Gas & flame detection in refrigeration facilities

Detect Ammonia Gas Leaks & Fires

Refrigeration facilities in the food and beverage industry keep food cool for long periods of time. These facilities often use ammonia-based cooling systems, as ammonia is efficient and economical for large-scale food processing and storage. Ammonia is flammable if released in an enclosed space, with a source of ignition present, or if a vessel of anhydrous ammonia is exposed to fire. It is also highly toxic above 500 parts per million (ppm). Gas detection and monitoring systems must be in place to detect the presence of ammonia before it reaches dangerous concentration. The Rosemount™ 936 Open Path Toxic Gas Detector provides continuous monitoring for ammonia gas and has long range detection up to 200 ft (60 m). Rosemount 975HR flame detectors can detect hydrocarbon-based fuel and gas fires at long distances with a high immunity to false alarms.

Rosemount 936 Open Path Toxic Gas Detector

The Rosemount 936 Open Path Toxic Gas Detector provides continuous monitoring for hydrogen sulfide (H₂S) gas or ammonia (NH₃) gas, even in harsh environments where dust, fog, rain, snow or vibration can cause a high reduction of signal. This toxic gas detector utilizes ultraviolet technology and has long range detection up to 200 ft (60 m). Worldwide approvals for the Rosemount 936 Open Path Toxic Gas Detector include ATEX, IECEx, FM/FMC, INMETRO, TR CU, and SIL 2 (TÜV).

Product features include: high immunity to false alarms; heated optics for use in extreme environments; and built-in data logger (records up to 100 events).

Specifications include: Time Constant / Response T90 ≤ 10 Seconds; Sensitivity Range 0–500 ppm.m; and Spectral Response 200–300nm.

Rosemount™ 975HR Multi-Spectrum Infrared Hydrogen Flame Detector

The Rosemount 975HR Multi-Spectrum Infrared Hydrogen Flame Detector is specifically designed for the detection of hydrocarbon and hydrogen flames. It detects hydrocarbon-based fuel and gas fires at long distances with a high immunity to false alarms. The Rosemount 975HR Flame Detector is a durable and weather resistant hydrogen flame detector. This flame detector includes a heated window to eliminate condensation and icing, HART™, lower power requirements and a compact lighter design.

Product features include: Multi spectrum design for detection of hydrocarbons and hydrogen flames with high false alarm immunity; Six sensitivity levels, adapting to any application; and high speed response time under 20 msec.

Specifications include:

Communication Protocol

Optional HART communications on the 0–20 mA analog current (FSK) — used for maintenance, configuration changes and asset management, available in mA source output wiring options. RS-485 Modbus compatible communication link that can be used in computer controlled installations

Ambient Temperature

• Operating & Storage: -76 °F to +185 °F (-60 °C to +85 °C)

Enclosure Rating

• Stainless Steel 316L with electro polish finish
• Heavy duty copper free aluminum (less than 1%), polyurethane painted

Top image credit: iStock.com/AleksandarGeorgiev