991-25-70-01-00 Bently Nevada 991 Thrust Transmitter
991-25-70-01-00
991-25-70-01-00 is a Bently Nevada 991 two-wire, loop-powered thrust transmitter. The 991-25-70-01-00 order code specifies a centered 25-0-25 mil axial-displacement range, 7.0 m transducer-system length, 35 mm DIN-rail clips, and Agency option not required. 991-25-70-01-00 converts the signal from one compatible external 3300 NSv proximity probe and matching extension cable into a proportional 4-20 mA shaft-position signal for a machinery control system. Correct probe gap and range adjustment are critical, and the probe and extension cable are not part of 991-25-70-01-00 unless the quotation explicitly includes them.
Scope note: 991-25-70-01-00 identifies loop-powered thrust transmitter. Complete-system performance is labeled separately and does not apply to 991-25-70-01-00 alone.
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991-25-70-01-00 contains the transmitter signal-conditioning electronics, but 991-25-70-01-00 requires an external compatible 3300 NSv probe and matching extension cable. Those external components are not automatically included.
991-25-70-01-00 loop accuracy is a transmitter-loop specification. The PROX OUT range and scale-factor rows are explicitly complete transducer-system data measured with the compatible external chain and AISI 4140 target.
| Manufacturer | Bently Nevada, a Baker Hughes business |
|---|---|
| Product family | 991 Thrust Transmitter |
| Order code | 991-25-70-01-00 |
| Measured variable | Shaft axial position (thrust) |
| Configured centered full scale | 25-0-25 mil |
| Signal output | 4-20 mAdc, two-wire, proportional to shaft axial position |
| External transducer input | One external 3300 NSv proximity probe plus matching extension cable; external components are not automatically included |
| Configured system length | 7.0 m |
| Power at transmitter | +12 to +35 Vdc |
| Loop accuracy | Within +/-1.5% typical over full scale from TEST input to a 250-ohm loop |
| Maximum loop resistance | 1,000 ohms including cable at 35 Vdc; Rloop(max) = 43.5 x (Vps - 12) ohms |
| Not OK behavior | Output below 3.6 mA within 100 us; restores within 0.1 second after the fault clears |
| PROX OUT | Non-isolated; 10 kohm output impedance calibrated for a 10 Mohm load |
| Transducer-system Prox Out range | 0.25 to 1.65 mm (10 to 65 mil) with an AISI 4140 target |
| Transducer-system scale factor | 7.87 mV/um (200 mV/mil), +/-6.5% typical |
| Transmitter operating temperature | -35 to +85 deg C |
| Transmitter storage temperature | -51 to +100 deg C |
| Relative humidity | 100% condensing, non-submerged, with coaxial connectors protected |
| Transmitter weight | 0.43 kg (0.9 lbm) |
| Mounting | 35 mm DIN-rail clips |
| Agency option | Agency option not required |
| Adjustment note | Probe gap and centered range must be set per the installation instructions |
| Official source | 141618 Rev. R |
Compatibility statements are limited to the cited manufacturer documentation. Availability, condition and substitution must be confirmed separately.
991-25-70-01-00 is a Bently Nevada 991 two-wire, loop-powered thrust transmitter that provides a proportional 4-20 mA axial-position signal to a machinery control system.
991-25-70-01-00 is configured for the centered 25-0-25 mil range according to the first option field in the official 991 order table.
991-25-70-01-00 requires one compatible external 3300 NSv proximity probe and a matching extension cable for the configured 7.0 m system length.
991-25-70-01-00 is the thrust-transmitter order code; the compatible 3300 NSv probe and extension cable are external components unless the quotation for 991-25-70-01-00 explicitly includes them.
991-25-70-01-00 requires +12 to +35 Vdc at the transmitter and 991-25-70-01-00 supplies a two-wire 4-20 mAdc output proportional to shaft axial position.
991-25-70-01-00 drives the loop below 3.6 mA within 100 us after a Not OK condition and 991-25-70-01-00 restores the output within 0.1 seconds after the condition clears.
991-25-70-01-00 depends on the correct probe gap and centered-range adjustment; an incorrect setting can prevent 991-25-70-01-00 from reaching full scale in the normal or counter direction.
991-25-70-01-00 supports axial-position trending and loop alarming, but 991-25-70-01-00 does not provide the complete diagnostics and protection logic of a continuous machinery monitoring system.
Send the complete part number, installed-system details, quantity, destination and clear label photos. Availability and condition will be confirmed before quotation.
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