NXEXP300 Fireye Water Level Control

Overview

The Fireye Nexus NXEXP300 is a microprocessor-based expansion module designed to enhance the capabilities of the Nexus PPC6000 and NX6100 series of parallel positioning controls. This purpose-built module extends the functionality of industrial and commercial boiler monitoring systems by integrating water level supervision, draft control, and total dissolved solids (TDS) management into a single, compact unit. Its design allows for easy retrofitting into existing systems, contributing to safer and more efficient combustion control and boiler operation.

Features

• Expanded Digital Inputs: Provides 7 low-voltage and 2 line-voltage safety-rated digital inputs that can be configured to annunciate conditions or trigger boiler shutdowns.
• Boiler Water Level Control: Supports one, two, or three-element control via 4-20mA inputs, including feed pump VFD control and pump sequencing.
• Sequence Draft Control: Features built-in logic to control the boiler outlet damper through pre-purge, light-off, and operation to minimize standby and operating losses.
• TDS Management: Enables control of surface and bottom blowdown based on industry-standard TDS probe levels to maintain water quality and reduce scaling.
• Seamless Integration: Utilizes simplified four-wire CANbus interconnections for easy communication with Fireye servomotors and control platforms.
• Flexible Retrofitting: Designed with a small footprint and adjustable voltage settings for straightforward installation in existing HVAC and boiler facilities.

Specifications

• Model Number: NXEXP300
• Input Voltage: Adjustable 120/230V AC, 50/60 Hz
• Dimensions: 5 inches L x 8.5 inches W x 3.75 inches H
• Digital Inputs: 7 Low Voltage (safety rated), 2 Line Voltage (safety rated)
• Communication: CANbus interface
• Analog Interface: Supports 4-20mA field devices and RTD temperature sensors (PT100)
• Control Elements: Supports 1, 2, or 3-element water level control

Applications

The NXEXP300 is primarily used in industrial and commercial steam and hydronic boiler applications where precise monitoring and control are essential for safety and efficiency. It is ideally suited for facilities requiring automated water level management, sequence draft control to optimize combustion, and total dissolved solids monitoring to protect boiler components from scaling. It is commonly deployed in HVAC systems serving large-scale steam generation facilities and commercial heating equipment.