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Bently Nevada
Bently Nevada 991 Thrust Transmitter
Quote on request
No online payment · add lines to RFQ BOM
BN 991: 4–20 mA axial thrust; 3300 NSv; +12…+35 VDC; ±1.5% FS typical. RFQ.
Download datasheet PDF
RFQ cart holds BOM lines only. Submit for engineering quote.
Key parameters
Approvals
Zone 2 / Div 2 options (order-code)
Mounting
35 mm DIN-rail clips and/or bulkhead screws
Notes
Specs from Bently Nevada 991 Thrust Transmitter Datasheet 141618 Rev. R. Distinct from sibling 34705 (177230 seismic).
Function
2-wire loop-powered 4–20 mA axial thrust (displacement) transmitter with integrated Proximitor
Probe Compatibility
3300 NSv proximity probe + matching extension cable (5 m or 7 m system lengths)
Power
+12 to +35 VDC at transmitter terminals
Fits axial thrust displacement loops where you need a Bently Nevada 991. Two-wire loop-powered 4–20 mA thrust transmitter with integrated Proximitor for 3300 NSv probe and 5 m or 7 m extension systems, +12 to +35 VDC at terminals, loop accuracy within ±1.5% over configured full-scale typical, dynamic gap diagnostic output, Not OK <3.6 mA, and non-interacting external zero/span pots.
Key advantages
- Function — Axial thrust 4–20 mA
- Probe — 3300 NSv; 5/7 m systems
- Supply — +12 to +35 VDC
- Accuracy — Within ±1.5% FS typical
- Diagnostics — PROX OUT; Not OK
Typical applications
- Thrust position loops.
- Axial displacement monitoring.
- Proximitor thrust transmitters.
Selection guide
- FS thrust range
- System length
- Loop resistance
Common mistakes
- Wrong probe/cable length.
- Loop resistance beyond 1000 Ω at 35 V.
- Ignoring Not OK threshold.
When to RFQ / what to tell us
- FS/system length.
- Quantity, ship-to.
Request a Quote · Get selection help
Specs
| Spec | Value |
|---|---|
| SKU | 34703 |
| Brand | Bently Nevada |
| Model | 991 Thrust Transmitter |
| Product type | Thrust Transmitter |
| Function | 2-wire loop-powered 4–20 mA axial thrust (displacement) transmitter with integrated Proximitor |
| Probe compatibility | 3300 NSv proximity probe + matching extension cable (5 m or 7 m system lengths) |
| Power | +12 to +35 VDC at transmitter terminals |
| Output | 4–20 mAdc over configured full-scale thrust range; max loop resistance 1000 Ω at 35 Vdc |
| Loop accuracy | Within ±1.5% over specified full-scale (typical); rated TEST input to 250 Ω loop |
| Prox out | Dynamic gap/vibration diagnostic output; linear range 0.25–1.65 mm (10–65 mils); 7.87 mV/µm (200 mV/mil) ±6.5% typical |
| Not OK | Output <3.6 mA within 100 µs on Not OK; restores within 0.1 s after cleared |
| Zero span | Non-interacting external zero and span potentiometers |
Documents
FAQ
Q: Supply? A: +12 to +35 VDC.
Q: Probe? A: 3300 NSv + matching cable.
Q: What should I send for a quote? A: FS/system length, quantity, ship-to.
Links
| Parameter | Value |
|---|---|
| Approvals | Zone 2 / Div 2 options (order-code) |
| Mounting | 35 mm DIN-rail clips and/or bulkhead screws |
| Notes | Specs from Bently Nevada 991 Thrust Transmitter Datasheet 141618 Rev. R. Distinct from sibling 34705 (177230 seismic). |
| Function | 2-wire loop-powered 4–20 mA axial thrust (displacement) transmitter with integrated Proximitor |
| Probe Compatibility | 3300 NSv proximity probe + matching extension cable (5 m or 7 m system lengths) |
| Power | +12 to +35 VDC at transmitter terminals |
| Loop Accuracy | Within ±1.5% over specified full-scale (typical); rated TEST input to 250 Ω loop |
| Prox Out | Dynamic gap/vibration diagnostic output; linear range 0.25–1.65 mm (10–65 mils); 7.87 mV/µm (200 mV/mil) ±6.5% typical |
| Not Ok | Output <3.6 mA within 100 µs on Not OK; restores within 0.1 s after cleared |
| Zero Span | Non-interacting external zero and span potentiometers |
| Transmitter Temperature | Operating −35 to +85 °C; storage −51 to +100 °C |
| Probe Temperature | Operating/storage −52 to +177 °C |
| Humidity | 100% condensing non-submerged with connector protection; potted construction |