Operating instructions Combined pressure sensor PN22xx

Operating instructions Combined pressure sensor PN22xx
Operating instructions
Combined pressure sensor
UK
704829 / 00
08 / 2010
PN22xx
Contents
1 Preliminary note���������������������������������������������������������������������������������������������������3
1.1 Symbols used������������������������������������������������������������������������������������������������3
2 Safety instructions�����������������������������������������������������������������������������������������������3
3 Function and features������������������������������������������������������������������������������������������4
4 Function���������������������������������������������������������������������������������������������������������������5
4.1 Communication, parameter setting and evaluation���������������������������������������5
4.2 Switching function������������������������������������������������������������������������������������������6
4.3 Analogue function �����������������������������������������������������������������������������������������6
5 Installation�����������������������������������������������������������������������������������������������������������8
6 Electrical connection��������������������������������������������������������������������������������������������8
7 Operating and display elements��������������������������������������������������������������������������9
8 Menu������������������������������������������������������������������������������������������������������������������10
8.1 Menu structure���������������������������������������������������������������������������������������������10
8.2 Explanation of the menu������������������������������������������������������������������������������ 11
9 Parameter setting����������������������������������������������������������������������������������������������12
9.1 Parameter setting general���������������������������������������������������������������������������12
9.2 Setting the output signal������������������������������������������������������������������������������14
9.2.1 Setting the output function������������������������������������������������������������������14
9.2.2 Setting the switching limits�����������������������������������������������������������������14
9.2.3 Scaling the analogue value����������������������������������������������������������������14
9.3 User settings (optional)��������������������������������������������������������������������������������15
9.3.1 Setting the unit of measurement for the system pressure������������������15
9.3.2 Configuring the display�����������������������������������������������������������������������15
9.3.3 Zero-point calibration��������������������������������������������������������������������������15
9.3.4 Setting the delay time for the switching outputs���������������������������������15
9.3.5 Setting the output polarity�������������������������������������������������������������������16
9.3.6 Setting the damping for the switching outputs������������������������������������16
9.3.7 Setting the damping for the analogue output��������������������������������������16
9.4 Service functions�����������������������������������������������������������������������������������������16
9.4.1 Reading the min./max. values for the system pressure����������������������16
10 Operation���������������������������������������������������������������������������������������������������������17
10.1 Read the set parameter values�����������������������������������������������������������������17
10.2 Fault indication������������������������������������������������������������������������������������������17
2
11 Scale drawing ..................................................................................................18
12 Technical data ..................................................................................................18
12.1 Setting ranges ...........................................................................................20
13 Factory setting .................................................................................................22
1 Preliminary note
1.1 Symbols used
►
>
[…]
→
Instruction
Reaction, result
Designation of buttons, switches or indications
Cross-reference
Important note
Non-compliance can result in malfunctions or interference.
UK
2 Safety instructions
• Read this document before installing the unit. Ensure that the product is suitable for your application without any restrictions.
• Non-adherence to the operating instructions or technical data can lead to
personal injury and/or damage to property.
• In all applications check compliance of the product materials (→ chapter 12
Technical data) with the media to be measured.
• Use in gases at pressures > 25 bar only after contacting the manufacturer ifm.
For units with cULus approval and the scope of validity cULus:
The device shall be supplied from an isolating transformer having a secondary
Listed fuse rated as noted in the following table.
Overcurrent protection
Control-circuit wire size
Maximum protective device rating
2
Ampere
AWG
(mm )
26
(0.13)
1
24
(0.20)
2
22
(0.32)
3
20
(0.52)
5
18
(0.82)
7
16
(1.3)
10
The Sensor shall be connected only by using any R/C (CYJV2) cord, having suitable ratings.
3
3 Function and features
The pressure sensor detects the system pressure of machines and installations.
Applications
Type of pressure: relative pressure
Order no.
