Teledyne 6200E - Sulfides Analyzer - Manual (Page 41)

Model 6200E Instruction Manual Frequently Asked Questions & Glossary
M6200E Rev: A1 41
4. FREQUENTLY ASKED QUESTIONS & GLOSSARY
4.1. FAQ’s
The following list contains some of the most commonly asked questions relating to the Model
6200E H
2
S Analyzer.
Q: Why is the ZERO or SPAN key not displayed during calibration?
A: The M6200E disables certain keys whenever the chosen value is out of range for that particular
parameter. In this case, the expected span or zero value is too different from the actually
measured value for the calibration process to be valid.
Q: Why does the ENTR key sometimes disappear on the front panel display?
A: Sometimes the ENTR key will disappear if you select a setting that is invalid or out of the
allowable range for that parameter, such as trying to set the 24-hour clock to 25:00:00 or a
range to more than 20 000 ppb. Once you adjust the setting to an allowable value, the ENTR
key will re-appear.
Q: Can I automate the calibration of my analyzer?
A: Any analyzer with zero/span valve or IZS option can be automatically calibrated using the
instrument’s AutoCal feature.
However, the accuracy of the IZS option’s permeation tube is ±5%. While this may be
acceptable for basic calibration checks, the IZS option is not permitted as a calibration source
in applications following US EPA protocols.
To achieve highest accuracy, it is recommended to use cylinders of calibrated span gases in
combination with a zero air source. Teledyne Analytical Instruments offers a zero air generator
Model 701 and a gas dilution calibrator Model 700 for this purpose.
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 instrument's are properly
calibrated?
A: This most commonly occurs for one or both of the following reasons: (1) a difference in circuit
ground between the analyzer the data logger, or (2) a scale problem with the input to the data
logger. The analog outputs of the analyzer can be manually calibrated to compensate for
either or both of these effects, see Section 6.9.4.2 & 6.9.4.3.
Q: How do I measure the sample flow?
A: Sample flow is measured by attaching a calibrated flow meter to the sample inlet port when
the instrument is operating. The sample flow should be 650 cm³/min ±10%. Section 11.5.2
includes detailed instructions on performing a check of the sample gas flow.
Q: How often do I need to change the particulate filter?
A: Once per week. Table 9-1 contains a maintenance schedule listing the most important, regular
maintenance tasks.