Overview
The Georg Fischer Signet P525-1S flow sensor is an insertion-style paddlewheel flow meter engineered for demanding industrial flow measurement. This sensor combines 316 stainless-steel body construction with tungsten-carbide rotor pins to deliver reliable performance in high-pressure and high-temperature environments. The P525-1S model features socket-weld mini-tap fittings sized for ½ to 1 inch pipes, making it a drop-in solution for process control, equipment monitoring, and hydraulic system diagnostics.
Key Features
- Operating Range: 0.5 to 6 m/s (1.6 to 20 ft/s)
- Measurement Accuracy: ±1% linearity and ±0.5% repeatability at 25°C
- Wetted Materials: 316 SS sensor body, 17-4PH-1 stainless-steel rotor, tungsten-carbide rotor pin, carbon-fiber-reinforced PTFE bearings
- Pressure/Temperature Rating: 103 bar (1500 psi @ safety factor 1.5) at 149°C (300°F)
- Cable: 7.6 m (25 ft) standard, extendable to 61 m (200 ft), 2-conductor shielded 22 AWG
- Frequency Output: 39 Hz per m/s nominal (12 Hz per ft/s)
Technical Specifications
The P525-1S delivers consistent performance across industrial fluid-handling systems. The sensor uses stainless steel construction with insertion paddlewheel technology and is specifically designed with socket-weld mini-tap fittings for ½ to 1 inch pipes. Electrical output is frequency-based, with 5 to 8 mV peak-to-peak amplitude per Hz and 11.6 kΩ source impedance, making integration with PLC input modules and frequency counters straightforward. The minimum Reynolds number required is 4500, ensuring stable operation across a range of fluid viscosities and flow rates.
Typical Applications
This flow sensor is widely deployed in:
- Boiler feedwater and cooling-system monitoring
- Hydraulic system diagnostics and load-based metering
- Chemical-transport and reverse-osmosis systems
- Heat-exchanger flow verification
- Bearing lubrication and circulation loops
- HVAC chilled-water and hot-water distribution
Compatibility & Replacements
Compatible With
- DN15 to DN300 (½ to 12 inch) steel and stainless-steel pipes
- Socket-weld and weld-on mini-tap fittings
- Strap-on saddle fittings (21 bar @ 66°C maximum)
- Frequency input modules on PLCs (Allan-Bradley, Siemens, Mitsubishi, Omron)
- Inline and insertion flow-measurement configurations
Replaces / Drop-In Replacement For
- Georg Fischer Signet P525-1 (standard version with tungsten-carbide pin)
- Legacy paddlewheel sensors on ½ to 1 inch socket-weld connections
Works With
- Frequency counters and digital inputs on any 24 VDC control system
- Proportional and discrete hydraulic controllers
- SCADA systems and industrial data loggers
- Flow-totalizing and rate-monitoring instrumentation
- Allen-Bradley CompactLogix, ControlLogix, and MicroLogix PLC platforms
