4 wire oximeter
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4 wire oximeter
I have a 4 wire oximeter that I am actually trying to use to measure the oxidation and reduction of the exhaust of my ceramic kiln. In order to do this, I have to figure out which two of the four colored wires coming out of it are for the HEGO and which are for the heater. I need to measure the resistance across the HEGO leads. Can anyone tell me the colors of the two wires for the HEGO.
Thanks Larry
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Thanks Larry
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From: sunnyvale
if i knew what the hell you are talking about i might help out. if you have a clamp on meter i would guess the tow with the highest voltage are to the heater and the other to are to your oxidation unit! but i cant tell you for sure
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Sorry I was not clear.
The oximeter is not on a vehicle and there is no voltage to it. It is mounted where the 2000 degree gas comes out of my propane pottery kin. I want to measure the change in the oxygen level of the emitted hot gas. I understand that as the oxygen level drops the resistance across the two wires to the oximeter itself, as opposed to those to the pow wires going to heating element. I am trying to figure out which are the two heating wires and which are to the oximeter itself. I need the colors of the oximeter wires.
Thanks for your help.
The oximeter is not on a vehicle and there is no voltage to it. It is mounted where the 2000 degree gas comes out of my propane pottery kin. I want to measure the change in the oxygen level of the emitted hot gas. I understand that as the oxygen level drops the resistance across the two wires to the oximeter itself, as opposed to those to the pow wires going to heating element. I am trying to figure out which are the two heating wires and which are to the oximeter itself. I need the colors of the oximeter wires.
Thanks for your help.
Cargo Master
Joined: Apr 2003
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From: Frequently frozen MN
I'm reasonably sure that you could figure it out with a meter.
Measure the resistance between the various wires. The pair with the lowest resistance between them should be the heater.
Please note that if this is a standard automotive heated O2 sensor, the sensing wires do not lower the resistance. They actually generate a voltage that depends on the level of Oxygen. That being said, your meter probably won't work unless you hook the sensor pair up to the correct polarity. (Maybe you'll see it try to read below the minimum) .
Also, they will work without the heater element, but they will have to stay in the heated area long enough for them to warm up. However, I do wonder about the 2000 degrees. Pretty sure that auto exhausts are a lot cooler in the O2 sensor area.
There are more complex types (wide band), but they're pretty rare.
For more info than you probably want to know
Oxygen sensor - Wikipedia, the free encyclopedia
Good Luck,
hj
Measure the resistance between the various wires. The pair with the lowest resistance between them should be the heater.
Please note that if this is a standard automotive heated O2 sensor, the sensing wires do not lower the resistance. They actually generate a voltage that depends on the level of Oxygen. That being said, your meter probably won't work unless you hook the sensor pair up to the correct polarity. (Maybe you'll see it try to read below the minimum) .
Also, they will work without the heater element, but they will have to stay in the heated area long enough for them to warm up. However, I do wonder about the 2000 degrees. Pretty sure that auto exhausts are a lot cooler in the O2 sensor area.
There are more complex types (wide band), but they're pretty rare.
For more info than you probably want to know
Oxygen sensor - Wikipedia, the free encyclopedia
Good Luck,
hj
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Cargo Master
Joined: Apr 2003
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From: Frequently frozen MN
I thought about this some more, and actually the easiest way might be to check for voltage.
From what I've read, the actual sensor leads, on an O2 sensor, always have some small voltage between them. Supposedly it varies between about 0.2 and 0.9 v.
So, if you set the voltmeter to the lowest scale ( generally 2v), and see which 2 cause any slight reading, those should be the actual sensor.
hj
From what I've read, the actual sensor leads, on an O2 sensor, always have some small voltage between them. Supposedly it varies between about 0.2 and 0.9 v.
So, if you set the voltmeter to the lowest scale ( generally 2v), and see which 2 cause any slight reading, those should be the actual sensor.
hj
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