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Technical Support FAQ

6400 - Flourescent SO2 Analyzer

How do I change the analyzer range(s)?
I need to wire a STATUS output to my system which accepts a dry contact. How do I do this?
I need to configure my analyzer for a difference voltage and frequency. How do I do this?
How low of a voltage can be applied to a unit configured for 220 VAC?
Is there an issue to operate the analyzer on a different power frequency than which it was configured (e.g. apply 50 Hz power to a 60 Hz unit)?
What is the pressure rating of the auto-calibration valves?
I wish to connect an external electromechanical relay to one of the status signals which is an open collector output inside the unit. If I use the internal 5V power supply to power the external relay, how much voltage may drop across the internal open collector transistor?
When performing a manual zero or span calibration, the ZERO or SPAN button does not appear where the procedure says it should. Why not?
What is the rating of the relay alarm contacts?
How do I rebuild a KNF pump?
Does the 6400 have to have zero air for zero calibration or will zero nitrogen also do? Our customer is in the process of calibrating their 6400 and they do not have zero air. They would like to use pure N2 if applicable. Please advise.


How do I change the analyzer range(s)?

The ranges can be configured by following this procedure.

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I need to wire a STATUS output to my system which accepts a dry contact. How do I do this?

The STATUS outputs do not provide a dry contact output, so you will require an external relay with 5 VDC coil. Wire the positive terminal of the relay coil to the + STATUS connection and the negative terminal of the relay coil to the desired STATUS output to monitor. Additionally a jumper will be needed between the D and ground (far right) terminals. Your relay output will then act as a dry contact for this output.

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I need to configure my analyzer for a difference voltage and frequency. How do I do this?

Please click on this link to view the note addressing the voltage and frequency dependent changes.

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How low of a voltage can be applied to a unit configured for 220 VAC?

The analyzer should work as low as 198 VAC.

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Is there an issue to operate the analyzer on a different power frequency than which it was configured (e.g. apply 50 Hz power to a 60 Hz unit)?

It is recommended to make the approach frequency jumper modification to operate the unit at a different frequency. Please contact the factory for details on the appropriate part number(s) and instructions.

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What is the pressure rating of the auto-calibration valves?

The valves are rated for 75 psig closed and 15 psig open.

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I wish to connect an external electromechanical relay to one of the status signals which is an open collector output inside the unit. If I use the internal 5V power supply to power the external relay, how much voltage may drop across the internal open collector transistor?

The voltage drop across the transistor is load-dependent, but is generally about 1.0-1.5 V. Since it is difficult to source relays to run at such a low coil voltage, using an external power supply instead of the internal supply to assure the relay is turned on is recommended.

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When performing a manual zero or span calibration, the ZERO or SPAN button does not appear where the procedure says it should. Why not?

The detector must see a certain threshold achieved for button to appear to initiate that calibration. In the case of zero, the reading must be under a level (e.g. 0.5 ppb) to allow a zero and for the span, the signal must fall within a range of acceptability based on the concentration. These thresholds may be configuration-dependent and can be found in the Manual Calibration section of the manual.


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What is the rating of the relay alarm contacts?

The relays are rated 10A @ 125 VAC and 6A @ 277 VAC

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How do I rebuild a KNF pump?

A service note with complete instructions is available here. - PDF.

Note: It is best to overtighten the screw in the center rather than undertighten it. If undertightened, pump damaged will result.

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Does the 6400 have to have zero air for zero calibration or will zero nitrogen also do? Our customer is in the process of calibrating their 6400 and they do not have zero air. They would like to use pure N2 if applicable. Please advise.

Pure N2 will not work to zero the 6400E analyzer, unless you plan on operating it in a background of N2. Oxygen acts as a quenching agent and will attenuate the signal some. So if you flow zero air calibrate and then flow N2, your reading will be elevated.

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