An ammeter is a measuring instrument used to measure the flow of electric current in a circuit. Electric currents are measured in amperes, hence the name. The word ammeter is commonly misspelled or mispronounced as ampmeter by some.The earliest design is the D'Arsonval galvanometer or moving coil ammeter. It uses magnetic deflection, where current passing through a coil causes the coil to move in a magnetic field. The voltage drop across the coil is kept to a minimum to minimize resistance across the ammeter in any circuit into which the it is inserted.To measure larger currents, a resistor called a shunt is placed in parallel with the meter. Most of the current flows through the shunt, and only a small fraction flows through the meter. This allows the meter to measure large currents. Traditionally, the meter used with a shunt has a full-scale deflection (FSD) of 50mV, so shunts are typically designed to produce a voltage drop of 50mV when carrying their full rated current.

Ammonia (NH3) monitors is a microprocessor-based analyzer. It is used as an ammonia ion-selective probe. This compact, self-contained analyzer provides effective measurements of ammonia in sewage treatment, rivers, potable water treatment, boiler feed water and industrial effluents. It is a ammonia measurement device. It achieves better than 1 ppb detection of ammonia in ambient air. It advances detection limit and measurement speed to enable real-time monitoring of airborne ammonia in lithography areas.

Ammonia Flares are of two general types. They are emergency and process. Operation of the flare only occurs in the event of refrigeration failure or power failure.