IFM PI16 Series User manual

Operating instructions
Electronic pressure sensor
PI16xx
PI18xx
11400146 / 0011 / 2022
GB

PI16xx PI18xx Electronic pressure sensor
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Contents
1 Preliminary note ............................................................. 4
1.1 Symbols used.......................................................... 4
2 Safety instructions............................................................ 5
3 Intended use................................................................ 6
3.1 Application area ........................................................ 6
4 Function ................................................................... 7
4.1 IO-Link ............................................................... 7
4.2 IO-Link properties of the sensor ............................................ 7
4.2.1 Description IO-Link interface........................................... 7
4.2.2 Internal unit temperature.............................................. 8
4.2.3 Counter overpressure events .......................................... 8
4.2.4 Optical localisation .................................................. 8
4.2.5 Event logging ...................................................... 8
4.2.6 Operating hours counter.............................................. 8
4.2.7 Switching cycles counters............................................. 8
4.3 Defined state in case of a fault ............................................. 9
4.4 Operating modes ....................................................... 9
4.4.1 2-wire operation .................................................... 9
4.4.2 3-wire operation .................................................... 9
4.5 Switching function (only for 3-wire operation) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4.6 Analogue output........................................................ 10
4.7 Customer-specific calibration .............................................. 10
5 Installation G1 sealing cone (PI16xx) ............................................. 12
5.1 Use in hygienic areas according to 3-A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5.2 Use in hygienic areas to EHEDG ........................................... 13
6 Installation G1 sealing cone with coupling nut (PI18xx). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
6.1 Use in hygienic areas according to 3-A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
6.2 Use in hygienic areas to EHEDG ........................................... 15
6.3 Ventilation diaphragm.................................................... 15
6.3.1 Function ventilation diaphragm......................................... 15
6.3.2 Orientation filter cover................................................ 16
6.3.3 Replace filter cover.................................................. 16
7 Electrical connection.......................................................... 18
8 Operating and display elements................................................. 19
9 Menu...................................................................... 20
9.1 Menu structure: Main menu................................................ 20
9.2 Explanation of the main menu.............................................. 20
9.3 Menu structure: Level 2 (extended functions) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
9.4 Explanation of menu level 2 ............................................... 21
9.5 Menu structure: level 3 (simulation). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
9.6 Explanation of menu level 3 ............................................... 22
10 Parameter setting............................................................ 23
10.1 Parameter setting in general............................................... 23
10.2 Configure display (optional)................................................ 26
10.3 Set output signals....................................................... 27
10.3.1 Setting of the output function........................................... 27
10.3.2 Set switching limits.................................................. 27
10.3.3 Define switching limits for the window function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
10.3.4 Scale analogue value for OUT2 ........................................ 27
10.4 User settings (optional)................................................... 28
10.4.1 Zero point calibration and adjustment of final value of the measuring range . . . . . . . 28
10.4.2 Define incorrect behaviour of the outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
10.4.3 Set delay time for the switching outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
10.4.4 Set output logic for the switching outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
10.4.5 Set damping for the switching signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Electronic pressure sensor PI16xx PI18xx
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10.4.6 Set damping for the analogue signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
10.5 Service functions........................................................ 29
10.5.1 Read min/max values for the system pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
10.5.2 Reset sensor / parameter............................................. 29
10.6 Simulation function...................................................... 30
10.6.1 Open menu level 3 (simulation)......................................... 30
10.7 Simulation............................................................. 30
10.7.1 Set simulation value ................................................. 30
10.7.2 Set simulation value ................................................. 30
10.7.3 Switch simulation on / off.............................................. 30
10.7.4 Read overload processes............................................. 31
11 Operation .................................................................. 32
11.1 Read set parameters..................................................... 32
11.2 Change the display in the Run mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
12 Troubleshooting ............................................................. 33
12.1 Troubleshooting ........................................................ 33
13 Disposal, repair and return..................................................... 34
14 Factory setting .............................................................. 35

