1. The BioTector B7000i TOC analyzer with integrated oxygen concentrator
Commissioning and Start up Procedures

2. BioTector Documents
This presentation should be viewed with the following document available:
Manual appropriate to the BioTector
Commissioning check sheet appropriate to the system being commissioned.
Process test presentation.
Note that this presentation covers a typical system, your system may incorporate slight changes not shown in this presentation.

3. Safety Wear appropriate PPE!
The BioTector runs on mains electricity, 115V or 230V
Some components may be hot
The BioTector uses acidic and basic reagents
Electrostatic devices may be present on some PCB’s, always wear a grounding strap

4. Use of Thread Tape on Fittings

5. Orientation of Ferrule Fittings

6. System Inspection & Connections
Section 1:
System Inspection & Connections

7. Reconnect tubing disconnected for shipping
Reconnect the tube linking the Ozone Generator to the acid TEE, at the TEE.
Reconnect the tube linking the Cooler and CO2 analyzer, at the top of the Cooler.
Reconnect the tube linking the Ozone Destructor to the Exhaust Valve (MV1), at the top of the Ozone Destructor.
Cooler connection
Ozone destructor connection
Connection from ozone generator.

8. Reconnect the tubes in the peristaltic pumps
Replace the tube in the acid and base pumps, confirm the dove-tail is securely tightened.
Replace the tube in the Sample pump, lock the lever in place.

9. Confirm connections and fittings are tight
Confirm electrical connections are tight.
Confirm fittings are tight.

10. Confirm mains voltage and frequency is correct
Confirm the mains supply voltage and the frequency on site match the analyzer requirements. Connect the power cable.
Connect low voltage wiring (e.g. Fault Relay).
Connect the 4-20mA cables.

11. Air supply connection

12. Exhaust port
Connect the EXHAUST port with ¼” PFA tube to a safe and well ventilated area or to open atmosphere. The tube must have no restrictions and it must be placed so that any condensation and liquid build-up in the tubing is prevented. The maximum length of ¼” PFA tubing installed in Exhaust line is 10 meters. If tubing longer than 10 meters is required, the use of a larger ID tubing or pipe is recommended.
The end of the exhaust tubing should have a slight downward slope so that any condensation or liquid at the outlet of the tubing cannot freeze at night or during cold weather.

13. Note, no vent hole for base.
Reagent connections
Note, no vent hole for base.
Only CO2 Filter.
Note, vent hole for acid.
Remove sealing tapes on CO2 filter before fitting!
BASE, 1.2N Sodium Hydroxide solution, low in carbonate. Used as a BioTector base reagent.
ACID, 1.8N Sulphuric Acid solution, with typically 80mg MnSO4.H2O catalyst per litre.

14. Typical Commissioning Check Sheet extract
Sample connections
Confirm the sample or samples are at ambient pressure. Examples of sample connections are on the next slides.
If the sample is under pressure, then the system must be designed to isolate the sample in the event of a tube leak within the BioTector, for example a system consisting of a leak detector and automatic isolation valve (this valve must be located outside the BioTector) must be installed. Note that the maximum allowed sample pressure is 500mbar.
_____
Connect the sample or samples to the BioTector with ¼” PFA tube. These ports are marked SAMPLE 1…6. Ideally, all these tubes should have the same length.
If a SAMPLER has been supplied with the system, connect the sampler in accordance with the drawings and instructions in the sampler manual.
Connect the PVC-U Drain Pipe (installed outside the BioTector) to a well ventilated pressure free drain using the supplied 1 inch braided hose.
Confirm the SAMPLE OUT port is connected to the PVC-U Drain Pipe. If the PVC-U Drain Pipe is not used, connect the SAMPLE OUT with ¼” PFA tube to well ventilated pressure free drain. The tube should be fitted so that it cannot freeze in cold weather.
Confirm the sample BYPASS port is connected to the PVC-U Drain Pipe. If the PVC-U Drain Pipe is not used, connect the sample BYPASS port with ¼” PFA tube to a large diameter tube, as shown in drawing
The end of the sample bypass tube should be level with the centre of the Sample (ARS) Valve. The large diameter tube should be connected to a pressure free drain. The end of the sample bypass line should not be under the surface of the water in the drain at any time. The tube should be fitted so that it cannot freeze in cold weather.

