Teledyne T100, Инструкция по эксплуатации, Страница: 300 / 404

Troubleshooting & Repair Teledyne ML - T100 UV Fluorescence SO2 Analyzer
300 06807A(DCNxxxx)
23. Adjust gain adjustment potentiometer until the NORM PMT value is ±10 mV of the
target level from Step 16.
24. Perform span and zero-point calibrations (refer to Section 6) to normalize the sensor
response to its new PMT sensitivity.
25. Review the slope and offset values, and compare them to the values in Table 6-5.
10.8. FREQUENTLY ASKED QUESTIONS (FAQs)
The following list contains some of the most commonly asked questions relating to the
T100 SO
2
Analyzer.
QUESTION ANSWER
Why is the ZERO or SPAN key not
displayed during calibration?
The T100 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 400 ppb but gas concentration
being measured is only 50 ppb.-For more information, refer to Section 10.4.4 and
Section 10.4.5.
Why does the ENTR key sometimes
disappear on the Front Panel Display?
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
a DAS 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.
How do I enter or change the value of
my Span Gas? Press the CONC key found under the CAL or CALS buttons of the main SAMPLE
display menus to enter the expected SO
2
span concentration.-Refer to Section
3.7.1.3 or for more information.
Why does the analyzer not respond to
span gas? Section 10.4.4 has some possible answers to this question.
Can I automate the calibration of my
analyzer? 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 offers a zero
air generator Model 701 and a gas dilution calibrator Model T700 for this purpose.
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? 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 T100 can be
manually adjusted to compensate for either or both of these effects, refer to 4.8.4.4;
-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 (refer to
Section 4.8.4.2). Alternately, use the data logger itself as the metering device during
calibrations procedures.
How do I perform a leak check? Refer to Section 8.3.6.
How do I measure the sample flow? 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