An ifm pressure sensor.
¶ What it measures
Relative (gauge) pressure and vacuum, −1 to 10 bar (−14.5 to 145 psi) — see Pressure.
| Measuring range | −1 to 10 bar (−14.5 to 145 psi; −100 to 1000 kPa) |
| Pressure rating | 25 bar (360 psi), static |
| Min. burst pressure | 300 bar (4350 psi) |
| Vacuum resistance | −1000 mbar |
| Media | Liquids and gases |
| Medium temperature | −40 to +90 °C |
| Measuring element | Metallic thin-film cell |
| Characteristic deviation | < ±0.5 % of span (linearity incl. hysteresis and repeatability) |
| Switch point accuracy | < ±0.5 % of span |
| Repeatability | < ±0.05 % of span (with temperature fluctuations < 10 K) |
| Long-term stability | < ±0.1 % of span per 6 months |
| Temperature coefficient (zero and span) | < 0.1 % of span / 10 K (−25 to +90 °C); < 0.2 % of span / 10 K (−40 to −25 °C) |
| Response time | < 3 ms |
¶ Electrical interface
| Supply | 18–30 V DC; supply to EN 50178, SELV/PELV |
| Current consumption | < 15 mA |
| Power-on delay | < 0.3 s |
| Protection | Protection class III; reverse-polarity protected |
| Output | IO-Link on pin 4 (OUT1) |
| Switch outputs | 2 (OUT1 on pin 4, OUT2 on pin 2); PNP or NPN, selectable; N.O./N.C., hysteresis or window function |
| Switching output rating | 100 mA DC continuous per output, max. voltage drop 2 V, switching frequency < 170 Hz |
| Short-circuit protection | Yes, pulsed; overload protected |
| IO-Link | Revision 1.1, COM2 (38.4 kBaud), SIO mode supported, min. cycle time 5 ms, master port type A |
| Connector | M12, 4-pin, A-coded |
| Process connection | 1/4" NPT external thread (1/4-18 NPT), M5 internal thread; restrictor integrated |
¶ Environment and mechanical
| Ingress rating | IP67, IP69K |
| Ambient temperature | −40 to +90 °C (storage −40 to +100 °C) |
| Housing materials | Stainless steel (630 / 1.4542 / 17-4 PH); stainless steel (316L / 1.4404); PEI |
| Wetted materials | Stainless steel (303 / 1.4305); stainless steel (630 / 1.4542 / 17-4 PH) |
| Dimensions | Ø 18.9 mm, length 66.9 mm, 19 mm hex |
| Tightening torque | 50 Nm recommended (depends on lubrication, seal and pressure load) |
| Min. pressure cycles | 60 million (at 1.2 × nominal pressure) |
¶ Notes
- The sensor has no display or buttons. All settings, including the switch points and PNP/NPN output logic, are made over IO-Link or with an ifm memory plug.
- Over IO-Link the sensor reports pressure slightly beyond the measuring range (up to 10.5 bar) before it flags over-range. Values above 10 bar are outside the rated range.
- Relieve all pressure from the line before fitting or removing the sensor.
- Never exceed the 25 bar pressure rating, including pressure spikes. Exceeding the burst pressure even briefly can destroy the unit.
- The process connection has a built-in restrictor, equivalent to a 0.3 mm hole, to damp pressure peaks and cavitation. Heavy soiling can block it, and high-viscosity media slow the response by a few milliseconds.
- With cable runs over 30 m, or outdoors, ifm recommends limiting overvoltage pulses to 500 V max.
- The supply range starts at 18 V, higher than many 10–30 V sensors.
- In window mode the set and reset points have a fixed hysteresis of 0.25 % of the span.
¶ Maintenance
- Check the zero. With the line vented to atmosphere, the reading should be 0 bar. Any offset can be corrected with the zero-point calibration parameter (coF, ±5 % of span) over IO-Link.
- Check the restrictor. If the reading is slow or stuck while the line pressure changes, remove the sensor (with the line depressurised) and check the port for soiling.
- Check for pressure spikes. The sensor keeps minimum and maximum pressure memories (Lo / Hi) and an overload counter (HIPC) that counts events above a settable threshold (HIPS). A rising overload count means the line sees spikes that shorten sensor life. The memories and counter can be reset over IO-Link.
- Replacing a sensor. Settings can be restored from the IO-Link master’s data storage, or copied with an ifm memory plug.
- Factory reset. A “Restore Factory Settings” command is available over IO-Link.
¶ Using it with a controller
Wiring and configuration live with each controller:
- InteliHive — on an IO-Link port. See Supported Devices.
¶ Sources
- ifm PV7604 product page
- ifm PV7604 data sheet, PV7604-00, 13.04.2023
- ifm operating instructions, electronic pressure sensor PV76xx, 80262454/00 (copy hosted by Automatyka24)