BENTLY 3500/53M Electronic overspeed detection module

The BENTLY 3500/53M is an electronic overspeed detection module manufactured by Bently Nevada, and it belongs to the BENTLY 3500 Series product lineup. Below is its detailed information:

1. Product Overview

This module detects rotational speed changes of rotating machinery, enabling early identification of various faults such as unbalance, misalignment, bearing wear, and gear defects. It thereby achieves equipment protection and prevents unplanned downtime.

2. Technical Parameters

Input Signal: Each module receives signals from one eddy current sensor or magnetic sensor. The input signal range is +10.0V to -24.0V, with an input impedance of 20kΩ.
Measurement Range: Maximum full-scale range is 99,999 rpm (revolutions per minute).
Accuracy:
- ±0.1 rpm when speed is less than 100 rpm;
- ±1 rpm when speed is between 100 rpm and 10,000 rpm;
- ±0.01% when speed is between 10,000 rpm and 99,999 rpm.
Frequency Response:
- The speed input supports 1 to 255 events per revolution;
- Maximum input frequency: 20 kHz;
- Minimum input frequency: 0.0167 Hz for eddy current sensors, 3.3 Hz for magnetoelectric sensors.
Power Supply Voltage: Not explicitly specified, but typically, modules in the 3500 Series use a 24V DC power supply.
Output Signal: Includes relay outputs, analog outputs, etc.
- Relays: Single-pole double-throw (SPDT) relays, epoxy-sealed;
- Contact rating: Maximum switching power (DC) 120W, maximum switching current 5A, maximum switching voltage (DC) 30V / (AC) 250V.
Operating Temperature Range: -30°C to +65°C.
Storage Temperature: -40°C to +85°C.
Power Consumption: Typical value is 8.0W.

3. Product Features

High Precision: Adopts next-generation digital technology, providing high-precision speed detection capability.
High Reliability: Suitable for various harsh industrial environments; can be configured into 2-out-of-2 or 3-out-of-2 voting systems to enhance system reliability and stability, with functional safety meeting SIL 2 standards.
Fast Response: Can respond quickly to mechanical overspeed events, protecting equipment from damage.