Bently Nevada 990-05-70-02-00 990 Series Vibration Transmitter

Product Overview

The Bently Nevada 990-05-70-02-00 provides a streamlined solution for machinery protection by converting radial vibration into a proportional 4-20 mA DC signal. Primarily designed for OEMs of centrifugal air compressors, small pumps, and motors, this transmitter integrates the proximitor and signal conditioner into a single unit. It eliminates the need for external racks, allowing direct input into a PLC or DCS. We supply this unit as 100% brand new and original equipment.

Part Number Breakdown

The 990-05-70-02-00 model utilizes a specific configuration to match 7-meter probe systems:

Technical Specifications

This transmitter delivers precise signal conditioning under extreme industrial conditions:

• Output Signal: 4 to 20 mA DC (Proportional to vibration amplitude).

• Operating Temp (Transmitter): -35°C to +85°C (-31°F to +185°F).

• Operating Temp (Probe): -52°C to +177°C (-62°F to +351°F).

• Probe Tip Material: Polyphenylene sulfide (PPS).

• Probe Case Material: AISI 303 or 304 Stainless Steel (SST).

• Cable Type: 75Ω coaxial, Fluoroethylene Propylene (FEP) insulated.

• Weight: 0.43 kg (Transmitter only); 0.82 kg (Typical system total).

• Relative Humidity: 100% condensing (non-submerged).

Engineering Advantages

• Seamless OEM Integration: The 4-20 mA loop-powered design reduces the complexity of machinery control systems. This allows manufacturers of small pumps and fans to implement vibration monitoring without installing high-cost, specialized hardware racks.

• Rugged Construction: The probe utilizes a PPS tip and Stainless Steel casing, which resists chemical corrosion and high-temperature exposure. This ensures long-term stability when installed inside high-speed centrifugal compressors.

• High Tensile Integrity: The interface between the probe case and lead withstands up to 222 N (50 lbf) of tension. This prevents signal loss during installation through tight conduit paths or areas with significant physical vibration.

• Direct-to-DCS Monitoring: By conditioning the signal locally, the 990-05-70-02-00 minimizes the risk of signal interference over long field wiring runs. The low-impedance 4-20 mA loop maintains high data integrity in noisy electrical environments.

FAQs

• Can I use a 5-meter probe with this 990-05-70-02-00 transmitter?

  No. This transmitter is calibrated specifically for a 7.0-meter system length. Using a 5-meter cable will result in a scale factor error and inaccurate vibration readings.

• Does this unit require an external power supply?

  The unit is loop-powered, typically drawing power from the 24V DC supply of the PLC or DCS analog input card. You do not need a separate power source for the transmitter.

• What is the benefit of the Bulkhead Mounting (02 option)?

  The bulkhead mounting option provides a flat-surface securement method, ideal for mounting directly onto machine skids or inside custom junction boxes where DIN rails are not available.

• Is the probe included in this part number?

  The 990-05-70-02-00 refers to the transmitter unit. You must order the 3300 or 3300 XL 8mm probe and extension cable separately, ensuring the total length matches the 7.0-meter requirement.