12 heater on-time ratio, 13 oxygen concentration (with time constant), 14 maximum oxygen concentration – Yokogawa Integral Oxygen Analyzer ZR202 User Manual

Page 115: 15 minimum oxygen concentration, 16 average oxygen concentration, 17 span and zero correction ratios

Advertising
background image

<10. Other Functions>

10-6

IM 11M12A01-04E

10.1.12 Heater On-Time Ratio

The probe sensor is heated to and maintained at 750°C. When the sample gas temperature is high,

the amount of heater ON-time decreases.

10.1.13 Oxygen Concentration (with time constant)

When the output damping is specified in the mA-output range setting, the corresponding time constant

is also displayed.

10.1.14 Maximum Oxygen Concentration

The maximum oxygen concentration and the time of its occurrence during the period specified in the

Averaging display are displayed. If the setup period elapses, the maximum oxygen concentration that

has been displayed so far will be cleared and a new maximum oxygen concentration will be displayed.

If the setup period of time is changed, the current maximum oxygen concentration will be displayed

(for more details, see Section 8.7.2 earlier in this manual).

10.1.15 Minimum Oxygen Concentration

The minimum oxygen concentration and the time of its occurrence during the period specified in the

Averaging display are displayed. If the setup period elapses, the minimum oxygen concentration that

has been displayed so far will be cleared and a new minimum oxygen concentration will be displayed.

If the setup period of time is changed, the current minimum oxygen concentration will be displayed (for

more details, see Section 8.7.2 earlier in this manual).

10.1.16 Average Oxygen Concentration

The average oxygen concentration during the periods over which average values are calculated is

displayed. If the setup period elapses, the average oxygen concentration that has been displayed so

far will be cleared and a new average oxygen concentration will be displayed. If the setup period of

time is changed, the current average oxygen concentration will be displayed (for more details, see

Section 8.7.2 earlier in this manual).

10.1.17 Span and Zero Correction Ratios

Span and zero correction ratios for the past ten calibrations are recorded to enable you to check the

degradation of the sensor (cell). If the correction ratio is beyond the limits as shown in Figure 10.2, the

sensor should no longer be used.
These ratios can be found by calculating the data as shown below.

21.0

p1

0.51

81.92

ez

e1

es

0

C

A

B

Zero correction ratio = (B/A) x 100 (%) Correctable range: 100 ± 30%

Span correction ratio = (C/A) x 100 (%) Correctable range: 0 ± 18%

Cell

electromotive

force, mV

Calibration curve

before correction

Previous

zero gas data

Corrected calibration curve

(theoretical calibration curve)

Zero origin

Span origin

Span gas concentration

Oxygen concentration (vol%O

2

)

F10.2E.ai

Figure 10.2

Advertising