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1 Preliminary note
You will find instructions, technical data, approvals and further information using the QR code on the
unit / packaging or at www.ifm.com.
1.1 Symbols used
Requirement
Instructions
Reaction, result
[...] Designation of keys, buttons or indications
Cross-reference
Important note
Non-compliance may result in malfunction or interference.
Information
Supplementary note

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2 Safety instructions
• The unit described is a subcomponent for integration into a system.
– The system architect is responsible for the safety of the system.
– The system architect undertakes to perform a risk assessment and to create documentation in
accordance with legal and normative requirements to be provided to the operator and user of
the system. This documentation must contain all necessary information and safety instructions
for the operator, the user and, if applicable, for any service personnel authorised by the
architect of the system.
• 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 (Ò Intended use).
• Only use the product for permissible media (Ò Technical data).
• 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 product must be
carried out by qualified personnel authorised by the machine operator.
• Protect units and cables against damage.

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3 Intended use
The device measures and monitors the system pressure or the hydrostatic level and the temperature
in systems.
3.1 Application area
Type of pressure: relative pressure
Information on pressure rating and bursting pressure Ò Data sheet
Avoid static and dynamic overpressure exceeding the indicated pressure rating 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!
Not suitable for systems that have to meet the criteria of E9.2 / 63-04 of the 3-A standard 63-04.
The units are vacuum resistant. Adhere to the specifications in the data sheet!

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4 Function
Measuring cell:
• The system pressure is measured by a ceramic capacitive measuring system.
• The sealing of the ceramic measuring cell is free of elastomers and thus maintenance-free.
• The medium temperature is recorded on the back of the ceramic measuring cell: Accuracy
calculation formula Ò Data sheet.
Signal transmission:
• The unit can be operated in SIO mode (standard input-output ) or in IO-Link mode. The basic
operation mode is SIO. When connected to an IO-Link master, the unit automatically switches to
IO-Link mode. An additional manual switching is not required.
SIO-Mode:
• Analogue signal measured pressure value 4-20 mA (pin 2).
• Switching information (pin 4).
IO-Link mode:
• Measured pressure value
• Measured temperature value
• Exceeding and falling below the limits of the measuring range
• Device status
• Switching information
• Parameter setting
• Device diagnostics (events)
4.1 IO-Link
IO-Link is an internationally standardised IO technology (IEC 61131-9) for communicating with
sensors and actuators.
Further information about IO-Link at: www.io-link.com
IO-Link offers the following advantages:
• Noise-immune transmission of several process values.
• Parameter setting during operation as well as point-to-point at the desk.
• Device diagnostics (events)
• Data storage: Automatic new parameter setting in case of replacement.
• Detection of connected units.
• Freely definable parameters to identify the units in the plant.
Information and documentation on the IO-Link interface at: www.io-link.ifm
4.2 IO-Link properties of the sensor
4.2.1 Description IO-Link interface
A description of the IO-Link interface can be found at www.io-link.ifm

