IFM PI299 Series User manual

Operating instructions
Electronic pressure sensor
PI299x UK
11426178 / 00 07 / 2016

2
Contents
1 Preliminary note���������������������������������������������������������������������������������������������������3
1�1 Symbols used ������������������������������������������������������������������������������������������������3
2 Safety instructions �����������������������������������������������������������������������������������������������3
3 Functions and features ����������������������������������������������������������������������������������������4
3�1 Applications ���������������������������������������������������������������������������������������������������4
4 Function���������������������������������������������������������������������������������������������������������������4
4�1 Processing of the measured signals��������������������������������������������������������������4
4�2 Pressure monitoring / switching function �������������������������������������������������������5
4�3 Pressure monitoring/ analogue function ��������������������������������������������������������6
4�4 Diagnostic function ����������������������������������������������������������������������������������������8
5 Installation������������������������������������������������������������������������������������������������������������8
6 Electrical connection������������������������������������������������������������������������������������������10
7 Operating and display elements ������������������������������������������������������������������������ 11
8 Menu������������������������������������������������������������������������������������������������������������������12
8�1 Menu structure���������������������������������������������������������������������������������������������12
8�2 Menu explanation ���������������������������������������������������������������������������������������13
9 Parameter setting ����������������������������������������������������������������������������������������������14
9�1 Parameter setting general ���������������������������������������������������������������������������14
9�2 Configuring the display (optional) ����������������������������������������������������������������16
9�3 Setting the output signal ������������������������������������������������������������������������������16
9�3�1 Setting the output function������������������������������������������������������������������16
9�3�2 Setting the switching limits �����������������������������������������������������������������17
9�3�3 Scaling the analogue value ����������������������������������������������������������������17
9�4 User settings (optional)��������������������������������������������������������������������������������18
9�4�1 Zero-point calibration��������������������������������������������������������������������������18
9�4�2 Setting the delay time for OUT1 ���������������������������������������������������������18
9�4�3 Setting the output polarity for OUT1 ���������������������������������������������������18
9�4�4 Setting the damping for the switching signal ��������������������������������������18
9�4�5 Setting the damping for the analogue signal ��������������������������������������18
9�5 Service functions �����������������������������������������������������������������������������������������19
9�5�1 Reading the min�/max� values for the system pressure����������������������19
9�5�2 Reset all parameters to the factory setting �����������������������������������������19

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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�
2 Safety instructions
• The device described is a subcomponent for integration into a system�
- The manufacturer is responsible for the safety of the system�
- The system manufacturer undertakes to perform a risk assessment and to
create a 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
manufacturer 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 (→ Functions and features).
• Only use the product for permissible media (→ Technical data).
• If the operating instructions or the technical data are not adhered to, personal
injury and/or damage to property may occur�
10 Operation���������������������������������������������������������������������������������������������������������19
10�1 Read the set parameter values �����������������������������������������������������������������19
10�2 Fault indication ������������������������������������������������������������������������������������������19
10�3 Cleaning of the filter cover�������������������������������������������������������������������������20
11 Factory setting �������������������������������������������������������������������������������������������������21

4
• 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, programming, configuration, operation
and maintenance of the product must be carried out by personnel qualified and
authorised for the respective activity�
• Protect units and cables against damage�
3 Functions and features
The pressure sensor detects the system pressure of machines and installations�
3.1 Applications
Type of pressure: relative pressure
Information on pressure rating and bursting pressure → data sheet.
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!
4 Function
4.1 Processing of the measured signals
• The unit displays the current system pressure�
• It generates 2 output signals according to the parameter setting�
OUT1
2 selection options
• switching signal for pressure limit values�
• diagnostic signal (in case of a fault output 1 becomes inactive)�
OUT2
4 selection options
• analogue signal 4���20 mA
• analogue signal 20���4 mA
• analogue signal 0���10 V
• analogue signal 10���0 V

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4.2 Pressure monitoring / switching function
OUT1 changes its switching state if it is above or below the set switching limits
(SP1, rP1)� The following switching functions can be selected:
• Hysteresis function / normally open: [OU1] = [Hno] (→ fig. 1).
• Hysteresis function / normally closed: [OU1] = [Hnc] (→ fig. 1).
First the set point (SP1) is set, then the reset point (rP1) at the requested
distance�
• Window function / normally open: [OU1] = [Fno] (→ fig. 2).
• Window function / normally closed: [OU1] = [Fnc] (→ fig. 2).
The width of the window can be set by means of the distance between SP1
and rP1� SP1 = maximum value, rP1 = minimum value�
1 2
P = system pressure; HY = hysteresis; FE = window