PN2220
PN2221
PN2222
PN2223
PN2224
PN2226
PN2209
PN2227
PN2228
Permissible
Bursting pressure
overload pressure
bar
PSI
bar
PSI
bar
0...400
8 700
600
14 500
1 000
0...250
5 800
400
12 300
850
0...100
4 350
300
9 400
650
-1...25
1 450
100
5 075
350
-1...10
1088
75
2 175
150
-0.13...2.50
290
20
725
50
mbar
PSI
bar
PSI
bar
-1 000...1 000
290
20
725
50
-50...1 000
145
10
450
30
mbar
inH2O
bar
inH2O
bar
-12.5...250.0
4 000
10
12 000
30
MPa = bar ÷ 10 / kPa = bar × 100
Measuring range
PSI
0...5 800
0...3 630
0...1 450
-14.5...362.5
-14.5...145
-1.45...36.25
PSI
-14.5...14.5
-0.74...14.5
inH2O
-5.0...100.4
Static and dynamic overpressures exceeding the indicated overload pressure are to be avoided by taking appropriate measures.
The indicated bursting pressure must not be exceeded. Even if the bursting pressure is exceeded only for a short time, the unit can be destroyed.
NOTE: Risk of injury!
Use in gases at pressures > 25 bar only after contacting the manufacturer
ifm.
4
4 Function
4.1 Communication, parameter setting and evaluation
• The unit shows the current system pressure on its display.
• It generates 2 output signals according to the parameter setting.
OUT1
OUT2
•switching signal for pressure limit values.
•switching signal for pressure limit values.
•analogue signal for pressure (4...20 mA or 0...10V).
• It moreover provides the process data via IO-Link.
• The unit is laid out for fully bidirectional communication. So, the following op- UK
tions are possible:
-- Remote display: reading and display of the current system pressure.
-- Remote evaluation: transfer of switching signals (only with PP2001).
-- Remote parameter setting: reading and changing current parameter settings
with PP2001, FDT service program ifm Container or via IO-Link.
-- Using PP2001 and the FDT service program ifm Container, the current parameter settings can be stored and transferred to other units of the same type.
The program library of the available DTM objects can be found at www.ifm.com
→ Service → Download.
Device-specific parameter lists for IO-Link parameter setting are available at:
www.ifm.com → Select your country → Data sheet direct:
5
4.2 Switching function
OUTx changes its switching state if it is above or below the set switching limits
(SPx, rPx). The following switching functions can be selected:
• Hysteresis function / normally open: [OUx] = [Hno] (→ fig. 1).
• Hysteresis function / normally closed: [OUx] = [Hnc] (→ fig. 1).
First the set point (SPx) is set, then the reset point (rPx) at the requested distance.
• Window function / normally open: [OUx] = [Fno] (→ fig. 2).
• Window function / normally closed: [OUx] = [Fnc] (→ fig. 2).
The width of the window can be set by means of the distance between SPx and
rPx. SPx = maximum value, rPx = minimum value.
1
2
P = system pressure; HY = hysteresis; FE = window
4.3 Analogue function
• [OU2] defines whether the set measuring range is provided as a 4...20 mA
signal ([OU2] = [I]) or a 0...10 V signal ([OU2] = [U]).
• The analogue start point [ASP] determines at which measured value the output
signal is 4 mA or 0 V.
• The analogue end point [AEP] determines at which measured value the output
signal is 20 mA or 10 V.
Minimum distance between [ASP] and [AEP] = 25 % of the span.
6
Voltage output 0 ... 10 V
Factory setting
Measuring range scaled
UK
P = system pressure, MEW = final value of the measuring range
In the set measuring range the output signal is between 0 and 10 V.
It is also indicated:
System pressure above the measuring range: output signal > 10 V.
Current output 4 ... 20 mA
Factory setting
Measuring range scaled
P = system pressure, MEW = final value of the measuring range
In the set measuring range the output signal is between 4 and 20 mA.
Also signalled:
• System pressure above the measuring range: output signal > 20 mA.
• System pressure below the measuring range: output signal 4...3.8 mA.
7
5 Installation
Before mounting and removing the sensor, make sure that no pressure is
applied to the system.
►► Insert the unit in a ¼" NPT process connection.
►► Tighten firmly.
6 Electrical connection
The unit must be connected by a qualified electrician.
The national and international regulations for the installation of electrical
equipment must be adhered to.
Voltage supply to EN50178, SELV, PELV.
►► Disconnect power.
