Thermo Scientific 5028i Instruction Manual page 144

Calibration
Pre-Calibration
Pre-Calibration
Calibration Procedure
RH/Temperature
Calibration
4-2 Model 5028i Instruction Manual
nearest 0.1 °C. This thermometer should be referenced to within
an accuracy of ±0.5 °C to NIST-traceable precision thermometers.
Multiple thermometers may be used to cover the temperature range
as long as each thermometer meets the accuracy and readability
specifications described above.
A barometer capable of measuring barometric pressure over a range
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of 600 to 800 mmHg (80 to 106 kilo Pascals [kPa]) and readable
to the nearest 1 mmHg. At least once a year, this barometer should
be calibrated to within ±5 mmHg of a NIST-traceable barometer of
known accuracy.
Flow-rate Transfer Standard (FTS) measurement equipment capable
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of calibrating, or verifying, the volumetric flow rate measurement
with an accuracy of ±2 percent. This flow rate standard must be a
separate, stand-alone device. It must have its own certification and
be traceable to a NIST primary standard for volume or flow rate.
Dry-piston meters and bubble flow meters should only be used
under controlled laboratory conditions. Ambient field measurements
should use a NIST-traceable low pressure drop orifice/venturi flow
meter (such as, BGI Delta-Cal) or a Streamline Pro™ Model SX Kit
(2-25 L/min).
A relative humidity (RH) standard capable of measuring in the
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range of 35-75% RH, readable to the nearest 0.5% RH and accurate
to within 2% RH.
Prior to calibration, be sure the Model 5028i is operating properly.
The Model 5028i's internal diagnostics makes this a quick and simple
process. Turn on the instrument and allow it to stabilize for one hour
prior to calibrating. If you are receiving this instrument for the first
time, the optional acceptance testing in the "Installation" chapter
should also be reviewed. If the internal flow temperature sensor requires
calibration, the dynamic heating system should be turned OFF, the
cover should be removed, and the instrument should sample room
temperature air at least one hour prior to calibrating.
The order of calibration described below is preferred for optimal
performance of the 5028i and comes from many years of experience
working with and developing ambient particulate monitoring
instrumentation. The Calibration submenus allow the user to view and
calibrate the instrument. All calibration submenus are visible only when
the instrument is in service mode. For more information on the service
mode, see "Service Mode" earlier in Chapter 3.
All screens that appear in this chapter have been referenced in the
previous chapter.
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