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13 Cards in this Set
- Front
- Back
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Define oxidizer |
A substance that grabs electrons from anywhere it can |
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If a substance gains electrons what is it said to be? |
Reduced |
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If a substance loses electrons what is it said to be? |
Oxidized |
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What does an ORP directly measure? |
The flow of electrons. Also the 'oxidation-reduction potential' |
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What compound is typically used as a dechlorinating agent for plant effluent? |
Sulfur Dioxide |
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How is the oxidation-reduction potential measured by an ORP Probe? (units) |
In millivolts |
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As chlorine concentration increases, what is happening to electrons at the electrodes? |
The sensing electrode will shed more electrodes (the chlorine is grabbing them) relative to the reference electrode. |
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What is the effect on oxidation reduction potential when organic matter is present? |
The oxidation reduction potential decreases because chlorine is reduced when it pulls electrons from the organic material's cell membranes. |
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At what point does the ORP probe trigger a chlorine addition signal? |
When the SENSING electrode drops below the millivolt set point (typically 580-650 millivolts (is this positive or negative?)) |
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How does the ORP probe send a chlorine addition signal? |
A 4-20 milliamp signal is sent to the chlorine controller |
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Is bacteria an oxidizing or reducing agent? |
Reducing agent |
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What would a reading of -900 millivolts signal? |
Nothing. There's already too much chlorine. As the reading gets 'less negative' down to the set point (e.g. 580 mV), the signal will trigger at the set point. |
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Describe the tradeoff of the ORP position in the flow stream |
Position is a tradeoff between time for reaction and compliance. |