6
4.3 Pressure monitoring/ analogue function
The analogue signal can be set�
• [OU2] defines whether the set measuring range is provided as a 4���20 mA
signal ([OU2] = [I]), a 20���4 mA signal ([OU2] = [InEG]), a 0���10 V signal ([OU2]
= [U]) or a 10���0 V signal ([OU2] = [UnEG])�
Scaling can also be set by means of the teaching process or by entering a value
for the ASP and AEP parameters�
• By teaching the analogue start point (tASP) or setting the parameter ASP you
define the measured value at which the output signal is 4 mA / 0 V (20 mA /
10 V at [InEG] / [UnEG])�
• By teaching the analogue end point (tAEP) or setting the parameter AEP you
define the measured value at which the output signal is 20 mA / 10 V (4 mA /
0 V at [InEG] / [UnEG])�
Minimum distance between [ASP] and [AEP] = 25 % of the final value of the
measuring range (turn down 1:4)�
Current output
Factory setting Measuring range scaled
P = system pressure, MAW = initial value of the measuring range, MEW = final value of
the measuring range
1
: [OU2] = [I];
2
: [OU2] = [InEG]
The output signal is between 4 and 20 mA ([OU2] = [I]) or between 20 and 4 mA
([OU2] = [InEG])� It is also indicated:

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• System pressure above the measuring range:
- output signal > 20 mA if [OU2] = [I]�
- output signal between 4 and 3�8 mA if [OU2] = [InEG]�
• System pressure below the measuring range:
- output signal between 4 and 3,8 mA if [OU2] = [I]�
- output signal > 20 mA if [OU2] = [InEG]�
Voltage output
Factory setting Measuring range scaled
P = system pressure, MAW = initial value of the measuring range, MEW = final value of
the measuring range
1
: [OU2] = [U];
2
: [OU2] = [UnEG]
The output signal is between 0 and 10 V ([OU2] = [U]) or between 10 and 0 V
([OU2] = [UnEG]) in the set measuring range�
It is also indicated:
• System pressure above the measuring range:
- output signal > 10 V if [OU2] = [U]�
• System pressure below the measuring range:
- output signal > 10 V if [OU2] = [UnEG]�

8
4.4 Diagnostic function
Output 1 is used as a diagnostic output according to DESINA specification if OU1
= dESI�
• If there is no fault, the output is switched and carries UB+ (if P-n = PnP) or UB-
(if P-n = nPn)�
• In case of malfunctions the output becomes inactive� The following
malfunctions are detected:
- undervoltage (starting with 18V); overvoltage (starting with 33V);
- temperature at the process connection too high (> 150°C) / too low (< -30°C);
- intrinsic temperature of the unit too high (> 100°C) / too low (< -30°C);
- RAM fault�
5 Installation
Ensure that no pressure is applied to the installation while mounting or
removing the sensor� Please note: Display „0%“ does not mean that the
system is free of pressure!
Horizontal mounting recommended for high medium temperatures�
►Screw the sensor into a G ¾
process fitting�
►Tighten the sensor with a spanner
until you can feel the end stop�
You can replace the Viton O-ring (B)
by the supplied EPDM O-ring�
A = freely rotatable housing
The unit is adaptable for various G ¾ process fittings� G ¾ process adapters to be
ordered separately as accessories�

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Mounting
1 2
3
►Slightly grease the threads and sealing areas of the sensor and adapter with
lubricating paste (C)�
The paste must be suitable and approved for the application and compatible
with the elastomers used�
Recommendation: Klüber paste UH1 84-201 with USDA-H1 approval for the
food industry�
►Make sure that the O-ring (B) is correctly positioned�
►Screw the unit into the adapter (E) until it is hand-tight (fig� 2)� Do not damage
the sealing chamfers�
►Clamp sensor and adapter into a clamping device (F); (fig� 3)� Tighten the
clamping device only slightly so that the adapter does not warp�
►Tighten the sensor using a spanner until you can feel the end stop�
►Fix the unit + adapter to the process connection by means of a coupling nut, a
clamp flange or the like (D); (fig 1)�
Welding adapter
►First weld the adapter, then mount the sensor� Follow the instructions included
with the adapter�

10
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:
OUT1 p-switching OUT1 n-switching
Pin 1 Ub+
Pin 3 Ub-
Pin 4 (OUT1) • binary switching output for pressure monitoring
• diagnostic output if [OU1] = [dESI]
Pin 2 (OUT2) • analogue output for system pressure
Core colours of ifm sockets:
1 = BN (brown), 2 = WH (white), 3 = BU (blue), 4 = BK (black)

