IFM PI28 Series User manual

Operating instructions
Electronic pressure sensor
PI28xx
80260760/ 00 03 / 2019
UK

2
Contents
1 Preliminary note...................................................................................................4
1.1 Symbols used ................................................................................................4
2 Safety instructions ...............................................................................................4
3 Functions and features ........................................................................................5
3.1 Applications ...................................................................................................5
4 Function...............................................................................................................6
4.1 Operating modes ...........................................................................................6
4.1.1 2-wire operation....................................................................................6
4.1.2 3-wire operation....................................................................................6
4.2 Switching function (only for 3-wire operation)................................................7
4.3 Analogue function ..........................................................................................7
4.4 Customer-specific calibration ........................................................................8
5 Installation..........................................................................................................10
5.1 Filter cover................................................................................................... 11
6 Electrical connection.......................................................................................... 11
6.1 Connection for 2-wire operation ..................................................................12
6.2 Connection for 3-wire operation ..................................................................12
7 Operating and display elements ........................................................................13
8 Menu..................................................................................................................14
8.1 Menu structure: main menu.........................................................................14
8.2 Explanation of the main menu .....................................................................15
8.3 Menu structure: level 2 (extended functions)...............................................16
8.4 Explanation of the menu level 2 ..................................................................17
8.5 Menu structure: level 3 (simulation).............................................................18
8.6 Explanation of the menu level 3 ..................................................................19
9 Parameter setting ..............................................................................................20
9.1 Parameter setting in general .......................................................................20
9.2 Configure display (optional).........................................................................22
9.3 Set output signals ........................................................................................22
9.3.1 Set output functions............................................................................22
9.3.2 Set switching limits .............................................................................23
9.3.3 Scale analogue value for OUT2 .........................................................23
9.4 User settings (optional)................................................................................24
9.4.1 Carry out zero point calibration ..........................................................24

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9.4.2 Set output status in fault condition......................................................24
9.4.3 Set delay for the switching outputs.....................................................25
9.4.4 Set output logic for the switching outputs ...........................................25
9.4.5 Set damping for the switching signal ..................................................25
9.4.6 Set damping for the analogue signal ..................................................25
9.4.7 Calibrate curve of measured values ...................................................25
9.5 Service functions .........................................................................................26
9.5.1 Read min/max values for the system pressure ..................................26
9.5.2 Reset all parameters to factory setting ...............................................26
9.6 Simulation function ......................................................................................26
9.6.1 Open menu level 3 (simulation)..........................................................26
9.6.2 Set simulation value ...........................................................................27
9.6.3 Set time for simulation ........................................................................27
9.6.4 Start simulation...................................................................................27
10 Operation.........................................................................................................28
10.1 Read the set parameters ...........................................................................28
10.2 Change the display in the Run mode .......................................................28
10.3 Self-diagnosis / error indications ...............................................................28
10.4 Setting ranges ...........................................................................................31
11 Factory setting .................................................................................................33

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1 Preliminary note
1.1 Symbols used
►Instructions
> Reaction, result
[…] Designation of keys, buttons or indications
→Cross-reference
Important note
Non-compliance may result in malfunction or interference.
Information
Supplementary note.
2 Safety instructions
• Read this document before setting up the product and keep it during the entire
service life.
• The product must be suitable for the corresponding applications and
environmental conditions without any restrictions.
• Only use the product for its intended purpose (→ 3 Functions and features).
• If the operating instructions or the technical data are not adhered to, personal
injury and/or damage to property may occur.
• The manufacturer assumes no liability or warranty for any consequences
caused by tampering with the product or incorrect use by the operator.
• Installation, electrical connection, set-up, operation and maintenance of the unit
must be carried out by qualified personnel authorised by the machine operator.
• Protect units and cables against damage.

