The SITRANS SL gas analyzer consists of a pair of cross-duct sensors, a transmitter unit and a detector unit, both with the same dimensions. The complete analyzer is integrated in these two enclosures. The transmitter unit contains the laser source whose light is transmitted to the receiver through the measurement path. The detector unit contains a photodetector including electronics as well as a reference cell. The detector unit is connected to the transmitter unit by means of a sensor cable. A further cable on the receiver is used to connect the power supply and the communication interfaces. The receiver enclosure contains a local user interface (LUI) with an LC display which can be read through a window in the cover. The LUI is operated by remote-control.

Transmitter and detector units

Special features of the transmitter and detector units:

• In-situ cross-duct sensors, designed as transmitter and detector units, connected via sensor cable
• Powder-coated aluminium; stainless steel
• Degree of protection IP65
• Adjustable process connection plates
• Flange sizes (provided by customer): DN50/PN25, ANSI 4''/150 lbs
• Purging gas connections (see "Purging")
• Optional: Explosion-protected version in accordance with
  
  • Ex II 2G Ex de op is IIC T6
    Ex II 2D Ex tD A21 IP65 T85°C

SITRANS SL, detector unit

Parts in contact with the process gas

Only the stainless steel and borosilicate window flange of the sensor is wetted by the process gas. This has optional connections for purging the process gas side with an appropriate gaseous medium.

Display and control panel

Special features of the detector unit:

• Display for simultaneous output of result and device status
• LED backlighting of display
• Remote operation using membrane keypad and softkeys which are easy to clean
• Menu-driven operation for parameterization and diagnostics
• Remote operation via infrared interface for safe use in hazardous zones

Local user interface (LUI) of SITRANS SL in the detector unit (display of measured value)

Remote control keypad for SITRANS SL

Connection cables

SITRANS SL is supplied as standard without connecting cables. These must be provided by the customer or are available as accessories. Exception: the ATEX version is supplied as standard with cabling.

The sensor cable connects together the transmitter and detector units of the analyzer.

The sensor connecting cable available as a cable set for the ATEX version as standard, and for non-Ex applications optionally, is offered in lengths of 5, 10 or 25 m. This (optional) cable set also enables permanent installation of an Ethernet cable used for service and maintenance purposes.

A rugged cable sleeve should be used as UV protection for installations in open cable ducts or channel systems.

The statutory directives must be observed in the event of installation in hazardous areas.

For the ATEX version of SITRANS SL, the sensor connecting cable must be connected between the two Ex-e terminal boxes secured on the transmitter and receiver units.

Inputs/outputs

• 2 analog inputs (4 to 20 mA) for process gas temperature and pressure
• 2 analog outputs (4 to 20 mA) for gas concentration or for concentration and transmission
• 1 configurable binary input
• 2 configurable binary outputs (display of faults, maintenance requirement, function monitoring, alarms for limit violations of measured value or transmission)
• Optional: 1 PROFIBUS DP interface with:
  
  • Output of concentration as cyclic data
  • Alarm output, alarm classification
  • Input for temperature and/or pressure data for compensation

The PROFIBUS DP protocol provides DPV0, cyclic data. Measured values are provided with additional quality data.

Optional

• 1 Modbus interface with
  
  • Output of concentration as cyclic data
  • Alarm output, alarm classification
  • Input for temperature and/or pressure data for compensation
• 1 Ethernet 10Base-TX port, only for servicing and maintenance

Note:

In contrast to the other interfaces, the Ethernet plug-in connector on standard non-Ex devices is only accessible following removal of the detector unit cover. With the help of the sensor connection cable set (optional with non-Ex devices), an Ethernet cable can be permanently installed via the terminal box of the sensor connecting cable. The Ethernet connection via the sensor connecting cable can also only be used for temporary service and maintenance purposes.

NOTICE:

In an Ex environment, Ethernet connections may only be made or removed with the permission of the plant operator!