Danfoss CAS 178, CAS 180, CAS 181, CAS, CAS 133 Data sheet
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Data sheet
Pressure switch and Thermostat
CAS
The CAS Series consists of a series of pressure
controlled switches and temperature controlled
switches. In this series, special attention has been
given to meeting demands for a high level of
enclosure, robust and compact construction and
resistance to shock and vibration.
The series is suitable for use in alarm and
regulation systems in factories, diesel plants,
compressors, power stations and on board ships.
Features
Approvals
Ship approvals
• A high level of enclosure
• Fixed differential
• Robust and compact construction
CE-marked in accordance with LVD 2006/95/EC EN 60947-1, EN-60947-4-1, EN 60947-5-1
American Bureau of Shipping,
ABS (excl. CAS 139)
Lloyds Register of Shipping, LR (excl. CAS 1080)
Germanischer Lloyd, GL
Bureau Veritas, BV
• Resistance to shock and vibration
• Available with all major marine approvals
Det Norske Veritas, DNV
Registro Italiano Navale, RINA
Maritime Register of Shipping, RMRS
Nippon Kaiji Kyokai, NKK
AI226486438268en-001001 | 1© Danfoss | DCS (jmn) | 2020.06
Data sheet | Pressure switch and Thermostat, type CAS
Overview
Standard pressure switches
[bar]
0 10 20 30 40 50 60
Pressure switches for high pressure and strongly pulsating media
[bar]
0 10 20 30 40 50 60
Differential pressure switches
[bar]
0 10 20 30 40 50 60
Range P
e
[bar]
Typ e
0 – 3.5 CA S 133
0 – 10 CAS 136
6 – 18 C AS 137
10 – 35 CA S 139
Range P
e
[bar]
Typ e
1 – 10 CAS 143
4 – 40 C AS 145
6 – 60 CA S 147
Range P
e
[bar]
Typ e
Thermostats
[°C]
0 20 40 60 80 100 120 140 160
0.2 – 2.5 CA S 155
Range
[°C]
Typ e
20 – 80 CAS 178
70 – 120 CAS 180
60 – 150 CAS 181
© Danfoss | DCS (jmn) | 2020.062 | AI226486438268en-001001
Data sheet | Pressure switch and Thermostat, type CAS
PRESSURE SWITCH
Technical data
Switch Microswitch with single pole changeover (SPDT)
Contact load
Ambient temperature
Temperature
of medium1)
Vibration resistance Vibration-stable in the range 2 – 30 Hz amplitude 1.1 mm and 30 – 100 Hz, 4 g.
Cable entry Pg 13.5 for cable diametrers from 5 – 14 mm.
1)
For water and seawater, max. 80 °C
Materials in contact with the medium
Typ e Materials
Alternating current AC-14 / AC-15: 0.1 A, 220 V
Direct current DC-13: 12 W, 125 V
CAS 133 – 139 -40 – 70 °C
CAS 143 – 155 -25 – 70 °C
CAS 133 – 139 -40 – 100 °C
CAS 143 – 155 -25 – 100 °C
CAS 133, CAS 136,
CAS 137, CAS 139
CAS 143, CAS 145,
CAS 147, CAS 155
Bellows: Stainless steel, material no. 1.4306 (DIN 17440)
Pressure connection: Brass material no. 2.0401 (DIN 17660)
Diaphragm connection: Nickel plated brass CuZn 40 Ob3 ISO R 426 (DIN 17569)
Diaphragm: Nitrile-butadien rubber
Enclosure
IP67 acc. to EN 60529.
The pressure control housing is enamelled
pressure die cast aluminium (GD-AISi 12).
The cover is fastened by four screws which
are anchored to prevent loss.
The enclosure can be sealed with fuse wire.
Identification
The type designation and code no. of the unit
is stamped in the side of the housing.
