The BNB-342/EX is a high-precision, intrinsically safe input unit designed by Autronica for use in hazardous industrial environments. This module is primarily engineered to process 4-20mA analog signals from field transmitters, ensuring accurate data acquisition while maintaining strict safety compliance. It is a critical component in fire detection, gas monitoring, and process control systems, providing reliable galvanic isolation and signal conditioning to protect sensitive control equipment from electrical surges and fault conditions in the field.

Technical Specifications

• 📋 Model Name: BNB-342/EX
• 🏷️ Part Number: 116-P-BNB-342/EX
• 🏢 Manufacturer: Autronica Fire and Security
• 📏 Dimensions: 100mm x 75mm x 25mm (compact DIN-rail mountable)
• ⚖️ Weight: Approximately 0.25 kg
• 🌏 Origin: Norway
• ⚡ Operating Voltage: 24V DC nominal
• 📟 Input Signal: 4-20mA Analog Input
• 🛡️ Safety Rating: Intrinsically Safe (EX-rated) for use in hazardous zones

 

Frequently Asked Questions (Q&A)

What does the “/EX” designation signify in the model name? The /EX suffix indicates that this unit is certified as intrinsically safe, meaning it is designed to limit electrical and thermal energy to prevent ignition in explosive or flammable atmospheres.

Can I use the BNB-342/EX in a non-hazardous environment? Yes, while it is specifically built for hazardous zone applications, it is fully compatible with standard industrial setups that require robust, high-reliability signal isolation.

What is the primary application for this 4-20mA input unit? It is typically used to interface analog sensors (such as pressure, temperature, or gas detectors) with the central fire alarm or process control system, converting field signals into a format the control panel can process without risk of electrical feedback.

How does this module protect my control system? It provides galvanic isolation, which electrically separates the field instruments from the main control loop. This prevents ground loops and ensures that if a fault occurs in the field, the central system remains powered and unaffected.

What should I check if the module stops reporting values? Ensure the 24V supply is active and check the loop integrity for the 4-20mA signal. If the signal is present at the input but not reaching the output, verify the module’s internal fuse status or check for diagnostic error lights on the faceplate.

 

Recommended Series and Related Models

The following Autronica components are frequently paired with the BNB series for comprehensive system integration:

• BNB-310: Analog Addressable Interface
• BNB-330: Input/Output Unit
• BZ-500: Fire Alarm Control Panel (Master Unit)
• BHH-310: Multisensor Smoke Detector
• BN-304: Loop Controller Module
• AUTROSAFE 4: Integrated Fire & Gas System Controller
• BW-200: Barrier Interface Unit
• BNB-300: Standard Analog Interface
• B-400 Series: Addressable Fire Detectors
• AutroPoint: Gas Detection Sensor Series