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Troubleshooting & Service Model T101 Instruction Manual
240
9.7. FREQUENTLY ASKED QUESTIONS (FAQS)
The following list contains some of the most commonly asked questions relating to the
T101.
QUESTION ANSWER
Why is the ZERO or SPAN
button not displayed during
calibration?
The T101 disables these buttons when the 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.
Why does the ENTR button
sometimes disappear on
the Front Panel Display?
During certain types of adjustments or configuration operations,
the ENTR button 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 button will re-appear.
How do I enter or change the
value of my Span Gas?
Press the CONC button found under the CAL or CALS menus of the main
SAMPLE menu to enter the expected SO
2
span concentration.
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 API 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 T101 can be manually adjusted to
compensate for either or both of these effects, refer to 4.6.3.4;
-The a
n
alog 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 4.6.3.2). Alternately, use the data
logger it
se
lf as the metering device during calibrations
procedures.
How do I perform a leak
check?
Refer to Section 9.5.1.
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 10%. Section 9.5.2 includes
det
a
iled instructions on performing a check of the sample gas
flow.
07266B DCN6485