4 setting purging – Yokogawa Single Channel Oxygen Analyzer System ZR22/ZR402 User Manual

Page 134

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IM 11M12A01-03E

8-22

8.6.3.2Setting Measurement Gas Pressure

To set the measurement gas pressure, follow these steps:

(1) Call up the Exhaust gas setup display and choose Pressure.
(2) Enter the measurement gas pressure (absolute pressure) from the numeric data

entry display.

8.6.3.3Default Values

When the analyzer is delivered, or if data are initialized, measurement gas temperature
and pressure set ranges and their default settings are as shown in Table 8.9.

Table 8.9 Measurement Gas Temperature and Pressure Set Ranges and Default Settings

Set Item

Set range

Default setting

Temperature input selection

Preset value

Measurement gas temperature

0 to 3000

ЊC

300

ЊC

Temperature at 4 mA

0 to 3000

ЊC

0

ЊC

Temperature at 20 mA

0 to 3000

ЊC

1000

ЊC

Absolute humidity of the atmosphere

0 to 689.47 kPa abs

101.33 kPa abs

T8.9E.EPS

8.6.4

Setting Purging

Purging is to remove condensed water in the calibration gas pipe by supplying a span
calibration gas for a given length of time before warm-up of the detector. This prevents
cell breakage during calibration due to condensed water in the pipe.

The solenoid valve for the automatic calibration span gas is opened during purging and
after the purge time has elapsed, the valve is closed to start warm-up.

Purging is enabled when the cell temperature is 100

ЊC or below upon power up and the

purge time is set in the range of 1 to 60 minutes.

Tag:

30

Њ

C

4mA -Output1
4mA -Output2

Hold

Purge

F20.EPS

Figure 8.20 Display during Purging

8.6.4.1Procedure

Set the purging time as follows:

(1) Press the Setup key in the basic panel display to display the Execution/Setup display.

(2) Select Setup in the Execution/Setup display. The “Commissioning” (Setup) display
then appears.

(3) Select Others in that display and the Others display then appears, as shown in Figure
8.21.

(4) Select Purging. The Purging time setting display appears, as shown in Figure 8.22.

(5) Point to the Purging time and press the [Enter] key. Then the display for selecting
purging time appears.

(6) Enter the desired numeric value from the numeric-data entry display.

The allowable input ranges from 0 to 60 minutes.

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