Q&A | Ammonia Detector Testing and Calibration

Question: How often must ammonia detectors be calibrated?

Answer: It is often best to let the codes speak for themselves…

2013 CFC §606.1
Periodic Testing. The following emergency devices or systems shall be periodically tested in accordance with the manufacturer’s instructions and as required by the fire code official
1. Treatment and flaring systems.
2. Valves and appurtenances necessary to the operation of emergency refrigeration control boxes.
3. Fans and associated equipment intended to operate emergency ventilation systems.
4. Detection and alarm systems.

ANSI/ASHRAE 15-2013 §11.6.3
Periodic Tests. Detector(s), alarm(s), and mechanical ventilating systems shall be tested in accordance with manufacturers’ specifications and the requirements of the jurisdiction having authority.

ANSI/IIAR 2-2008 §13.2.5.1
The facility shall establish a time schedule for testing of the ammonia detectors and the alarm system. The manufacturer’s recommendations shall be followed or modified based on documented experience

ANSI/IIAR 2-2008 §13.2.5.2
Where no recommendations are provided, these devices shall be functionally tested on an annual basis.

As you can see from the references above ammonia detectors must be calibrated in accordance with manufacturers’ specifications. One popular sensor manufacturer is Drager. I’ve included their literature for DragerSensor NH3 LC below which recommends calibration every six (6) months.

 

The key is to obtain the manufacturer’s literature and follow the corresponding recommendations.