15. Example of overflow catch-pot with optional feed and drain valves
Sample connections:
Example of overflow catch-pot with optional feed and drain valves
The ideal sample is close to the BioTector, has no pressure and is located slightly below the BioTector.

16. Example of Tube Positioning in Sample Stream
Sample connections:
Example of Tube Positioning in Sample Stream

17. Sample out and Bypass connections
BioTectors are fitted with an integral 25mm drain.
Notes:
Level of Sample Bypass Fitting.
Drain should rest on clip as shown.

18. Section 2:
Power Up

19. Confirm Time, Date, Valves and MFC
Power up the analyzer. Go to Operation, Time & Date menu and adjust the time and the date.
_____
Using the Simulate menu:
Confirm that the Exhaust, Sample Out and TOC Acid Valves are working.
Confirm that the Sample (ARS) Valve is working.
If installed, confirm that all other valves (e.g. multi-stream valve) are working.

20. Typical Simulate Menu This is the Simulate menu.
Individual items can be checked when the BioTector is stopped.

21. Valves, MFC test
Solenoid valves: look for LED, and listen for ‘click’ to confirm their basic operation.
Confirm ARS Sample in valve rotates, LED’s 12,13,14 light on the signal PCB.
Pinch valves: check for physical movement in plunger.
Test MFC by confirming flow matches set-point

22. Valves, MFC test Relay PCB, used to drive valves and pumps.
Signal PCB.
With LED’s for Pump and ARS Sample in valve sensors.
Ozone PCB.
Stream Expansion PCB.
Typically used for Stream valves.

23. Oxygen Purity Test ____
Power up the system for at least 10 minutes before the oxygen purity test is carried out. Using the Simulate menu set the flow to 10 l/h and flow oxygen gas through the CO2 analyzer for 5 minutes. At the end of this period, the CO2 analyzer zero reading (ppm CO2) should be typically within ±0.5% of full scale of the CO2 analyzer range. For instance, if the CO2 analyzer range is 10000ppm, then the CO2 analyzer zero reading should be typically within ±50ppm.
(If the CO2 analyzer zero reading is outside the specifications, confirm that there is no CO2 in the oxygen gas by connecting the CO2 filter “used with the sodium hydroxide reagent container” between the Cooler and CO2 analyzer inlet port . The Spigot on the CO2 filter can be used to connect the tube from the top of the cooler to the CO2 filter. Set the MFC to 10 l/h. As the size of the CO2 filter is small, keep the 10 l/h gas flow running for at least for 5 minutes and record the CO2 zero readings at the end of the 5 minute period. If the CO2 zero readings do not drop significantly with the CO2 filter in place, this will indicate that there is no CO2 contamination in the oxygen supply.)
____

24. Oxygen Purity Test
Ozone Generator
MV1 Exhaust
Cooler
CO2 Analyser
Oз Destructor
AIR
Catch-pot
Connect the CO2 filter “used with the sodium hydroxide reagent container” between the Cooler and CO2 analyzer inlet port and set the MFC to 10 l/h.
MV3 Cleaning
MV7 Injection
MV9 Manual
MV11 Stream 2
MFC
MV4 Sample In
P1 Sample Pump
OXYGEN
MV6 Acid
Oxygen
module
ACID
Mixer P2
P3 Acid Pump
BASE
P4 Base Pump
Reactor
MV5 Sample Out

25. Section 3:
Pump Tests

26. The Reagents Purge Procedure.
The Reagents Purge Procedure is used to:
Purge the reagent lines and pumps of old reagents, and fill them with new reagents.
Wash and pH neutralize the reactor.
Phase 1: Purge the reagent lines and pumps of old reagents, and fill them with new reagents.
The acid and base pulse pumps run at the same time for a period of 18 seconds. During this period, acid and base from the reagent containers fill the reagent lines, pumps and reactor. As the acid reagent is 1.5 times as strong as the base reagent, the pH of the reagent mix in the reactor is acidic, with a pH<1.
The reagents are then purged from the reactor.
This is repeated 5 times to ensure that all the old reagents are purged from the system.
The reactor mixer does not run during this phase.
Phase 2: Wash and pH neutralize the reactor.
The acid pump runs for 12 pulses, and the base pump for 18 pulses. As the acid reagent is 1.5 times as strong as the base reagent, the pH of the reagent mix in the reactor is neutral ~ pH7.
The Reactor Mixer runs for a period of 100 seconds, washing the reactor.

