UEi Test Instruments C127OILKIT - Manual (Page 18)

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• TF (Flue Temperature) Used to calculate net temperature in Fahrenheit or Centigrade. Will
show ambient temperature after fresh air calibration and ‘- O C - ’ if the flue probe is disconnected.
• ∆T (Net Temperature)Indicated by ∆T (Greek letter delta for difference)
- Differential of flue temperature minus ambient (or inlet if set) temperature
- Differential of T1 - T2 on C125 and C127
• O2 (Oxygen) Direct reading of oxygen from the O2 sensor reading in percentage (%)
• CO Carbon Monoxide reading displayed in ppm (parts per million). ‘- - - -’ or ‘- OC -’ is
displayed if there is a fault with the CO sensor or the instrument has not set to zero correctly, switch
off instrument and try again.
• CO2 Calculated from the fuel selected and the measured O2 level
- Will display “----“ or “-O>-” if the oxygen level is too high to calculate CO2
- Only displays a reading during combustion test. ‘- - - -’ or ‘- O > -’ is displayed while in fresh air.
• X-Air (Excess Air)
- Indicated by _ (Greek small case lambda) or ‘ X ’ on screen
- Indicated by XAIR % on the printout
- Excess air is a calculation of the percentage of oxygen above what is theoretically required for
complete combustion
- Is required to completely burn all of the fuel due to poor mixing and to assist in venting flue gases
- Only displays a reading during combustion test. ‘- - - -’ or ‘- O > -’ is displayed while in fresh air.
• Eff (Efficiency)
- Indicated by _ (Greek letter eta) followed by G for gross, N for net or C for condensing on the
screen if the analyzer has these options
- Indicated by Eff (G) on the printout if set to Gross (used in the States)
- Eff (N) or Eff (C) for the other scales (based on standards for that location)
- Is calculated based on gas readings, net temperature and fuel selected.
- This value is combustion efficiency, not appliance efficiency
• Loss (∆ in the display)
- Total losses calculated from Combustion Theory. This is the summation of the next three param-
eters
• Dry %: Calculated heat lost turning the Carbon in the fuel to Carbon Dioxide (CO2)
• Wet %: Calculated heat lost turning the Hydrogen in the fuel into water (H20)
• CO Loss %: Calculated loss due to partially burnt Carbon. Any Carbon Monoxide
(CO)in the flue has the potential to be turned into Carbon Dioxide and release more
heat, thus this heat is lost up the flue
• CO AF (Carbon Monoxide Air-Free) Reading referenced to an oxygen level of 0%. Do not confuse this
reading with the actual CO reading as detailed above. See the Combustion Efficiency Calculation
sections for more details.
• AMB Air INLET temperature used to calculate the NET temperature.
• CO/CO2 (CO/CO2 Ratio) The ratio of measured CO divided by calculated CO2.
- It gives an indication of:
• How good a gas sample the instrument is reading.
• How clean the boiler is running.
- For example: A new or clean domestic boiler will display a ratio of less than 0.004, a unit in need
of cleaning 0.004-0.008 and a unit in need of major overhaul will show greater than 0.008.
- Only displays a reading during combustion test. ‘- - - -’ is displayed while in fresh air.
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LOSSARY
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