Danfoss KP 34, KP, KP 35, KP 36, KP 37 Data sheet

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Data Sheet
Pressure switches and thermostats Type KP
For steam, air, gaseous and liquid media
KP Pressure Switches
Danfoss KP switches are used for regulating, monitoring and alarm systems in the industry. They provide automatic limit protection or manual reset limit protection for pressure systems. Can be used with steam, air, gaseous and liquid media.
The pressure switches are tted with single­pole changeover switch (SPDT). The position of the switch depends on the setting of the pressure switch and the pressure in the connector.
KP Thermostats
KP thermostats are temperature-operated electric circuit breakers. The thermostats are tted with single-pole changeover switch (SPDT)
The position of the switch depends on the thermostat setting and sensor temperature. A KP thermostat can be connected and switch to single-phase alternating current motors of up to 2 kW.
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Key sketch of KP pressure switch
Simplied drawing of KP pressure switch without front cover and scale.
Version with manual reset.
Range setting spindle
Dierential setting spindle
Main arm
Main spring
Dierential spring
Bellows
Pressure connector
Contact system
Switch terminals
Ground terminal
Cable entry: ½ in female NPSM
Tumbler
Locking screw
Manual reset
Distance plate
Pressure switches and thermostats, Type KP
Features
• Wide regulating range
• Small dimensions Space-saving, easy to install in panels
• Shock and impact resistant
• Ultra-short bounce time. Limits wear to an absolute minimum and increases reliability
• Snap action electrical contacts minimize chatter, bounce, and wear, and ensure long term electrical and
mechanical reliability
• Electrical connection from front of the unit. Makes rack mounting easier and also saves space
• Suitable for alternating current and direct current
• Screwed wiring, makes rewiring easy
• Manual trip allows electrical function test without tools
• Versions with automatic and manual reset available
Functions
Pressure switches
Table 1: Design and function
The contact system of KP switches has a snap-action function and the bellows moves only when cut-in or cut-out set point is reached.
The design has the following advantages:
• higher contact load
• ultra short bounce time
• long mechanical and electrical lifetime
• high resistance to vibrations and pulsations
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15
Key sketch of KP 79, KP 81 thermostats
Simplied drawing of KP thermostat without front cover and scale.
Version with manual reset.
Range setting spindle
Dierential setting spindle
Main arm
Main spring
Dierential spring
Bellows
Temperature sensors
Contact system
Terminals
Ground terminal
Cable entry: ½ in female cable
gland
Tumbler
Locking screw
Manual reset
Distance plate
Pressure switches and thermostats, Type KP
Thermostats
Table 2: Design and function
The contact system of KP switches has a snap-action function and the bellows moves only when cut-in or cut-out set point is reached.
The design has the following advantages:
• higher contact load
• ultra short bounce time
• long mechanical and electrical lifetime
• high resistance to vibrations and pulsations
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Features
Descriptions
Ambient temperature
-40 – 150 ˚F (175 ˚F for short period of time)
Media temperature
-40 – 212 ˚F
Sensor material
Tinned copper Cu/Sn5
Parts in contact with medium:
Bellows:
Stainless steel
Pressure connection:
Free-cutting steel, nickel plated
Wire dimension
12 AWG max.
Contact system
SPST (close on temp. rise), SPDT
Contact material AgCdO
Contact load
Alternating current
FLA
0.5 ~ 16 A/120 V AC
0.5 ~ 8 A/240 V AC
LRA
96 A/120 V AC 48 A/240 V AC
Direct current
240 V DC: 12 W pilot duty
Enclosure
NEMA ~1 (when mounted on a at surface with all unused holes covered)
Cable entry
Integral ½ in female NPSM swivel cable connector, allows direct attachenments of ½ in. male pipe thread connector
Features
Descriptions
Ambient temperature
-40 – 150 ˚F (175 ˚F for short period of time)