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The sensor provides the internal unit temperature as a readable parameter for diagnostic purposes.
4.2.2 Internal unit temperature
The internal temperature of the sensor can be read via the IO-Link channel. Measuring range:
-25...155°C (-13...311°F), resolution 1°C (1.8°F), precision +/- 5°C (9°F). Information on measuring
range and accuracy Ò Data sheet.
4.2.3 Counter overpressure events
The unit has a counter for overpressure events. The value above which a pressure is considered to be
overpressure can be set.
• HIPC = Counter overpressure events.
HIPC counts how often the limit HIPS has been exceeded.
The limit must be exceeded for at least 0.5 ms.
• HIPS = Threshold overpressure.
The [HIPC] can be reset with the reset command [Reset_HIPC] and the [Back-to-Box]. See: Reset
sensor / parameter (Ò/29)
In case of an interruption of the supply voltage, a maximum of the events of the last 10 minutes
can be lost, as these are summed up in the background and have not yet been permanently
transferred to the memory.
4.2.4 Optical localisation
The sensor can be localised in the plant via the commands [Blinken_An] / [Blinken_Aus]. When the
command is used, the switching status LEDs flash and [IO-L] is displayed.
4.2.5 Event logging
With IO-Link, the sensor has two logging mechanisms:
• Event History (Parameter [Event_History])
• Event Counter (Parameter [Event_Counter])
The last 20 events that occurred are recorded in the event history. As long as no event has occurred,
the value [noEvent] or [0] appears in this list.
The event counter (limited to 232 events) can be used to read how often a specific event has occurred
at the sensor.
The event counter and the event history can be reset using the IO-Link commands
[RESET_EVENT_HISTROY], [RESET_EVENT_COUTER] and [Back-to-Box ].
See: Reset sensor / parameter (Ò/29)
4.2.6 Operating hours counter
In the parameter [operating_hours], the hours are counted during which the sensor was active (cannot
be reset).
4.2.7 Switching cycles counters
The sensor counts the switching cycles at output 1 and output 2 in the [OUT_Counter] parameter and
stores this value every full 60 minutes.
A reset is possible with [Reset_to_zero] or the [Back to Box] reset.
See: Reset sensor / parameter (Ò/29)

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4.3 Defined state in case of a fault
If a fault is detected, the analogue output passes into a defined state ( = 21.5mA).
In case of a fault indication ( = 21.5mA)
uRead parameters via IO-Link or contact the manufacturer.
4.4 Operating modes
The operating mode is defined by the wiring (Ò Electrical connection) and automatically recognised by
the unit.
4.4.1 2-wire operation
OUT2 (pin 2) Analogue signal proportional to pressure 4…20 mA or 20...4 mA
4.4.2 3-wire operation
OUT1 (pin 4) 2 possibilities (automatic changeover)
• switching signal for pressure limit
• Communication via IO-Link
OUT2 (pin 2) 3 possibilities (manual changeover in the menu)
• switching signal for pressure limit
• Analogue signal proportional to pressure 4...20 mA
• Analogue signal proportional to pressure 20...4 mA
4.5 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] (Ò Figure hysteresis function).
• Hysteresis function / normally closed: [OUx] = [Hnc] (Ò Figure hysteresis function).
First the set point (SPx) is set, then the reset point (rPx) with the requested difference.
• Window function / normally open: [OUx] = [Fno] (Ò Figure window function).
• Window function / normally closed: [OUx] = [Fnc](Ò Figure window function)
• The width of the window can be set by means of the difference between SPx and rPx. SPx = upper
value, rPx = lower value.
Fig.1: Hysteresis function
SP
rP
Fig.2: Window function

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P = System pressure
HY = Hysteresis
FE = Window
4.6 Analogue output
The device provides an analogue signal proportional to the pressure. Within the measuring range the
analogue signal is between 4...20 mA. The measuring range is scalable:
• [ASP2] defines at which measured value the output signal is 4 mA.
• [AEP2] defines at which measured value the output signal is 20 mA.
Minimum distance between [ ASP2] and [ AEP2 ] = 20 % of the final value of the measuring
range.
If the measured value is outside the measuring range or in the event of an internal error, the current
signal indicated in the following figure is provided. The analogue signal in case of an error is
adjustable:
• [FOU] = On defines that the analogue signal goes to the maximum value (21.5 mA) in case of an
error.
MEWMAW AEPASP
P -1,25 0 100 103,13
4
3,8
20
20,5
21,5
[mA]
FOU=On
1
2
4
UL OL
3
[% MEW]
Fig.3: Output characteristics of the analogue output to Namur
1: Analogue signal
2: Measured value (in configured unit)
3: Measuring range (factory setting)
4: Scaled measuring range
P: Pressure
MAW: Initial value of the measuring range with non-scaled measuring range.
MEW: Final value of the measuring range with non-scaled measuring range
ASP: Analogue start point with scaled measuring range
AEP: Analogue end point with scaled measuring range
UL: Below the display range
OL: Above the display range
FOU: Output behaviour in case of an error
4.7 Customer-specific calibration
The customer-specific calibration changes the curve of measured values compared to the real
measured values (zero-point calibration and correction of gradient). Keep the following order:
uCarry out zero calibration [coF] in the range -5%....+5% of final value of the measuring range
(VMR).

