Why Choose Comet for ozone toc?
FEATURE  COMPETITOR CLAIM  CRITICAL REVIEW  COMET ANALYTICS  THE COMET ADVANTAGE
Sampling  Continuous  Competitor's is really a Batch TOC -
It samples from a pumped internal circulating sample stream as follows:

A. The sample is continuously pumped past the Reactor input

then…..

B. A valve port opens, allowing an aliquot of sample into the reactor, then closes.  

then…..

C. Another valve port opens, and an aliquot of acid to lower the sample pH is pumped into the reactor, then the valve port closes. 

then…..

D. Another valve port opens, directing O2  to the reactor for sparging out the TIC, purgable and
volatile organics, and directs the sparged gas to the single, time-shared NDIR which detects the resultant CO2 related to TIC only. 

then…..

E. The ozone generator is switched on and sodium hydroxide is added to raise the pH of the sample to increase  hydroxyl radicals. Oxygen is required
 for ozone generation.

then…..

F, The remaining non-purgeable organic carbon (NPOC) in the sample is oxidized to CO2.  

then…..

G. Acid is added to lower the pH of the sample in the reactor, in order to release CO2 related to NPOC.
TC is not fully measured, therefore volatile organics not included in their "TOC" reporting.

then…..

H. Oxygen is used to sparge the resultant NPOC CO2 from solution, which is measured by the single, time-shared NDIR. 

then…..

I. The microprocessor calculates TOC (actually, only the NPOC) of the original aliquot of sample.

Data output is available on 4-20 mA or other industrial interfaces 

then…..

J. Because it is a "Batch" analyzer, the old sample must be removed and the Reactor thoroughly cleaned before the next cycle of analysis is initiated.  		 Truly Continuous



Pumps continuously flow Sample and Reagent to Reactor.

and

Pumps continuously flow sample and acid to sparger, lowering sample pH to 2.0



Sparge Gas (oxygen) continuously flows, stripping out TIC which is eliminated rather than competitive  measurement for less accurate mathematical subtraction to infer TOC after NPOC measurement





             




Use of reagent and continuous operation of ozone generator creates increased hydroxyl radicals for best oxidation




The Total Organic Carbon (TOC), is continuosly  oxidized in the reactor and the  resultant CO2 is measured by NDIR.
















A complete, Industrial Computer is standard for maximum utility Data Output by 4-20mA, 485 Modbus, SNAP Data control by local or remote wireless

  Real time with no loss of data because of Comet's patents
TIC Detection Measures TIC by a time-shared single NDIR.
No TIC carry-over to TOC measurements.		      
 
Purgeable and Volatile Organics 
vented in the 
sparging 		  Claims a VOC analysis but addition of sparged sample for TIC analysis and remaining NPOC in reactor does not include VOC.      
Oxidation   2 stage, single method, Ozone/Hydroxical Radical  Acid addition is used to force-release CO2, rather than relying on  the acid by-products of fully oxidized carbon.   Comet's patents provide for the most efficient oxidation available in the industry  Accurate TOC reporting directly relates to oxidation efficiency. 
Questionable oxidation is avoided thru Comet method of completion of the chemical oxidation process
Automatic Cleaning
  yes  yes, between each batch measurement  yes, automatically or on-demand  
TOC Calculation After TIC removal, sample is acidified and sparged.
CO2 related to "TOC" is measured by a time-shared single NDIR detector. "TOC" is calculated by microprocessor based electronics		 Actually only the NPOC component is measured. Purgeable and Volatile organics are lost and not included in their "TOC" calculation.  A complete, Industrial Computer is standard  
TC Calculation  "TOC" (actually, NPOC) measurement is added to "TIC" measurement for "TC"  TC cannot be calculated by adding NPOC to TIC, because POC/VOC components are not included in their method.    
Maintenance  Every 6 months    Generally every 6 months  On failure of automatic "Benchmark"/Auto-Validation Test.
Calibration  Reliance on 6 months maintenance program  Serious analyzer Users will not trust any analyzer manufacturer that its analyzer needs no calibration or verification of proper operating status. Basic approved analytical practices demand on-site verification of calibration and operational status.  Auto-Validation and Auto-Cal (std.)  Comet Auto-Validation feature may be "on demand" or programmed by day/time to automatically  feed a standard to the analyzer and compare its response  to the original calibrated response and indicate a "pass" or "failed" condition.
Filtration Requirements  None    None  
Particle Size  Up to 2 mm, soft particulates    3 mm, soft particulates (std.). Larger particle handling available.  Allowance for particle size relates directly to pump tube diameters and response time. Larger tubing results in longer response times.
Chloride Interference
  None    None  
Response Time  A minimum of under 6 minutes for each sample batch. Max. time not specified  Much longer response times for the total "TOC" analysis is often experienced in the field.  Reactor 
cleaning and sampling stages should also be included in total response time.		  6 minutes T90 depending on application and particulate sizes.  Simultaneously, the best response time is provided, rather than the alternate serial batch method. 
Electronics  Microprocessor based    Full industrialized computer   
Carrier  Oxygen Required    Oxygen Required  
Warranty  Up to 1 year
 NDIR-Sample cell- 5 years.
NDIR Electronics-2 years. 
Inhouse manufactured parts-18 months (includes inhouse labor).
(See parts Exchange Service Program)		  The NDIR is a most critical component in any TOC analyzer.
The Comet NDIR is the most rugged NDIR for difficult TOC analysis, as proven by many years 
of reliable field experience.
Competitor is a Republic of Ireland Company