D
ISPLAY
P
A RA M E T ERS
O
N
UE
I
C
OMBUST ION
A
NA LY ZERS
• T F ( F lue Te m p e r a t u r e) Used to calculate net temperature in Fa h r enheit or Centigrade. Will
s h o w ambient temperature after fresh air calibration and ‘
- OC -
’ if the flue probe is disconnected.
•
∆
T ( Net Te m p e r a t u r e ) I ndicated by
∆
T (Greek letter delta for difference)
- Di f f e r ential of flue temperature minus ambient (or inlet if set) temperature
- Di f f e r ential of T1 - T2 on C125 and C127
• O 2 (Oxygen) Di r ect reading of oxygen from the O2 sensor reading in percentage (%)
• CO Carbon Mo n o xide reading displayed in ppm (parts per million). ‘- - - -’ or ‘- OC -’ is
d i s p l a y ed if there is a fault with the CO sensor or the instrument has not set to ze r o corre c t l y, switch
off instrument and try again.
• CO2 Calculated from the fuel selected and the measured O2 leve l
- 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 - A i r ( E xcess Air)
- Indicated by
_
( Greek small case lambda) or ‘ X ’ on scre e n
- Indicated by XAIR % on the printout
- Excess air is a calculation of the percentage of oxygen above what is theoretically re q u i r ed for
complete combustion
- Is re q u i r ed 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 ( Ef f i c i e n c y )
- Indicated by _ (Greek letter eta) followed by G for gross, N for net or C for condensing on the
s c r een if the analyzer has these options
- Indicated by Eff (G) on the printout if set to Gross (used in the St a t e s )
- 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
• Lo s s (
∆
in the display)
- Total losses calculated from Combustion T h e o r y. This is the summation of the next three parameters
• Dry %: Calculated heat lost turning the Carbon in the fuel to Carbon Di o xide (CO2)
• Wet %: Calculated heat lost turning the Hyd r ogen in the fuel into water (H20)
• CO Loss %: Calculated loss due to partially burnt Carbon. Any Carbon Mo n o xide
(CO)in the flue has the potential to be turned into Carbon Di o xide and release more
heat, thus this heat is lost up the flue
• CO AF (Carbon Mo n o xide Air-Free) Reading re f e renced 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.
• A MB Air INLET temperature used to calculate the NET temperature.
• CO / CO 2 (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 re a d i n g .
• How clean the boiler is ru n n i n g .
- 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.
GLOSSARY
18
(6 páginas)
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