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uCarry out calibration factor [CGA] in the range -5%....+5% of final value of the measuring range
(VMR). The previous zero point calibration remains.
Example: Change zero point [coF]
105 % MEW
100 % MEW
95 % MEW
MEW D
AV1
V0
V2
A: Output signal
D: Pressure
MEW: Final value of the measuring range
V0: Curve of measured values at factory setting
V1,
V2:
Changed curve of measured values
Example: Change in gradient [CGA]
105 % MEW
100 % MEW
95 % MEW
MEW D
AV1
V0
V2
A: Output signal
D: Pressure
MEW: Final value of the measuring range
V0: Curve of measured values at factory setting
V1,
V2:
Changed curve of measured values
The change in the gradient is indicated in per cent.
uEnter analogue start [ASP] and [AEP] manually or via teach function.
If the gradient [CGA] and the offset [coF] are changed, the [ASP] and the [AEP] are influenced.

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5 Installation G1 sealing cone (PI16xx)
Before installing and removing the unit: Make sure that no pressure is applied to the system and
there is no medium in the pipe or tank.
uNote dangers related to machine / medium temperatures.
Information about available adapters at: www.ifm.com
uObserve the instructions of the adapter.
uUse a lubricating paste which is suitable and approved for the application.
uInsert the sensor with the process adapter into the process connection.
uTighten it using a spanner: Tightening torque 20 Nm.
The process adapter can be adapted to different process connections.
Options are as follows:
1: Installation in process adapter with sealing ring
uInsert the sealing ring into the groove of the adapter before mounting the sensor.
uUse a suitable O-ring approved for the application in hygienic applications.
Use of welding adapters:
uDuring the welding process, make sure that the adapter is not deformed and that the sealing area
is not affected.
uObserve the instructions and data sheet of the adapter used.
uUse brass mandrel E30435 for optimised heat conduction.
When reworking the weld seam:
uLeave out or protect the sealing area.
2: Installation in process adapter with metallic sealing edge
An elastomer-free sealing in chemical applications is possible with a metal-to-metal seal.
uFor hygienic applications, avoid repeated installation to avoid compromising the sealing effect.
A guarantee for a long-term stable sealing effect only exists with one-time installation.
Use of welding adapters:
uDuring the welding process, make sure that the adapter is not deformed and that the sealing edge
is not affected.
uObserve the instructions and data sheet of the adapter used.
uUse brass mandrel E30435 for optimised heat conduction.
When reworking the weld seam:
uLeave out or protect the sealing edge.
3: Installation to G1 flange / G1 socket
The sensor is sealed with the sealing ring at the back of the process connection.
uThe sealing area on the flange/socket must be flush with the tapped hole and have a surface
characteristic of min. Rz = 6.3 (observe DINENISO1179-1).

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5.1 Use in hygienic areas according to 3-A
The following applies to units with 3-A certification:
uOnly use adapters with A-3 certification for the process
connection.
uDo not install the unit at the lowest point of the pipe or tank
(position 5) so that the medium can run off the area of the
measuring element.
5.2 Use in hygienic areas to EHEDG
Ensure that the installation of the unit in the system complies with EHEDG guidelines. See documents
of the EHEDG work group.