27. Check all Peristaltic Pumps
Follow the procedure in the commissioning check sheet to test the peristaltic pumps.
The expected pump rate of the sample and reagent pumps are detailed in the sheet.
These can be checked using a 10ml graduated cylinder, and by running the pumps with appropriate valve, example acid valve from the appropriate simulate menu, and pumping water through them into the graduated cylinder. An example is shown opposite.
Note: For the correct operation of the system, the measured Acid and Base Pump rates must be identical or similar. The maximum allowable difference in the measured volumes for acid and base injections above should not be more than 0.2ml.

28. Base sensor, LED17 on signal PCB
Pump tests
Ozone Generator
MV1 Exhaust
EXHAUST
Air
Cooler
CO2 Analyser
Oз Destructor
AIR
Oxidized Fluid
Catch-pot
SAMPLE
OUT
MV3 Cleaning
MV7 Injection
Sample, LED15
BYPASS
P1 Sample Pump
MV9 Manual
MV11 Stream 2
MFC
MV4 Sample In
STREAM 1
STREAM 2
MANUAL
Acid, LED16
OXYGEN
Base sensor, LED17 on signal PCB
MV6 Acid
Oxygen
module
ACID
Mixer P2
P3 Acid Pump
BASE
P4 Base Pump
Reactor
MV5 Sample Out

29. Base sensor, LED17 on signal PCB
Pump tests
Ozone Generator
MV1 Exhaust
EXHAUST
Air
Cooler
CO2 Analyser
Oз Destructor
AIR
Oxidized Fluid
Catch-pot
SAMPLE
OUT
MV3 Cleaning
MV7 Injection
Sample, LED15
BYPASS
P1 Sample Pump
MV9 Manual
MV11 Stream 2
MFC
MV4 Sample In
STREAM 1
STREAM 2
MANUAL
Acid, LED16
OXYGEN
Base sensor, LED17 on signal PCB
MV6 Acid
Oxygen
module
ACID
Mixer P2
P3 Acid Pump
BASE
P4 Base Pump
Reactor
MV5 Sample Out

30. Commissioning Menu Settings
Section 4:
Commissioning Menu Settings

31. Reaction Time
In Reaction Time menu, program the INTERVAL time depending on the required sample analysis frequency.

32. Sample Pump Times
In Sample Pump menu, set the correct Sample Pump FORWARD and REVERSE times. These times are unique for each site depending on the distance between the sample and the BioTector. Sample Pump times can be set individually for each stream in the Sample Pump menu. Adjust the Sample Pump FORWARD times and confirm that sample liquid coming from each stream bypasses the system and drips into the drain.
Settings can be checked in the appropriate Simulation and Process Test menus.
If the BioTector SAMPLER is used, then the default sampler time is 100s. This default time must not be changed unless the time programmed in the PLC of the sampler is also changed. See BioTector Sampler User Manual for details.

33. The sample should be pumped out the drain and on for 1 meter.
Sample Pump Test: Forward
Ozone Generator
MV1 Exhaust
EXHAUST
Air
Cooler
CO2 Analyser
Oз Destructor
The sample should be pumped out the drain and on for 1 meter.
AIR
Oxidized Fluid
Catch-pot
SAMPLE
OUT
MV3 Cleaning
MV7 Injection
BYPASS
MV9 Manual
MV11 Stream 2
MFC
MV4 Sample In
STREAM 1
STREAM 2
P1 Sample Pump
MANUAL
OXYGEN
MV6 Acid
Oxygen
module
ACID
Mixer P2
P3 Acid Pump
BASE
P4 Base Pump
Reactor
MV5 Sample Out

34. Sample Pump Test: Reverse
Ozone Generator
MV1 Exhaust
EXHAUST
Air
Cooler
CO2 Analyser
Oз Destructor
AIR
Oxidized Fluid
Catch-pot
SAMPLE
OUT
MV3 Cleaning
MV7 Injection
BYPASS
MV9 Manual
MV11 Stream 2
MFC
MV4 Sample In
STREAM 1
STREAM 2
P1 Sample Pump
MANUAL
OXYGEN
Sample and oxidized fluid should be completely pumped back to sample point.
MV6 Acid
Oxygen
module
ACID
Mixer P2
P3 Acid Pump
BASE
P4 Base Pump
Reactor
MV5 Sample Out

35. Stream Program
In Stream Program menu, set the required multi-stream parameters (stream operation sequence, number of reactions to run at each stream and operation range for each stream). Automatic range change function should not be used in multi-stream systems.