►► Connect the unit as follows:
2 x p-switching
1 BN
2 WH
2 x n-switching
1 BN
L+
2 WH
4 BK
2: OUT2
4: OUT1
3 BU
L+
4 BK
L
2: OUT2
4: OUT1
3 BU
L
1 x p-switching / 1 x analogue
1 x n-switching / 1 x analogue
1 BN
1 BN
2 WH
L+
2 WH
4 BK
4 BK
2: OUT2
4: OUT1
3 BU
L+
L
2: OUT2
4: OUT1
3 BU
L
Pin 4 (OUT1) = Data channel for bidirectional communication. Note: not to be used when
OUT1 = n-switching.
Core colours of ifm sockets:
1 = BN (brown), 2 = WH (white), 3 = BU (blue), 4 = BK (black).
8
7 Operating and display elements
UK
1 to 8: Indicator LEDs
-- LED 1 to LED 6 = system pressure in unit of measurement as indicated on the label.
-- LEDs 4 to 6 not used for units with 3 adjustable units of measurement.
-- LEDs 5 and 6 not used for units with 4 adjustable units of measurement.
-- LED 7, LED 8 = switching state of the respective output.
9: Alphanumeric display, 4 digits
-- Indication of the current system pressure.
-- Indication of the parameters and parameter values.
10: Set pushbutton
-- Setting of the parameter values (scrolling by holding pressed, incremental by pressing
briefly).
11: Mode/Enter pushbutton
-- Selection of the parameters and acknowledgement of the parameter values.
9
8 Menu
8.1 Menu structure
10
8.2 Explanation of the menu
SP1/rP1
Maximum / minimum value for system pressure, at which output 1 changes
its switching status.
SP2/rP2
Maximum / minimum value for system pressure, at which output 2 changes
its switching status.
OU1
Output function for OUT1:
• Switching signal for the limit values: hysteresis function [H ..] or window
function [F ..], normally open [. no] or normally closed [. nc] each.
OU2
Output function for OUT2:
UK
• Switching signal for the limit values: hysteresis function [H ..] or window
function [F ..], normally open [. no] or normally closed [. nc] each.
• Analogue signal for the current system pressure: 4...20 mA [I] or 0...10 V
[U].
ASP
Analogue start point for the system pressure: measured value at which
4 mA / or 0 V are output.
AEP
Analogue end point for the system pressure: measured value at which
20 mA / or 10 V are output.
EF
Extended functions / Opening menu level 2.
HI Maximum value memory for the system pressure.
LO Minimum value memory for the system pressure.
COF Zero point calibration.
CAr Calibration reset.
dS1/dS2 Switch-on delay for für OUT1 / OUT2.
dr1/dr2 Reset delay für OUT1 / OUT2.
P-n Output polarity: pnp / npn
dAP Damping for the switching outputs
dAA Damping for the analogue output
diS Update rate and orientation of the display.
Uni Standard unit of measurement for the system pressure.
11
9 Parameter setting
During the parameter setting process the unit remains in the operating mode. It
continues its monitoring function with the existing parameters until parameter setting has been terminated.
9.1 Parameter setting general
Each parameter setting requires 3 steps:
1
Parameter selection
►► Press [Mode/Enter] until the
requested parameter is displayed.
2
Setting of the parameter value
►► Press [Set] and keep it pressed.
>> Current setting value of the param eter flashes for 5 s.
>> After 5 s: The setting value is
changed: incremental by pressing briefly or scrolling by holding
pressed.
The numerical values are incremented continuously. If the value is to be reduced: Let
the display move to the maximum setting value. Then the cycle starts again at the
minimum setting value.
3 Acknowledgement of the parameter
value
►► Press [Mode/Enter] briefly.
>> The parameter is displayed again.
The new setting value is stored.
Setting of other parameters:
►► Start again with step 1.
Finishing the parameter setting:
►► Press [Mode/Enter] several times until the current measured value is displayed or wait
for 15 s.
>> The unit returns to the operating mode.
• If [SLoc] is displayed when attempting a modification of a parameter value, the
sensor is locked via software. This locking can only be removed via a parameter setting software.
• In case of parameter setting with the user interface of the ifm Container program, the values can be directly entered in the specified fields.
12
• For IO-Link parameter setting → device-specific parameter lists at: www.ifm.
com → Select your country → Data sheet direct:
• Changing from menu level 1 to menu level 2:
►► Press [Mode/Enter] until [EF] is
displayed.
If the submenu is protected with an access code, [Cod1] flashes in the display.
►► Press [Set] and keep it pressed until
the valid code no. is displayed.
►► Press [Mode/Enter] briefly.
