MAKING MODERN LIVING POSSIBLE

Technical brochure

Pressure and temperature controls,

Type KPS

The KPS Series consists of a series of pressure-

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.

For KPS pressure controls the position of

the contacts depends on the pressure in the
inlet connection and the set scale value. For
KPS temperature controls the position of the
contacts depends on the temperature of the
sensor and the set scale value.

The series covers most outdoor as well as

indoor application requirements and is
suitable for use in monitoring alarm and
regulation systems in factories, diesel plants,
compressors, power stations and on board
ships.

Features yy A high level of enclosure yy Resistance to shock and vibration

yy Adjustable differential yy Available with all major marine approvals
yy Robust and compact construction

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Technical brochure Pressure and temperature controls, type KPS

Approvals EN 60 947-4-1 Underwriters Laboratories Inc., US-UL

EN 60 947-5-1 China Compulsory Certificate, CCC

Ship approvals American Bureau of Shipping, ABS Bureau Veritas, BV - Includes thermostats with
Det Norske Veritas, DNV fixed sensor and pressure controls with amoured
Germanischer Lloyd, GL capillary tube
Registro Italiano Navale, RINA Korean Register of Shipping, KR (KPS 35, KPS 37,
Maritime Register of Shipping, RMRS KPS 39, KPS 43, KPS 45, KPS 47)
Nippon Kaiji Kyokai, NKK Lloyds Register of Shipping, LR
China Classification Society, CCS

Survey 1. Standard pressure controls

Range Type Further
Pe information
-1 0 10 20 30 40 50 60 bar bar page
0 - 2.5 KPS 31 3
0 - 3.5 KPS 33 3
0-8 KPS 35 3
6 - 18 KPS 37 3
10 - 35 KPS 39 3

2. Type KPS pressure controls for high pressure and strongly pulsating media
Range Type Further
Pe information
-1 0 10 20 30 40 50 60 bar bar page
1 - 10 KPS 43 3
4 - 40 KPS 45 3
6 - 60 KPS 47 3

3. Type KPS temperature controls

Range Type Further
Pe informa-
bar tion
-50 0 50 100 150 200 200 oC page
-10 - 30 KPS 76 8
20 - 60 KPS 77 8
50 - 100 KPS 79 8
70 - 120 KPS 80 8
60 - 150 KPS 81 8
100 - 200 KPS 83 8

ISO 9001 quality approval Danfoss A/S is certificated by BSI in accordance

with international standard ISO 9001. This means
that Danfoss fulfils the international standard
in respect of product development, design,
production and sale. BSI exercises continuous
inspection to ensure that Danfoss observes the
requirements of the standard and that Danfoss’
own quality assurance system is maintained at
the required level.

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Technical brochure Pressure and temperature controls, type KPS

Installation Installation Setting

KPS pressure switches are fitted with a 3 mm steel When the pressure switch cover is removed, and
mounting plate. The units should not be allowed the locking screw (5) is loosened, the range can
to hang from the pressure connection. be set with the spindle (1) while at the same
time the scale (2) is being read. In units having
Pressure connection an adjustable differential, the spindle (3) must
When fitting or removing pressure lines, the be used to make the adjustment. The differential
spanner flats on the pressure connection should obtained can be read direct on the scale (4) or,
be used to apply counter-torque. with types KPS 43, 45, 47, can be determined
by reading the scale value and using the
Steam plant nomograms in figs. 1, 2, 3 (page 3). The working
To protect the pressure element from excessive line for determining the differential must not
heat, the insertion of a water-filled loop is intersect the shaded areas in the nomograms.
recommended. The loop can, for example, be
made of 10 mm copper tube as shown in fig. 5.

1. Range spindle
2. Range scale
3. Differential spindle
4. Differential scale
Fig. 6 5. Locking screw

Selection of differential
To ensure that the plant functions properly, a
suitable differential pressure is necessary.
Too small a differential will give rise to short
running periods with a risk of hunting. Too high
a differential will result in large pressure
Fig. 5 oscillations.

