Hach BioTector B3500e, User Manual

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Page 80
8.1.1.5 pH Test
The user must understand the procedure for testing the pH in the BioTector.
Use eye protection and gloves. Have all the relevant parts for this test ready
(primarily beaker and pH paper) before carrying out the test.
For the pH test to be accurate, the previous reaction should have finished
normally, so that any liquid carried over from that reaction will not affect the pH
test.
Significant volume of liquid loss, during the pH test phases 1, 2, 3 or 4, may
have an impact on the consecutive pH tests. In such cases, the test must be
stopped at that specific phase, where the significant volume of liquid is lost,
and re-started from pH Test Phase 1 below. When the pH test is re-started, the
corresponding pH measurements can be skipped for the previous valid tests.
General overview of the operation of the pH test:
The description below is for the TIC & TOC mode.
Phase 1:
Prepare the test equipment, and start the test.
Phase 2: The BioTector carries out a normal startup operation, including ozone purge, reactor purge,
pressure test and flow test to ensure that the system is purged and leak tight.
Phase 3: The TIC acid and sample are added into the reactor, mixed and then the program pauses, to
allow the pH to be tested.
Phase 4: The base is added to the solution in the reactor, and then the program pauses, to allow the
pH to be tested.
Phase 5: The TOC acid is added to the solution in the reactor, and then the program pauses, to allow
the pH to be tested.
Phase 6: The reactor and CO
2
analyzer are purged.
pH Test, Phase 1:
P H T E S T 0 9 : 1 7 : 2 8 1 2 - 0 9 - 0 2
1 < R A N G E , V A L V E 1 , S T R E A M 1
2 M O D E T I C + T O C
3 S T A R T T E S T
4 T A K E S A M P L E
5 C O N T I N U E T O N E X T P H A S E
6 S T O P T E S T
This menu enables the user to test the pH in the BioTector.
1. Range, Valve.
Select the range and the stream or manual sample point the pH test is going to run on.
This function has an effect on the volume of sample, acid and base used for the test.
2. Mode. Depending on the analysis type of the BioTector, the test mode can be selected as TIC+TOC
mode, TC mode or TIC REACTOR mode. In TIC & TOC systems, the only available test mode is TIC &
TOC. In TC systems, the only available test mode is TC. If the BioTector is a VOC system, the user can
choose to run the test in either TIC+TOC or TC modes.
WARNING