
AGENCY
APPROVALS
APPROVED MODEL
APPROVAL CLASSES
FM
All with an electric switch mechanism and a housing
listed as TYPE 4X/7/9
All with an electric switch mechanism and a housing
listed as TYPE 4X/7/9 Class
I,
Div 1, Group B
Class
I,
Div 1, Groups C & D
Class
II,
Div 1, Groups E, F & G
Class
I,
Div 1, Groups B, C & D
Class
II,
Div 1, Groups E, F & G
Class
I,
Div 2, Groups B, C & D
Class
I,
Div 1, Groups C & D
Class
II,
Div 1, Groups E, F & G
Class
I,
Div 1, Groups B, C & D
Class
II,
Div 1, Groups E, F & G
ATEX
II
2 G EEx d
IIC
T6
94/9/EC
IEC Ex Ex d
IIC
T6
IP 66
Installation Category
II
Pollution Degree 2
CSA
All with a Series HS, H1, F, 8 or 9 electric switch
mechanism and a housing listed as CSA TYPE 4X
All with an electric switch mechanism and a housing
listed as TYPE 4X/7/9
All with an electric switch mechanism and a housing
listed as TYPE 4X/7/9 Class
I,
Div 1, Group B
All with an electric switch mechanism and an
ATEX housing
ATEX / IEC Ex
CE
Low Voltage Directives 2006/95/EC
Per Harmonized Standard:
EN 61010-1/1993 & Amendment No. 1
Dual stage units with “HS” or “H1” switches are not ATEX approved.
IEC Installation Instructions:
The cable entry and closing devices shall be Ex d certified suitable for the conditions of use
and correctly installed.
For ambient temperatures above +55° C or for process temperatures above +150° C, suitable
heat resistant cables shall be used.
Heat extensions (between process connection and housing) shall never be insulated.
Special conditions for safe use:
When the equipment is installed in process temperatures higher than +85° C the temperature
classification must be reduced according to the following table as per IEC60079-0.
Maximum Process
Temperature
< 85° C
< 100° C
< 135° C
< 200° C
< 300° C
< 450° C
Temperature
Classification
T6
T5
T4
T3
T2
T1
These units are in conformity with IECEx KEM 05.0020X
Classification Ex d
IIC
T6
Tambient -40° C to +70° C
4
DIMENSIONAL
INCHES
N
SPECIFICATIONS
N
P
N
P
Q
M
M
plugged
M
Q
(mm)
P
Q
M
M
plugged
R
Gauge
glass L
tappings
Drum
connections
K
R
M
plugged
K
HL
A
HL
LL
A
Low water
cutoff point
K
R
HL
K
G
I
C
S
B
J
I
T
Try cock
tappings
A
LL
LL
K
C
Models B24, C24
Models B25, C25
Allow 10.00 (254) overhead clearance
for cover removal.
L
E
K
B
ACTUATION LEVELS *
Model
B24/C24
B25/C25
W24
W25
W29
W60
Min. S.G.
HL
LL
0.69
(18)
3.69
(94)
11.38
(289)
9.44
(240)
11.00
(279)
10.50
(267)
1.56
(40)
4.50
(114)
12.25
(311)
10.25
(260)
11.88
(302)
11.06
(281)
1.0
HL
0.94
(24)
4.13
(105)
11.88
(302)
9.88
(251)
11.50
(292)
11.19
(284)
LL
1.69
(42)
4.88
(124)
12.63
(321)
10.63
(270)
12.25
(311)
11.69
(297)
D
C
S
Conduit Connections M
Electrical Switches:
TYPE 4X/7/9: 1" NPT
Group B:
1" NPT
Pneumatic Switches:
1
NEMA 1:
⁄
4
" NPT
All housings rotatable 360°
Models W24, W25, W29, W60
DIMENSIONS
Model
B24/C24
B25/C25
W24
W25
W29
W60
A
5.56
(141)
7.00
(177)
16.00
(405)
13.50
(343)
15.00
(381)
15.00
(381)
B
n/a
2.00
(51)
3.00
(76)
2.00
(51)
4.50
(114)
4.19
(106)
C
2.81
(71)
2.63
(66)
2.63
(66)
2.63
(66)
2.83
(71)
3.61
(91)
D
n/a
n/a
3.06
(77)
3.06
(77)
2.88
(73)
3.66
(92)
E
n/a
n/a
3.50
(88)
2.00
(51)
4.50
(114)
4.19
(106)
G
n/a
n/a
15.00
(381)
13.50
(343)
15.00
(381)
15.00
(381)
I
n/a
n/a
3.50
(88)
3.00
(76)
3.50
(88)
3.50
(88)
J
n/a
n/a
4.00
(101)
3.00
(76)
4.00
(101)
4.00
(101)
K
1"
NPT
1"
NPT
1
1
⁄
4
"
NPT
1"
NPT
1
1
⁄
4
"
NPT
1
1
⁄
4
"
NPT
L
n/a
n/a
⁄
4
"
NPT
1
⁄
2
"
NPT
3
⁄
4
"
NPT
3
* Single switch mechanism only. Consult factory
for multiple switches.
Levels are ±0.25" (6 mm)
N
5.93
(150)
5.93
(150)
5.93
(150)
5.93
(150)
5.93
(150)
5.93
(150)
P
3.78
(96)
3.78
(96)
3.78
(96)
3.78
(96)
3.78
(96)
3.78
(96)
Q
6.25
(158)
8.46
(214)
8.46
(214)
8.46
(214)
8.46
(214)
8.46
(214)
R
16.25
(412)
22.12
(561)
33.50
(850)
28.62
(726)
33.50
(850)
34.37
(872)
S
n/a
1
1
⁄
4
"
NPT
⁄
4
"
NPT
1
1
⁄
4
"
NPT
3
⁄
4
"
NPT
3
T
n/a
n/a
⁄
4
"
NPT
1
⁄
2
"
NPT
3
⁄
4
"
NPT
3
⁄
4
"
NPT
3
⁄
4
"
NPT
3
⁄
4
"
NPT
3
5
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