36. COD/BOD Program
In COD/BOD program menu, if COD and/or BOD parameter is required, program DISPLAY with the required parameter. Install the necessary STREAM and TOC FACTORS for each stream. If required, the factors for each stream can be obtained following the procedures described in information sheet “I030. TOC to COD or BOD Correlation Method”, which is available in the MMC/SD card shipped with the BioTector.

37. New Reagents Program
In New Reagents Program menu, confirm the factory settings are suitable for site requirements.
For example, does the customer require an automatic span calibration each time the reagents are installed?

38. Reagents Monitor Program
In Reagents Monitor menu, if required, activate/deactivate the reagent monitoring function, program the reagent volumes.
and set the relevant reagent warnings.

39. Autocal Program
In Autocal Program menu, if required, program the automatic zero and span calibration cycles.

40. 4-20mA Program
In 4-20mA Program menu, set the required parameter for each stream. Set the full scale concentration level for each 4-20mA channel. Full scale should be compatible with the external process control device (e.g. DCS) and BioTector calibrated ranges. In order to see BioTector calibrated ranges, see System Range Data screen and Stream Program menu.

41. Alarm Program
In Alarm Program menu, set the available relays to the required ALARM levels for each stream. If necessary, to modify the relay parameters and conditions, go to Output Devices menu.

42. Data Program
In Data Program menu, if required, program the relevant configuration parameters for the specific output device communication port.

43. Signal Simulate
Go to Signal Simulate menu and test 4-20mA signals. Simulate 1mA, 4mA, 12mA and 20mA signals and confirm that the signals are received by the external process control device (e.g. DCS). Simulate all digital input and output signals and confirm correct operation.

44. Zero and Span Calibration
Section 5:
Zero and Span Calibration

45. The Install New Reagents Procedure.
The Install New Reagents procedure is used to:
Purge the reagent lines and pumps of old reagents, and fill them with new reagents.
Wash and pH neutralize the reactor.
Perform a Zero Calibration on the BioTector.
Phase 1: Purge the reagent lines and pumps of old reagents, and fill them with new reagents.
The acid and base pulse pumps run at the same time for a period of 18 seconds. During this period, acid and base from the reagent containers fill the reagent lines, pumps and reactor. As the acid reagent is 1.5 times as strong as the base reagent, the pH of the reagent mix in the reactor is acidic, with a pH<1.
The reagents are then purged from the reactor.
This is repeated 5 times to ensure that all the old reagents are purged from the system.
The reactor mixer does not run during this phase.
Phase 2: Wash and pH neutralize the reactor.
The acid pump runs for 12 pulses, and the base pump for 18 pulses. As the acid reagent is 1.5 times as strong as the base reagent, the pH of the reagent mix in the reactor is neutral ~ pH7.
The Reactor Mixer runs for a period of 100 seconds, washing the reactor.
Phase 3: Perform a Zero Calibration on the BioTector.
Using the reagent configurations from the selected range or ranges, a zero calibration is carried out by injecting the TIC acid into the reactor, followed by the base which is then oxidized, followed by the TOC acid.
The zero offset is calculated from the result.
The above procedure is repeated for the programmed number of zero reactions, and the zero offset calculated from the results.
When this is complete, confirm that the zero readings are stable.

46. Install New Reagents: Purge of Acid and Base
Ozone Generator
MV1 Exhaust
EXHAUST
Air
Cooler
CO2 Analyser
Oз Destructor
AIR
Oxidized Fluid
Catch-pot
SAMPLE
OUT
MV3 Cleaning
MV7 Injection
BYPASS
MV9 Manual
MV11 Stream 2
MFC
MV4 Sample In
STREAM 1
STREAM 2
P1 Sample Pump
MANUAL
OXYGEN
MV6 Acid
Oxygen
module
ACID
Mixer P2
P3 Acid Pump
BASE
P4 Base Pump
Reactor
MV5 Sample Out
The Acid and Base Pumps and inject reagents into the reactor.
Built in limitations prevent the reactor from flooding.

