Bently Nevada 3300/50 Tachometer Module

Speed Measurement for Rotating Machinery

The Bently Nevada 3300/50 tachometer module provides precise speed measurement for critical rotating equipment. This module accepts input signals from proximity probes, magnetic pickups, or optical sensors. It delivers reliable speed readings for steam turbines, gas turbines, and large compressors. The system supports both digital and analog output formats for versatile integration.

Technical Specifications

Parameter	Specification
Model Number	3300/50
Brand	Bently Nevada
Category	Tachometer Module
Channels	1 or 2 (depending on configuration)
Input Types	Proximity probe, magnetic pickup, optical sensor
Input Range	+10.0 V to -24.0 V
Speed Range	1 RPM to 100,000 RPM
Accuracy	±0.1% of reading
Frequency Range	0.1 Hz to 100 kHz
Output Signals	4-20 mA, pulse train, or relay contact
Alarm Setpoints	2 programmable
Display	Local speed readout
Power Consumption	5.0 W maximum
Operating Temperature	-30°C to +65°C
Dimensions (HxWxD)	241.3 x 24.4 x 241.9 mm
Weight	0.82 kg
Country of Origin	USA

Flexible Input Sensor Support

This module accommodates various sensor types for diverse application requirements. Proximity probes work well for gear tooth or key phasor speed detection. Magnetic pickups provide reliable speed signals from ferrous targets without external power. Optical sensors enable non-contact measurement in clean environments. Therefore, you can select the ideal sensor for each specific installation.

High-Precision Speed Measurement

The internal circuitry delivers ±0.1% reading accuracy across the entire speed range. This precision ensures trustworthy speed data for critical control and protection functions. The module covers speeds from 1 RPM to 100,000 RPM for broad equipment coverage. Additionally, the frequency range from 0.1 Hz to 100 kHz captures both very slow and very fast rotating machinery.

Dual Output Configuration

The module provides 4-20 mA analog output for continuous speed indication. A separate pulse train output transmits speed data to control systems. Relay contacts offer direct trip and alarm capabilities without external logic. Consequently, this tachometer supports multiple integration approaches for different system architectures.

Programmable Alarm Setpoints

Two independent alarm setpoints allow flexible trip and warning configurations. You can program each setpoint for high speed, low speed, or rate-of-change conditions. This programmability enables customized protection strategies for various machinery types. The module stores setpoint values in non-volatile memory for reliable operation after power cycles.

Rugged Industrial Design

This module withstands harsh conditions typical of power plants and refineries. Its wide operating temperature range from -30°C to +65°C suits demanding environments. The compact 241.3 mm height and 24.4 mm width simplify installation in space-limited panels. Moreover, the lightweight 0.82 kg design facilitates easy handling and maintenance.