Pressure switch

Relative pressure switch
Type 521

The compact type 521 pressure switch is based upon theHuba Control developed thick film technology where thepressure measuring cell is fully welded.
Switching points set in factory are available both N/C andN/O function. Various electrical and pressure connections areavailable to suit given applications.

Pressure range
0 ... 2.5 – 600 bar+ Compact, rugged construction+ Welded without sealing parts+ Saving time by quick cable mounting by the customer
with swift connector+ Large selection of connections available

Pressure and flowHuba Control Type 521 | Technical data subject to change | Edition 09/2020

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Technical overview
Pressure range
Relative

0 ... 2.5 – 600 bar

Operating conditions
MediumLiquids, gases and refrigerants (incl. ammonia)
Medium-40 ... +135 ºC
Ambient-30 ... +85 ºC
Storage-50 ... +100 ºC< 6 bar
5 x FS> 6 bar3 x FS (max. 1500 bar)
< 6 bar
10 x FS> 6 bar
6 x FS (max. 2500 bar)Temperature
Tolerable overload
Rupture pressure
Materials
Pressure Connection
Plug accommodation

Pressure connection
SensorMaterials in contact with medium
Electrical overview
OutputSwitching contact
Switch load
Power supply
Current consumption
Insulation voltage

High-Side Switch (PNP)

Stainless steel 1.4404 / AISI 316L (inside thread Schrader 1.4305 / AISI 303 only)
Polyarylamide 50% GF UL 94 V-0
Stainless steel 1.4404 / AISI 316L (inside thread Schrader 1.4305 / AISI 303 only)
Stainless steel
Semiconductor (open collector)
N/C contact or N/O contact
High-Side Switch (PNP) max. 200 mA

7 ... 33 VDC< 4 mA
500 VDC

Dynamic response
Response time
Load cycle< 2 ms, 1 ms typ.
< 100 HzAdjustment of switching points (factory set)
Upper switching point
Lower switching point
Hysteresis

8 ... 100% fs
5 ... 97% fs> 3 % fs

Electrical connection
Swift connector with or without cable 1.5 mConnector M12x1
Pressure connection

Protection standard
IP 67
IP 67
/16 - 20 UNF
G¼½ -14 NPT
M20x1.5
7/16 - 20 UNF¼ -18 NPT
G¼
R¼
G½
G½

without or with Schraderwith O-Ring seal FPM (-30 ... +135 ºC)< 60 bar
sealed at front and manometer (combi)
sealing cone 45º7

Inside thread

Outside threadProtection classIIIIII

sealed at back DIN EN ISO 1179-2 with Profile seal ring in FPM (-30 ... +135 ºC)
EN 10226
sealed at back and manometer (combi) with Profile seal ring in FPM (-30 ... +135 ºC)
sealed at front

Installation arrangement
Unrestricted
Tests / Admissions
Electromagnetic compatibility
Shock acc. IEC IEC 68-2-27
Constant shock acc. IEC 68-2-29
Vibration acc. IEC 68-2-6
ULEAC

CE conformity acc. EN 61326-2-3 and 50121-3-2
100 g, 11 ms half sine wave, all 6 directions, free fall from 1 m on concrete (6x)40 g for 6 ms, 1000x all 3 directions
20 g, 15 ... 2000 Hz, 15 ... 25 Hz with amplitude ± 15 mm, 1 Octave/min. all 3 directions, 50 constant load
ANSI/UL 61010-1 acc. E325110

Weight~ 90 g
Packaging (Please state on order)
Single packaging in cardboard
Multiple packaging in cardboard (25 pcs)

accessories integrated

Accuracy
Parameter
Switching points 1)
Resolution
Thermal characteristic 2)
Long term stability acc. IEC EN 60770-11)

2/6

typ. ; max. 1.0% fs (incl. hysteresis and repeatability)

Pressure and flow

Unitmax.
max.

