Bacharach H25-IR PRO, Руководство пользователя

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Introduction H25-IR PRO Instruction Manual
6 P/N: 3015-5678 Rev 6
1.5.4. Advanced Leak Quantification (ALQ
ä
) Technology
ALQ
ä
technology eliminates the need to periodically adjust the instrument to a calibrated reference leak source. The result
is an instrument that maintains its accuracy in real time, even under changing conditions. ALQ
ä
technology:
•
eliminates down time for periodic adjustments or instrument checks
•
extends the working life of the probe tip filters
•
makes the instrument impervious to problems that normally could cause inaccurate results.
For example, small leaks that normally could dilute the sample and cause the measured concentration to change have no
effect on the H25-IR PRO. The H25-IR PRO comes standard with ALQ
ä technology.
ALQ ä technology eliminates the need to periodically adjust the instrument, so the H25-IR PRO contains no internal leak
reference. For users who require a “bump test” to verify normal operation, any compatible gas source or reference leak
source can be used. For users who are required to validate instruments against a known reference leak source (due to
company quality policies or practices, for example), an easy-to-use adjustment option is available to set a leak rate multiplier
for the selected target gas (see Adjustment to a Known External Leak Source on page 81). An optional NIST-traceable,
calibrated leak reference is available from Bacharach that may be used for bump testing and/or validation.
1.5.5. Using a Reference Leak Source
An optional Bacharach leak reference may be purchased and established as a reference standard, and used to adjust the H25-
IR PRO’s indicated reading. It features a calibrated output (NIST traceable certification provided) and may be refilled as
needed. The optional Bacharach leak reference is available with most industry-standard refrigerants. Special calibrations on
other refrigerants are available at extra cost. Contact Bacharach for additional information.
Reference leaks provide reliable output when used correctly. However, even the best reference leaks are typically only
accurate to within
±
15% (absolute) of the indicated reading. For example, if the indicated leak rate is 5 g/yr, the actual leak
rate could be anywhere from 5.75 g/yr to 4.25 g/yr. For leak references that do not include a pressure gauge, the tolerance
can be even larger, as the indicated leak rate (usually on the certificate of calibration) is only true at one reference
temperature. The same
±
15% output tolerance combined with varying temperatures means these devices have to be used
very carefully for meaningful results. Refer to the example shown in Figure 1-2 on page 7.
The H25-IR PRO responds to within ±5% of reading (absolute) at reference conditions and maintains this across the specified
operating temperature range (see Figure 1-2 on page 7). Users who need to adjust the H25-IR PRO to their recognized leak
standard may do so within a
±
25% (absolute) tolerance band, to allow for the temperature-affected output tolerance that is
present in reference leaks. Refer to Figure 1-3 on page 8. The user simply applies his leak reference, and uses the H25-IR
PRO keypad to adjust the indicated measurement to match the leak reference value. After the adjustment is applied, the
H25-IR PRO will use its built-in calculations to provide relative leak rates, while ensuring conformance to the required
standard.
NOTE: The factory default reference conditions for the H25-IR PRO refrigerant model are: R134a gas, 100
PPM, and 20
°
C.