47. Install New Reagents: Purge, Pressure Check Phase
Ozone Generator
MV1 Exhaust
EXHAUST
Air
Cooler
CO2 Analyser
Oз Destructor
AIR
Oxidized Fluid
Catch-pot
SAMPLE
OUT
MV3 Cleaning
MV7 Injection
BYPASS
MV9 Manual
MV11 Stream 2
MFC
MV4 Sample In
STREAM 1
STREAM 2
P1 Sample Pump
MANUAL
OXYGEN
MV6 Acid
Oxygen
module
ACID
Mixer P2
P3 Acid Pump
BASE
P4 Base Pump
Reactor
MV5 Sample Out
Both the Sample Out Valve MV5 and the Exhaust Valve are closed. The MFC is programmed with a set-point (40l/h).
Oxygen gas flows through the reactor and as all outlets from the analysis system are closed, after ~15 seconds the oxygen flow will drop below the “Pressure Check Pass” setting. If the flow does not drop, the BioTector generates a fault “Pressure Check Fault” and shuts down.

48. Install New Reagents: Purge, Pressure Check Release
Ozone Generator
MV1 Exhaust
EXHAUST
Air
Cooler
CO2 Analyser
Oз Destructor
AIR
Oxidized Fluid
Catch-pot
SAMPLE
OUT
MV3 Cleaning
MV7 Injection
BYPASS
MV9 Manual
MV11 Stream 2
MFC
MV4 Sample In
STREAM 1
STREAM 2
P1 Sample Pump
MANUAL
OXYGEN
MV6 Acid
Oxygen
module
ACID
Mixer P2
P3 Acid Pump
BASE
P4 Base Pump
Reactor
MV5 Sample Out
The Reactor Valve is opened, and the oxygen pressure in the Cooler and CO2 analyzer purge the sample from the reactor. The MFC is programmed with a new set-point (45 l/h). If the gas flow cannot match the set-point, then it is assumed that there is a blockage in the Sample Valve or Bypass Line. In this case, the BioTector generates a fault “Low O2 flow SO“ and shuts down.

49. Install New Reagents: Purge, Pressure Purge Phase
Ozone Generator
MV1 Exhaust
EXHAUST
Air
Cooler
CO2 Analyser
Oз Destructor
AIR
Oxidized Fluid
Catch-pot
SAMPLE
OUT
MV3 Cleaning
MV7 Injection
BYPASS
MV9 Manual
MV11 Stream 2
MFC
MV4 Sample In
STREAM 1
STREAM 2
P1 Sample Pump
MANUAL
OXYGEN
MV6 Acid
Oxygen
module
ACID
Mixer P2
P3 Acid Pump
BASE
P4 Base Pump
Reactor
MV5 Sample Out
Similar to the Pressure Check Phase, the Sample Out MV5 and Exhaust MV1 Valves are closed. The MFC is programmed with a set-point (60l/h). Oxygen gas starts to flow, and the Cooler and CO2 analyzer are pressurized. As part of the second Pressure Release Phase, the Reactor Mixer runs, the Sample Out Valve is opened, and the oxygen pressure in the Cooler and CO2 analyzer purge any remaining sample from the reactor.

50. Pressure Test Purpose: Frequency of activation: Operation: Note:
To detect a leak or partial leak in the BioTector
Frequency of activation:
Once per day, and when the BioTector analyzer is started
Operation:
The microcontroller activates the MFC with a gas flow of 40 LPH
If there is no leak in the BioTector, the gas flow will drop eventually to 0 LPH
If the gas flow drops below 4 LPH (default Pressure Test Warning setting) within 60 seconds, the pressure test passes
If the gas flow is above 4 LPH but below 6LPH (default Pressure Test fault setting), a pressure test warning is logged
If the gas flow remains above 6 LPH at the end of the pressure test, then the pressure test fails, a fault is logged and the BioTector stops
Note:
1: In addition to the Pressure Test detailed above which operates once per day and each time the BioTector is started, a Pressure Check is carried out as part of the Reactor Purge sequence. The Pressure Check only has pass /fail settings, it cannot generate any warning of a small leak in the BioTector. The default setting is 6 LPH.
2: Pressure Tests are carried out at 400mbar, while the BioTector runs typically at 4mbar, making the Pressure Tests a sensitive leak detection system

