Bentley Nevada 990-04-XX-01-05 990 Vibration Transmitter

The 990 Vibration Transmitter is intended primarily for the original equipment manufacturers (OEMs) of centrifugal air compressors or small pumps, motors, or fans who prefer to provide a simple 4 to 20 mA proportional vibration signal as

the input to their machinery control system.

The transmitter is a two-wire, loop-powered device that accepts input from our 3300 NSv proximity probe and its matching extension cable (available in 5m and 7m system length options).

The transmitter conditions the signal into appropriate peakto-peak vibration amplitude engineering units, and provides this value as a proportional 4 to 20 mA industry-standard signal as the input to the control system where machinery

protection alarming and logic occurs†.

The 990 transmitter provides the following notable features:

1.Integrated Proximitor Sensor requires no external unit

2.Non-isolated "PROX OUT" and "COM" terminals plus a coaxial connector to provide a dynamic vibration and gap voltage signal output for diagnostics‡.

3.Non-interacting zero and span potentiometers under the Transmitter label supports loop adjustment.

4.Test Input pin for quick verification of loop signal output, using a function generator as the input.

5.A Not OK/Signal Defeat circuit prevents high outputs or false alarms due to a faulty proximity probe or loose connection.

6. Choice of DIN-rail clips or bulkhead mounting screws as standard options simplifies mounting.

7. Potted construction for high humidity (up to 100% condensing) environments. Compatibility with 3300 NSv proximity probe allows transducer installation in small areas with minimal clearance,typical of centrifugal air compressors.

990-AA-BB-CC-DD

A: Full-scale Option

04 0-4 mils pp (0-100 μm pp)

05 0-5 mils pp (0-125 μm pp)

08 0-8 mils pp (0-200 μm pp)

10 0-10 mils pp (0-250 μm pp)

B: System Length Option

50 5.0 meters (16.4 feet)

70 7.0 meters (23.0 feet)

C: Mounting Option

01 35 mm DIN rail clips

02 Bulkhead screws

03 DIN clips and screws

D:Agency Approval Option

00 Not required

01 CSA Division 2

05

CSA Division 2, ATEX Zone 0, ATEX

Zone 2 and includes ABS

maritime approval

990: This is the series number, specifically referring to the 990 Series condition monitoring system. This is a very classic and widely used modular monitoring system that can be configured with various monitoring cards.

-04: This typically indicates the slot number of the module within the chassis or a specific hardware version. In the 990 framework, different slots correspond to different functions.

-XX: Here, "XX" is the key variable, representing the specific module type. Different codes correspond to different functional modules. For example:

TX: Likely a Power Supply module.

CI: Likely a Communication Interface module.

VM: Likely a Vibration Monitoring module.

RK: Likely a Relay module.

DI, DO: Digital Input / Digital Output modules.

"XX" is a placeholder; the exact function of the module cannot be determined without the specific code.

-01: This usually indicates the channel number or a sub-module identifier. For multi-channel monitoring modules, this number distinguishes between different channels.

-05: This likely denotes the firmware version, hardware revision, or a specific configuration code.

In summary:

Bentley Nevada 990-04-XX-01-05 refers to a specific functional module used in the Bentley Nevada 990 Series condition monitoring system.