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6 Installation G1 sealing cone with coupling nut (PI18xx)
Before installing and removing the unit: Make sure that no pressure is applied to the system and
there is no medium in the pipe or tank.
uNote dangers related to machine / medium temperatures.
The unit must only be installed in an ifm process connection with G1 sealing cone designed for
this.
Information about available adapters at: www.ifm.com
uObserve the instructions of the adapter.
uEnsure that the sensor is pressed against the metallic stop in the front area in contact with the
product by the coupling nut. This must be independent of whether an adapter with a metallic
sealing edge or an O-ring upstream of the stop (as a media-side seal) is used.
wIf the unit is installed in a 1“ thread without a metallic end stop, this will lead to seal failure.
The sensor series PIx7xx, PMx7xx and PI26xx are available for installation in 1" threaded
sleeves with a suitably designed sensing face.
2
3
4
1
34
46
1: Sensor
2: Threaded sleeve
3: Process connection
4: O-ring (if used)
uLightly grease the thread of the threaded sleeve (2) using a lubricating paste which is suitable and
approved for the use case.
uInsert the sensor (1) into the process connection (3).
uSlide the threaded sleeve (2) to the internal thread of the process connection (3) and screw it in
loosely.
uAlign the sensor (1) and tighten the threaded sleeve (2) with a spanner, holding the sensor (1) in its
alignment. Tightening torque 20 Nm.
The process adapter can be adapted to different process connections.
Options are as follows:
1: Installation in process adapter with sealing ring
uInsert the sealing ring into the groove of the adapter before mounting the sensor.
uUse a suitable O-ring approved for the application in hygienic applications.
Use of welding adapters:
uDuring the welding process, make sure that the adapter is not deformed and that the sealing area
is not affected.
uObserve the instructions and data sheet of the adapter used.
uUse brass mandrel E30435 for optimised heat conduction.
When reworking the weld seam:
uLeave out or protect the sealing area.
2: Installation in process adapter with metallic sealing edge

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An elastomer-free seal in chemical applications is possible with a metal-to-metal seal.
uFor hygienic applications, avoid repeated installation to avoid compromising the sealing effect.
A guarantee for a long-term stable sealing effect only exists with one-time installation.
Use of welding adapters:
uDuring the welding process, make sure that the adapter is not deformed and that the sealing edge
is not affected.
uObserve the instructions and data sheet of the adapter used.
uUse brass mandrel E30435 for optimised heat conduction.
When reworking the weld seam:
uLeave out or protect the sealing edge.
6.1 Use in hygienic areas according to 3-A
The following applies to units with 3-A certification:
uOnly use adapters with A-3 certification for the process
connection.
uDo not install the unit at the lowest point of the pipe or tank
(position 5) so that the medium can run off the area of the
measuring element.
6.2 Use in hygienic areas to EHEDG
Ensure that the installation of the unit in the system complies with EHEDG guidelines. See documents
of the EHEDG work group.
6.3 Ventilation diaphragm
The sensor with a final value of the measuring range of 100 bar does not have a ventilation
diaphragm.
6.3.1 Function ventilation diaphragm
The ventilation diaphragm enables the relative pressure measurement since barometric and
temperature-dependent pressure fluctuations between the measuring cell and the environment are
compensated for.
The ventilation diaphragm is protected against damage by a screwed filter cover with circumferential
ports.
For a correct functioning of the ventilation diaphragm please take the following into account:
uRemove soiling and cleaning agents immediately using plenty of lime-deficient splash water.
If the sensor is in a cooling stage:
uAvoid contact of the ventilation diaphragm with liquids to avoid negative pressure in the
measuring system (resulting in a slightly falsified measured value) and additional strain on
the diaphragm.

