Teledyne GFC 7001E User Manual download pdf (Page 57)

FAQs Model GFC7001E Carbon Dioxide Analyzer

Teledyne Analytical Instruments 57

4. FREQUENTLY ASKED QUESTIONS

4.1. FAQ’S

The following is a list from the Teledyne’s Customer Service Department of the most commonly asked questions

relating to the GFC 7001E/EM CO Analyzer.

Q: Why does the ENTR key sometimes disappear on the Front Panel Display?

A: During certain types of adjustments or configuration operations, the ENTR key will disappear if you select

a setting that is nonsensical (such as trying to set the 24-hour clock to 25:00:00) or out of the allowable

range for that parameter (such as selecting an iDAS hold off period of more than 20 minutes).

Once you adjust the setting in question to an allowable value, the ENTR key will re-appear.

Q: Why is the ZERO or SPAN key not displayed during calibration?

A: The GFC 7001E/EM disables certain these keys expected span or zero value entered by the users is too

different from the gas concentration actually measured value at the time. This is to prevent the accidental

recalibration of the analyzer to an out-of-range response curve.

EXAMPLE: The span set point is 40 ppm but gas concentration being measured is only 5 ppm.

For more information, see Sections 13.3.3 and 13.3.4.

Q: How do I enter or change the value of my Span Gas?

A: Press the CONC key found under the CAL or CALS buttons of the main SAMPLE display menus to enter

the expected CO span concentration.

See Section 3.6.2.3 or Zero/Span Calibration3.6.2.4 for more information.

Q: Why does the analyzer not respond to span gas?

A: Section 13.3.3 has some possible answers to this question.

Q: Is there an optional midpoint calibration?

A: There is an optional mid-point linearity adjustment; however, midpoint adjustment is applicable only to

applications where CO measurements are expected above 100 ppm. Call Teledyne’s Service Department

for more information on this topic.

Q: What do I do if the concentration on the instrument's front panel display does not match the value recorded or

displayed on my data logger even if both instruments are properly calibrated?

A: This most commonly occurs for one of the following reasons:

 A difference in circuit ground between the analyzer and the data logger or a wiring problem;

 A scale problem with the input to the data logger.

The analog outputs of the GFC 7001E/EM can be manually adjusted to compensate for either or both of

these effects, see Section 7.4.5;

 The analog outputs are not calibrated, which can happen after a firmware upgrade.

Both the electronic scale and offset of the analog outputs can be adjusted (see Section 7.4.3).

Alternately, use the data logger itself as the metering device during calibrations procedures.

Q: How do I perform a leak check?

A: See Section 12.3.3.

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Teledyne GFC 7001E User Manual Page 57