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
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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.
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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).
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AI226486438268en-001001| 5
Danfoss
17.9051
Danfoss
60.9030
Data sheet | Pressure switch and Thermostat, type CAS
Accessories
Part Description Qty. Code no.
3
/
connector,
8
5 017-43 686 6
Connector with
nipple
Pipe thread ISO 228-1, G
nipple and AL washer (10 mm ext. 8 mm int. diam)
for solering onto steel or copper tubing,
steel span of jaws 22
3
G
/
connector, nipple and washer
Connector with
nipple
Reducer
Adaptor
Adaptor
Adaptor
Adaptor
8
(10 mm ext./ 6.5 mm int. diam.) for welding,
steel span of jaws 22
3
Pipe thread ISO 228-1, G
/
8
×
7
/
- 20 UNF
16
reducer, washer, brass span of jaws 22
3
Pipe thread ISO 228-1, G
/
×
8
1
/
- 27 NPT
8
with copper washer brass span of jaws 22
Pipe thread ISO 228-1, G
3
/
A × ¼ - 18 NPT
8
with copper washer brass span of jaws 22
Pipe thread ISO 228-1, G
3
/
A × ¼ - 18 NPT
8
with copper washer brass span of jaws 22
7
/
- 20UNF × R
16
3
/
(ISO 7-1) brass, span of jaws 19 1 060-324066
8
1 017- 42296 6
5 017- 42056 6
1 060-333466
1 060-333566
1 060 -333666
Nipple
Damping coil
Armoured
damping coil
G ¼ A × G
3
/
A 060-333266
8
G ¼ A × ext. M10 x 1 with washer 060-333866
Pipe thread ISO 228-1, damping coil with G
connector and 1.5 m copper capillary tube.
3
/
8
1 060-104766
Standard washers are supplied.
Pipe thread ISO 228-1, damping coil with G
connector and 1 m copper capillary tube.
3
/
8
1 060-333366
Standard washers are supplied.
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Data sheet | Pressure switch and Thermostat, type CAS
Installation
Fig. 4
1. Range spindle
2. Range scale
3. Locking screw
Fig. 3
Installation
CAS pressure switches are fitted with a 3 mm
steel mounting plate. The units should not be
allowed to hang from the pressure connection.
Pressure connection
When fitting or removing pressure lines, the
spanner flats on the pressure connection should
be used to apply counter-torque.
Steam plant
To protect the pressure element from excessive
heat, the insertion of a water-filled loop is
recommended. The loop can, for example, be
made of 10 mm copper tube as shown in fig. 3.
Water systems
Water in the pressure element is not harmful,
but in case of frost a water-filled pressure
element may burst. To prevent this happening,
the pressure control can be allowed to operate
on an air cushion.
Media resistance
See table of materials in contact with the
medium, page 3. If seawater is involved, types
CAS 143, CAS 145, CAS 147, CAS 155 are
recommended.
Danfoss
60L641.13
Fig. 5
Pulsations
If the pressure medium is superimposed
with severe pulsations, which occur in automatic
sprinkler systems (fire protection), fuel systems
for diesel motors (priming lines), and hydraulic
systems (e.g. propeller systems), etc, types
case CAS 143, CAS 145, CAS 147 are
recommended.
The maximum permissible pulsation level
for these types is 120 bar.
Setting
When the pressure switche cover is removed,
and the locking screw (3) is lossened, the range
can be set with the spindle (1) while at the same
time the scale (2) is being read (fig. 4).
Electrical connection
CAS pressure switches are fitted with a PG 13.5
screwed cable entry that is suitable for cable
diameters from 5 – 13 mm.
Contact function is shown in fig. 5.
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CAS 133, CAS 136, CAS 143, CAS 145
60-648.10
30
50
Data sheet | Pressure switch and Thermostat, type CAS
Dimensions [mm]
and weights [kg]
Fig. 6 Fig. 7
CAS 137, CAS 139 CAS 147
Fig. 8
Fig. 9
19
CAS 155
G 1/4
40
22
Danfoss
Net weight:
CAS 133-139 approx. 1.0 kg
CAS 143-147 approx. 1.3 kg
CAS 155 approx. 1.5 kg
© Danfoss | DCS (jmn) | 2020.068 | AI226486438268en-001001
Data sheet | Pressure switch and Thermostat, type CAS
THERMOSTAT
Technical data
Typ e CAS 178, CAS 180, CAS 181 CAS 1080
Ordering
Switch
Contact load
Ambient temperature -25 – 70 °C
Vibration resistance
Cable entry
Alternating current AC-14 / AC-15: 0.1 A, 220 V
Direct current DC-13: 12 W, 125 V
Microswitch with single pole
changeover (SPDT)
Vibration-stable in the range 2 – 30 Hz, amplitude 1.1 mm
and 30 – 100 Hz, 4 g.