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3 Functions and features
The unit measures and monitors the system pressure in a plant.
3.1 Applications
Type of pressure: relative pressure
Order no. Measuring range
Permissible
overload
pressure
Bursting
pressure
bar psi bar psi bar psi
PI2893 -1...25 -14.4...362.7 100 1450 350 5075
PI2814 -1...16 -14.6...232 75 1085 250 3625
PI2894 -1...10 -14.5...145 50 725 150 2175
PI2815 -1...6 -14.5...87 30 435 100 1450
PI2895 -1...4 -14.5...58 30 435 100 1450
PI2896 -0.124...2.5 -1.8...36.27 20 290 50 725
PI2899 -1...1 -14.5...14.5 10 145 30 435
PI2897 -0.05...1 -0.73...14.5 10 145 30 435
mbar psi mbar psi mbar psi
PI2817 -100...1600 -1.46...23.2 15000 215 40000 580
mbar inH2O bar inH2O bar inH2O
PI2898 -12.4...250 -5.0..100.4 6 2400 30 12044
PI2889 -5...100 -2.00...40.16 4 1606 30 12044
Avoid static and dynamic overpressure exceeding the specified overload
pressure 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
may be destroyed. ATTENTION: Risk of injury!
The units are vacuum resistant.

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4 Function
• The unit displays the current system pressure.
• It generates output signals according to the operating mode and the parameter
setting.
• It moreover provides the process data via IO-Link.
• The unit is laid out for fully bidirectional communication. So, the following
options are possible:
- Remote display: reading and display of the current system pressure.
- Remote parameter setting: reading and changing the current parameter
setting.
- Using 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.
Device-specific parameter lists for IO-Link parameter setting are available at:
www.ifm.com.
4.1 Operating modes
The operating mode is defined by the wiring (→ 6 Electrical connection) and
automatically recognised.
4.1.1 2-wire operation
OUT2 (pin 2) Analogue signal proportional to pressure 4…20 mA or 20...4 mA
4.1.2 3-wire operation
OUT1 (pin 4) • Switching signal for system pressure limit value
• Communication via IO-Link
OUT2 (pin 2)
3 options:
• Switching signal for system pressure limit value
• Analogue signal proportional to pressure 4...20 mA
• Analogue signal proportional to pressure 20...4 mA

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4.2 Switching function (only for 3-wire operation)
OUTx changes its switching status 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] (→
First the set point (SPx) is set, then the reset point (rPx) with the requested
difference.
• Window function / normally open: [OUx] = [Fno] (→ fig. 2).
• Window function / normally closed: [OUx] = [Fnc] (→
The width of the window can be set by means of the difference between SPx
and rPx. SPx = upper value, rPx = lower value.

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1 2
P = system pressure; HY = hysteresis; FE = window
4.3 Analogue function
The analogue output can be configured.
• [OU2] defines whether the set measuring range is provided as 4...20 mA
([OU2] = [I]) or as 20...4 mA ([OU2] = [InEG]).
Scaling can be set by means of the teaching process or by entering a value for the
ASP and AEP parameters.
• Teaching the analogue start point [tASP] or setting the parameter [ASP] defines
at which measured value the analogue signal is 4 mA (20 mA at [InEG]).
• Teaching the analogue end point [tAEP] or setting the parameter [AEP] defines
at which measured value the output signal is 20 mA (4 mA at [InEG]).
Minimum distance between [ASP] and [AEP] = 25 % of the final value of the
measuring range (turn-down 1:4); for PI2899: 25 % of the measuring span.

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Factory setting Measuring range scaled

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 
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
P = system pressure , MAW = initial value of the measuring range, MEW = final value of
the measuring range
1
: [OU2] = [I];
2
: [OU2] = [InEG]
In the set measuring range the output signal is between 4 and 20 mA ([OU2] = [I])
or between 20 and 4 mA ([OU2] = [InEG]).
It is also indicated:
• System pressure above the measuring range:
- Output signal > 20 mA at [OU2] = [I].
- Output signal 4 to 3.8 mA at [OU2] = [InEG].
• System pressure below the measuring range:
- Output signal 4 to 3.8 mA at [OU2] = [I].
- Output signal > 20 mA at [OU2] = [InEG].
4.4 Customer-specific calibration
The customer-specific calibration changes the curve of measured values
compared to the real measured values (shifting / change of the gradient;
→ 9.4.6 [CAL]).
• Two calibration points can be defined (CP1, CP2). The two points are
independent of each other.
• The two calibration points must be within the scaled measuring range
(→ 4.3 ).
• The zero point calibration [COF] influences the calibration of the curve of
measured values. Recommendation: Set [COF] to 0 (→ 9.4.1 [COF]), then
calibrate the measured value curve.
After a change the calibration can be reset to factory setting (→ 9.5.2 [rES]).

