Teledyne MX300-I manual Sensor, Signal Processing

Portable Oxygen Monitor Introduction

is illuminated on the LCD and the audible and visual alarms are activated whenever a fault is detected.

1.5.1 Sensor

The MX300-I uses the Teledyne Class R17MED disposable oxygen sensor. The sensor is made up of a sensing cathode and anode (fuel) immersed in electrolyte and packaged in a small plastic container. Oxygen entering the sensor reacts with the anode and a proportional current is collected at the sensing cathode, which is sent to the electronics where it is converted into a digital signal and displayed on the LCD Screen.

Attached to the R17MED sensor is a removable plastic diverter. This diverter is used to facilitate the transport of gas mixtures through the sensor. The diverter, packaged separately when shipped, is necessary when the tee adapter is used to sample gas flowing through a tube.

The diverter is not necessary and should not be used when the sensor is placed directly in a chamber, or when the sensor is used in confined volume monitoring, such as incubators and inhalation tents.

CAUTION: THE R17MED SENSOR CONTIANS A CAUSTIC ELECTROLYTE AND LEAD. DO NOT TRY TO OPEN THE SENSOR ASSEMBLY. CHECK THE SENSOR REGULARLY FOR LEAKS. IF THE SENSOR IS LEAKING, REPLACE IT. DO NOT TRY TO REPAIR IT. CONTACT TELEDYNE FOR THE MATERIAL SAFETY DATA SHEET RELATED TO HANDLING AND DISPOSAL.

CAUTION: REMOVE AND SAVE THE DIVERTER WHEN THE SENSOR IS USED IN CONFINED VOLUME APPLICATIONS.

1.5.2 Signal Processing

The electrical voltage developed in the sensor is sent to the electronics. Processing includes amplification, conversion to digits, and comparison to alarm set points if appropriate. Using a microprocessor allows for easier setting of alarms, automatic calibration, and self-diagnosis.

Teledyne Analytical Instruments 13