27 Model 7500 Instruction Manual
Teledyne Analytical Instruments
5.3 Overview of display screen
(1) Measurement mode screen
On turning on the power switch, the Measurement Mode screen will appear.
The measurement screen depends on the number of components. The following screen conguration
shown as an example is for CO2, CO, O2 (Output at channel 6).
When channel 5 or later is displayed, scroll up or down key to view another conguration which is beyond
the screen.
No. Name Function No. Name Description
1 Component
display
Displays component
of instantaneous
value, converted
instantaneous value,
converted average
value, etc.
5 Peak alarm
component
display
Displays peak alarm
component.
2 Concentration
display
Displays measured
value of concentration.
6 Peak alarm
concentration
display
Displays peak alarm
concentration (Upper
limit value).
3 Range display Displays range
values.
7 Peak alarm count Displays the alarm
times exceeding the
peak value.
4 Unit display Displays unit with ppm
and vol%.
8 Peak alarm unit
display
Displays unit of peak
alarm with times/h.
Fig. 5-3 Name and function of measurement mode screen
• Instantaneous value and concentration value:
The concentration display of CH (component) where sampling components such as “CO2”, “CO” or
“O2 are displayed in the component display, indicates current concentration values of the measured
components contained in gas that is now under measurement.
• O2 correction concentration values:
CH (components) where “cv**” is displayed as “cv CO” in the component display are calculated from the
following equation, by setting sampling components, O2 instantaneous / concentration values and O2
correction reference value (see item 6.8).
Conversion output=
On: The value of the O2 correction reference value (Value set by application)
Os: Oxygen concentration (%)
Cs: Concentration of relevant measured component
K: The value of the fractional part is this equation.
Where, K is When K ≥ 4, K=4. When K < 0, K=4. When Cs < 0, K=0.
The correction components are CO and SO2 only.