% fs% fs% fs/10K% fsTest conditions:25ºC, 45% RH, power supply 24 VDC± 0.50.1± 0.2± 0.252)-15 ... 85 ºC

Huba Control Type 521 | Technical data subject to change | Edition 09/2020

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Order code selection table in bar

Pressure range 1)

VersionSwitching contact
Electrical connection

Pressure connection 3)

Pressure tip orifice 2)Materialpressure connection
Switching points

9999999999999

Switching contact
Electrical connection

Pressure connection 3)

Pressure tip orifice 2)Materialpressure connection
Switching points1)

Pressure and flow

56789101111133334444554570123012345S
S01

122345603L

70K
1DE
23478980029N
11111
1111
1
N
1

10W
11521. X X X X X X X X X X X

0 ... 30 psi
0 ... 60 psi
0 ... 100 psi
0 ... 200 psi
0 ... 300 psi
0 ... 500 psi
0 ... 750 psi
0 ... 1000 psi
0 ... 2000 psi
0 ... 3000 psi
0 ... 5000 psi
0 ... 7500 psi
standard
for oxygen applications
Contact N/O
High-Side-Switch PNPContact N/CHigh-Side-Switch PNP
Swift connector
without cable2)
Connector M12x1
Swift connector with cable 1.5 m
7/16 -20 UNF sealing cone with Schrader7/16 -20 UNF
Inside thread
G ¼ wiht O-Ring seal FPM½ -14 NPT (< 870 psi)
M20x1.5 sealed at front and manometer (combi)
7/16 -20 UNF sealing cone
¼ -18 NPT
Outside thread
G ¼ sealed at back DIN EN ISO 1179-2 with Profile seal ring in FPM
R ¼ acc. to EN 10226
G ½ sealed at back and manometer with Profile seal ring in FPM
G ½ sealed at front
without (Inclusive pressure tip orifice from 2000 psi on)
with
Stainless steel 1.4305 / AISI 303
Stainless steel 1.4404 / AISI 316L
Indicate W and state switching points on order (e.g.: W1000/400psi)

Other pressure ranges on request

401Version

3521. X X X X X X X X X X X

0 ... 2.5 bar
0 ... 4 bar
0 ... 6 bar
0 ... 10 bar
0 ... 16 bar
0 ... 25 bar
0 ... 40 bar
0 ... 60 bar
0 ... 100 bar
0 ... 160 bar
0 ... 250 bar
0 ... 400 bar
0 ... 600 bar
standard
for oxygen applications
Contact N/OHigh-Side-Switch PNPContact N/C
High-Side-Switch PNP
Swift connector
without cableConnector M12x1 2)
Swift connector with cable 1.5 m
7/16 -20 UNF sealing cone with Schrader
7/16 -20 UNF
Inside thread
G ¼ with O-Ring seal FPM½ -14 NPT (< 60 bar)
M20x1.5 sealed at front and manometer (combi)
7/16 -20 UNF sealing cone
¼ -18 NPT
G ¼ sealed at back DIN EN ISO 1179-2 with Profile seal ring in FPM
Outside thread
R ¼ acc. to EN 10226
G ½ sealed at back and manometer with Profile seal ring in FPM
G ½ sealed at frontwithout (Inclusive pressure tip orifice from 100 bar on)
withStainless steel 1.4305 / AISI 303
Stainless steel 1.4404 / AISI 316L
Indicate W and state switching points on order (e.g.: W100/60bar)

Order code selection table in psi

Pressure range 1)

22)

Delivery without female connector

999999999999B
B
B
CC
C
D
DDD
E
E

4
5
7
1
2
30
12
3
45SS0103)

1203
L0K
1DE
234789002N
1
111111111N1WOther pressure connections on request

Huba Control Type 521 | Technical data subject to change | Edition 09/2020

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1

Order code selection table in MPa

Pressure range 1)

VersionSwitching contact
Electrical connection

Pressure connection 3)