© Danfoss | DCS (jmn) | 2020.06
AI226486438268en-001001| 3
Data sheet | Pressure switch and Thermostat, type CAS
Ordering
Standard pressure switches
Typ e Setting
range p
[bar]
CA S 133 0 – 3.5 0.1 10 10 40 G ¼
CA S 136 0 – 10 0.2 22 22 40 G ¼ 060-315166
CA S 137 6 – 18 0.3 27 27 72 G ¼ 060 -31526 6
CA S 139 10 – 35 0.6 53 53 100 G ¼ 060-315366
Mechanical
differential
e
[bar]
Permissible
operating
pressure
[bar]
Max test
pressure
[bar]
Min. burst
pressure
[bar]
Pressure
connection
Code no.
060-315066
Pressure switches for high pressure and strongly pulsating media
Typ e Setting
range p
[bar]
CA S 143 1 – 10 0.2 – 0.6 12 0 180 240 G ¼ 0 60-316 066
CA S 145 4 – 40 0.8 – 2.4 12 0 180 240 G ¼ 06 0-316166
CA S 147 6 – 60 1 – 3 120 180 240 G ¼ 060-316266
Mechanical
differential
e
[bar]
Permissible
operating
pressure
[bar]
Max test
pressure
[bar]
Min. burst
pressure
[bar]
Pressure
connection
Code no.
Differential pressure switch
Typ e Setting
range p
[bar]
Mechanical
differential
e
[bar]
Permissible
operating
pressure for
low pressure
Max test
pressure
[bar]
Min. burst
pressure
[bar]
Pressure
connection
Code no.
Terminology
[bar]
CA S 155 0.2 – 2.5 0.1 0 – 8 22 42 2 × G ¼ 060-313066
Preferred version
Range setting
The pressure range within which the unit will
give a signal (contact changeover).
Max. test pressure
The highest pressure the unit may be subjected
to when, for example, testing the system for
leakage. Therefore, this presure must not occur
Differential
as a recurring system pressure.
The difference between make pressure and
break pressure (see also page 6).
Min. burst pressure
The pressure which the pressure-sensitive
Permissible burst pressure
element will withstand without leaking.
The highest permanent or recurring pressure the
unit can be loaded with.
© Danfoss | DCS (jmn) | 2020.064 | AI226486438268en-001001
Data sheet | Pressure switch and Thermostat, type CAS
Function
I. Alarm for rising pressure
given at the set range value
II. Alarm for falling pressure
given at the set range value
minus the differential
a. CAS 155
Contacts 1-4 make and contacts 1-2 break when
the differential pressure rises above the set range
value. The contacts changeover to their initial
[bar]
position when the differential pressure again falls
to the range value minus the differential
(see fig. 1).
[s]
Scale setting
Mechanical differentialFig. 6
I. Alarm for rising pressure
given at the set range value
II. Alarm for falling pressure
given at the set range value
minus the differential
b. All other CAS pressure switches
Contacts 1-2 make and contacts 1-4 break when
the pressure falls under the set range value. The
contacts changeover to their initial position
[bar]
Fig. 6
Example 1:
An alarm must be given when the lubrication oil
pressure in a motor falls below 0.8 bar. Select
CAS 133 (range 0 – 3.5 bar).
The minimum permissible lubricating oils
pressure of 0.8 bar must be set using the range
spindle. The differential is fixed at 0.1 bar, i.e. the
alarm will not cut out before the pressure rises to
0.9 bar.
The switch break function is normally used for
alarm purposes, i.e. the alarm must be connected
to terminals 1 and 4.
when the pressure again rises to the set range
value plus the differential (see fig. 2).
[s]
Scale setting
Mechanical differential
Example 2:
When the differential pressure exceeds 1.3 bar
a filter must be cleaned.
The maximum static pressure (LP) for the CAS
155 of 8 bar must not be exceeded.
The pressure control range spindle must be set
at 1.3 bar.
The alarm must be connected to terminals
1 and 2 (alarm for broken circuit).
© Danfoss | DCS (jmn) | 2020.06
AI226486438268en-001001| 5
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