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7 Operating and display elements
1 to 8: Indicator LEDs
- LED 1 to LED 6 = system pressure in unit of measurement as indicated on the label�
LEDs 5 to 6 not used for units with 3 adjustable units of measurement�
- LED 7 not used�
- LED 8 = switching state of the output (LED lights if output 1 is switched)�
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�

12
8 Menu
8.1 Menu structure

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8.2 Menu explanation
SP1/rP1 Maximum / minimum value for system pressure, at which output 1 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�
• Diagnostic signal [dESI]�
OU2 Output function for OUT2:
• Analogue signal for the current system pressure
: 4���20 mA [I], 20���4 mA
[InEG], 0���10 V [U], 10���0 V [UnEG]�
tCOF Teaching zero-point calibration�
tASP Teaching analogue start point for the system pressure: set value at which
4 mA / 0 V are output (20 mA / 10 V on [OU2] = [InEG] / [UnEG])�
tAEP Teaching analogue end point for the system pressure: set value at which
20 mA / 10 V are output (4 mA / 0 V on [OU2] = [InEG] / [UnEG])�
EF Extended functions / Opening menu level 2�
Uni Standard unit of measurement for the 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 the system pressure: measured value at which
4 mA / 0 V are output (20 mA / 10 V on [OU2] = [InEG] / [UnEG])�
AEP Analogue end point for the system pressure: measured value at which
20 mA / 10 V are output (4 mA / 0 V on [OU2] = [InEG] / [UnEG])�
HI Maximum value memory for the system pressure�
LO Minimum value memory for the system pressure�
COF Zero point calibration�
dS1 Switch-on delay for OUT1�
dr1 Reset delay for OUT1�
P-n Output polarity for OUT1: pnp or npn�
dAP Damping for the switching output (OUT1)�
dAA Damping for the analogue output (OUT2)�
diS Update rate and orientation of the display�
rES Restore the factory setting�

14
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:
1Selecting parameter
►Press [Mode/Enter] until the
requested parameter is displayed�
2Setting the parameter value
►Press [Set] and keep the buton
pressed�
> Current setting value of the
parameter bit flashes for 5 s�
> After 5 s: 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�
3Acknowledge parameter value
►Press [Mode/Enter] briefly�
> The parameter is displayed again�
The new setting value is stored�
Set more parameters
►Start again with step 1�
Finishing 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�

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• Changing from menu level 1 to menu level 2:
►Press [Mode/Enter] until [EF] is
displayed.
►Press [Set] briefly�
> The first parameter of the submenu is
displayed (here: [Uni])�
If menu level 2 is protected by 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�
Delivery by ifm electronic: no access
restriction�
• Locking / unlocking
The unit can be locked electronically to prevent unintentional wrong settings�
►Ensure that the unit is in the normal
operating mode�
►Press [Mode/Enter] + [Set] for 10 s�
> [Loc] is displayed�
During operation: [Loc] is displayed briefly when you try to change parameter values�
For unlocking:
►Press [Mode/Enter] + [Set] for 10 s�
> [uLoc] is displayed�
On delivery: Unlocked�
• 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�

16
9.2 Configuring the display (optional)
►Select [Uni] and set the unit of measurement:
- [bAr], [mbAr],
- [MPA], [kPA],
- [PSI],
- InHO] (only PI2996 and PI2997),
- [mWS] (only PI2996 and PI2997)�
►Select [SELd] and set the display mode:
- [P]: Pressure in the unit set in Uni�
- [P%]: percentage value (pressure in % of the set scaling of the
analogue output� The following applies: 0% = ASP value; 100% = AEP
value)�
NOTE: Display „0%“ does not mean that the system is free of pressure�
►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�
- [rd1], [rd2], [rd3]: Display like d1, d2, d3; rotated by 180°�
- [OFF]: The display is deactivated in the operating mode� If one of the
buttons is pressed, the current measured value is displayed for 15 s�
Another press of the Mode/Enter button opens the Display mode� The
LEDs remain active even if the display is deactivated�
9.3 Setting the output signal
9.3.1 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�
As an alternative: configure OUT1 as diagnostic output:
►Select [OU1] and set [dESI]�
►Select [OU2] and set the anologue function:
- [I] = current signal proportional to the pressure 4…20 mA,
- [InEG] = current signal proportional to the pressure 20…4 mA,
- [U] = voltage signal proportional to the pressure 0���10 V,
- [UnEG] = voltage signal proportional to the pressure 10���0 V�

