Detcon DM-534C - Manual (Page 7)

DM-534C Oxygen Sensor Assembly
DM-534C O2 Sensor Instruction Manual Rev. 1.4 Page 3 of 18
Figure 4 Explosion proof enclosures
2.0 PRINCIPLE OF OPERATION
Method of detection is by a controlled rate of diffusion. Air and gas diffuse through a sintered stainless steel
filter and a diffusion barrier. As oxygen is adsorbed into the electrolyte solution a current is generated between
the cathode and anode electrodes. This current output rises with increases in oxygen concentration and
reverses with lower concentrations. The quick response of the cell results in continuous monitoring of ambient
air conditions.
Figure 5 Functional Block Diagram
3.0 APPLICATION
Model DM-534C MicroSafe™ sensors are designed to detect and monitor oxygen deficiency in ambient air in
the range of 0-25%. Minimum sensitivity and scale resolution is 0.1%. Operating temperature range is -4° F. to
+122° F. While the sensor is capable of operating outside these temperatures, performance specifications are
verified within the limit.
3.1 Sensor Placement/Mounting
Sensor location should be reviewed by facility engineering and safety personnel. Area leak sources and
perimeter mounting are typically used to determine number and location of sensors. The sensors are generally
located 2-4 feet above grade.