Pg 13.5 for cable diameters
from 5 – 14 mm
Microswitch with single pole
changeover (2 x SPDT)
2 x g 13.5 for cable diameters
from 5 – 14 mm
Thermostat, type CAS 178 – CAS 181
Typ e Setting
range
[°C]
CA S 178 20 – 80 2.0 130 65 75 110 160 2 06 0L315166
CAS 180 70 – 120 2.0 220 65 75 110 160 2 060L315366
CAS 181 60 – 150 2.0 250 65 75 110 160 2 060L315566
Mechanical
differential
adjustable / fixed
[°C]
Max. sensor
temperature
[°C]
Suitable
sensor length
(see also
“Accessories”)
[mm]
Capillary
tube
length
[m]
Code no.
2-step thermostat, type CAS 1080
Typ e
Factory setting
Step 1 [°C] Step 2 [°C]
CAS 1080 80 80 2.0 220 200 060L502066
Mechanical
differential
[°C]
Max.
temperature
[°C]
Insert sensor
length
[mm]
Code no.
Enclosure
IP67 acc. to EN 60529.
The thermostat 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.
Preferred version
Identification
The type designation and code no. of the unit is
stamped in the side of the housing.
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Data sheet | Pressure switch and Thermostat, type CAS
Accessories
Sensor pockets for thermostats
Brass sensor pocket Steel 18/8 sensor pocket
A
[mm]
65 ½ NPT 060L326566 — — —
75 ½ NPT 060L326466 75 G ½ A 060L326766
75 G ½ A 060L326266 — — —
75 G ¾ A 060L326666 — — —
75 G ½ A (ISO 228/1) 060L328166 — — —
110 ½ NPT 060L328066 110 G ½ A 060L326866
110 G ½ A 060L327166 110 ½ NPT 060L327066
110 G ½ A (ISO 228/1) 060L340666 — — —
110 G ¾ A (ISO 228/1) 060L340366 — — —
160 G ½ A 060L326366 160 G ½ A 060L326966
200 G ½ A 060L320666 — — —
200 G ½ A (ISO 228/1) 060L340866 — — —
200 G ¾ A (ISO 228/1) 060L340266 — — —
Thread
B
Code no.
A
[mm]
Thread
B
Code no.
250 G ½ A 060L325466 — — —
330 G ½ A 060L325566 — — —
Note:
All sensor pockets are supplied without gland nut, gaskets and washes.
Other Accessories Description Qty./unit Code no.
Clamping band
Heat conductive
compound
(Tube with 4.5 cm3)
For CAS temperature controls with remote
sensor (L = 392 mm).
For CAS with sensor fitted in a sensor pocket.
For filling sensor pocket to improve heat
transfer between pocket and sensor.
Application range for compound:
-20 – 150 °C, momentarily up to 220 °C.
10 017- 420 466
1 0 41E0114
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Data sheet | Pressure switch and Thermostat, type CAS
Installation Location of unit: CAS thermostats are designed
to withstand the shocks that occur, for example,
in ships on compressors and in large machine
installations. CAS thermostats are fitted with a
base of 3 mm steel plate for fixing to bulkheads,
etc.
Resistance to media
Material specifications for sensor pockets.
Sensor pocket brass
The tube is made of Ms 72 to DIN 17660, the
threaded portion of So Ms 58 Pb to DIN 17661.
Sensor pocket, stainless steel 18/8
Material designation 1.4305 to DIN 17440.
Permissible media pressure on the sensor pocket as a function of temperature
[bar]
Brass
Sensor position
As far as possible the sensor should be
positioned so that its longitudinal axis is at right
angles to the direction flow. The active part of
the sensor is ø13 mm × 47.5 mm.
The medium
The fastest reaction is obtained from a medium
having high specific heat and high thermal
conductivity. It is therefore advantageous to use
a medium that fulfils these conditions (provided
there is a choice). The flow velocity of the
medium is also of significance. (The optimum
flow velocity for liquids is about 0.3 m/s).
For permissible media pressure see fig. 10.
Stainless steel
1. Range spindle
2. Range scale
3. Locking screw
[°C]
Fig. 10
Setting
When the thermostat cover is removed, and the
locking screw (3) fig. 2 is loosened, the range can
be set with the spindle (1) while at the same time
the scale (2) is being read (fig.11).
Fig. 11
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Factor for setting point
Data sheet | Pressure switch and Thermostat, type CAS
Installation
(continued)
Scale correction
The sensor on CAS thermostats contains an
adsorption charge. Therefore function is not
affected whether the sensor is placed warmer or
colder than the remaining part of the
thermostatic element (bellows and capillary
tube).
