Ifm Pf295 series User manual

Operating instructions

Electronic pressure sensor

PF295x UK

11426183 / 00 11 / 2021

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 ��5

5 Installation��7

6 Electrical connection��9

7 Operating and display elements ��10

8 Menu�� 11

8�1 Menu structure�� 11

8�2 Menu explanation ��12

9 Parameter setting ��13

9�1 Parameter setting general ��13

9�2 Configuring the display (optional) ��14

9�3 Setting the output signal ��15

9�3�1 Setting the output function��15

9�3�2 Setting the switching limits ��15

9�3�3 Scaling the analogue value ��15

9�4 User settings (optional)��15

9�4�1 Zero-point calibration��15

9�4�2 Calibration reset ��15

9�4�3 Setting the delay time for the switching outputs ��16

9�4�4 Setting the output polarity��16

9�4�5 Setting the damping for the switching signal ��16

9�4�5 Setting the damping for the analogue signal ��16

9�5 Service functions ��16

9�5�1 Reading the min�/max� values for the system pressure��16

10 Operation��16

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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�

• The manufacturer assumes no liability or warranty for any consequences

caused by tampering with the product or incorrect use by the operator�

10�1 Read the set parameter values ��17

10�2 Fault indication ��17

10�3 Cleaning of the filter cover��17

4

• 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 • switching signal for pressure limit values

OUT2

• switching signal for pressure limit values

• analogue signal 4��20 mA

• analogue signal 0��10 V

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4.2 Pressure monitoring / 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�

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1 2

P = system pressure; HY = hystereris; FE = window

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]) or a 0��10 V signal ([OU2] = [U])�

• By setting the parameter ASP you define the measured value at which the

output signal is 4 mA / 0 V�

• By setting the parameter AEP you define the measured value at which the

output signal is 20 mA / 10 V�

Minimum distance between [ASP] and [AEP] = 25 % of the final value of the

measuring range (turn down 1:4)�

6

Current output

Factory setting Measuring range scaled

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P = system pressure, MEW = final value of the measuring range

The output signal is between 4 and 20 mA� It is also indicated:

• System pressure above the measuring range: output signal > 20 mA �

• System pressure below the measuring range: output signal between 4 and

3�2 mA�

Voltage output

Factory setting Measuring range scaled

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P = system pressure, MEW = final value of the 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�

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5 Installation

Ensure that no pressure is applied to the installation while mounting or

removing the sensor�

►Screw the sensor into a G¾

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�

36

B

A







A = rotatable housing

Adapters G ¾ ensure that the sensor can be connected to different process

connections� The adapters have to be ordered separately as accessories�

►Mount the adapter (D) to the

sensor�

►Fix sensor + adapter by means

of a coupling nut, a clamp flange

or similar (C) to the process

connection�

If it is not possible to slide the fixing

element (C) down over the top of the

sensor: slide it up over the bottom

of the sensor before the adapter is

mounted�

C

D

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Mounting the adapter

►Slightly grease the threads and

sealing areas of the sensor and

adapter with lubricating paste (1)�

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�

B

1

►Screw the sensor into the adapter

until it is hand-tight� Do not damage

the sealing chamfers�

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►Clamp sensor and adapter into a

clamping device (E)� Tighten the

clamping device only slightly so

that the adapter does not warp� The

sealing chamfers (F) must not be

damaged�

►Tighten the sensor using a spanner

until you can feel the end stop�

E

F

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Welding adapter

First weld the adapter, then mount the sensor� Follow the instructions included

with the adapter�

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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 and connect the unit as follows:

2 x p-switching 2 x n-switching

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L

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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 p-switching / 1 x analogue 1 x n-switching / 1 x analogue

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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

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

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1: 7-segment display

- Display of the system pressure1),

- display of parameters and parameter values�

2: 2 x LED red

- Switching status; lights if output I / II has switched�

3: Set button

- Setting of the parameter values (scrolling by holding pressed; incremental by pressing

briefly)�

4: Mode/Enter button

- Selection of the parameters and acknowledgement of the parameter values�

1) 3-digit display in the minus range: -�XX = - 0,XX

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8 Menu

8.1 Menu structure

RUN

M

S

M

S

M

S

M

S

M

S

M

S

M

S

M

S

M

S

M

S

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S

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S

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S

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RUN

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S

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S

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S

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S

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S

M

OU2 = Hno, Hnc, Fno, Fnc

OU2 = I, U

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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�

OU2 Output function for OUT2:

• 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], 0��10 V [U]�

SP2/rP2 Maximum / minimum value for system pressure, at which output 2 changes

its switching status�

ASP Analogue start point for the system pressure: measured value at which

4 mA / 0 V are output�

AEP Analogue end point for the system pressure: measured value at which

20 mA / 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 OUT1/OUT2�

dr1/dr2 Reset delay for OUT1/OUT2�

P-n Output polarity: pnp / npn

dAP Damping for the switching outputs�

dAA Damping for the analogue signal�

diS Update rate and orientation of the display�

Uni Standard unit of measurement for the system pressure�

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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�

Mode/Enter Set

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�

Mode/Enter Set

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�

Mode/Enter Set

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: [HI])�

• 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�

> Indication goes out briefly (acknowledgement of locking / unlocking)�

Units are delivered from the factory in the unlocked state�

With the unit in the locked state [Loc] is indicated briefly when you try

to change parameter values�

• 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 Configuring the display (optional)

►Select [Uni] and set the unit of measurement:

- bAr (= bar / mbar),

- PSI,

- PA (= MPa / kPa)�

►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� 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�

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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�

►Select [OU2] 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,

- [I] = current signal proportional to the pressure 4…20 mA,

- [U] = voltage signal proportional to the pressure 0��10 V�

9.3.2 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�

9.3.3 Scaling the analogue value

►Select [ASP] and set measured value at which 4 mA / 0 V are output�

►Select [AEP] and set measured value at which 20 mA / 10 V are output�

Minimum distance between ASP and AEP = 25 % of the final value of the

measuring range (scaling factor 1:4)�

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�

9.4.2 Calibration reset

►Select [CAr]�

►Press [SET] until [---] is displayed�

►Press [Mode/Enter] briefly�

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9.4.3 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)

9.4.4 Setting the output polarity

►Select [P-n] and set [PnP] or [nPn]�

9.4.5 Setting the damping for the switching signal

►Select [dAP] and set value between 0�01 and 4�00 s (at 0�00 = [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 a value: 0,0 - 0,1- 0,5 or 2,0 s (at 0�0 = [dAA] is not

active)�

dAA value = response time between pressure change and change of the

analogue signal in seconds�

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�

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 → 7 Operating and display elements�

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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 (presure above measuring range of the sensor)�

[UL] Underload (pressure below measuring range of the sensor)�

[SC1] Flashing: short circuit in the switching output 1*�

[SC2] Flashing: short circuit in the switching output 2*�

[SC] Flashing: short circuit in both switching outputs*�

*The output concerned is switched off as long as the short circuit exists�

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�

AB

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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IFM PF295 Series User manual

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