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Resumen del manual
Text Box: THERE ARE 4 STEPS: Text Box: U HOW TO: SILENCE ALARMS on the HGM300 Text Box: STEP #2: PRESS THIS BUTTON, which will take you to the “ALARM SUMMARY SCREEN”. Text Box: STEP #3: Each alarm must be acknowledged separately. To do that PRESS THIS BUTTON and go to the “ALARM DETAIL SCREEN”. Text Box: STEP #4: PRESS THIS BUTTON TO ACKNOWLEDGE THIS ALARM. ANY OTHER ALARMS WILL HAVE TO BE DEALT WITH IN THIS WAY TO SHUT OFF THE ALARM HORN! IF REFRIGERANT GAS IS STILL LEAKING INTO THIS ZONE THE ALARM WILL KEEP GOING OFF UNTIL THE LEAK IS FIXED! UReturn to either the System screen or the Zone screen after acknowledging the alarm! HGM300 Refrigerant Gas Leak Monitor NDIR Bench Measurement Description Pyroelectric Detector Sample Flow NDIR Source Dual Optical Bandwidth Filters Gas passing through the bench absorbs some I-R energy. Each of the 24 gasses in the onboard library has a very specific absorption signature defining the amount of energy any of these gasses will absorb in relation to the concentration present at the time of measurement. In order to increase accuracy and eliminate false alarms a narrow (8.1 to 9.4 uM) optical bandwidth filter is used to limit the optical spectrum to only those gasses listed in our library. All gasses outside of this bandwidth are ignored. The output voltage from the pyroelectric detector is processed to eliminate any extraneous noise, amplified, and digitized. This information is then sent to the onboard microcontroller, which analyzes and displays the data. The unit is purged automatically which brings in a clean air sample. This air sample contains no refrigerant gas, therefore, does not absorb any I-R energy. The energy measured in this purge sample is used as a reference or baseline, when calculating PPM values for actual input channels, which allows us to compensate for any changes that may occur over time in the measurement electronic circuitry, I-R source, or I-R detector. This also eliminates for field calibration of the unit. All measurements are temperature and pressure compensated to standard conditions to eliminate reading variability due to the climate or altitude of the unit. What specifically makes the HGM300 Single-Beam-Single-Wavelength NDIR measuring bench so different? 1.) We gold plate the inside of the sampling tube. Gold is virtually untarnishable so this improves the reflecting properties of the optical path, which improves overall measurement bench sensitivity and accuracy. 2.) Because the optical properties have been improved we can reduce lamp intensity thereby improving the I-R source life, which improves long-term reliability. We estimate source life to be beyond 5 years. 3.) I-R source modulation is required of all such devices. We do this electronically thereby eliminating any mechanical parts and improving long-term reliability. 4.) Sample temperature changes can directly affect short-term measurement stability. Our auto rezeroing function engages every 10 minutes or whenever the sample temperature changes by more than 0.2 deg. C, or the enclosure interior temperature changes by more than 2.0 deg. C. Thereby, improving measurement stability and accuracy, and completely eliminating the effects of sample- component temperature drift anywhere in the monitor. 5.) Auto zeroing or purging has other benefits. We discussed how it’s used to provide a zero base for comparison to the sample measurement. This, also, allows us to monitor and compensate for changes in I-R drive circuitry, source, bench, detector, and other electronic components. Again this all adds to long-term reliability and accuracy. 6.) Our narrow band filters limit the I-R range from 8.1 to 9.4 uM. These optical devices cannot fluctuate in any way. They eliminate interference from gasses with absorbencies outside this range. As it happens, humidity, which can absorb I-R energy and create erroneous readings, does not absorb I-R energy within this range. Our measuring bench, because of this filter, cannot measure in any other range adding to basic stability and accuracy. 7.) All measurements are pressure and temperature compensated so that there is never a question arising from local weather or altitude issues. We always provide the same information regardless of the location of our equipment. 8.) Our measurements, and this is one of the most important things we do, are a function of real time, on board calculations of Absorbance Units, based upon the Beer-Lambert Law. This provides a linear bench output, which, when coupled with our proprietary control algorithm, gives us better full-scale resolution. We do not simply measure a voltage and compare it to a value on a look up table. That method provides a logarithmic output, which has good low-end but poor high-end resolution. The bottom line is that we have taken a very simple, rugged, stable measuring bench design and by incorporating state-of-the-art technology we’ve enhanced it into a virtual solid state, field replaceable, low cost...
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