BSW Series
Solid state pressure switch with analog output
FEATURES
· 0...70 mbar to 0...10 bar
· Differential, gage and absolute
pressure options
· Adjustable threshold point
· Adjustable hysteresis
· 1 - 5 V analog output
· Low side and high side switching
output
· LED status indicator
· Long term stability 0.1 % / year
SERVICE
Pressure inlet: Non-corrosive, non-ionic pressure
media, such as dry air and dry gases.
Scale:
1 cm
1 inch
SPECIFICATIONS
Maximum ratings
Supply voltage
Output current
Analog output
Switching output 1 (pnp)
Switching output 2 (npn)
Temperature limits
Storage
Operating
Compensated
Proof pressure
1
BSWM...
BSW001... to BSW005...
BSW010...
11 to 30 V
ELECTRICAL BLOCK DIAGRAM
1
+Vs
LOAD
20 mA
100 mA
300 mA
-55 to 100°C
-40 to 85°C
0 to 70°C
1.4 bar
2 x rated press.
1.5 x rated press.
Ψ
V
Reg.
8V
LED
Pressure
Analog
2
out
5
Switch 2
out
Switch 1
4
out
V
3
Threshold set
Hysteresis set
LOAD
-Vs
GND
March 2001 / 016
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BSW Series
Solid state pressure switch with analog output
PERFORMANCE CHARACTERISTICS
(unless otherwise noted V
S
= 15 V, t
amb
= 25°C)
Characteristics
Operating pressure (differential/gage)
2
BSWM070D...
BSWM350D...
BSW001D...
BSW002D...
BSW005D...
BSW010D...
BSW001A...
BSW002A...
BSW005A...
Min.
0
0
0
0
0
0
0
0
0
Typ.
Max.
70
350
1
2
5
10
1
2
5
Unit
mbar
bar
Operating pressure (absolute)
3
ANALOG OUTPUT
Zero pressure offset
Full scale output
Full scale span
4
Non-linearity and hysteresis (BSL)
5
Thermal effects (0 - 70°C)
6
Combined offset and span
BSWM070D...
BSWM350D...
all others
7
Long term stability
0.8
4.8
1.0
5.0
4.0
0.2
±0.04
±0.03
±0.02
0.1
1.2
5.2
1.0
±0.20
±0.15
±0.10
V
%FSO
%FSO/°C
%FSO
SWITCHING OUTPUT
Switching output 1
Switching output 2
Output voltage (high) Switching output 1
Output voltage (low) Switching output 2
Status indication
Threshold point setting
8
Hysteresis setting
8
Switching frequency
Switch point repeatability
7
20
1
pnp, open collector, load switched to ground
npn, open collector, load switched to +Vs
7.5
V
0.5
1.2
red LED
100
%
10
1
kHz
%FSO
0.2
Specification notes:
1.
2.
3.
4.
5.
6.
7.
8.
Proof pressure is the maximum pressure which may be applied without causing damage to the sensing element.
The output signal of all BSW...D-PCB is proportional to the pressure applied to port P2, relative to port P1, e.g. the output signal
increases when vacuum is applied to port P1 relative to port P2.
The output signal of all BSW...A-PCB is proportional to the absolute pressure applied to port P1.
Span is the algebraic difference between the output at full scale pressure and offset.
Non-linearity refers to the
Best Straight Line
fit measured for offset, full scale and 1/2 full scale pressure.
Temperature shift tested and guaranteed at 70°C relative to 25°C. All specs are shown relative to 25°C.
Difference in output/switch point at any pressure within the operating pressure range and temperature within 0 - 70°C after:
a) 1000 temperature cycles, 0 - 70°C
b) 1 million pressure cycles 0 bar to full scale pressure
switching
Hysteresis setting has a direct influence on the switching points
output
when the pressure increases or decreases.
The switching points can be calculated as follows:
Output going active (LED on)
when pressure exceeds SET POINT + hysteresis/2
Output going inactive (LED off)
when pressure falls below SET POINT - hysteresis/2
pressure
setpoint
1/2 1/2
hyst. hyst.
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March 2001 / 016
www.sensortechnics.com
BSW Series
Solid state pressure switch with analog output
HYSTERESIS AND SWITCH POINT SETTING
Function
Hysteresis
Switching point
Change per scale unit
≈
0.9 %FS
≈
7.3 %FS
ORDERING INFORMATION
Part number
Package version
Pressure range
Differential/Gage devices
0 - 70 mbar
0 - 350 mbar
0 - 1 bar
0 - 2 bar
0 - 5 bar
0 - 10 bar
Absolute devices
0 - 1 bar
0 - 2 bar
0 - 5 bar
Side facing ports
BSWM070DV-PCB
BSWM350DV-PCB
BSW001DV-PCB
BSW002DV-PCB
BSW005DV-PCB
BSW010DV-PCB
BSW001AV-PCB
BSW002AV-PCB
BSW005AV-PCB
Top facing ports
BSWM070DH-PCB
BSWM350DH-PCB
BSW001DH-PCB
BSW002DH-PCB
BSW005DH-PCB
BSW010DH-PCB
BSW001AH-PCB
BSW002AH-PCB
BSW005AH-PCB
Sensortechnics reserves the right to make changes to any products herein. Sensortechnics does not assume any liability arising out of the
application or use of any product or circuit described herein, neither does it convey any license under its patent rights nor the rights of others.
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March 2001 / 016
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