Sensor material
Tinned copper Cu/Sn5
Wire dimension
12 AWG max.
Contact system
SPDT – single pole double throw
Contact load
Alternating current
FLA
0.5 ~ 16 A/120 V AC
0.5 ~ 8 A/240 V AC
LRA
96 A/120 V AC 48 A/240 V AC
Direct current
240 V DC: 12 W pilot duty
Enclosure
NEMA ~1 (when mounted on a
at surface with all unused holes covered)
Cable entry
Integral ½ in female NPSM swivel cable connector, allows direct attachenments of ½ in. male pipe thread connector
Switch type - single pole double throw
Switch action
Application
Terminals 1 – 4 close high and open low Terminals 1 – 2 can be used as low pressure alarm
Low pressure cut-out
Terminals 1 – 2 open high and close low Terminals 1 – 4 can be used as high pressure alarm
High pressure cut-out
Pressure switches and thermostats, Type KP
Product specication
Technical data
Pressure switches
Table 3: Technical data
Thermostats
Table 4: Technical data
Contact system and application
Pressure switches
Table 5: Contact system and application
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Switch type - single pole double throw
Switch action
Application
Terminals 1 – 4 close high and open low Terminals 1 – 2 can be used as low temperature alarm
Low pressure cut-out
Terminals 1 – 2 open high and close low Terminals 1 – 4 can be used as high temperature alarm
High pressure cut-out
Pressure switches and thermostats, Type KP
Thermostats
Table 6: Contact system and application
Setting
Pressure switches
Cut-in and cut-out pressures of the system should always be checked with an accurate pressure gauge.
Pressure setting for switches with automatic reset.
Set the cut-out pressure on RANGE scale and dierential on DIFF scale.
NOTE:
Restart pressure is equal to cut-out pressure minus dierential value.
Pressure switches with manual reset
Set the cut-out pressure on the RANGE scale. Pressure limiters can be manually reset by pressing reset button when the pressure is equal to the cut-out pressure minus xed value of the dierential.
Thermostats
Thermostats with automatic reset
Set the cut-out temperature on the RANGE scale and dierential on the DIFF scale. Restart temperature is equal to the cut-out temperature minus dierential value.
NOTE:
The dierential scale is only a reference. The exact value of distances on the scale depends on where in its range the switch cut-in is set. Use the dierential scale as a guide, and if precise function is required, establish the dierential setting by comparing function with an accurate thermometer in the controlled zone.
Thermostats with manual reset
Set the cut-out temperature on the range scale.
The dierential is xed. Restart the system by pressing the reset button after the temperature of the sensor falls to a value equal to the range scale setting minus the xed dierential.
Terminology
Pressure switches
Set point
A predetermined value to which a switch is adjusted and at which it performs its intended function.
Reset:
1.
Manual reset: Units with manual reset can only be restored to operational mode by activation of the external reset button.
2.
Automatic reset: Units with automatic reset is restored to operational mode automatically.
Maximum working pressure
The maximum permissible pressure for safe functioning of a heating system or any of its part.
Snap function
A specic contact force is maintained until snap is initiated. The time over which contact force reaches zero is a few milliseconds; therefore, contact bounce cannot occur as a result, for example, of slight vibrations before cut-out. The snap-action contact system will continue to function even when micro-welds are created between the contacts during cut-in. The force created to separate the contacts is strong, and instantly shears o all contact surface welds
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A
B
C
D
ABCDAdsorption charge
Bellows
Capillary tube
Sensor
Pressure switches and thermostats, Type KP
that have been created as the result of cut-in action. These design features ensure that the cut-out point of the KP switch remains very accurate and completely independent of the magnitude of the current load.
FLA - Motor Full Load Amperes
FLA is the largest current that a motor or other device is designed to carry at rated voltage and other specic conditions. Also often called current at rated conditions.
LRA - Locked Rotor Amperes
LRA is the current in amperes drawn by an electric motor with the shaft or rotor immobilized.
Thermostats
Dierential
The dierential is the dierence between the cut-in and cut-out temperatures. The dierential is necessary for satisfactory automatic operation of the controlled system. Mechanical dierential (intrinsic dierential). The mechanical dierential is the dierential set by the dierential spindle.
Reset:
1.
Manual reset: Units with manual reset can only be restarted after activation of the reset button. On max reset units the set value is equal to cut-out value for rising temperature.
2.
