TOCII CA72TOC

Summary

Product identification

Product: TOCII CA72TOC Type: Analyzer for online measurement of TOC in aqueous media using thermic catalytic combustion Document: TI00448C/07/EN/14.21, 71530030 Revision Date: 2021-06-30

Application

The TOCII CA72TOC is designed for:

• Monitoring of industrial wastewater (inlet and outlet)
• Control of process wastewater
• Monitoring of surface run-off in industrial systems and airports
• Municipal wastewater monitoring
• Measurement of carbon load for nutrient dosing

Benefits

• Optimized for industrial applications with fluctuating pH and high salt loads.
• Facilitates fast and easy maintenance with accessible components.
• Offers selectable measuring ranges from 0.25 mg/l to 12,000 mg/l TOC, expandable by predilution.
• Features pH-controlled acid dosing for TIC stripping, minimizing acid consumption.
• Employs a "double-batch" method for measurement.
• Available with one- and two-channel measurement options.
• Includes a heated salt trap to significantly increase operating time.
• Supports externally controlled self-monitoring with a TOC standard for limit violation.

Function and system design

Measuring principle

The analyzer determines Total Organic Carbon (TOC) by thermic catalytic combustion followed by NDIR detection of the resulting CO₂. The process involves an optional sample dilution for high salt loads or TOC values, acidification to eliminate inorganic carbon (TIC) via stripping, particulate solid removal, and subsequent incineration at 850 °C. The CO₂ content is then measured. The "double-batch" method ensures the reactor and gas circuit are flushed with CO₂-free carrier gas before the next measurement, establishing a baseline.

Measurement, calibration, and adjustment

• Single-point calibration can be triggered externally or by timer.
• Two-point adjustment is available to adapt the analyzer to system changes.

Two-channel measuring principle

Allows measurement of two different sample streams within a single device, suitable for sample streams with similar measuring ranges.

Heated salt trap

Increases operating time by efficiently removing salts from the furnace, reducing buildup. Allows easy removal and cleaning of the trap without shutting down the furnace.

pH-controlled acid dosing

Adds only the necessary amount of acid to reach a pH of 2.5, reducing acid consumption and salt release into the furnace. Prevents humic acid precipitation in municipal wastewater.

Double-batch method

Links water and gas circuits, preparing the aqueous sample continuously and feeding it to the furnace in batches. Circulates and accumulates CO₂-containing gas for measurement, enabling the recording of large sample volumes (1200 µl) for high sensitivity.

Input

Measured variable

• Total organic carbon (TOC)

Measuring range

• CA72TOC-A: 0.25 to 600 mg/l TOC
• CA72TOC-B: 1 to 2400 mg/l TOC
• CA72TOC-C: 2.5 to 6000 mg/l TOC
• CA72TOC-D: 5 to 12,000 mg/l TOC

With optional predilution, the measuring range can be expanded by a factor of 20.

Input signal

• 8 signal inputs: 24 V DC, active, load max. 500 Ω
  • Input #1: Service, trigger calibration
  • Input #2: Service, trigger adjustment
  • Input #3: Service, trigger screen flush
  • Input #4: Service, trigger power flush
  • Input #5: Not assigned
  • Input #6: Not assigned
  • Input #7: Trigger standby
  • Input #8: Trigger channel switchover (optional)

Output

Output signal

• Measuring channel 1: 0/4 to 20 mA, galvanically isolated
• Measuring channel 2 (optional): 0/4 to 20 mA, galvanically isolated
• Signal on alarm: 4 outputs (Limit value alarm, Fault message, Standby message, Operational control) - Floating, normally closed (max. 0.25 A / 50 V)

Load

• Max. 500 Ω

Data interface

• RS 232 C, proprietary, for data output and remote operation (optional)
• USB

Electrical

Power supply

• Supply voltage: 115/230 V AC, 50/60 Hz
• Power consumption: 800 VA
• Fuses:
  • Power distribution: 2.5 A, slow-blow, fine-wire fuse 6.3 x 32
  • Relays: 4 A per relay, slow-blow, TR5
  • Power unit: 2 A, slow-blow, fine-wire fuse 5 x 20

Performance characteristics

Performance characteristics determined in accordance with ISO 15839, Annex B. Data refers to a CA72TOC-B1A0B1 with 300 µl sample metering.

