Bently Nevada 3300/45-02-02-03-00 | Differential Expansion

3300 Series Single-Channel Differential Expansion Monitor

The 3300/45-02-02-03-00 provides precise differential expansion monitoring between rotor and stator in rotating machinery. This module measures the relative thermal growth between a turbine’s rotating shaft and its stationary casing. It processes input from two proximity probes and calculates the expansion difference continuously. The device then activates the appropriate relay outputs when the differential exceeds safe limits.

Key Technical Specifications

Parameter	Specification
Model	3300/45-02-02-03-00
Series	3300 Series
Function	Single-channel differential expansion monitor
Input Type	Accepts two proximity probe signals
Power Supply	Requires +24 Vdc at 180 mA nominal
Output Relays	Includes two alarm relays and one danger relay
Measurement Range	Spans from -24 Vdc to 0 Vdc per input
Frequency Response	Covers DC to 10.0 kHz range
Input Impedance	Provides 100 kΩ impedance per channel
Alarm Setpoints	Offers independently configurable thresholds
Time Delay	Adjustable from 0.1 to 10.0 seconds
Operating Temperature	Functions from -20°C to +65°C
Storage Temperature	Withstands -40°C to +85°C
Dimensions	Measures 241.3 mm x 25.4 mm x 152.4 mm
Weight	Weighs approximately 1.3 kg
Mounting	Fits standard 19-inch rack enclosures
Termination	Uses pluggable screw terminal blocks
LED Indicators	Displays OK, ALERT, and DANGER status

Differential Expansion Monitoring and Protection

This monitor continuously calculates the difference between two independent proximity probe inputs. It then triggers the alarm relay when the differential reaches the first threshold. Subsequently, the danger relay activates if the expansion gap reaches the critical limit. The module provides a buffered output representing the differential value for external systems. This device helps prevent costly rotor-stator contact during thermal transients.

Installation and Configuration

First, insert the 3300/45-02-02-03-00 into an available slot within the chassis. Next, connect both proximity probe cables to the designated input terminals. After that, apply +24 Vdc power and verify the OK LED illuminates. You can then configure the alarm setpoints using the front-panel adjustment potentiometers. Finally, set the appropriate time delay to prevent nuisance trips during startup.

Maintenance and Operational Integrity

This module retains all configuration data in non-volatile memory. Therefore, a power cycle will not erase your programmed settings. We recommend you perform periodic verification of both probe input channels. You should also inspect the terminal connections for any signs of loosening or corrosion.