On delivery by ifm electronic: no access
restriction.
►► Press [Set] briefly.
>> The first parameter of the sub-menu
is displayed (here: [HI]).
UK
With the user interface of the ifm Container program:
►► Activate the [EF] button.
If menu level 2 is protected by an access code, the input field for the code no. is
activated.
►► Enter valid code no.
• Locking / unlocking
The unit can be locked electronically to prevent unintentional wrong settings.
►► Make sure that the unit is in the
normal operating mode.
►► Press [Mode/Enter] + [Set] for 10 s.
>> [Loc] is displayed.
During operation: [Loc] is briefly displayed if you try to change parameter values.
►► Press [Mode/Enter] + [Set] for 10 s.
>> [uLoc] is displayed.
On delivery: Unlocked.
13
• Timeout:
If no button is pressed for 15 s while the parameters are being set, the unit returns to
the operating mode with unchanged values.
9.2 Setting the output signal
9.2.1 Setting the output function
►► Select [OU1] and set the switching function:
[Hno] = hysteresis function / normally open,
[Hnc] = hysteresis function / normally closed,
[Fno] = window function / normally open,
[Fnc] = window function / normally closed.
►► Select [OU2] and set the function:
[Hno] = hysteresis function / normally open,
[Hnc] = hysteresis function / normally closed,
[Fno] = window function / normally open,
[Fnc] = window function / normally closed,
[I] = current signal proportional to the pressure 4…20 mA,
[U] = voltage signal proportional to the pressure 0...10 V.
9.2.2 Setting the switching limits
►► Select [SP1] / [SP2] and set the value at which the output switches.
►► Select [rP1] / [rP2] and set the value at which the output switches back.
rPx is always lower than SPx. The unit only accepts values which are lower
than SPx.
9.2.3 Scaling the analogue value
►► Select [ASP] and set value at which 4 mA / 0 V are output.
►► Select [AEP] and set value at which 20 mA / 10 V are output.
Minimum distance between ASP and AEP = 25 % of the span (scaling
factor 1:4).
14
9.3 User settings (optional)
9.3.1 Setting the unit of measurement for the system pressure
►► Select [Uni] and set the unit of measurement:
[bAr], [mbAr]
[MPA], [kPA]
[PSI]
[IH2O] (only PN2209, PN2227, PN2228)
[inHG] (only PN2209)
[mmWS] (only PN2228)
UK
9.3.2 Configuring the display
►► Select [diS] and set update rate and orientation of the display:
[d1]: Update of the measured value every 50 ms.
[d2]: Update of the measured value every 200 ms.
[d3]: Update of the measured value every 600 ms.
[Ph]: Display of the measured peak value remains for a short time (peak
hold).
[rd1], [rd2], [rd3], [rPh]: Display like d1, d2, d3, Ph; rotated by 180°.
[OFF]: The display is deactivated in the operating mode.
9.3.3 Zero-point calibration
►► Select [COF] and set a value between -5 % and 5 % of the final value
of the measuring range (for PN2209 ± 5 % of the span). The internal
measured value “0” is shifted by this amount.
Resets the calibration set by COF to the value set at the factory.
►► Press [Mode/Enter] until [CAr] is displayed.
►► Press [Set] and keep it pressed until [----] is displayed.
►► Press [Mode/Enter] briefly.
9.3.4 Setting the delay time for the switching outputs
[dS1] / [dS2] = switch-on delay for OUT1 / OUT2.
[dr1] / [dr2] = switch-off delay for OUT1 / OUT2.
►► Select [dS1], [dS2], [dr1] or [dr2], set value between 0.1 und 50 s (at 0.0
the delay time is not active).
15
9.3.5 Setting the output polarity
►► Select [P-n], set [PnP] or [nPn].
9.3.6 Setting the damping for the switching outputs
►► Select [dAP], set value between 0.01 ... 4.00 s; (at 0.00 [dAP] time is
not active).
dAP-value = response time between pressure change and change of the
switching status in seconds (s).
Correlation between switching frequency and [dAP]: fmax = 1 ÷ 2dAP..
9.3.7 Setting the damping for the analogue output
►► Select [dAA], set value between 0.01 ... 4.00 s; (at 0.00 [dAA] time is
not active).
dAA-value = response time between pressure change and change of the
switching status in seconds (s).
