YOKOGAWA EXAxt ZR22G, User Manual, Page: 128 / 211

<8. Detailed Data Setting>
8-15
IM 11M12A01-02E 16th Edition : Mar. 19, 2020-00
(5) Select “Set period over which maximum and minimum is stored” and numerical entry display
appears. To set 48 hours, enter 048. Entry range is 1 to 255 hours.
Set period over which
average is calculated:
1 h

Set period over which
maximum and minimum is
stored: 2 4 h
Enter
Averaging
F8.14E.ai
Figure 8.14 Setting Average-Value Calculation Periods and
Maximum- and Minimum-Value Monitoring Periods
n
Default Values
“Set period over which average is calculated” is set to 1hr, and “Set period over which maximum
and minimum is stored” is set to 24 hrs prior factory shipment or after data initialization.. .
8.6.3 Setting Fuels
n
Input Parameters
The analyzer calculates the moisture content contained in exhaust gases. The following sets
forth the fuel parameters necessary for calculation and their entries. The moisture quantity may
be mathematically expressed by:
(water vapor caused by combustion and water vapor contained in the exhaust gas)
Moisture quantity =
= (Gw + Gw1)/G x 100
=
where,
Ao : Theoretical amount of air per unit quantity of fuel, m 3 /kg (or m 3 /m 3 ) ... 2 in Table 8.8
G: Actual amount of exhaust gas (including water vapor) per unit quantity of fuel, m 3 /kg (or m 3 /m 3 )
Gw : Water vapor contained in exhaust gas per unit quantity of fuel (by hydrogen
and moisture content in fuel), m 3 /kg (or m 3 /m 3 ) ............ 1 in Table 8.8
Gw1: Water vapor contained in exhaust gas per unit quantity of fuel (moisture content
in air), m 3 /kg (or m 3 /m 3 )
Go: Theoretical amount of dry exhaust gas per unit quantity of fuel, m 3 /kg (or m 3 /m 3 )
m: Air ratio
X : Fuel coefficient determined depending on low calorific power of fuel, m 3 /kg (or m 3 /m 3 ) ....... 3 in Table 8.8
Z : Absolute humidity of the atmosphere, kg/kg ....... Figure 8.16
X + Ao x m
Gw + (1.61 x Z x m x Ao )
actual exhaust gas (including water vapor) per fuel
+ (water vapor contained in air for combustion)
x 100
Gw + (1.61 x Z x m x Ao)
Go + Gw + [(m - 1) Ao + (1.61 x Z x m x Ao)]
x 100
x 100
..... Equation 1
............ Equation 2
Fill in the boxes with fuel parameters in Equation 2 above to calculate the moisture content.
Use Ao, Gw and X shown in Table 8.9. If there are no appropriate fuel data in Table 8.9, use the
following equations for calculation. Find the value of “Z” in Equations 1 and 2 using Japanese
Standard JIS B 8222. If a precise measurement is not required, obtain the value of “Z” using a
graph for the absolute humidity indicated by a dry and wet bulb hygrometer.