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Key Technical Specifications

This Bently Nevada 990-04-50-01-00 transmitter operates from a 24V DC loop-powered supply. It measures machine vibration and converts it to a 4-20mA signal. The unit measures 12 cm in length, 6 cm in width, and 4 cm in height. Its total weight equals 0.35 kg without any packaging materials.

The Bently Nevada 990-04-50-01-00 includes one internal accelerometer and one signal conditioner. Additionally, it features one 2-wire terminal block for loop connection. A single mounting stud attaches the transmitter to machinery. The unit contains 1 accelerometer, 1 signal conditioner, 1 current loop driver, 4 resistors, and 3 capacitors.

Bently Nevada 990-04-50-01-00 stores minimal energy using one ceramic capacitor. This capacitor provides 10 µF at 35V rating for signal filtering. Consequently, the transmitter rejects high-frequency noise from industrial environments. Therefore, vibration readings remain stable and accurate.

Design and Integration

This vibration transmitter uses hermetically sealed stainless steel housing for harsh environments. Consequently, the Bently Nevada operates reliably from -40°C to +85°C ambient temperature.

For installation, you need a 1/4-28 UNF threaded hole on the machine surface. The transmitter draws 20 mA maximum loop current at full scale. The output signal requires a minimum loop supply voltage of 12V DC. We recommend using shielded twisted-pair cable for the 4-20mA loop connection.

Practical Application

This 990 vibration transmitter monitors bearing and casing vibration on rotating machinery. It provides a direct 4-20mA signal to a PLC or DCS system. The Bently Nevada 990-04-50-01-00 detects early signs of imbalance, misalignment, and bearing wear. Therefore, it enables predictive maintenance for pumps, fans, and compressors.

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