[dAA] affects the IO-Link process data.
9.4 Service functions
9.4.1 Reading the min./max. values for the system pressure
►► Select [HI] or [LO], press [Set] briefly.
[HI] = maximum value, [LO] = minimum value.
Delete memory:
►► Select [HI] or [LO].
►► Press [Set] until [----] is displayed.
►► Press [Mode/Enter] briefly.
16
10 Operation
After power on of the supply voltage the unit is in the Run mode (= normal operation). It carries out its measurement and evaluation functions and generates output
signals according to the set parameters.
Operating indicators → chapter 7 Operating and display elements.
10.1 Read the set parameter values
►► Press [Mode/Enter] briefly to scroll the parameters.
►► Press [Set] briefly to indicate the corresponding parameter value for 15 s. After
UK
another 15 s the unit returns to the Run mode.
10.2 Fault indication
[OL]
overload pressure (measuring range exceeded)
[UL]
underpressure range (measuring range below the minimum value)
[SC1]
short circuit in OUT1*
[SC2]
short circuit in OUT2*
[SC]
short circuit in both switching outputs*
*The output concerned is switched off as long as the short circuit exists.
This faults are indicated even if the display is deactivated.
17
11 Scale drawing
2
3
34
M12 x1
47
12
57,3
91,5
1
27
30
/ "NPT
14
Dimensions are in millimeters
1: display; 2: LED’s; 3: programming button
12 Technical data
Operating voltage [V].......................................................................................... 18...32 DC1)
Current consumption [mA].............................................................................................. < 35
Current rating [mA].................................................................................................... 2 x 250
Protection: short circuit, reverse polarity, overload
Voltage drop [V] ............................................................................................................... < 2
Power-on delay [s] ........................................................................................................... 0.3
Min. response time switching outputs [ms] ...................................................................... 1.5
Switching frequency [Hz] ........................................................................................max. 500
Analogue output ................................................................................. 4 ... 20 mA / 0...10 V
Max. load current output [Ω] ........................................................................... (Ub - 10) x 50
Min. load with voltage output[Ω] ................................................................................... 2000
Min. response time analogue output [ms] .......................................................................... 3
18
Communication interface .................................................................................... IO-Link 1.0
Baud rate [kBAUD]......................................................................................................... 38.4
Accuracy / deviations (in % of the span)2)
- Accuracy of switch point .......................................................................................... < ± 0.4
- Characteristics deviation..................................................... < ± 0.25 (BFSL) / < ± 0.5 (LS)
- Hysteresis.................................................................................................................... < 0.1
- Repeatability (with temperature fluctuations < 10K)................................................. < ± 0.1
- Long-time stability (in % of the span per year)......................................................... < ± 0.1
- Temperature coefficients (TEMPCO) in the compensated
temperature range 0...80°C (in % of the span per 10 K)
- greatest TEMPCO of the zero point ..................................................................... < ± 0.2 UK
- greatest TEMPCO of the span ............................................................................ < ± 0.2
Materials (wetted parts) .............................stainless steel (303S22); ceramics; FPM (Viton)
Housing material .........stainless steel (304S15); stainless steel (316S12); PBTP (Pocan);
PEI; FPM (Viton)
