Ammonia Gas Sensor

Ammonia Gas Sensor

Designed to detect ammonia levels ranging from 1ppm (30 times below the point at which ammonia can be smelled) to 5+ ppm, this sensor will consistently provide the protection needed to ensure a safe, ammonia-free environment. It is constructed with a state-of-the-art, colored membrane, which changes from a canary-yellow to a deep-blue color in the presence of ammonia. Because the ammonia diffuses into and through the membrane, it does not physically change the membrane, allowing the sensor to be used repeatedly. Note – reversion to its baseline color (canary-yellow) can take an unspecified amount of time depending on conditions (e.g. variables such as the concentration and duration of ammonia exposure, air circulation, temperature).

Key Features
  • Reliable – no false positives
  • Visual indication – easy to install and use (no tools or special equipment/knowledge required)
  • Continuous monitoring
  • Unaffected by ethylene, propane, carbon dioxide, oxygen, nitrogen and many other gases commonly found in cold-storage environments
  • Humid environments will not affect performance
  • Reusable – repeat testing capability
  • Reacts to ammonia at concentrations below the detection threshold of many other sensor instruments, while capable of withstanding extremely high levels of ammonia

Simply mount the sensor in a window or viewing portal where room-air can freely circulate on and around the card’s exposed membrane. Double-sided tape can be used to attach the card directly to a clean, dry window, or alternatively, a clip or strap can be used to affix the card to a support.

Handling, Care, Use Life

Avoid touching the exposed membrane with oily hands, alcohols, and/or solvents. The rated use-life of the sensor is one year, however, long-term exposure to bright light sources, such as sunlight or high-intensity lamps may reduce this. Expiration date is provided on the back of sensor. Note – some cleaning solutions, paints, epoxies, and cigarette smoke, contain ammonia or ammonia-related compounds can result, as expected, in a color response by the sensor when exposed to sufficient vapors or fumes.



  • Operating temperature: -20°F to +120°F
  • Operating humidity: 15-100% relative humidity, including condensing conditions


  • Height: 2 3/4″
  • Width: 2 3/4″
  • Thickness: 1/32″

Low-level leaks may signal that a larger leak is developing, and long-term exposure at low levels can be just as damaging to products as major leaks. Many current detection systems are plagued by non-functioning sensors and false alarms – expensive errors that can cause you to unnecessarily compromise your CA environment and/or risk product loss.

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Ordering Information

Buy your sensors online by clicking the “add to cart” button on the Products page or call (425)-229-9701 and talk directly to a representative to place an order. Custom fabrication requests are also welcomed; call or email for details. We will gladly work with you to design the best solution that meets your needs.

Shipping & Handling
in the United States

Products will be shipped within 2-4 business days. Ground shipping usually takes 3-5 days depending on shipping destination.

International Shipping
(Including Canada)

International shipping and handling depends on the specific country. Please email Customer Service at with your shipping address, product of interest and desired quantity. A shipping estimate will then be provided.

Our Return Policy

If you are not satisfied with our product for any reason, please return it within 14 days of receipt for full refund.

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