Bently Nevada 990-05-70-01-00 Vibration Transmitter

Product Description

Bently Nevada 990-05-70-01-00  is a 990 series two-wire vibration transmitter with integrated proximitor sensor. It works together with the 3300 NSv narrow side-view eddy current proximity probe to form a complete vibration measurement system. The transmitter converts shaft radial vibration signals captured by NSv probe into standard 4-20mA analog signal for PLC/DCS input. Built-in Not OK fault detection circuit suppresses false outputs when probe wire breaks or short-circuits to prevent false alarms. Potted construction withstands high humidity up to 100% condensation. It supports DIN rail or bulkhead mounting. A dynamic signal output port is available for external vibration diagnostics. Widely used for OEM package and retrofit projects of centrifugal air compressors, small pumps, fans and other rotating machinery. Model codes define full scale, system cable length, mounting and certification options.

Specifications

• Model: 990-05-70-01-00
• Type: 990 Series Two-Wire Vibration Transmitter (Integrated Proximitor)
• Power Supply: 12~35VDC, 2-wire loop powered
• Compatible Sensor: 3300 NSv narrow side-view eddy current proximity probe
• Full Scale Range: 0~5 mil peak-to-peak (0~125 μm pp)
• Total System Cable Length: 5 meters
• Output Signal: 4~20mA DC proportional to vibration peak-to-peak value; PROX OUT dynamic diagnostic signal
• Frequency Response: 5Hz ~ 6kHz
• Fault Protection: Not OK signal defeat circuit, locks output during probe fault
• Mounting: 35mm DIN rail mount or bulkhead screw mounting
• Housing Construction: Potted encapsulation, high humidity resistant (100% condensing)
• Operating Temperature: -40℃ ~ +70℃
• Certifications: CE, ATEX, CSA
• Weight: Approx. 0.43kg
• Adjustment: Non-interactive zero and span potentiometers, with test input pin

Application

• Centrifugal Air Compressors: On-line radial vibration monitoring and interlock protection for compressor rotors
• General Industry: Shaft vibration monitoring for small centrifugal pumps, motors and fans
• OEM Equipment Package: Condition monitoring transmitter unit for packaged machinery
• Petrochemical & Oil-Gas: Simplified vibration protection for auxiliary rotating equipment
• Power Plant Auxiliaries: Vibration monitoring retrofit for induced draft fans, boiler feed pumps
• Legacy Equipment Retrofit: Replace old separate proximitor and transmitter modules to simplify wiring

990 / 991 Series Models

1. 990-05-50-01-00: 990 Vibration Transmitter, 5m system length, 0~5mil range
2. 990-05-50-02-00: 990 Vibration Transmitter, 7m system length, 0~5mil range
3. 990-05-100-01-00: 990 Vibration Transmitter, 5m system length, 0~10mil range
4. 991 Series: Thrust displacement transmitters (axial shaft position monitoring, same platform)
5. 990-05-50-01-CN: China version of 990 vibration transmitter