Manufacturer: Bently Nevada
Product No.: 991-25-70-01-00
Country of origin:United States
Product Type: 991 Thrust Transmitter
Barcode: 8537101190
Payment: T/T, Western Union
Weight: 430g
Dimensions: 100 mm x 74 mm x 53.3 mm
Shipping port: Xiamen
Warranty: 12 months
The Bently Nevada 991-25-70-01-00 is a two-wire, loop-powered thrust transmitter designed primarily for original equipment manufacturers (OEMs) of centrifugal air compressors, small pumps, motors, or fans. It accepts input signals from a 3300 NSv proximity probe and matching extension cable, transforming displacement data into a simple 4 to 20 mA proportional axial displacement (thrust) signal. This configuration enables seamless integration directly into a machinery control system, PLC, or DCS without requiring an external Proximitor sensor unit.
The device features non-isolated "PROX OUT" and "COM" terminals alongside a coaxial connector, providing a dynamic vibration and gap voltage signal output for machinery diagnostics and maintenance verification.
| Parameter | Specification |
|---|---|
| Manufacturer | Bently Nevada (Baker Hughes) |
| Model Number | 991-25-70-01-00 |
| Product Type | Thrust Transmitter |
| Country of Origin | United States (USA) |
| Full-Scale Range | 25-0-25 mils |
| System Length | 7.0 meters (23.0 feet) |
| Mounting Options | 35 mm DIN-rail clips |
| Agency Approvals | No hazardous area approvals required (-00 option) |
| Supply Voltage Range | 12 to 35 Vdc |
| Output Type | 4 to 20 mA DC proportional axial displacement |
| Proximity Range | 10 to 65 mils |
| Temperature Stability | Scale factor within plus/minus 10% of 7.87 mV/micrometer (200 mV/mil) from 0 degC to 70 degC |
| Transmitter Operating Temperature | -35 degC to +85 degC |
| Transmitter Storage Temperature | -51 degC to +100 degC |
| Signal Output Maximum Distance | 13 km (8 miles) maximum between transmitter and receiving device |
| Proximitor Output Distance | Maximum cable distance of 3 meters (10 feet) via BNC connector |
| Approximate Weight | 0.43 kg (unit only) / Shipping weight approx 2.00 lbs |
| Approximate Dimensions | 100 mm x 74 mm x 53.3 mm |
| Connector Pin / Terminal | Function |
|---|---|
| PROX OUT | Non-isolated dynamic transducer signal for diagnostics |
| COM | Common / Ground return reference point |
| SIG | 4 to 20 mA loop current signal output |
| PWR | Positive loop power supply input terminal |
| Coaxial Connector | Direct connection point for 3300 NSv probe matching extension cable |
Mount the transmitter using the pre-installed 35 mm DIN-rail clips. Ensure the rail is properly grounded and located in an area with minimal physical exposure to falling debris or direct process fluid leaks.
Always employ twisted, shielded pair cabling for the 4 to 20 mA loop connections. Connect the cable shield to the instrumentation ground at the control system or DCS side only. Do not ground the shield at both ends to avoid ground loop current errors.
Run the signal cables away from high-voltage AC power lines, electric motor feed cables, or switching relays to minimize EMI/RFI noise interference on the low-voltage 4 to 20 mA loop signal.
Set the initial probe gap using the "PROX OUT" and "COM" terminals to monitor the initial DC gap voltage. Verify that the physical distance between the probe tip and the target material places the output safely within the linear operation range of 10 to 65 mils.
What is the primary function of the Bently Nevada 991?
It converts raw proximity probe data into a standard 4 to 20 mA loop signal representing axial shaft displacement or thrust.
Which proximity probe family is compatible with this model?
This model is designed specifically to interface with the Bently Nevada 3300 NSv proximity probe series and matching extension cables.
What power supply is required to drive the transmitter loop?
The transmitter operates on a standard loop power supply ranging between 12 Vdc and 35 Vdc.
Can I read raw dynamic signals while the transmitter is running?
Yes, the transmitter includes a non-isolated BNC coaxial connector and PROX OUT terminals to capture dynamic gap and vibration signals for diagnostic analysis.
What mounting option does the 991-25-70-01-00 feature?
This configuration includes integrated 01-option mounting hardware suited for standard 35 mm DIN rails.
Global Express Shipping
Returns & Warranty
Global Express Shipping
Returns & Warranty
Orders are processed and delivered Monday-Friday (excluding public holidays).
For full eligibility, restocking fees, and international return details, please view our official Refund & Return Policy .
| Color pattern |
Greyish White
Black
|
| Country of origin |
United States
|
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