The Bently Nevada 991-06-70-03-01 is a metric-configured axial position transmitter from the 991 series, specifically engineered for thrust monitoring applications requiring SI units. This model provides a bi-polar measurement range of 0.6-0-0.6 mm, capturing both forward and reverse shaft displacement from a neutral reference point. It pairs with a single 3300 NSv proximity probe to generate a standardized 4-20 mA loop output. Furthermore, the 7.0-meter (23.0 feet) system length offers generous reach for machine installations. This version includes CSA Division 2 approval and features a dual mounting option with DIN clips and screws for enhanced installation flexibility.
The 991-06-70-03-01 delivers precise axial position data essential for thrust bearing protection in metric-system installations. Its primary function is to accept input from one non-contacting 3300 NSv proximity probe and extension cable, then condition that raw signal into a two-wire, 4-20 mA output.
Input: Accepts 1 non-contacting 3300 NSv Proximity Probe and extension cable.
Power Supply: Requires +12 to +35 Vdc input at the transmitter terminal.
Output Signal: 4 to 20 mAdc over the specified full-scale bi-polar range (0.6-0-0.6 mm).
Linear Range: 0.25 to 1.65 mm for Prox Out. Suitable for 0.6-0-0.6 mm or 25-0-25 mils current loop linear ranges.
Loop Accuracy: Within ±1.5% over the full-scale range (typical), measured from TEST signal to a 250 Ω load.
Maximum Loop Resistance: 1,000 Ω including cable at 35 Vdc.
Current Limiting: 23 mA typical.
Zero and Span: Non-interacting external adjustments for independent calibration.
This transmitter is built to perform reliably across extreme temperatures, making it suitable for demanding turbomachinery environments worldwide.
Mounting Option: 03 – DIN clips and screws for secure rail or panel installation.
System Length Option: 70 – 7.0 meters (23.0 feet) total cable length.
Transmitter Weight: 0.43 kg (0.9 lbm).
Operating Temperature: -35°C to +85°C (-31°F to +185°F).
Storage Temperature: -51°C to +100°C (-60°F to +212°F).
Agency Approval Option: 01 – CSA Division 2 for hazardous location use.
Proper installation is critical for achieving accurate thrust measurements and reliable operation. First, mount the Bently Nevada 991-06-70-03-01 using either the DIN clips for standard 35 mm rail installation or the included screws for panel mounting. Next, connect the 3300 NSv probe and its extension cable to the transmitter input. Then, carefully gap the probe tip between 0.25 and 1.65 mm from the target surface to achieve the full 0.6-0-0.6 mm bi-polar range.
For the output wiring, configure a 2-wire current loop with a DC power supply between +12 and +35 Vdc. Additionally, confirm that the total loop resistance—including cables and receiving instruments—does not exceed 1,000 Ω at 35 Vdc. The 991-06-70-03-01 provides non-interacting zero and span potentiometers, allowing you to set the 4 mA and 20 mA points independently. For metric bi-polar applications, 12 mA typically represents the neutral shaft position at 0 mm.
This transmitter includes a high-speed diagnostic circuit to enhance system reliability. When a fault condition occurs—such as a probe disconnect, cable break, or internal error—the output current drops below 3.6 mA within 100 µs. Consequently, your PLC, DCS, or safety system can immediately recognize the failure and initiate protective actions. Once the fault is cleared, the output automatically recovers within 0.1 seconds. This rapid restoration is particularly valuable in critical thrust monitoring applications where uninterrupted data is essential for machine protection.
1 x Bently Nevada 991-06-70-03-01 Thrust Transmitter
DIN clips and screw mounting hardware (included)
Installation and wiring instruction sheet
Please note: The 3300 NSv proximity probe, extension cable, and external power supply are not included and must be ordered separately.
All orders are dispatched via FedEx, UPS, or DHL to ensure fast, reliable delivery worldwide. Contact our sales team for current stock availability and shipping estimates.
1. What measurement range does the 991-06-70-03-01 provide?
This transmitter measures bi-polar axial displacement from -0.6 mm to +0.6 mm, with a neutral center at 0 mm. The 06 full-scale option defines this metric range, which is common in international installations using SI units.
2. Is the 991-06-70-03-01 approved for use in hazardous areas?
Yes. This model carries Agency Approval Option 01, which is CSA Division 2 certification. It is suitable for installation in Class I, Division 2 hazardous locations. Always verify local regulations and site-specific requirements before installation.
3. What is the difference between Mounting Option 03 and Option 01?
Mounting Option 01 includes only 35 mm DIN-rail clips, while Option 03 (used here) includes both DIN clips and screws. This dual option provides flexibility for either rail mounting or direct panel mounting with screws.
4. Can I use this transmitter with a 5.0m cable instead of 7.0m?
The 991-06-70-03-01 comes with System Length Option 70 (7.0 meters). For a 5.0-meter configuration, you would need a different model variant such as the 991-06-50-03-01. Contact us for alternative system length options.
5. How quickly does the output recover after a fault condition is resolved?
The "Not OK" signal defeat function restores normal output within 0.1 seconds after the fault is removed. This rapid recovery is a standard feature of the 991 series, minimizing data gaps and ensuring continuous monitoring.
| Brand Name | |
| Model No. | 991-06-70-03-01 |
| Product Type | Vibration Transmitter |
| hasMerchantReturnPolicy | Adjust according to reality |
| Shippingdetails | Adjust according to reality |