Automatic reset: Units with automatic reset is restored to operational mode automatically.
Snap function
A specic contact force is maintained until snap is initiated. The time over which contact force reaches zero is a few milliseconds; therefore, contact bounce cannot occur as a result, for example, of slight vibrations before cut-out. The snap-action contact system will continue to function even when micro-welds are created between the contacts during cut-in. The force created to separate the contacts is strong, and instantly shears o all contact surface welds that have been created as the result of cut-in action. These design features ensure that the cut-out point of the KP switch remains very accurate and completely independent of the magnitude of the current load.
FLA - Motor Full Load Amperes
FLA is the largest current that a motor or other device is designed to carry at rated voltage and other specic conditions. Also often called current at rated conditions.
LRA - Locked Rotor Amperes
LRA is the current in amperes drawn by an electric motor with the shaft or rotor immobilized.
Thermostat charge
Figure 1: Thermostat charge
Sensors with adsorption charges contain a superheated gas together with a solid having a large adsorption surface. The sensor can be placed in zones that are warmer or colder than the switch housing and capillary tube, but variations of more than 70 °F may inuence scale accuracy.
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Figure 2: KP 35, KP 36 and KP 37
Figure 3: KP 34
Approximate weight: 0.83 lb
Approximate weight: 0.9 lb
Pressure switches and thermostats, Type KP
Dimensions [in]
Pressure switches
Table 7: Dimensions
Thermostats
Figure 4: KP 79, KP 81
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Type
Range [psig]
Dierential [psi]
Reset
Pressure connec‐
tion
Max. operating
pressure [psig]
Min. burst pres‐
sure [psig]
Code nos
KP 34
2 – 15
2 – 6
Automatic
¼” 18 NPT58435
060-214991
KP 34
2 – 15
3 xed
Manual
¼” 18 NPT58435
060-214891
KP 35
6 – 50
6 – 32
Automatic
¼” 18 NPT
145
1015
060-215191
KP 35
6 – 50
7 xed
Manual
¼” 18 NPT
145
900
060-215091
KP 36
15 – 150
10 – 58
Automatic
¼” 18 NPT
245
1015
060-214491
KP 36
15 – 150
10 xed
Manual
¼” 18 NPT
245
1015
060-214591
KP 37
58 – 300
26 – 45
Automatic
¼” 18 NPT
405
1450
060-214691
KP 37
58 – 300
43 xed
Manual
¼” 18 NPT
405
1450
060-214791
Type
Setting Range [˚F]
Dierential [˚F]
Reset function
Capillary tube
length [in]
Max. sensor temper‐
ature [˚F]
Code nos
KP 79
122 – 210
9 – 27
Automatic
80
300
060L223866
KP 79
122 – 210
10 xed
Manual80300
060L223966
KP 81
176 – 240
9 – 45
Automatic
80
480
060L224066
KP 81
176 – 240
16 xed
Manual80480
060L224166
Part
Symbol
Description
Code no.
Brackets with mounting screws and washers for pressure switches and thermostats
Angle bracket 4 screws 10–32 UNC + 4 washers
060-105366
Top cover for pressure switches and thermostats
When the bracket is mounted on the back plate of the hous­ing, the grade of enclosure of the KP switch is IP44. Top cover covers the setting spindles.
060-109766
Document type
Approvals Authority
Electrical - Safety
Certicate
CCC
Manufacturer Declaration
EAC
EU Declaration
CE/ LVD
Food and Health - Performance
Certicate
PZH
Marine safety
certicate
RINA
Marine Approval
RMRS
Manufacturer Declaration
RoHS China
Electrical - Safety
Certicate
FM
Electrical - Safety
Certicate
UL
Pressure switches and thermostats, Type KP
Ordering
Pressure switches
Table 8: Ordering
Thermostats
Table 9: Ordering
Table 10: Accessories
Certicates, declarations, and approvals
The list contains all certicates, declarations, and approvals for this product type. Individual code number may have some or all of these approvals, and certain local approvals may not appear on the list.
Some approvals may change over time. You can check the most current status at danfoss.com or contact your local Danfoss representative if you have any questions.
Table 11: Certicates, declarations, and approvals
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