Electrical connection
Water systems KPS pressure switches are fitted with a
Water in the pressure element is not harmful, but Pg 13.5 screwed cable entry that is suitable for
if frost is likely to occur a water-filled pressure cable diameters from 5 to 14 mm.
element may burst. To prevent this happening, Contact function is shown in fig. 7.
the pressure control can be allowed to operate
on an air cushion.

Media-resistance
See table of materials in contact with the
medium, page 4. If seawater is involved, types
KPS 43, 45, 47 are recommended.

Pulsations
If the pressure medium is superimposed with
severe pulsations, which occur in automatic Fig. 7
sprinkler systems (fire protection), fuel systems
for diesel motors (priming lines), and hydraulic
systems (e.g. propeller systems), etc., types
KPS 43,45,47 are recommended. The maximum
permissible pulsation level for these types is
120 bar.

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Technical brochure Pressure and temperature controls, type KPS

Temperature controls

Technical data and ordering When ordering, please state type and code number
Setting Mech. Max. Suitable sensor length Cap. Code no.
range diff. sensor see also “Accessories” tube
adjust- temp. length
able/
fixed
Type

°C °C °C mm m
-10 - 30 3 - 10 80 65 75 110 160 2 060L311266 060L311366 KPS 76
20 - 60 3 - 14 130 - 75 - - - 060L311866 KPS 77
20 - 60 3 - 14 130 - - 110 - - 060L310066 KPS 77
20 - 60 3 - 14 130 - - - 160 - 060L313666 KPS 77
20 - 60 3 - 14 130 65 75 110 160 2 060L310166 060L310266 KPS 77
20 - 60 3 - 14 130 - - 110 160 5 060L311966 060L312066 KPS 77
KPS with rigid sensor 50 - 100 4 - 16 200 - 75 - - - 060L312166 KPS 79
50 - 100 4 - 16 200 - - 110 - - 060L310366 KPS 79
50 - 100 4 - 16 200 - - - 160 - 060L313766 KPS 79
50 - 100 4 - 16 200 65 75 110 160 2 060L310466 060L310566 KPS 79
50 - 100 4 - 16 200 - - 110 160 5 060L312266 060L312366 KPS 79
50 - 100 4 - 16 200 - - 110 160 8 060L312466 060L312566 KPS 79
50 - 100 4 - 16 200 65 75 110 160 3 060L314366 KPS 79
50 - 100 9 200 - 75 - - - 060L3141661) KPS 79
70 - 120 4.5 - 18 220 - 75 - - - 060L312666 KPS 80
70 - 120 4.5 - 18 220 - - 110 - - 060L312766 KPS 80
70 - 120 4.5 - 18 220 - - - 160 - 060L313866 KPS 80
70 - 120 4.5 - 18 220 - - - 200 - 060L315766 KPS 80
70 - 120 4.5 - 18 220 65 75 110 160 2 060L312866 060L312966 KPS 80
70 - 120 4.5 - 18 220 65 75 110 160 3 060L315666 KPS 80
KPS with remote sensor 70 - 120 4.5 - 18 220 - - 110 160 5 060L313066 060L313166 KPS 80
70 - 120 4.5 - 18 220 - - 110 160 8 060L313266 060L313366 KPS 80
60 - 150 5 - 25 250 65 75 110 160 2 060L310666 060L310766 KPS 81
60 - 150 5 - 25 250 - - 110 160 5 060L313466 060L313566 KPS 81
60 - 150 5 - 25 250 - - 110 160 8 060L311166 KPS 81
60 - 150 5 - 25 250 - - 200 - - 060L311066 KPS 81
100 - 200 6.5 - 30 300 65 75 110 160 2 060L310866 060L310966 KPS 83
100 - 200 18 300 65 75 110 160 2 060L3139661) KPS 83
Thermostat with max. reset
1)

KPS with remote sensor and

armoured capillary tube

Electrical connection KPS thermostats are fitted with a Pg 13.5 screwed

cable entry suitable for cables from 5 to 14 mm.
Contact function is shown in Fig. 5

Fig. 5

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Technical brochure Pressure and temperature controls, type KPS

Technical data Contact load (Alternating current):

