HOH Cells - PH testing data

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A study into the PH Output Levels from the HOH Cell

11-08-2007

INTRODUCTION

A study into the PH levels from the HOH gas output has been conducted. It purpose is to establish a baseline for the normal PH level output in the gas stream. A series on control device have been built to provide an repeatable measuring technique along with standard measuring device.

The equipment used for these tests consisted on the following items:

A standard HOH Cell 10% Concentration of electrolyte (NaOH) Alkaline Gas production rate of 1 liter per minute Voltage 12.7V at the cell Amperage 15 AMP This electrolyte reservoir has the standard labyrinth arrangement inside with no additional scrubbing materials in the labyrinth stand and in turn the gas exit port. The cell was operated for 45 minutes to warm up (38ºC) prior to the first test being conducted.
Testing Equipment Equipment consisted of: A standard swimming pool PH testing kit Clamp Amp meter Non contact temperature gauge Multi-meter used for voltage measurement at the cell Water displacement - for volumetric testing
Control Devices Gas Output Container: 10mm Clear PVC Hose Air Filter attached at end 650mil of Water
Test Device A test device has been built to determine what level the PH can be reduced by though a process of bubbling, labyrinths and scrubbing This device consists of : A gas in port (left bottom) A gas bubbler (inside bottom) Labyrinth Arrangement (Inside middle) Gas scrubbing during gas exit (top middle)
Test Device Components Bottom gas entry and gas bubbler
Labyrinth with 1/2" hex nut c/- 1mm centre drilled hole
Gas exit through inside collar, c/- 5 x 1mm holes drilled around collar to centre tube
Stainless Steel Wool inserted into neck of gas exit holes from scrubbing purposes. This specific material was to be unsuitable to to corrosion of the stainless steel which contaminated the cell. It was also found that once the material became saturated it lost is usefuleness

PH Test Baselines


PH 6.8	PH 7.4	PH 7.6	PH 7.8

A PH of 6.8 using standard tap water was present and was used as the starting point for each experiment. Care was taken to ensure equipment was thoroughly cleaned between each test to mitigate contamination. PH level were tested at the beginning of each test demonstration a consistent base of PH 6.8

Each test was conducted for 60 minutes, with measurements taken at 30 minute intervals.

TEST ONE

Using the assembled and seal test device without water internally (dry)
Gas bubbled in to the control container
Testing Data / Results At start: 12.7V at the Cell 15 AMPS 1 Litre Per Minute gas production Temperature at cell 38ºC Starting PH on control container 6.8 30 minutes: 12.7V at the Cell 15 AMPS 1 Litre Per Minute gas production Temperature at cell 39ºC PH in control container 7.4 60 minutes 12.7V at the Cell 15 AMPS 1 Litre Per Minute gas production Temperature at cell 40ºC PH in control container 7.6 Summary: A visible level of moisture can been seen in the test device as pictured, there was small amounts of water in the bottom of the device, 1-2mil approximately. The moisture level was greater bellow the labyrinth by approximately 50% by eye. 80mil of water was used to rinse the inside of this container to provide a PH sample which was recorded at 7.8. The net result saw a decrease in PH by a factor of 0.2 from 7.8 to 7.6 between to the control devices
TEST TWO:
Using the control container again filled with 650mil of water, the gas stream was flowed through this device without the test device directly from the top of the electrolyte reservoir. Testing Data / Results At start: 12.7V at the Cell 15 AMPS 1 Litre Per Minute gas production Temperature at cell 41ºC Starting PH on control container 6.8 30 minutes: 12.7V at the Cell 15 AMPS 1 Litre Per Minute gas production Temperature at cell 42ºC PH in control container 7.8 60 minutes 12.7V at the Cell 15 AMPS 1 Litre Per Minute gas production Temperature at cell 43ºC PH in control container 7.8 Summary: This test established a baseline for PH levels without further conditioning after the gas stream leave the electrolyte reservoir. Previous test had shown that the PH Level moved to 7.8 within 2-3 minutes and was maintained for the duration of the test. In this test the same was observed, though samples were taken at 0, 30 and 60 minute intervals
TEST THREE
In this test the labyrinth device was filled with 650mil of water and so too was the control container. Testing Data / Results At start: 12.7V at the Cell 15 AMPS 1 Litre Per Minute gas production Temperature at cell 43ºC Starting PH on control and labyrinth container 6.8 30 minutes: 12.7V at the Cell 15 AMPS 1 Litre Per Minute gas production Temperature at cell 44ºC PH in control container 7.4 60 minutes 12.7V at the Cell 15 AMPS 1 Litre Per Minute gas production Temperature at cell 44ºC PH in control container 7.6 Summary: PH levels were measured in the Test Device at the conclusion of this test (60 minutes) it recorded a PH level of 7.8 As can been seen in the image right, the moisture level concentrated below the labyrinth arrangement, leaving the top third mostly clear of moister. A reduction of PH 0.2 was measured between test device and the control device.

Conclusion:
Test	Time (min)	Volt	Amp	LPM	Temp	PH
1	0	12.7	15	1	38ºC	6.8
1	30	12.7	15	1	39ºC	7.4
1	60	12.7	15	1	40ºC	7.6
2	0	12.7	15	1	41ºC	6.8
2	30	12.7	15	1	42ºC	7.8
2	60	12.7	15	1	43ºC	7.8
3	0	12.7	15	1	43ºC	6.8
3	30	12.7	15	1	44ºC	7.4
3	60	12.7	15	1	44ºC	7.6

Interestingly there was no difference recorded between test 1 and test 3, where in the first test device was dry and in the third test the test device had 650mil of water in it, which appeared to make no difference to the PH reading in the control device.

NEXT STEPS

As a result of the study the develop of a more suitable gas drying and arresting configuration with be investigated.

The results for this investigation can be found here:

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