51. Flow Test Purpose: Frequency of activation: Operation: Note:
To detect a blockage or partial blockage in a gas flow path BioTector
Frequency of activation:
- Once per day, and when the BioTector is started
Operation:
- The microcontroller activates the MFC with a gas flow of 60 LPH
- The gas flow through the exhaust and sample out valves / lines are tested independently
- If there is no blockage in either of the lines, and the BioTectors flow remains above 45 LPH (default flow warning setting), the flow test passes
- If the gas flow drops below 45 LPH but remains above 30 LPH (fixed Low O2 Flow fault setting) within the 30 second flow test time, a flow warning is logged
- If the gas flow drops below 30LPH, a flow fault is logged and the BioTector stops
Note:
In addition to the Flow Test detailed above which operates once per day and each time the BioTector is started, the gas flow is continuously monitored as the analyzer runs. If the flow falls below 50% of its set-point for >12 seconds, a fault is generated and the BioTector stops

52. Zero Response Check
Go to the Operation, Start Stop menu and run 5 reactions on DI Water using the manual sample port.
If the manual port is not available, use the input point for stream 1.
Confirm that the zero response is correct. If the BioTector has been in storage for a long period, a second “Install New Reagents” cycle or a longer run on DIW may be required.

53. Typical reaction graph result
TIC
Phase
Base Oxidation
Phase
TOC
Phase
If the zero readings and CO2 peaks are correct, then the 6 point pH test in the Commissioning and Start-up check sheet can be skipped. Details of the pH test are in the Process Test PowerPoint presentation.
The above graph shows a typical reaction result.
TIC: When running on DIW, there should be no TIC in the water. Therefore if the DIW is of good quality, then the TIC peak (black peak above), should in fact be a flat line, or very small.
Base Oxidation: If the pH is correct, then a flat line (as shown above) would be expected, as CO2 gas will not be released if the pH is above 12pH.
TOC: There will always be a peak in the TOC phase, produced from impurities in the reagents. However, the peak should be much smaller than the red peak shown above, in fact if the reagents are of good quality, the peak will be much smaller in size than even the black TIC peak on the graph.

54. Span Calibration menu S P A N D J U T 9 : 1 7 2 8 -
< O C . 3 4 I 5 6 R L B H E K G M V m g / l
>
If a span calibration standard is available, program the concentration(s) of the standard solution(s) in the Span Calibration menu.
Otherwise, prepare a calibration standard solution at the necessary concentration. See procedures described in the manual or according to information sheet “R009. Standard Solutions for BioTector Multi-component Analyzer”.
Connect the standard solution to the MANUAL/CALIBRATION port. If both of these ports are not available, use the SAMPLE 1 port. Run the Span Calibration (or Span Check) cycle using the “RUN SPAN CALIBRATION (or RUN SPAN CHECK)” function in Span Calibration menu.

55. Span Calibration menu S P A N D J U T 9 : 1 7 2 8 - R E L
<  O C . 3 4 I S P A N D J U T 9 : 1 7 2 8 - R E L
<  O C . 5 3 4 I
A minimum of five complete span reactions is recommended.
When the “RUN SPAN CALIBRATION” function is used, the system automatically generates the relevant Span Adjust factors.
If the “RUN SPAN CHECK” function is used and if it is necessary to install the Span Adjust factors manually, calculate the average span result by omitting the first two reaction results.
Confirm that the results of the last three reactions are within +/- 3% of reading.
Enter the average result for each measured component (e.g. TIC, TOC etc.) in Span Calibration menu.

56. Data Output menu D A T O U P 9 : 1 7 2 8 -
< E V I C M / S R N H 3 F L 4 G 5 6
>
Download the BioTector “All Data” in text format into the MMC/SD card using the SEND ALL DATA function in Data Output menu to record all changes made in the system configuration.

57. Start the BioTector and confirm the reactions are correct
TIC
Phase
Base Oxidation
Phase
TOC
Phase
Go to Start Stop menu and start the BioTector. When the BioTector is running on-line, carefully observe the first two or three reactions and confirm that the CO2 peaks are correct. The above graph shows a typical reaction result.
TIC: The actual on-line TIC result will depend on the TIC in the sample. It could be more or less than that shown in the example above.
Base Oxidation: If the pH is correct, then a flat line (as shown above) would be expected, as CO2 gas will not be released if the pH is above 12pH.
TOC: The actual on-line TOC result will depend on the TOC in the sample. It could be more or less than that shown in the example above. Note that there will always be a peak in the TOC phase, produced from impurities in the reagents. If the TOC is very low, the peak should be much smaller than the red peak shown above.