(when Au surface is burned away)
Ohmic: 10 A, 440 V, AC-1
Inductive: 6 A, 440 V, AC-3
4 A, 440 V, AC-15
Starting current max. 50 A (locked rotor)
Ambient temperature –40 to +70 °C
Vibration resistance
Vibration-stable in the range 2-30 Hz, amplitude
1.1 mm og 30-300 Hz, 4 G.
Enclosure
IP 67 to IEC 529 and DIN 40050.
The thermostat housing is enamelled pressure
die cast aluminium (GID-AlSI 12). The cover is
fastened by four screws which are anchored to
prevent loss.
The enclosure can be sealed with fuse wire.
Cable entry
Pg 13.5 for cable diameters from 5 to 14 mm.
Identification
The type designation and code no. of the unit is
stamped in the side of the housing.
Fig. 1
Curve A gives the maximum load.
Hatched area B: Acceptable load for the gold Scale accuracy
plating of the contact.
KPS 76: ±3 °C KPS 80: ±3 °C
KPS 77: ±3 °C KPS 81: ±6 °C
Switch KPS 79: ±3 °C KPS 83: ±6 °C
Single-pole changeover switch (SPDT).
Snap point variation after 400 000 operations.
Contact material: Gold-plated silver contact.
KPS 76-83: max. drift 2 °C.
Direct current: 12 W, 220 V, DC-13 – See fig. 1

Function Selection of differential The thermal differential is always greater than

To ensure that the plant functions properly, a the mechanical differential and depends on three
suitable differential is necessary. Too small a dif- factors:
ferential will give rise to short running periods 1) the flow velocity of the medium,
with a risk of hunting. Too high a differential will 2) the temperature change rate of the medium,
result in large temperature variations and
3) the heat transmission to the sensor
Differentials
The mechanical differential is the differential that Thermostat function
is set by the differential spindle in the thermostat. Contacts 1-4 make while contacts 1-2 break when
The thermal differential (operating differential) is the temperature rises above the scale setting. The
the differential the system operates on. contacts changeover to their initial position when
the temperature falls to the scale setting minus
the differential. See fig. 6.

I. Alarm for rising temperature

given at range setting value.
II. Alarm for falling temperature
given at range setting value
minus the differential.
Scale setting

Mechanical
differerential

Fig. 6

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Technical brochure Pressure and temperature controls, type KPS

Dimensions and weight

Sensor pocket Sensor

length “A” length ” L”
75 105
110 138
KPS with remote sensor KPS with remote sensor and armoured 160 190
Weight: ca 1.2 kg capillary tube 200 230
(incl. 2 m capillary tube) Weight : ca 1.4 kg (incl. 2 m capillary tube)
KPS with rigid sensor
Weight: ca 1.0 kg

Accessories: Sensor pockets Sensor A Thread Code no. Sensor A Thread Code no.
for KPS thermostats pocket mm B pocket m B
Brass 65 1/2 NPT 060L326566
Brass 75 1/2 NPT 060L326466 Steel 18/8 75 G 1/2A 060L326766
75 G 1/2 A 060L326266
75 G 3/8 A 060L326666
75 G 1/2 A (ISO 228/1) 060L328166
Brass 110 1/2 NPT 060L328066 Steel 18/8 110 G 1/2 A 060L326866
110 G 1/2 A 060L327166 110 1/2 NPT 060L327066
110 G 1/2 A (ISO 228/1) 060L340666
110 G 3/4 A (ISO 228/1) 060L340366
Brass 160 G 1/2 A 060L326366 Steel 18/8 160 G 1/2 A 060L326966
160 G 3/4 A (ISO 228/1) 060L340566
Brass 200 G 1/2 A 060L320666 Steel 18(8 200 G 1/2 A 060L323766
200 G 1/2 A (ISO 228/1) 060L340866 200 G 3/4 A 060L323866
200 G 3/4 A (ISO 228/1) 060L340266
Brass 250 G 1/2 A 060L325466
Supplied without gland nut, Brass 330 G 1/2 A 060L325566
gaskets and washer
Brass 400 G 1/2 A 060L325666

Part Description Code no.

