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Protoc 300

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TOC Analyser

An automated microprocessor controlled instrument for the on-line measurement of either Total Organic Carbon (TOC) or Total Carbon (TC).

  • Measured range chosen from 0-10ppm to 50,000ppm (user specified), for ranges of 10,000ppm and above an automatic dilution is required
  • Automatic Zero and Calibration
  • Response time from 2 to 6 minutes T90 depending on application
  • Accuracy, better than +/- 2% of the instrument range relative to the calibration solution
  • Detection limit better than 1% of the calibrated range
  • Reagent, acidified Sodium Persulfate typically 5% strength at 1 mil/min consumption
  • Carrier gas typically compressed air at 2.2bar 800mil/min
  • Power requirements from 100 volts to 240 volts 50/60 Hz <150 watts
  • Analyser Height 62cm Width 50cm Depth 28cm Weight 35Kg
  • GRP case protected to IP55


  • On-line continuous measurement of sample
  • Auto zero and auto calibration
  • Variable sequence timings to suit application
  • Automatic wash system for periodic cleaning with variable timing to suit application
  • Large 16×2 dot matrix Liquid Crystal Display
  • Integrated key pad and easy menu navigation
  • User friendly layout for ease of maintenance
  • Long life components reducing cost of ownership


  • Isolated 4-20 mA (max 500 ohms load).
  • 2 alarm relay set points, non latching for level alarm.
  • Utility alarm relay for loss of carrier gas pressure, reagent, or power.
  • No sample (or off-line) alarm relay.
  • All relay contacts rated at 0.5 Amp 125 volts AC.
  • RS232 / RS485 digital (option)

Measuring Principle

PROTOCĀ® instruments use an Ultra-Violet promoted persulphate oxidation to continuously determine the contamination of organic chemicals present in the sample. A carrier gas continuously sparges the reaction vessel liberating the resultant CO2 gas which is delivered to an Infra-Red detection system. Inorganic carbonates can be automatically removed by sample pre-treatment using an acid sparge. The total organic carbon concentration is continuously reported with a fast speed of response.