Enmet PGD2Manual.pdf Bedienungsanleitung PDF herunterladen (Seite 21)

ENMET Corporation PGD3-IR

10 S

ENSORS

10.1 Infrared Sensors

The PGD3-IR instrument is fitted with miniature infrared sensors for the detection of flammable gases (except hydrogen) and carbon

dioxide. The instrument can house up to 2 infrared sensors. They are ‘EEx d’ certified types and must only be replaced with sensors

labelled with the certification details stated in section 2 of this manual.

The flammable sensors are non-selective that is, they will detect a range of hydrocarbon gases. However, during manufacture of the

PGD3-IR instrument the sensors are calibrated to methane. See Section 6.11 for relative responses for other hydrocarbon gases.

10.1.1 LEL Flammable Sensor Specification

Gases detected Various combustible gases and vapors

Range 0 100% LEL

Resolution 1% LEL

Operating Voltage 3 to 5 Volts dc

Operating Current 80 mA

Response Time < 30 Seconds

Linearity Linear 0-100% LEL Methane

Long Term Sensitivity 1% LEL / month

Long Term Zero Drift < 3% LEL / year

10.1.2 0-100% Volume Flammable Sensor Specification

Gases detected Methane

Range 0 100% Volume

Resolution 0.05% Volume

Operating Voltage 3 to 5 Volts dc

Operating Current 80 mA

Response Time < 30 Seconds

Linearity Linear 0 - 100% Volume Methane

Sensitivity Drift < 5% volume methane / month

Range Changing Automatically carried out by the instrument

10.1.3 Carbon Dioxide Sensors

Range 0 5% Volume CO

Resolution 1% LEL

Operating Voltage 3 to 5 Volts dc

Operating Current 80 mA

Response Time < 30 Seconds

Linearity Linear 0 - 5% CO

Zero Drift +/ 500ppm / month

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Enmet PGD2Manual.pdf Bedienungsanleitung Seite 21