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
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• P = measured pressure;
P‘ = modified measured value
• CP1 = calibration point 1;
CP1‘ = modified measured value for
CP1
• CP2 = calibration point 2;
• 1 = curve of measured values at
factory setting
• 2 = curve of measured values after
calibration
 
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• P = measured pressure;
P‘ = modified measured value
• CP1 = calibration point 1;
CP2 = calibration point 2;
CP2‘ = modified measured value for
CP2
• 1 = curve of measured values at
factory setting
• 2 = curve of measured values after
calibration
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• P = measured pressure;
P‘ = modified measured value
• CP1 = calibration point 1;
CP1‘ = modified measured value for
CP1
• CP2 = calibration point 2;
CP2‘ = modified measured value for
CP2
• 1 = curve of measured values at
factory setting
• 2 = curve of measured values after
calibration

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5 Installation
Before installing and removing the unit: Make sure that no pressure is
applied to the system. Please consider when the system pressure is
displayed in % of the span: "0" does not mean that no pressure is applied
to the system!
The unit must only be installed in a process connection for G1 sealing
cones (e.g. ifm welding adapter, order no. E30013).
If the unit is installed in a 1“ thread without a G1 sealing cone, this will lead
to seal failure. Please use the PI27xx series in these applications.
A guarantee for a long-term stable fitting of the metallic sealing is only valid
for once-only mounting.
Alternatively, adapters with O-ring seal are available that can be used for
frequent inspections.
Installation in a process connection for G1 sealing cones
►Slightly grease the thread of
the threaded sleeve (B) using a
lubricating paste which is suitable
and approved for the application.
►Insert the unit (A) into the process
connection (C), push the threaded
sleeve towards the internal thread
of the process connection and
lightly screw it in.
►Orientate the unit, tighten the
threaded sleeve with a spanner
and ensure that the unit is correctly
oriented while doing so.
Tightening torque 20 Nm.
46
34
A
B
C
Use in hygienic areas to EHEDG
►Make sure that the sensor is integrated into the system in accordance with
EHEDG.
See documents of the EHEDG work group.

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5.1 Filter cover
For particularly rough operating conditions, the sensor protection can be improved
by using ifm accessories.
• The filter cover can be replaced with a cover cap with a tube fitting and a vent
tube that ends in a protected and dry area.
• The filter cover can be replaced with a closed cover cap.
When the closed cover cap is used, the measurement may deviate due to
fluctuations of the atmospheric pressure and pressure fluctuations inside
the unit (because there is no pressure compensation of the measuring cell
to the environment) (Δ 10 K ≤ 30 mbar).
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 according to EN 50178, SELV, PELV.
►Disconnect power.
►Connect the unit as follows:

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6.1 Connection for 2-wire operation
Core colours
Original Scale Drawing (MTD)
EPS Source
Frame Size: 15 mm x 15 mm
PIN_0180
2 1
2 1
L+
BN1
WH2 OUT
BN brown
WH white
OUT: analogue output 4...20 mA
Colours to DIN EN 60947-5-2
6.2 Connection for 3-wire operation
Core colours
43
2 1 BN
WH
BK
BU
4
1
3
2OUT2
L+
L
OUT1
BK black
BN brown
BU blue
WH white
OUT1: switching output or IO-Link
OUT2: switching outputs or analogue output
Colours to DIN EN 60947-5-2
Wiring example
2 x positive switching 2 x negative switching
L
L+
3
4
2
1
BU
BK
WH
BN
2: OUT2
4: OUT1 L
L+
3
4
2
1
BU
BK
WH
BN
2: OUT2
4: OUT1
1 x positive switching / 1 x analogue 1 x negative switching / 1 x analogue
L
L+
3
4
2
1
BU
BK
WH
BN
2: OUT2
4: OUT1 L
L+
3
4
2
1
BU
BK
WH
BN
2: OUT2
4: OUT1

