Detcon DM-434B Manual de usuario descargar pdf (Pagina 5)

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 generat-

ed between the cathode and anode electrodes. This current output rises with increases in oxygen concen-

ration and reverses with lower concentrations. The quick response of the cell results in continuous moni-

toring of ambient air conditions.

3.0 APPLICATION

Model DM-434B sensors are designed to detect and monitor oxygen deficiency in ambient air in the range of

0-25%. 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 gen-

erally located 2 - 4 feet above grade.

3.2 Interference Data

Methane 100% = 0

Hydrocarbons 100% = 0

Hydrogen 100% = < -2%

Carbon Monoxide 20% = < -0.5%

4.0 SPECIFICATIONS

Method of Detection

Air battery diffusion/adsorption

Measurement Range

0-25% O2

Accuracy/Repeatability

± 2% FS

Response /Clearing Time

T90 < 20 seconds; T90 < 20 seconds

Zero Drift

< 2% per month

Operating Temperature Range

-4° to +122° F; -20°C to +50°C

Operating Humidity Range

0-99% RH (non-condensing)

Detcon Model DM-434B Oxygen Sensor PG.5

FUNCTIONAL BLOCK DIAGRAM

PRE-AMP

SIGNAL

CONDITIONING

(ZERO/SPAN)

XMTR

OWER

SUPPLY

I/O CIRCUIT

PROTECTION

SIGNAL OUT

POWER IN

SENSOR

1 2 3 4 5 6 7 8 9 10 11

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Detcon DM-434B Manual de usuario Pagina 5

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