Pressure tip orifice 2)Materialpressure connection
Switching points

3

4

5

6

7

8

91011521. X X X X X X X X X X X

0 ...0.25 MPa
0 ... 0.4 MPa
0 ... 0.6 MPa
0 ... 1 MPa
0 ... 1.6 MPa
0 ... 2.5 MPa
0 ... 4 MPa
0 ... 6 MPa
0 ... 10 MPa
0 ... 16 MPa
0 ... 25 MPa
0 ... 40 MPa
0 ... 60 MPa
standardfor oxygen applications
Contact N/O
High-Side-Switch PNPContact N/C
High-Side-Switch PNP
Swift connector without cableConnector M12x1 2)
Swift connector with cable 1.5 m
7/16 -20 UNF sealing cone with Schrader
7/16 -20 UNF
Inside thread
G ¼ wiht O-Ring seal FPM½ -14 NPT (< 6 MPa)
M20x1.5 sealed at front and manometer (combi)
7/16 -20 UNF sealing cone
¼ -18 NPT
G ¼ sealed at back DIN EN ISO 1179-2 with Profile seal ring in FPM
Outside thread
R ¼ acc. to EN 10226
G ½ sealed at back and manometer with Profile seal ring in FPM
G ½ sealed at front
without (Inclusive pressure tip orifice from 10 MPa on)
with
Stainless steel 1.4305 / AISI 303
Stainless steel 1.4404 / AISI 316L
Indicate W and state switching points on order (e.g.: W10/5MPa)

9999999999999GGGH
H
H
H
KK
KK
L
L

4
5
70
1
2
30
12
345S
S

01

1
2003L

0K
1DE
234789002N
1
111111111N1W

Accessories (supplied loose)

Order number

Swift connector
Corner-wire box for connector M12x1 with cable 2.0 m
Corner-wire box for connector M12x1
Straight-wire box for connector M12x1
Straight-wire box for connector M12x1 with cable 2.0 m
Mounting bracket with screw
Heat sink with outside thread G ½ sealed at front - inside thread G ½
Heat sink with outside thread G ½ sealed at front - inside thread G ¼
Heat sink with outside thread G ¼ sealed at front - inside thread G ¼
Calibration certificate (at factory set switching points)117312
114604106975114570114605118716105631105073105074104551

Mounting bracket1)

4/62

Other pressure ranges on request

Pressure and flow

Heat sink2)

Delivery without female connector

3)

Other pressure connections on request

Huba Control Type 521 | Technical data subject to change | Edition 09/2020

Dimensions in mm / Electrical connections

Swift connector

272445˚27 Nm

10 Nm

Code Nr.: 8

Code Nr.: 224

24

1= brown 2=green 3=white
24 Nm

20 Nm

Code Nr.: 9

Code Nr.: 7

G 1/4 inside

24Connector M12x1

2430 Nm

20 Nm

Code Nr.: E

Code Nr.: 11 (IN) 4 (OUT) 3 (GND)

1/2-14 NPT
insideInside thread
7/16 - 20 UNF
Schrader

24

24

30 Nm

20 Nm

Code Nr.: D

Code Nr.: 424

24

10 Nm

20 Nm

Code Nr.: 0, K

Code Nr.: 3Function
N/C contact: When pressure is applied (p0  pmax) the switch will disconnect the applied load as soon as the upper switching point is reached.
As the pressure falls (pmax  p0) the switch will connect the load as soon as the lower switching point is reached.

N/C contact

N/O contact: When pressure is applied (p0  pmax) the switch will connect the applied load as soon as the upper switching point is reached.
With a fall in pressure (pmax  p0) the switch will disconnect the load as soon as the lower switching point is reached.

p081220

N/O contact

Example: pfs 20 bar
Upper switching point
Lower switching point
max. switching loadPNP
12 bar8 bar
100 mA+IN

OUT
RL
p08

12Pressure and flow

20GND-Huba Control Type 521 | Technical data subject to change | Edition 09/2020

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