Check the listing for details. Ammonia Sensor (NH3 Sensor) NH3-B1. Condition: New. Listed at 292.25 USD. The NH3-B1 ammonia sensor is a highly reliable and accurate device for detecting ammonia gas. This sensor is designed for industrial use, and is ideal for monitoring ammonia levels in refrigeration systems, chemical plants, and other industrial environments. Featuring a compact design and easy installation process, the NH3-B1 sensor is a great addition to any industrial monitoring system. Its advanced sensing technology ensures accurate and reliable results, and it is built to withstand harsh industrial environments. Whether you're looking to monitor ammonia levels for safety or compliance reasons, the NH3-B1 sensor is a top choice for industrial professionals.