3 Functions and features The pressure sensor detects the system pressure of machines and installations� 3.1 Applications Type of pressure: relative pressure Permissible Order no. Measuring range Bursting pressure overload pressure PI2993 -1���25 -14�4���362�7 1 450 2 900 PI2994 -1���10 -14�5���145 2 175 PI2995...
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). •...
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• 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)�...
Voltage output Factory setting Measuring range scaled U [V] U [V] P = system pressure, MAW = initial value of the measuring range, MEW = final value of the measuring range : [OU2] = [U]; : [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�...
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 pro- cess fitting�...
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Mounting ► 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�...
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� For units with cULus approval and the scope of validity cULus: The device shall be supplied from an isolating transformer having a secondary Listed fuse rated as noted in the following table�...
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OUT1 p-switching OUT1 n-switching 2: OUT2 2: OUT2 4: OUT1 4: OUT1 Pin 1 Pin 3 • binary switching output for pressure monitoring Pin 4 (OUT1) • 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)
7 Operating and display elements 3 4 5 6 Mode/Enter 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�...
8.2 Menu explanation SP1/rP1 Maximum / minimum value for system pressure, at which output 1 changes its switching status� 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� •...
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 set- ting has been terminated� 9.1 Parameter setting general Each parameter setting requires 3 steps: Selecting parameter ►...
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► 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�...
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�...
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�...
9.4 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�...
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� ►...
10.3 Cleaning of the filter cover If viscous and residues producing media clog the filter cover of the sen- sor (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)�...
13 Factory setting Factory setting User setting 25% VMR* 23% VMR* ASP / tASP 0% VMR* AEP / tAEP 100% VMR* COF / tCOF bAr / mbAr SELd * = the indicated percentage of the final value of the measuring range (VMR) of the corresponding sensor in bar / mbar is set�...
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