Clora® Online Analyzer

Online Chlorine Analysis in Liquid Hydrocarbon Process Streams

Chlorine is often present in crude oils and the concentration can vary greatly depending on the origin. If not removed, Chlorine can react to form highly corrosive hydrochloric acid in areas such as crude tower overheads, leading to serious operational issues, economic loss and safety concerns. The need for a reliable online chlorine analyzer for refining process control is more important than ever. Clora Online complies with ASTM D7536 method and delivers continuous chlorine analysis to monitor plant equipment corrosion. By monitoring desalted crude, a plant can optimize performance and immediately see impacts of crude changes (including organic chloride). Additionally, monitoring overhead water can provide the necessary feedback for chemical feed.


  • Multi-stream analysis capability
  • Auto-validation capability

Methods: ASTM D7536

Chlorine contributes significantly to the corrosion of plant equipment and must be treated accordingly. With ever-changing crude quality and potential for process upsets, chlorine levels can shift quickly, making real-time analytical results invaluable. Powered by MWDXRF ®, Clora® Online uses ASTM D7536 technology and delivers real-time, continuous analysis of total chlorine from 0.2 ppmw up to 3000 ppmw. By monitoring desalted crude, a plant can optimize performance and immediately see impacts of crude changes (including organic chloride). This process analyzer is ATEX and NEC certified for hazardous area locations.


  • Upstream desalting, refining, power generation, and effluent management
  • Total chlorine analysis in:
    • raw and desalted crudes
    • water and effluent streams
    • refinery process streams
    • finished product


  • Uses ASTM D7536 technology
  • ATEX Zone 1 and NEC Cl | Div 2 Certified
  • LOD: 0.2 ppmw in hydrocarbon matrices @ 300 s
  • LOD: 0.6 ppmw in aqueous streams @ 300 s
  • Dynamic range: 0.2 ppmw – 3000 ppmw
  • Calibration is linear up to 3000 ppmw and one calibration curve runs all hydrocarbon matrices
  • Robust industrial design: wall mounted or stand-alone


  • Continuous, real-time analysis
  • Rapid response to upsets
  • Easy to use with an intuitive touch screen interface
  • Direct measurement in ppm wt
  • Low Maintenance: no consumable liquids, gasses, combustion, or sample conversion
  • Not sensitive to sample temperature changes

Analytical Platform: MWDXRF

Dynamic Range: Hydrocarbon: 0.2 ppmw – 3000 ppmw / Aqueous: 0.6 ppmw – 3000 ppmw

Response Time: 300 s for precise measurement, 15 s for rapid update

Calibration: 3-5 point linear calibration curve

Data Communication: 2x 4-20 mA analog outputs, multiple discrete alarm outputs

Digital Communication: Modbus TCP, Modbus RS-232, Modbus RS-485 (half or full duplex)

Local HMI: Touchscreen display

Remote Diagnostics: Optional via TCP/IP or UDP

Power: 110-240 VAC, 50-60 Hz, 750 W max.

Instrument Air – Purge and Valve: 60-115 psig, (414-793 kPa) 4 scfm max; -40 F (-40 C) dewppoint, oil free, N2 optional

Ambient Temperature: 32-95 F (0-35 C) Standard; -4 to 113 F (-20 to 45 C) Optional – Consult Factory

Dimensions: 60 in (h) x 38 in (w) x 18 in (d) / 152 cm (h) x 97 cm (w) x 46 cm (d)

Weight: 300 lbs (136 kg)

Certifications: ATEX Zone 1 Ex db ia [ia Ga] pxb IIC T4 Gb; CE, NEC Class I Div 2 Groups B,C,D T4A

Lazar Scientific is your reliable source for Elemental Analysis.