Bently Nevada 3300/48-01-01-01-00 | Case Expansion Monitor

3300 Series Single-Channel Case Expansion Monitor

The 3300/48-01-01-01-00 provides dedicated case expansion monitoring for rotating machinery protection. This module measures thermal growth and casing deformation in turbines and large compressors. It processes input from a single proximity probe and compares it against configurable setpoints. The device then activates the appropriate relay outputs when the expansion exceeds safe limits.

Key Technical Specifications

Parameter	Specification
Model	3300/48-01-01-01-00
Series	3300 Series
Function	Single-channel case expansion monitor
Input Type	Accepts one proximity probe signal
Power Supply	Requires +24 Vdc at 150 mA nominal
Output Relays	Includes two alarm relays and one danger relay
Measurement Range	Spans from -24 Vdc to 0 Vdc input
Frequency Response	Covers DC to 10.0 kHz range
Input Impedance	Provides 100 kΩ input impedance
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 1.2 kg
Mounting	Fits standard 19-inch rack enclosures
Termination	Uses pluggable screw terminal blocks
LED Indicators	Displays OK, ALERT, and DANGER status

Case Expansion Monitoring and Protection

This monitor continuously tracks casing expansion relative to the machine’s rotor. It then triggers the alarm relay when the displacement reaches the first threshold. Subsequently, the danger relay activates if the expansion reaches the critical limit. The device provides a buffered output for external recording or diagnostic systems. This module effectively prevents damage from excessive thermal growth in critical machinery.

Installation and Configuration

First, insert the 3300/48-01-01-01-00 into an available slot within the chassis. Next, connect the proximity probe cable to the designated input terminal. After that, apply +24 Vdc power and confirm the OK LED illuminates. You can then configure the alarm setpoints using the front-panel adjustment potentiometers. Finally, set the appropriate time delay to avoid false trips during warm-up.

Maintenance and Operational Integrity

This module stores all configuration data in non-volatile memory. Therefore, a power interruption will not erase your programmed settings. We recommend you perform periodic calibration verification on the input channel. You should also inspect the terminal connections for tightness during routine maintenance checks.