Model 111

The AMI 111 series provide the ideal solution to percentage oxygen measurement in non-flammable gases. Most portable percent oxygen analyzers use replaceable electrochemical sensors, which suffer from drift, temperature and barometric pressure sensitivity, and require frequent replacement.

This series of analyzers uses a non-depleting zirconium oxide sensor to measure. The sensor requires no support gases, and generates an almost perfectly stable reading with minimal drift for months or years. It is not significantly affected by temperature changes, or by barometric pressure changes. It will last for many years without being replaced. When you need an accurate oxygen measurement in an inert background, this series is unique.

There are three versions of the model 111. The basic model expects a positive pressure of at least a few inches of water column, up to a maximum of 100psig. The 111P version contains a pump that draws the sample from a low pressure source, such as a glove box at atmospheric pressure or a line at a partial vacuum. It can draw from vacuums of up to 10”Hg.

The 111B is intended for aerospace applications, particularly verifying the operation of aircraft inerting systems. It also uses a pump, but brings the sample to the sensor via flame arrestors so that if the sample is flammable (for example containing jet fuel vapors) any ignition would not travel back to the source, or onward to the exhaust.

All the 111 series are packaged in a welded steel case. These are industrial strength analyzers that are expected to work in harsh environments with minimal care and attention.

They support the standard AMI datalogger functionality, which is to say that they store up to 15 days of readings that are accessible through the USB port to the AMI software running on a PC. The internal batteries will last about 8 hours (1 hour for the 111P with the pump running) although the unit can be operated indefinitely if it is charged while it is running.