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Product Introduction
When a steam turbine trips offline due to an erratic speed signal, the downtime cost runs into tens of thousands per hour. The ABB 87TS01-1551 is the go-to inductive proximity sensor engineered specifically for high-vibration turbine environments. It replaces older tachogenerators with solid-state reliability.What sets this probe apart is its dual-coil differential design. Unlike single-coil sensors that can false-trigger on electrical noise, this unit cancels out common-mode interference—critical when mounted next to high-energy turbine exciters. It delivers a clean square wave signal to the governor system, ensuring stable grid synchronization.
Key Technical Specifications
- Model: 87TS01-1551
- Type: Inductive Proximity Sensor
- Output Signal: Digital Square Wave
- Power Supply: 15–30 VDC
- Sensing Distance: 0.5–2.5 mm (depending on target)
- Thread Size: M18 × 1.5
- Connection: Integral Cable or Connector (varies by batch)
- Operating Temperature: –25°C to +125°C
- Frequency Range: 0 to 10 kHz
- Certification: CE, CSA
- Material: Stainless Steel Housing
Installation Pitfalls Guide
Firmware & Configuration Mismatch
- Risk: While this is a passive sensor, the配套 module (e.g., 87TQ01) must be configured to expect a square wave input. Loading a sine-wave config will result in no-count faults.
- Tip: Verify the signal type setting in the turbine control cabinet before installation.
DIP Switch / Jumper Misconfiguration
- Risk: The sensor head has no switches, but the termination module often uses jumpers to set excitation voltage.
- Tip: If the LED on the module doesn’t light, check the +24 VDC jumper position first.
Wiring & Polarity Errors
- Risk: Reversing the polarity will not damage this sensor immediately, but it will not output a signal.
- Tip: The standard color code is Brown (+) and Blue (–). Use a multimeter to confirm the cable run isn’t swapped inside the conduit.
Target Gear & Air Gap
- Risk: The air gap must be set precisely. Too large (>2.5 mm) and the signal amplitude drops below detection threshold.
- Tip: Use a feeler gauge. The sweet spot is usually 1.5 mm. Don’t rely on torque alone; thermal expansion changes the gap.
Vibration Loosening
- Risk: Turbine bearing caps vibrate. A sensor not lock-wired or loctited will back out, changing the air gap mid-run.
- Tip: Apply thread locker (Loctite 243) and use a second nut as a jam-lock if possible.
