E Instruments E500 - Measurement Units Matching → Abbreviations

68
MEASURE
DEFINITION
ηt (HHV)
Total efficiency in relation to the Higher Heating Value:
Total efficiency. It is the sum of sensible efficiency and condensation efficiency. It is re-
ferred to HHV (Higher Heating Value) and can not exceed 100%.
Qt (HHV)
Total stack losses:
It is the total heat percentage dissipated through the stack.
NOx
Measure of nitrogen oxides quantity; the measurement unit can be set in the special
menu.
NOx ppm *
Measure of nitrogen oxides quantity; the measurement unit can not be set but it is fixed in
ppm.
NOx (rif. O2)
Measure of nitrogen oxides quantity referring to O2; the measurement unit can be set in
the special menu.
NOx (rif. O2) ppm *
Measure of nitrogen oxides quantity referring to O2; the measurement unit can not be set
but it is fixed in ppm.
PI
Poison Index (CO/CO2 ratio):
It is defined as the ratio between CO and CO2 useful to determine whether the system
needs maintenance.
CO
CO quantity measurement. Measurement units: ppm - mg/m
3
- mg/kWh - ng/J - g/GJ -
g/m
3
- %
CO (RIF)
CO quantity measurement with O2 reference. Measurement units: ppm - mg/m
3
- mg/kWh
- ng/J - g/GJ - g/m
3
- %
* : Valid for Piemonte region only (Italy only).
Measurement units matching → abbreviations
ppm
p
mg/m
3
g
mg/Kwh
w
g/m
3
G
g/Kwh
W
g/GJ
J
ng/J
J
hPa
h
Pa
P
mbar
b
mmH
2
O
H
mmHg
g
inH
2
O
i
psi
p
°C
C
°F
F
m
m
ft
ft