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If analogue signal current (I) is selected in the menu under OU2 and the
output is not connected (resistor = infinite), the error message W532 is
displayed in intervals. The measuring result is not affected by this.
►Alternatively: change OU2 to switching output.
7 Operating and display elements
10
9
11
Mode/Enter Set
1 2 3 4 5 6 78
1 to 8: Indicator LEDs
- LED 1 to LED 5 = system pressure in the specified unit of measurement.
- LED 6 = system pressure in % of the scaling of the analogue output (range ASP to AEP)
if [OU2] is configured as analogue output.
System pressure in % of the final value of the measuring range if [OU2] is configured as
switching output.
- LED 7 = switching status OUT2 (lights when output 2 is switched).
- LED 8 = switching status OUT1 (lights if output 1 is switched).
9: Alphanumeric display, 4 digits
- Display of the current system pressure.
- Indication of the parameters and parameter values.
10: Set button
- Setting of the parameter values (scrolling by holding pressed; incrementally by pressing
once).
11: Mode/Enter button
- Selection of the parameters and acknowledgement of the parameter values.

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8 Menu
8.1 Menu structure: main menu
RUN
S
M
M
S
M
M
S
M
M
S
M
S
M
S
M
M
1
M
M
S
M
M
S
M
M
M
S
M
M
S
M
M
S
M
1: Change to menu level 2 (extended functions)
Menu items highlighted grey ( SP1 ) are not active in 2-wire operation.

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8.2 Explanation of the main menu
SP1/rP1* Upper / lower limit value for system pressure at which OUT1 switches.
OU1* Output function for OUT1:
• Switching signal for the pressure limit values: hysteresis function [H ..] or
window function [F ..], either normally open [. no] or normally closed [. nc].
OU2 Output function for OUT2:
• Switching signal for the pressure limit values: hysteresis function [H ..] or
window function [F ..], either normally open [. no] or normally closed [. nc];
(only available for 3-wire operation).
• Analogue signal for the current system pressure: 4...20 mA [I], 20...4 mA
[InEG].
tCOF Teach zero-point calibration.
tASP Teach analogue start point for system pressure: set measured value at which
4 mA is provided (20 mA if [OU2] = [InEG]).
tAEP Teach analogue end point for system pressure: set measured value at which
20 mA is provided (4 mA if [OU2] = [InEG]).
SP2/rP2* Upper / lower limit value for system pressure at which OUT2 switches.
EF Extended functions / opening of menu level 2.
* menu items not active in 2-wire operation

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8.3 Menu structure: level 2 (extended functions)
M
M
S
M
M
S
M
M
S
M
M
S
M
M
S
M
S
M
M
S
M
M
S
M
M
S
1
1
M
M
M
S
M
M
S
M
S
M
S
M
S
M
S
M
M
M
M
M
M
S
M
M
S
M
M
S
M
M
M
S
M
S
M
S
2
S
M
1: Change to the main menu; 2: Change to menu level 3 (simulation).
Menu items highlighted grey ( ASP ) are not active in 2-wire operation.

