Description
The ifm PP7553 is an electronic pressure switch with integrated digital display, featuring a ceramic measuring cell (capacitive ceramic sensor — overload-resistant, no dead-end fill fluid) for continuous pressure monitoring and switch-point control of gases, liquids, and vapors in industrial systems. It provides 1 or 2 programmable switching outputs (PNP/NPN) and often a 4–20 mA analog output (model dependent) for transmitting the pressure value to a PLC. Related models PP7551, PP7552, PP7554, PP7556 cover different pressure ranges (vacuum to 600 bar), process connections (G¼, G½, ¼ NPT), and output configurations.
The ceramic cell is dry — no oil-filled diaphragm — making it suitable for food/pharma (with appropriate wetted materials) and giving excellent long-term stability with no risk of silicone oil contamination. It features a bright 4-digit 7-segment LED display + bar graph, 3 front keys for setpoint teach-in, and IO-Link on select variants.
Key Features
- Sensor Element: Ceramic capacitive measuring cell (dry, overload-proof up to 3× or burst, no filling oil)
- Pressure Ranges: 0…1 bar to 0…600 bar (vacuum/composite also available — check suffix)
- Outputs: 2 × PNP/NPN switching outputs (or 1 × PNP + 1 × 4–20 mA analog — PP7553 typical)
- Display: Dual 4-digit LED + bar graph (actual pressure, switch status, unit)
- Setpoint Setting: Via front keys (teach from live value) or IO-Link — no PC required for basic setup
- Process Connection: G¼ A (DIN 3852-2Form B) stainless steel — other variants G½, NPT
- Country of Origin: Germany
Model Reference Table
Model | Pressure Range (Example) | Process Conn. | Outputs | Display | Typical Use |
|---|---|---|---|---|---|
PP7551 | 0…10 bar (var. by suffix) | G¼ A | 2× PNP switch | Yes | General pneumatic / hydraulics |
PP7552 | 0…25 bar | G¼ A | 2× PNP switch | Yes | Medium-pressure hydraulics |
PP7553 | 0…400 bar (typ. for PP7553 suffix) | G¼ A | 1× PNP + 1× 4–20 mA | Yes | High-pressure + analog feedback |
PP7554 | 0…1 bar / vacuum | G¼ A | 2× PNP switch | Yes | Vacuum / low-pressure air |
PP7556 | 0…100 bar (var.) | G¼ A / G½ | 2× PNP switch or sw+ana | Yes | Process skids / pump control |
⚠️ Important:
Technical Specifications (Representative — PP7553, 0…400 bar, PNP+4–20 mA, G¼ A, M12 8-pin)
Parameter | Specification |
|---|---|
Model / Order Code | PP7553 (ifm Electronic — complete suffix defines range/seal/out) |
Measuring Principle | Ceramic capacitive pressure sensor (dry, oil-free) |
Pressure Range | 0 … 400 bar (gauge — other ranges on PP75xx family) |
Accuracy | ≤ ±0.5 % FS (typical); ≤ ±0.25 % FS (high-accuracy var.) |
Long-Term Stability | ≤ ±0.05 % FS / year |
Switching Outputs | 1 × PNP (or 2 × PNP — model dependent) + 1 × Analog 4–20 mA (PP7553 typ.) |
Switching Frequency | ≤ 100 Hz (electronics); mechanical response < 1 ms |
Display | 4-digit red 7-seg (pressure value) + bar graph (percentage of range) |
Power Supply | 18–30 V DC (typical 24 V DC) |
Electrical Connection | M12 × 8-pin (A-coded) — some var. M12 × 4-pin (switch only) |
Process Connection | G¼ A (male) — stainless steel 1.4404 (316Ti) |
Wetted Materials | Ceramic Al₂O₃ (measuring cell), Stainless 1.4404, Seal: FKM (std) / EPDM / FFKM (suffix) |
Overload Pressure | ≤ 3 × FS (non-destructive typical for ceramic cell) |
Burst Pressure | ≥ 5 × FS (or 1000 bar min — whichever higher) |
Protection | IP65/IP67 (with mated connector), front IP67 with gasket |
Mounting | Process connection + optional mounting bracket |
Dimensions (Sensor Body) | Approx. Ø 42 mm × 85 mm (behind process conn.) |
Weight | ~ 0.25 kg |
Standards | CE, UL (component), RoHS, NAMUR recommendation NE43 / NE21 (diag.) |
Warranty & After-Sales
- Factory new units: 12 months warranty
- Refurbished units: 3-6 months warranty
- Technical support for:
- Complete ifm order-code decoding (pressure range / seal / output / connector)
- Switching setpoint teach-in (keypad: show live value → press SET → auto-store)
- Hysteresis / window mode configuration
- IO-Link parameterization (if -I variant)
- Media compatibility check (seal selection: FKM vs EPDM vs FFKM)
- Cross-reference vs. WIKA S-11 / SITRANS P320 / Danfoss MBS 3000 series
Delivery Time
- Standard delivery: 3-5 working days (stock suffixes)
- Express shipping available upon request
Why Choose Our Store
- Genuine ifm Electronic pressure switches — not clones with drifting thin-film sensors
- Global supply network with competitive pricing
- Expertise in ifm ceramic-cell pressure tech & IO-Link parameterization
- Comprehensive technical documentation (suffix decoder, dimensional drawing, media compatibility chart)
- Responsive customer service and support
Applications
- Hydraulic Power Units: Monitor system pressure, set hi-lo alarms (2 switch outputs)
- Pneumatic Systems: Filter/regulator clog detection (differential with second sensor) — PP7554 for vacuum/low press.
- Pump Discharge / Suction: Protect against overpressure; analog out for trending
- Machine Tool Coolant / Lubrication: Ceramic cell resists water hammer; no oil contamination risk
- Process Skids: CIP-compatible with EPDM seal option — sanitary clamp variants also available in PP series
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