in addition PTFE for PN2209, PN2223, PN2224, PN2226, PN2227, PN2228
Protection PN2220, PN2221, PN2222.......................................................................... IP 67
Protection PN2209, PN2223, PN2224, PN2226, PN2227, PN2228............................. IP 65
Protection class ................................................................................................................. III
Insulation resistance [MΩ]......................................................................... > 100 (500 V DC)
Shock resistance [g] ............................................................... 50 (DIN / IEC 68-2-27, 11ms)
Vibration resistance [g] ................................................ 20 (DIN / IEC 68-2-6, 10 - 2000 Hz)
Switching cycles min. .......................................................................................... 100 million
Operating temperature [°C] ................................................................................. -25 ... +80
Storage temperature[°C]................................................................................... -40 ... +100
Medium temperature [°C]...................................................................................... -25 ... +80
EMC EN 61000-4-2 ESD: ........................................................................................4 / 8 KV
EN 61000-4-3 HF radiated: ............................................................................. 10 V/m
EN 61000-4-4 Burst: ............................................................................................2 KV
EN 61000-4-5 Surge: ...................................................................................0.5 / 1 KV
EN 61000-4-6 HF conducted: ............................................................................. 10 V
1)
2)
to EN50178, SELV, PELV
all indications are referred to a turn down of 1:1
19
12.1 Setting ranges
PN2226
PN2224
PN2223
PN2222
PN2221 PN2220
PN2209
SP1 / SP2
ASP
AEP
ΔP
min
max
min
max
min
max
min
max
PSI
-14.3
14.5
-14.4
14.4
-14.4
7.3
-7.2
14.5
0.1
inH2O
-396
401
-399
398
-400
201
-199
401
1
inHg
-29.1
29.5
-29.4
29.3
-29.4
14.8
-14.6
29.5
0.1
mbar
-988
1000
-996
992
-996
500
-496
1000
4
kPa
-98.8
100
-99.6
99.2
-99.6
50.0
-49.6
100
0.4
PSI
60
5800
30
5770
0
4350
1450
5800
10
bar
4
400
2
398
0
300
100
400
1
MPa
0.4
40.0
0.2
39.8
0.0
30.0
10.0
40.0
0.1
PSI
30
3625
15
3610
0
2720
905
3625
5
bar
2.0
250.0
1.0
249.0
0.0
187.5
62.5
250.0
0.5
MPa
0.20
25.00
0.10
24.90
0.00
18.57
6.25
25.00
0.05
PSI
12
1450
6
1444
0
1088
364
1450
2
bar
0.8
100.0
0.4
99.6
0.0
75.0
25.0
100.0
0.2
MPa
0.08
10.00
0.04
9.96
0.00
7.50
2.50
10.00
0.02
PSI
-11.5
362.5
-13.0
361.0
-14.5
272.0
76.0
362.5
0.5
bar
-0.80
25.00
-0.90
24.90
-1.00
18.75
5.25
25.00
0.05
MPa
-0.08
2.50
-0.09
2.49
-0.10
1.88
0.53
2.50
0.01
PSI
-12.8
145.0
-13.6
144.2
-14.6
105.2
21.8
145.0
0.2
bar
-0.88
10.00
-0.94
9.94
-1.00
7.26
1.50
10.00
0.02
MPa
-0.088 1.000 -0.094 0.994 -0.100 0.726 0.150 1.000 0.002
PSI
-1.50
36.25
-1.65
36.10
-1.80
27.20
7.25
36.25
0.05
bar
-0.11
2.50
-0.12
2.49
-0.13
1.88
0.50
2.50
0.01
kPa
-10.5
250.0
-11.5
249.0
-12.5
187.5
50.0
250.0
0.5
ΔP = increments
20
rP1 / rP2
PN2228
PN2227
SP1 / SP2
rP1 / rP2
ASP
AEP
ΔP
min
max
min
max
min
max
min
max
PSI
-0.68
14.50
-0.74
14.44
-0.74
10.88
3.64
14.50
0.02
inH2O
-18.5
401.5
-20.0
400.0
-20.0
301.0 100.5 401.5
0.5
mbar
-46
1000
-50
996
-50
750
250
1000
2
kPa
-4.6
100.0
-5.0
99.6
-5.0
75.0
25.0
100.0
0.2
inH2O
-4.2
100.4
-4.6
100.0
-5.0
75.4
20.2
100.4
0.2
mmWS
-105
2550
-115
2540
-125
1910
510
2550
5
mbar
-10.5
250.0
-11.5
249.0
-12.5
187.5
50.0
250.0
0.5
kPa
-1.05
25.00
-1.15
24.90
-1.25
18.75
5.00
25.00
0.05
UK
ΔP = increments
21
13 Factory setting
Factory setting
SP1
25 % VMR*
rP1
23 % VMR*
OU1
Hno
OU2
I
SP2
75 % VMR*
rP2
73 % VMR*
ASP
0
PN2209: -14,4 PSI
AEP
100 % VMR*
COF
0
dS1
0.0
dr1
0.0
dS2
0.0
dr2
0.0
P-n
PnP
dAP
0.06
dAA
0.10
diS
d2
Uni
PSI / inH2O
User setting
* = the indicated percentage of the final value of the measuring range of the corresponding sensor in PSI / inH2O is set (for PN2209 the percentage of the span).
VMR = final value of the measuring range
More information at www.ifm.com
22
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