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8.4 Explanation of the menu level 2
Uni Standard unit of measurement for system pressure.
SELd
Display mode:
• Pressure in the unit set in [Uni].
• Pressure in % of the set scaling of the analogue output.
ASP Analogue start point for system pressure: measured value at which 4 mA is
provided (20 mA if [OU2] = [InEG]).
AEP Analogue end point for system pressure: measured value at which 20 mA is
provided (4 mA if [OU2] = [InEG]).
HI Maximum value memory for system pressure.
LO Minimum value memory for system pressure.
COF Zero-point calibration.
dS1* Switch-on delay for OUT1.
dr1* Switch-off delay for OUT1.
dS2* Switch-on delay for OUT2; only active if [OU2] = [Hnc], [Hno], [Fnc] or [Fno].
dr2* Switch-off delay for OUT2; only active if [OU2] = [Hnc], [Hno], [Fnc] or [Fno].
FOU1* Status of output 1 in case of an internal fault.
FOU2 Status of output 2 in case of an internal fault.
P-n* Switching logic for the outputs: pnp or npn.
dAP Damping for switching outputs and display.
dAA Damping for analogue output (OUT2), also has effect on the IO-Link process
value.
diS Update rate and orientation of the display.
CAL Calibration function (setting the curve of measured values).
CP1 Calibration point 1
CP2 Calibration point 2
SIM Change to menu level 3 (simulation).
rES Restore factory setting.
* menu items not active in 2-wire operation

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8.5 Menu structure: level 3 (simulation)
For setting SEL = OU
2
2
M
S
M
M
S
M
M
S
M
M
S
M
S
M
2 s
1...60 min
M
For setting SEL = Proc
2
2
M
S
M
M
S
M
M
S
M
S
M
2 s
1...60 min
M
2: Change to menu level 2 (extended functions)
Menu items highlighted grey ( S.OU1 ) are not active in 2-wire operation.

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8.6 Explanation of the menu level 3
For setting SEL = OU
SEL Status to be simulated:
• Output functions [OU].
S.OU1* Simulation values for OUT1; only active for 3-wire operation and if [SEL] =
[OU].
• Output inactive [OPEN] or output active [CLOS].
S.OU2 Simulation values for OUT2; only active if [SEL] = [OU].
• For 3-wire operation and if OUT2 has been configured as switching output:
output inactive [OPEN] or active [CLOS].
• If OUT2 is set as analogue output: analogue signal between 3.6 and 21.1
mA (depending on the set value → 9.6.2).
S.TIM Time for the simulation process in minutes.
S.ON
Start of the simulation process.
During the simulation process the display alternately shows [SIM] and the
current operation indication (→ 9.6.4).
If the simulation process is aborted (briefly press [Mode/Enter] or [Set])
[S.OFF] is indicated for 2 s, then [SEL] is active again.
* menu item not active in 2-wire operation
For setting SEL = Proc
SEL Status to be simulated:
• Process value [Proc].
S.Pr Simulation of a process value; only active if [SEL] = [Proc].
• Any value between initial value of the measuring range and final value of
the measuring range.
S.TIM Time for the simulation process in minutes.
S.ON
Start of the simulation process.
During the simulation process the display alternately shows [SIM] and the
current operation indication (→ 9.6.4).
If the simulation process is aborted (briefly press [Mode/Enter] or [Set])
[S.OFF] is indicated for 2 s, then [SEL] is active again.

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9 Parameter setting
During parameter setting the unit remains in the operating mode. It continues
to monitor with the existing parameters until the parameter setting has been
completed.
Exemptions: Changes to the parameters COF (→ 9.4.1), CP1 and CP2 (→ 9.4.7) take effect
immediately.
9.1 Parameter setting in general
3 steps must be taken for each parameter setting:
1Select parameter
►Press [Mode/Enter] until the
requested parameter is displayed.
If the main menu is protected by an
access code, [Cod0] flashes in the
display.
►Press and hold [Set] until the valid
code no. is displayed.
►Briefly press [Mode/Enter].
When delivered by ifm electronic: no
access restriction.
 
2Set parameter value
►Press and hold [Set].
> Current setting value of the
parameter flashes for 5 s.
> After 5 s: setting value is changed:
incrementally by pressing the button
once or continuously by keeping the
button pressed.
 
Numerical values are incremented continuously. For reducing the value: let the
display move to the maximum setting value. Then the cycle starts again at the
minimum setting value.
3Acknowledge parameter value
►Briefly press [Mode/Enter].
> The parameter is displayed again.
The new setting value is saved.
 
Set other parameters
►Start again with step 1.
Finish 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.