Spectrex Quasar 900 Open-Path Gas Detection System Manual de usuario descargar pdf (Pagina 32)

SafEye

Quasar 900 Gas Detector

20 Electrical Specifications

Immunity to false

alarm:

Does not produce false alarm and is not

influenced by Solar Radiation, Hydrocarbon

Flames and other external IR Radiation Sources.

4.2 Electrical Specifications

Operating Voltage:

18-32 VDC

4.2.1 Power Consumption

Table 9: Detector and Source Maximum Power Consumption

Without Heated

Optic (Max.)

With Heated

Optic (Max.)

Detector

200mA

250mA

Source

200mA

250mA

4.2.2 Electrical input protection

The input circuit is protected against voltage-reversed polarity, voltage

transients, surges and spikes according to EN50270.

4.2.3 Electrical outputs

4.2.3.1 0-20mA Current Output

The 0-20mA is isolated sink option. This output can be configured as Source

(see Appendix A).

The maximum permitted load resistance is 600 ohm.

4.2.3.2 Communication Network

The Detector is equipped with an RS 485-communication link that can be

used in installations with computerized controllers.

Communication is compatible with the Modbus protocol:

 This protocol is a standard and is widely used.

 It enables continuous communication between a single standard Modbus

controller (Master device) and a serial Network of up to 247 Detectors.

 It enables connection between different types of Spectrex Detectors or

other Modbus devices to the same Network.

4.2.3.3 HART Protocol

The HART Protocol is a digital communication signal at low level on top of

the 0-20mA.

This is a bi-directional field communications protocol used to communicate

between intelligent field instruments and the Host System.

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