991-06-70-01-00 Bently Nevada Probe Vibration Transmitter

Bently Nevada 991-06-70-01-00 Thrust Transmitter

Product Introduction

The Bently Nevada 991-06-70-01-00 provides precise axial position monitoring for rotating machinery. This transmitter measures shaft movement relative to a bearing housing with high accuracy. It accepts input from a 3300 NSv Proximity Probe and its matching extension cable. The device then converts this signal into a reliable 4 to 20 mAdc loop output. This output is linearly proportional to the thrust position.

Technical Specifications

This transmitter delivers consistent and reliable data in demanding industrial settings. It operates as a 2-wire loop-powered instrument. The 991-06-70-01-00 needs a DC supply voltage between +12 and +35 Vdc at its terminals. Typical loop accuracy reaches within ±1.5% of the full-scale range. Specifically, this accuracy rating applies from the TEST signal input to the voltage across a 250 Ω loop resistor. The device's linear output spans from 0.25 to 1.65 mm. Therefore, it suits current loop linear ranges of either 0.6-0-0.6 mm or 25-0-25 mils.

Moreover, the transmitter includes several protective features. For instance, the output signal drops to less than 3.6 mA within 100 µs after a Not OK condition occurs. Additionally, the signal automatically restores within 0.1 seconds after the fault clears. This model offers non-interacting external adjustments for zero and span. Consequently, these adjustments significantly simplify the calibration procedure. The maximum loop resistance reaches 1,000 Ω, including the cable, at 35 Vdc. Furthermore, the device provides typical current limiting at 23 mA.

Environmental and Mechanical Limits

The Bently Nevada 991 series transmitter performs reliably across a wide temperature spectrum. Its operating temperature ranges from -35°C to +85°C. Meanwhile, the storage temperature spans from -51°C to +100°C. This thermal tolerance ensures stable operation in challenging environments. The unit weighs approximately 0.43 kg. It uses 35 mm DIN-rail clips for mounting. This mounting option facilitates quick and secure installation in standard control cabinets.

Agency Approvals and Installation

This particular model carries an Agency Approval Option of 00. Hence, it does not require special hazardous area certifications for general-purpose use. This makes the 991-06-70-01-00 a cost-effective solution for applications without strict regulatory demands. The system length option extends to 7.0 meters, providing flexibility for sensor placement.

During installation, ensure the power supply matches the required +12 to +35 Vdc range. Also, verify that the total loop resistance does not exceed 1,000 Ω. This step guarantees accurate signal transmission. The device accepts one non-contacting 3300 NSv Proximity Probe. It also integrates seamlessly with the corresponding extension cable.

Packaging and Shipping

We package the Bently Nevada 991-06-70-01-00 securely to prevent transit damage. The standard package includes the transmitter unit and the necessary DIN-rail mounting clips. However, this package does not include the proximity probe or extension cable. It also does not include certificates or warranty documentation. We ship all orders via leading global couriers. Therefore, we use FedEx, UPS, or DHL to ensure fast and reliable delivery worldwide.

Frequently Asked Questions (FAQ)

1. What is the full-scale range of the 991-06-70-01-00?
The Bently Nevada 991-06-70-01-00 has a full-scale option of -06, which corresponds to a bidirectional range of 0.6-0-0.6 mm.

2. What power supply does this transmitter require?
This device requires a DC power source. Specifically, you need to supply between +12 and +35 Vdc at the transmitter terminal.

3. How does the output behave during a system fault?
The output signal will drop to less than 3.6 mA immediately after a Not OK condition occurs. It will remain at this level until the system resolves the fault.

4. Does this model have hazardous area approvals?
No, it does not. The 991-06-70-01-00 has an Agency Approval Option of 00, indicating its design for general-purpose use without special certifications.

5. What is the maximum loop resistance for this transmitter?
The maximum allowable loop resistance is 1,000 Ω. This limit includes the total resistance of the cable at 35 Vdc.