However, such a charge is to some extent
sensitive to changes in the temperature of
bellows and capillary tube. Under normal
conditions this is of no importance, but if the
thermostat is to be used in extreme ambient
temperatures there will be a scale deviation.
deviation
The deviation can be compensated for as
follows:
Scale correction = Z × a
Z can be found from fig. 12, while “a” is the
correction factor from the table below.
(See example, page 14).
Danfoss
60-413.12
Relative
scale
setting
in [%]
Fi g. 13
Typ e Regulation range
[°C]
CA S 178 20 – 80 2.5
CAS 180 70 – 120 2.4
CAS 181 60 – 150 3.7
Correction factor a
for thermostats
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Danfoss
60L1049.11
Data sheet | Pressure switch and Thermostat, type CAS
Installation
(continued)
Electrical connection
CAS thermostats are fitted with a Pg 13.5
screwed cable entry suitable for cables
from 5 – 14 mm.
Fig. 14
2-step CAS thermostat, type CAS 1080
© Danfoss | DCS (jmn) | 2020.06
Fig. 15
AI226486438268en-001001| 13
Data sheet | Pressure switch and Thermostat, type CAS
Function
Differentials
The mechanical differential is the differential
determined by the design of the thermostat. The
thermal differential (operating differential) is the
differential the system operates on.
The thermal differential is always greater than
the mechanical differential and depends on
three factors:
1) Medium flow velocity
2) Temperature change rate of the medium
3) Heat transmission to the sensor
[bar]
Thermostat function
Contacts 1-4 make while contacts 1-2 break
when the temperature rises above the scale
setting.
The contacts changeover to their initial position
when the temperature falls to the scale setting
minus the differential. See fig. 16.
I. Alarm for rising temperature given
at range setting value.
II. Alarm for falling temperature given
at range setting value minus the differential.
Fig. 16
Example 1
Diesel engine with cooling water temperature of
85 °C (normal). An alarm must be triggered if the
cooling water temperature exceeds 95 °C.
Choose a CAS thermostat 180 (range 70 – 120 °C).
Main spindle setting: 95 °C.
The required alarm function is obtained by
connecting to thermostat terminals 1-4.
Example 2
Find the necessary scale correction for a CAS 180.
Set 95 °C at 50 °C ambient temperature.
[s]
Scale setting
Mechanical differential
The relative scale setting Z can be calculated
from the following formula:
Setting value - min. scale value
max. scale value - min. scale value
Relative scale setting: 95-70 × 100
120 -70
× 100 = [%]
= 50%
Factor for scale deviation Z fig. 12, Z ≈ 0.7
Correction factor “a=2.4”, see table page 12.
Scale correction = Z × a = 0.7 × 2.4 = 1.7 °C
CAS must be set at 95 + 1.7 = 96.7 °C
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Data sheet | Pressure switch and Thermostat, type CAS
Time [s]
80 °C
Diff. 3 °C
A1
A4
A2
A1
A4
A2
B1
B4
B2
B1
B4
B2
A1
A4
A2
B1
B4
B2
Danfoss
60-1415.11
II III
Function
(continued)
CAS 1080 thermostats have fixed factory
settings.
The thermostats with factory setting
at 80 °C of step 1 and step 2 is used for special
application, where double warning – like cranck
case fire – is requested.
The contacts automatically reset when the
temperature decreases in accordance with the
differential.
Differentials
The mechanical differential is the differential
determined by the design of the thermostat.
The thermal differential (operating differential) is
the differential the contact system operates on.
The thermal differential is always greater than
the mechanical differential and depends on
three factors:
1) Medium flow velocity
2) Temperature change rate of the medium and
3) Heat transmission to the sensor
[°C]
Thermostat function
Contacts 1–4 make while contacts 1–2 break
when the temperature rises above the scale
setting.
The contacts changeover to their initial position
when the temperature falls to the scale setting
minus the differential. See fig. 17.
The contacts marked A correspond to step 1.
The contacts marked B correspond to step 2.
I. Alarm for rising temperature given
at range setting value.
II. Alarm for falling temperature given
at range setting value minus the differential
© Danfoss | DCS (jmn) | 2020.06
[s]
Fi g. 17
Mechanical differential
AI226486438268en-001001| 15
Dimensions [mm]
and weights [kg]
CAS with remote sensor and 2 m armoured capillary tube
Fig. 18
2-step thermostat, type CAS 1080
Fig. 19
Net weight: approx. 1.4 kg
A: 200 or 80 mm
B: G ¾ A
Net weight: approx. 1.4 kg
© Danfoss | DCS (jmn) | 2020.06 AI226486438268en-001001 | 16
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