Danfoss CAS 178, CAS 180, CAS 181, CAS, CAS 133 Data sheet

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	•	A high level of enclosure	•	Resistance to shock and vibration
	•	Fixed differential	•	Available with all major marine approvals
	• Robust and compact construction

Approvals	CE-marked in accordance with LVD 2006/95/EC	EN 60947-1, EN-60947-4-1, EN 60947-5-1
Ship approvals	American Bureau of Shipping,	Det Norske Veritas, DNV
	ABS (excl. CAS 139)	Registro Italiano Navale, RINA
	Lloyds Register of Shipping, LR (excl. CAS 1080)	Maritime Register of Shipping, RMRS
	Germanischer Lloyd, GL	Nippon Kaiji Kyokai, NKK
	Bureau Veritas, BV

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Data sheet | Pressure switch and Thermostat, type CAS

Overview

Standard pressure switches

[bar]

Range Pe

Type

0

10

20

30

40

50

60

[bar]

0 – 3.5

CAS 133

0 – 10

CAS 136

6 – 18

CAS 137

10 – 35

CAS 139

Pressure switches for high pressure and strongly pulsating media

																[bar]																	Range Pe
																																		Type
0				10			20					30							40			50					60						[bar]
																																	1 – 10	CAS 143
																																	4 – 40	CAS 145
																																	6 – 60	CAS 147

Differential pressure switches

																[bar]																	Range Pe
																																		Type
0		10					20					30							40			50					60						[bar]
																																	0.2 – 2.5	CAS 155

Thermostats

															[°C]																	Range
																																	Type
0	20				40				60					80				100			120				140					160		[°C]
																																20 – 80	CAS 178
																																70 – 120	CAS 180
																																60 – 150	CAS 181

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© Danfoss | DCS (jmn) | 2020.06

Data sheet | Pressure switch and Thermostat, type CAS

PRESSURE SWITCH

Technical data

	Switch	Microswitch with single pole changeover (SPDT)
	Contact load	Alternating current	AC-14 / AC-15: 0.1 A, 220 V
		Direct current	DC-13: 12 W, 125 V
	Ambient temperature	CAS 133 – 139	-40 – 70 °C
		CAS 143 – 155	-25 – 70 °C
	Temperature	CAS 133 – 139	-40 – 100 °C
	of medium1)	CAS 143 – 155	-25 – 100 °C
	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

Type	Materials
CAS 133, CAS 136,	Bellows:	Stainless steel, material no. 1.4306 (DIN 17440)
CAS 137, CAS 139	Pressure connection:	Brass material no. 2.0401 (DIN 17660)
CAS 143, CAS 145,	Diaphragm connection:	Nickel plated brass CuZn 40 Ob3 ISO R 426 (DIN 17569)
CAS 147, CAS 155	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
	Type	Setting		Mechanical	Permissible	Max test	Min. burst	Pressure	Code no.
		range pe		differential	operating	pressure	pressure	connection
					pressure
		[bar]		[bar]	[bar]	[bar]	[bar]
	CAS 133	0 – 3.5		0.1	10	10	40	G ¼	060-315066
	CAS 136	0 – 10		0.2	22	22	40	G ¼	060-315166
	CAS 137	6 – 18		0.3	27	27	72	G ¼	060-315266
	CAS 139	10 – 35		0.6	53	53	100	G ¼	060-315366

Pressure switches for high pressure and strongly pulsating media

Type	Setting	Mechanical		Permissible	Max test	Min. burst	Pressure	Code no.
	range pe	differential		operating	pressure	pressure	connection
				pressure
	[bar]	[bar]		[bar]	[bar]	[bar]
CAS 143	1 – 10	0.2	– 0.6	120	180	240	G ¼	060-316066
CAS 145	4 – 40	0.8	– 2.4	120	180	240	G ¼	060-316166
CAS 147	6 – 60	1	– 3	120	180	240	G ¼	060-316266

Differential pressure switch

Type	Setting	Mechanical	Permissible	Max test	Min. burst	Pressure	Code no.
	range pe	differential	operating	pressure	pressure	connection
			pressure for
	[bar]	[bar]	low pressure	[bar]	[bar]
			[bar]
CAS 155	0.2 – 2.5	0.1	0 – 8	22	42	2 × G ¼	060-313066

Preferred version

Terminology	Range setting
	The pressure range within which the unit will
	give a signal (contact changeover).
	Differential
	The difference between make pressure and
	break pressure (see also page 6).
	Permissible burst pressure
	The highest permanent or recurring pressure the
	unit can be loaded with.

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 as a recurring system pressure.

Min. burst pressure

The pressure which the pressure-sensitive element will withstand without leaking.

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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	position when the differential pressure again falls
Contacts 1-4 make and contacts 1-2 break when	to the range value minus the differential
the differential pressure rises above the set range	(see fig. 1).
value. The contacts changeover to their initial

[bar]
	[s]
	Scale setting
Fig. 6	Mechanical differential

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	when the pressure again rises to the set range
Contacts 1-2 make and contacts 1-4 break when	value plus the differential (see fig. 2).
the pressure falls under the set range value. The
contacts changeover to their initial position

[bar]
	[s]
	Scale setting
Fig. 6	Mechanical differential

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.

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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