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6.3.2 Orientation filter cover
Select the installation situation so that the filter cover is horizontal and the condensate can drain off
due to gravity.
3
1
2
uIdeal orientation (1):
The filter cover is in a horizontal position.
wThe ventilation diaphragm (2) in the filter cover is in a vertical
position.
uMaximum inclination of the filter cover: 30° (3)
6.3.3 Replace filter cover
(1) Exchange of the filter cover incl. ventilation diaphragm (E30483).
In difficult environmental conditions or an installation situation that does not correspond to the ideal
alignment (1), the following accessories can be used to protect the ventilation diaphragm:
(2) Replace the filter cover with a closed version (E30148)*.
(3) Replace the filter cover with a version with a tube fitting and a vent tube that ends in a protected and dry area (E30139).
(4) Set of accessories (E30467) with integrated replacement diaphragm (ventilation diaphragm). Recommended for chemically
demanding applications in external cleaning. Function: (Ò Installation instructions E30467).
2
3
4
1
uAvoid soiling and moisture during the exchange.
uClean the thread carefully and without residues.
uDo not damage the adhesive surface for the diaphragm on the sensor.
uObserve the orientation of the filter cover (Ò Installation instructions E30139 / E30467).
*When using the closed filter cover, there is no more pressure compensation of the measuring
cell. This results in measurement deviations caused by:
• Fluctuations of the atmospheric pressure.

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• Fluctuations in the internal pressure of the unit with temperature changes.

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7 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.
The circuit of the unit is isolated from touchable parts by functional insulation.
Supply voltage SELV, PELV according to the technical data sheet.
uDisconnect power.
uConnect the unit as follows:
43
2 1
1 BN
2 WH OUT2
L+
1
L
1 BN
2 WH
4 BK
3 BU
OUT1
OUT2
L+
2
1: 2-wire operation
2: 3-wire operation
Pin Core colour
1: BN Brown
2: WH White
3: BU Blue
4: BK Black
OUT1: Switching output or analogue output or IO-Link
OUT2: Switching output or analogue output
Colours to DIN EN 60947-5-2
Circuit examples:
1
L
1
BN
2
WH
4
BK
3
BU
L+
2
L
1
BN
2
WH
4
BK
3
BU
L+
4
L
1
BN
4
BK
2
WH
3
BU
L+
3
L
1
BN
2
WH
4
BK
3
BU
L+
1: 2 x positive switching
2: 2 x negative switching
3: 1 x positive switching / 1 x analogue
4: 1 x negative switching / 1 x analogue

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8 Operating and display elements
321
9 10
4 5 6 7 8
12
11
1 to 8: Indicator LEDs
LED 1 - 6 Unit of measurement of the process value pressure (assignment is device-specific).
LED 7 Switching status OUT2 (on if output 2 is switched).
LED 8 Switching status OUT1 (on if output 1 is switched).
9: (Enter) button
Selection of the parameters and acknowledgement of the parameter values
10 to 11: Arrow keys up [▲] and down [▼]
Setting of the parameter values (scrolling by holding pressed, incrementally by pressing once).
Cancellation of input or return to menu: Press [▲] + [▼] simultaneously.
12: Alphanumeric display, 4 digits
Display: Currently measured system pressure
Display: Parameters and parameter values

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9 Menu
9.1 Menu structure: Main menu
1
RUN
rP1
SP2
rP2
tcoF ....
tASP ....
tAEP ....
FH1
FL1
FH2
FL2
ASP2
AEP2
EF
E
E
E
E
E
E
E
E
E
E
E
E
E
E
E
E
E
E
E
E
E
E
E
E
E
E
E
E
SP1 1000 1000
900 900
1000 1000
900 900 1000
0
9.05
1
1: Change to menu level 2 (extended functions).
Menu items highlighted in grey are active depending on the configuration of the output.
9.2 Explanation of the main menu
SPx / rPx* Hysteresis function: upper / lower limit value for system pressure at which OUTx switches.
Requirement: OUTx setting is [Hno] or [Hnc].
FHx / FLx* Window function: upper / lower limit value for system pressure at which OUTx switches.
Requirement: OUTx setting is [Fno] or [Fnc].
ASP2 Analogue start point for system pressure: measured value at which 4 mA (20 mA) are provided. Require-
ment: OUT2 setting is [I] or ([InEG]).
AEP2 Analogue end point for system pressure: measured value at which 20 mA (4 mA) are provided. Require-
ment: OUT2 setting is [I] or ([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]).
EF Extended functions / opening of menu level 2.
* menu items not active in 2-wire operation