For KPS thermostats with remote

Clamping band 017-420466
sensor (L = 392 mm)

For KPS thermostats with sensor fitted in a sensor pocket. Compound for
Heat-conductive
filling sensor pocket to improve heat transfer between pocket and sensor.
compound 041E0114
Application range for compound:between pocket and sensor.
(4.5 cm2 tube)
Application range for compound: –20 to +150 °C, momentarily up to 220°C.
Gasket set For KPS thermostats without armoured capillary tubes 060L327366

Gasket set For KPS thermostats with armoured capillary tubes 060L036666

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Technical brochure Pressure and temperature controls, type KPS

Installation Installation Flow velocity of the medium is also of

Location of unit: KPS thermostats are designed to significance. (The optimum flow velocity for
withstand the shocks that occur, e.g. in ships, on liquids is about 0.3 m/s).
compressors and in large machine installations. For permissible media pressure see fig. 2.
KPS thermostats with remote sensor are fitted
Brass Stainless steel
with a base of 3 mm steel plate for fixing to
bulkheads, etc. KPS thermostats with bulb sensor
are self-supporting from the sensor pocket.

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 58Pb to DIN 17661.
Fig. 2. Permissible media pressure on the
sensor pocket as a function of temperature
Sensor pocket, stainless steel 18/8
Material designation 1.4305 to DIN 17440. Setting
When the thermostat cover is removed, and the
Sensor position locking screw (5, fig. 3) is loosened, the range can
As far as possible the sensor should be positioned be set with the spindle (1) while at the same time
so that its longitudinal axis is at right angles to the scale (2) is being read.
the direction of flow. The active part of the sensor In units having an adjustable differential, the
is Ø13 mm x 50 mm long on thermostats with spindle (3) can be used while the scale (4) is
rigid sensors and 2 m capillary tube. The active being read.
length on the other thermostats is 70 mm (5 m
and 8 m capillary tubes). 1. Range
spindle
The medium 2. Range
The fastest reaction is obtained from a medium scale
having high specific heat and high thermal 3. Differential
spindle
conductivity. It is therefore advantageous to use
4. Differential
a medium that fulfills these conditions (provided scale
there is a choice). 5. Locking
screw
Fig. 3

Scale correction
The sensor on KPS thermostats contains an Scale deviation factor
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 and bellows and capillary tube.
Under normal conditions this is of no importance, Relative
but if the thermostat is to be used in extreme scale
setting
ambient temperatures there will be a scale
in %
deviation. The deviation can be compensated for as
follows:
Scale correction = Z x a
Z can be found from fig. 4, while a is the correction
factor from the table below.

Regulation Correction factor a

range for thermostats
Type with rigid with 2 and with 8 m
sensor 5 m cap. cap. tube Fig. 4
°C tube
KPS 76 -10 - +30 1.1
KPS 77 20 - 60 1.0 1.4
KPS 79 50 - 100 1.5 2.2 2.9
KPS 80 70 - 120 1.7 2.4 3.1
KPS 81 60 - 150 3.7
KPS 83 100 - 200 6.2

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Technical brochure Pressure and temperature controls, type KPS

Examples Example 1 Example 2

A diesel engine with cooling water temperature Find the necessary scale correction for a KPS 80
of 85 °C (normal). An alarm must be triggered if set at 95 °C in 50 °C ambient temperature.
the cooling water temperature exceeds 95 °C.
Choose a KPS 80 thermostat (range 70 to 120 °C). The relative scale setting Z can be calculated
Main spindle setting: 95 °C. from the following formula:
Differential spindle setting: 5 °C.
The required alarm function is obtained by Setting value – min. scale value x 100 = %
connecting to thermostat terminals 1-4. After max. scale value – min. scale value
the system has been in operation, assess the
operating differential and make a correction if Relative scale setting: 95 – 70 x100 = 50%
necessary. 120 – 70

Factor for scale deviation Z (fig. 4 page 11),

Z @ 0.7
Correction factor a (table under fig. 4
page 11) = 2.4

Scale correction = Z × a = 0.7 × 2.4 = 1.7 °C

The KPS must be set at 95 + 1.7 = 96.7 °C

12 IC.PD.P10.C3.02 / 520B4703 © Danfoss A/S (IA-MO / jmn), 12 - 2011