990-04-XX-01-CN MOD:165335-01 Bently Nevada Vibration Transmitter

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990-04-XX-01-CN MOD:165335-01 Overview

The 990-04-XX-01-CN MOD:165335-01 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 990-04-XX-01-CN MOD:165335-01 transmitter is a two-wire, loop-powered device that accepts input from our 3300 NSv proximity probe and its matching extension cable (available in 5 m and 7 m system length options).
The 990-04-XX-01-CN MOD:165335-01 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.

990-04-XX-01-CN MOD:165335-01 Parameters

Power Requirement: +12 to +35 Vdc input at the transmitter terminal
Output Signal: 4-20 mA proportional over specified full-scale range (2-wire configuration)
Full-scale Range: 25-0-25 mils (center zero for thrust position)
Loop Accuracy: Within ±1.5% over specified full-scale range (typical)
Maximum Loop Resistance: 1,000 Ω including cable at 35 Vdc
PROX OUT Scale Factor: 7.87 mV/μm (200 mV/mil) ±6.5% typical
PROX OUT Impedance: 10 kΩ output impedance calibrated for 10 MΩ load
Linear Range (Prox Out): 0.25 to 1.65 mm (10 to 65 mils)
Not OK/Signal Defeat: Output goes to <3.6 mA within 100 μs after Not OK condition
Operating Temperature (Transmitter): -35°C to +85°C (-31°F to +185°F)
Operating Temperature (Probe): -52°C to +177°C (-62°F to +351°F)

FAQ about 990-04-XX-01-CN MOD:165335-01

1. What does the MOD: 165335-01 designation indicate?

This modification number indicates compatibility with the 3300 XL 8mm proximity probe in a 9 meter system configuration. The datasheet specifies that this modification is for "3300 XL 8MM 9M" applications, confirming the unit is configured for use with the 3300 XL 8mm probe with a 9 meter total system length.

2. What does the "-CN" approval code indicate?

The "-CN" code indicates that this transmitter is certified for use in China with specific approvals from Chinese regulatory bodies, including CCC (China Compulsory Certification) and/or NEPSI (National Supervision and Inspection Center for Explosion Protection and Safety of Instrumentation) for hazardous location use.

3. What is the difference between mounting option 01 and 02?

Mounting option 01 provides 35 mm DIN rail clips for mounting on standard DIN rails. Mounting option 02 provides bulkhead screws for direct panel mounting. Option 03 includes both mounting methods.

4. What happens if the 990-04-XX-01-CN MOD:165335-01 probe gap is incorrect?

The probe must be gapped between 0.5 and 1.75 mm (20 and 55 mils) from the target to ensure accurate full-scale range operation. Operation outside this range may result in inaccurate readings or inability to achieve full-scale output.

5. How do I access the dynamic vibration signal for diagnostics?

The PROX OUT terminals and coaxial connector provide a non-isolated dynamic transducer signal. To safely connect this to AC-powered diagnostic equipment (oscilloscopes, analyzers), you must use the 990/991 Test Adapter (122115-01) , which provides isolation and corrects the signal phase inversion.

6.What does the "Not OK" condition look like on the 4-20 mA output?

During a Not OK condition (faulty probe, loose connection, etc.), the output signal will drop to less than 3.6 mA within 100 microseconds. This is distinct from a normal 4 mA reading at minimum vibration, allowing the control system to detect faults. During power-up, the output also stays below 3.6 mA for 2-3 seconds while the transmitter initializes.