• Measured value resolution: 1.1 % (at 20 % of range), 4.6 % (at 80 % of range)
• Maximum measured error: 0.4 % (at 20 % of range), 2.4 % (at 80 % of range)
• Repeatability: 0.4 % (at 20 % of range), 1.6 % (at 80 % of range)
• Short-term drift: 0.5 %/day
• Limit of detection (LOD): 0.75 % of end of measuring range
• Limit of quantification (LOQ): 2.5 % of end of measuring range

Mechanical / hydraulic

Installation

• Mounting location: Bench mounting, Wall mounting, or On a base frame. Ensure rear accessibility for maintenance.
• Drain: Requires a drain beneath the device using a 6/8 mm PTFE pipe. No backpressure.
• Exhaust gas connection: Required. No backpressure in the 4/6 mm hose.
• Environment: Avoid direct sunlight. Observe ambient conditions.

Compressed air supply

• Use CO₂-free, dry, and oil-free air.
• Requirements: < 3 ppm CO₂, < 3 ppm hydrocarbons.
• Pressure: 2 bar (29 psi) ± 5 %.
• Requires a CO₂ scrubber and pressure regulator.
• Connection: 4/6 mm DN.
• Required quantity:
  • 600 l/h for CO₂ adsorber (inlet 5 to 16 bar)
  • 60 l/h for soda-lime CO₂ scrubber (inlet 4 to 10 bar)

Water supply

• Connection: 6/8 mm DN or G3/8 coupling.
• Pressure: 2 to 4 bar (29 to 58 psi) (except for sample dilution version).
• Version with sample predilution:
  • Use deionized (DI) water or drinking water < 10 °dH (< 179 ppm CaCO₃).
  • Pressure: 3 ± 0.2 bar (43.5 ± 3 psi).

Gas flow

• Circuit gas: 0.7 to 1.2 l/min (1.5 to 2.5 ft³/h).
• Carrier gas: Approx. 0.8 l/min (1.7 ft³/h) at 2 bar (29 psi).
• Stripping gas: Approx. 0.15 l/min (0.3 ft³/h) at 2 bar (29 psi).

Dimensions

• See Figures 3 and 4 in the document for detailed dimensions in mm (in).

Weight

• Approx. 75 kg (165 lbs).

Materials

• Housing: Aluminum, powder-coated.
• Front window: Glass, conductive coating.
• Valve seals: EPDM, FPM, FFKM.
• Pump hoses: Ismaprene.
• Pump and pump seals: PTFE, FFKM.
• Reagent and sample hoses: PTFE, PE.
• Exhaust gas and ventilation hoses: PTFE, PE.
• Outflow hoses: PTFE.

Environment

• Ambient temperature range: +5 to 35 °C (41 to 95 °F).
• Humidity: 20 to 80 %, non-condensing.
• Degree of protection: IP54.
• Electromagnetic compatibility: EN 61326-1:2013, Class A for Industry Process.
• Medium temperature range: 4 to 40 °C (39 to 104 °F).
• Medium pressure range: Non-pressurized infeed to the analyzer from sample preparation.
• Sample flow rate: 20 ml/min (0.32 US gal/h).
• Sample consistency: Water-based. Flammable substances must not occur in combustible concentrations; sample dilution may be necessary.
• Sample feeder volume: 90 ml (3 fl.oz).

Operability

• Local operation: Features a main switch, numerical keypad, USB port, and a 16-line x 40-character screen.

Accessories

Available accessories include retrofitting kits for dilution units and heated salt traps, sample conditioning systems, CO₂ scrubbers, and reagent/parent solutions for calibration.

Disclaimer

This extraction may miss figures, footnotes, or revisions. Contractual data must match the OEM PDF revision used on the project.

Official datasheet (PDF)

Lenntech datasheet mirror