Description
Application Scenarios
Picture a 300 MW steam-turbine generator set during a cold startup. The rotor is turning slowly, driven by the turning gear, and the control room needs to know three things with absolute certainty: is the shaft actually rotating, in which direction, and at what exact speed? A single missed pulse at this stage can cascade into a mistimed valve sequence, a bearing rub or, in the worst case, an overspeed event.
That is exactly the gap the BENTLY 133442-01 fills. Mounted on the 3500/50 tachometer module in the Turbine Supervisory Instrumentation (TSI) rack, it receives the conditioned signal from a 3300 XL 8 mm eddy-current probe watching a keyway or gear tooth. It accepts the wide +10.0 V to –24.0 V pulse swing, rejects common-mode noise picked up along hundreds of feet of shielded cable, and presents a stable, ESD-protected buffered output at the front-panel coaxial connector for portable analyzers and diagnostic rigs. The result: operators see true shaft speed from the first revolution, maintenance teams capture clean keyphasor traces for balancing, and the plant avoids the false “zero speed” trips that plague magnetic-pickup-only designs at low rpm.
The same story repeats in a Middle Eastern gas-compression station, where sand, heat and 24/7 duty cycles punish every component. Here the 133442-01 earns its keep through tolerance rather than drama: an operating envelope of –30 °C to +65 °C, 95% non-condensing humidity, and compliance with EN 55011 radiated-emission and IEC 61000-4-x immunity standards means the speed channel keeps reading correctly next to a 400 kV busbar. When a probe cable finally fatigues after years of service, the terminal block’s removable green connector (Bently part 00580434 / 00580436) lets a technician break and remake the circuit in minutes—without disturbing the adjacent vibration or displacement channels.
Parameter
| Main Parameters | Value / Description |
|---|---|
| Product Model | 133442-01 |
| Manufacturer | BENTLY NEVADA (Baker Hughes) |
| Product Category | Speed / tachometer I/O (input-output) module, 3500 series |
| Compatible Monitor | 3500/50 two-channel tachometer module (half-height, rack-mounted) |
| Channels | 2 independent speed channels per I/O module |
| Input Signal | 1 or 2 eddy-current proximity probes or magnetic pickup per channel; signal range +10.0 V to –24.0 V, clamped internally beyond range |
| Input Impedance | 20 kΩ standard (40 kΩ in TMR arrangement; 7.15 kΩ with integral safety barrier) |
| Power Consumption | Typically 5.8 W per module |
| Sensor Excitation | –24 V dc sensor supply, up to 40 mA per channel |
| Analog Output | 4–20 mA recorder output per channel, proportional to full-scale rpm or rpm/min; load 0–12 V dc, up to 600 Ω; resolution 0.3662 µA/bit at room temperature; accuracy ±0.25% (±0.7% over full temperature range) |
| Buffered Output | Front-panel coaxial connector per channel, short-circuit and ESD protected; 550 Ω output impedance |
| Terminal Type | Internal terminals with detachable 8-/6-/12-position connectors (green 12-position P/N 00502133, green 8-position P/N 00580434, green 6-position P/N 00580436) |
| Communication | Backplane data bus to 3500/20 RIM; framework protocol to host/configuration PC (RS232/RS422 via RIM, plus 3500/92 Ethernet/serial gateway option) |
| Configuration | 3500 Rack Configuration Software: speed + setpoint alarm + speed-band alarm; speed + setpoint + zero-speed indication; speed + setpoint + rotor-acceleration alarm |
| Full-Scale Range | Up to 99,999 rpm; 1–255 events per revolution; max input frequency 20 kHz; minimum trigger amplitude 1 V peak-to-peak |
| Peak-Hold | Stores highest attained speed, highest reverse speed or reverse-rotation count (user-resettable) |
| Dimensions (module) | Approx. 9.50 × 0.96 × 9.52 in (half-height, single slot in 3500 rack) |
| Weight | Approx. 0.82 kg |
| Operating Temp. | –30 °C to +65 °C (–22 °F to +149 °F) |
| Storage Temp. | –40 °C to +85 °C |
| Humidity | Up to 95%, non-condensing |
| EMC Compliance | EN 55011 (radiated emissions); IEC/EN 61000-4-2 (ESD, Class A), 4-4 (fast transients, Class B), 4-5 (surge, Class B), 4-8 (magnetic field), 4-11 (voltage dips); ENV 50204 (radio interference, Class B) |
| Mounting | 3500 rack, half-height slot, hot-swappable; internal terminal wiring, no rear Euro-connector |
| Agency / Safety | Designed for non-incendive / intrinsically safe field circuits when used with approved barrier variant (136703-01); not a safety-certified overspeed trip device |