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9.3.2 Setting the switching limits
►Select [SP1] and set the value at which OUT1 switches�
►Select [rP1] and set the value at which OUT1 switches back�
rP1 is always lower than SP1� The unit only accepts values which are lower
than SP1�
9.3.3 Scaling the analogue value
►Set the requested minimum pressure in the system�
►Press [Mode/Enter] until [tASP] is displayed�
►Press [Set] and keep the buton pressed�
> The currently set value flashes�
►Release [Set] when the display stops flashing�
> The new set value is displayed�
►Press [Mode/Enter] briefly�
> The current system pressure is defined to be the start value for the
analogue signal�
►Set the requested maximum pressure in the system�
►Press [Mode/Enter] until [tAEP] is displayed�
►Press [Set] and keep the buton pressed�
> The currently set value flashes�
►Release [Set] when the display stops flashing�
> The new set value is displayed�
►Press [Mode/Enter] briefly�
> The current system pressure is defined to be the end value for the
analogue signal�
ASP / AEP can only be taught within defined limits (→ 12.1 setting ranges). If the
teaching process is carried out at an invalid pressure, [UL] or [OL] is displayed� After
acknowledgement by [Mode/Enter], [Err] flashes, the ASP value / AEP value is not
changed�
As an alternative:
►Select [ASP] and set measured value at which 4 mA / 0 V are output
(20 mA / 10 V at [OU2] = [InEG] / [UnEG])�
►Select [AEP] and set measured value at which 20 mA / 10 V are output
(4 mA / 0 V at [OU2] = [InEG] / [UnEG])�
Minimum distance between ASP and AEP = 25 % of the final value of the
measuring range (scaling factor 1:4)�

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9.4 User settings (optional)
9.4.1 Zero-point calibration
►Select [COF] and set a value between -5% and 5% of the final value of
the measuring range� The internal measured value “0” is shifted by this
amount�
As an alternative:
Automatic adaptation offset (setting range 0 bar ±5%); e�g� in the event of a
deviation of the mounting location of the sensor and the zero point level for
level measurement�
►Make sure that no pressure is applied to the system�
►Press [Mode/Enter] until [tCOF] is displayed�
►Press [Set] and keep the buton pressed�
> The current offset value (in %) briefly flashes, then the current system
pressure (in the selected display unit) is displayed�
►Release [Set]�
►Press [Mode/Enter] briefly to confirm the new offset value�
9.4.2 Setting the delay time for OUT1
[dS1] = switch-on delay / [dr1] = switch-off delay�
►Select [dS1] or [dr1] and set the value between 0�1 and 50�0 s (at 0�0 the
delay time is not active)�
9.4.3 Setting the output polarity for OUT1
►Select [P-n] and set [PnP] or [nPn]�
9.4.4 Setting the damping for the switching signal
►Select [dAP] and set value between 0�1 and 100�0 s (at 0�0 = [dAP] is
not active)�
dAP value = response time between pressure change and change of the
switching status in seconds�
[dAP] influences the switching frequency: fmax = 1 ÷ 2dAP�
[dAP] also affects the display�
9.4.5 Setting the damping for the analogue signal
►Select [dAA] and set value between 0�1 and 100�0 s (at 0�0 = [dAA] is
not active)�
dAA value = response time between pressure change and change of the
analogue signal in seconds�

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9.5 Service functions
9.5.1 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�
9.5.2 Reset all parameters to the factory setting
►Select [rES]
►Press [SET] until [----] is displayed�
►Press [MODE/ENTER] briefly�
It makes sense to note down your own settings before executing the
function (→ 13 Factory preset).
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] until the requested parameter is displayed�
►Press [Set] briefly�
> The unit displays the corresponding parameter value for about 15 s� After
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; the output is switched off as long as the short circuit exists�
[Err] Internal fault, invalid input�
The faults SC1 and Err are indicated even if the display is deactivated�

20
10.3 Cleaning of the filter cover
If viscous and residues producing
media clog the filter cover of
the sensor (and thus reduce the
measuring accuracy slightly), you can
clean it�
►Unscrew the filter cover (B) (use a
pair of pliers with plastic-covered
jaws for this)�
►Clean the cover thoroughly�
The vent (A) should only be cleaned by skilled personnel and with utmost care�
Possible medium residues must not be compressed and pressed into the vent�
This could clog the filter system and reduce the measuring accuracy of the
sensor�
►Screw the filter cover again tightly�
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