Bently Nevada 991-06-70-01-05 Thrust Transmitter

991-06-70-01-05 Bently Nevada Thrust Transmitter

Product Introduction 991-06-70-01-05

The Bently Nevada 991-06-70-01-05 is a reliable thrust transmitter designed for axial vibration and position monitoring. This model features a 0.6-0-0.6 mm full-scale range, a 7.0-metre system length, and convenient 35 mm DIN-rail mounting clips. It accepts a non-contacting 3300 NSv proximity probe and extension cable, converting the signal into a standard 4-20 mA output. Manufactured in the U.S.A., this transmitter carries multiple agency approvals including CSA Division 2, ATEX Zone 0, ATEX Zone 2, and ABS maritime approval. Furthermore, it is ideal for critical turbomachinery protection.

Technical Specifications 991-06-70-01-05

The Bently Nevada 991 transmitter operates with a 4-20 mA output signal in a 2-wire configuration. Its full-scale range option -06 provides a 0.6-0-0.6 mm linear range, suitable for axial position monitoring. The system length option -70 specifies a 7.0-metre (23.0 feet) cable length. Additionally, the linear range spans from 0.25 to 1.65 mm for Prox Out, making it compatible with 0.6-0-0.6 mm or 25-0-25 mils current loop linear ranges.

The 991-06-70-01-05 offers exceptional accuracy. Loop accuracy is within ±1.5% over the specified full-scale range, rated from the TEST signal input to the voltage measured across a 250 Ω loop resistance. The maximum loop resistance reaches 1,000 Ω including cable at 35 Vdc, and current limiting is set at 23 mA typical. Moreover, the transmitter provides non-interacting external zero and span adjustments for easy calibration.

Not OK / Signal Defeat Function 991-06-70-01-05

The Bently Nevada 991 includes a critical safety feature. The signal output drops to less than 3.6 mA within 100 µs after a Not OK condition occurs. Furthermore, the signal output restores within 0.1 seconds after the Not OK condition is removed. This rapid response ensures machine protection during fault conditions.

Environmental and Mechanical Ratings

This 991-06-70-01-05 transmitter operates reliably in demanding environments. The operating temperature range extends from -35°C to +85°C (-31°F to +185°F) , while the storage temperature ranges from -51°C to +100°C (-60°F to +212°F) . The transmitter weighs only 0.43 kg (0.9 lbm) and mounts easily on a standard 35 mm DIN rail using the included clips.

Hazardous Area Approvals and Compliance

The 991-06-70-01-05 carries comprehensive hazardous area certifications. It is approved for CSA Division 2, ATEX Zone 0, and ATEX Zone 2 installations. Additionally, it includes ABS maritime approval, making it suitable for offshore and marine applications. These approvals make the Bently Nevada 991 a versatile choice for global installations.

Installation Guidelines

Installing the 991-06-70-01-05 requires proper power supply and loop resistance considerations. The transmitter requires +12 to +35 Vdc input at the transmitter terminal. For optimal performance, ensure the loop resistance does not exceed 1,000 Ω including cable at 35 Vdc. The zero and span adjustments are non-interacting, allowing independent calibration. Mount the transmitter securely on a 35 mm DIN rail using the supplied clips.

Packaging List

The product package for the Bently Nevada 991-06-70-01-05 includes the following items:

• Thrust transmitter unit

• 7.0-metre system cable (attached)

• 35 mm DIN-rail mounting clips

• Installation and calibration guide

• Terminal block connectors

Frequently Asked Questions

1. What probe types work with the Bently Nevada 991-06-70-01-05?

This transmitter accepts a non-contacting 3300 NSv Proximity Probe with a compatible extension cable. It supports the 0.6-0-0.6 mm linear range.

2. What output signal does this 991 transmitter provide?

The 991-06-70-01-05 provides a standard 4-20 mA output signal in a 2-wire configuration, proportional to the axial position measurement.

3. Can this transmitter be used in hazardous areas?

Yes, the Bently Nevada 991 carries CSA Division 2 and ATEX Zone 0 & Zone 2 approvals, making it suitable for hazardous locations.

4. What happens during a Not OK condition on this transmitter?

The signal output drops to less than 3.6 mA within 100 µs after a Not OK condition. The signal restores within 0.1 seconds after the fault clears.

5. What shipping carriers do you use for this product?

We ship the Bently Nevada 991-06-70-01-05 using FedEx, UPS, or DHL for fast and reliable delivery worldwide.