Yokogawa Low Concentration (ppm) Zirconia Oxygen Analyzer OX400 - Manual (Page 39)

<6. Operation and Parameters>
6-2
IM 11M10B01-01E
6.1 Startup and Settings
Turning on the Power
Turn on the POWER switch on the front panel. After all displays turn on, the warm-up screen “HEAt”
appears, and the OX400 automatically enters the warm-up mode.
The remaining warm-up time is displayed and counted down from 20, and when the warm-up time
ends, the measurement screen appears automatically. The warm-up time is about 20 minutes.
The mA output is 4 mA during the warm-up time, and the voltage output is 0 V. Furthermore, it is
recommended to check and set the parameters during the warm-up time.
The following shows the operating procedure.
1. Set the parameters required for operation (in the maintenance mode).
2. Check and adjust the sample gas flow rate (200 ±25 ml/min, a floater should be between upper and
lower bar of the 200 ml/min bar on flowmeter)
3. Check the measured values (in the measurement mode), and perform calibration, if necessary (in
the maintenance mode).
6.1.1 Setting Output Range “rnG”
Operation: Hold down the [MODE] key for 2 seconds, select “rnG” with the [▲], [▼] keys, and
press the [ENT] key.
Roughly three types of measurement range are available, “Auto Range,” “MANUAL Range,” and
“Partial Range.”
1) Auto Range “AUto” (auto range)
With respect to this range, the range is switched automatically depending on the oxygen
concentration value. Enter range code “1” (default) if the full scale is always 10 x 10 n , as in the
case of 0 to 10 ppm, 0 to 100 ppm, 0 to 1000 ppm, 0 to 10%, 0 to 100%. Furthermore, enter
range code () “2” to “9”, as in the case of 0 to 0 ppm, 0 to 00 ppm, 0 to 000 ppm, 0 to

0%. For example, enter range code “2” if 20 x 10 n applies, as in the case of 0 to 20 ppm, 0 to
200 ppm, 0 to 2000 ppm, 0 to 2%, 0 to 20%.
2) MANUAL
Range “MAn” (fixed range)
This range is a fixed range. Select one from the following six ranges: 0 to 10 ppm, 0 to 100
ppm, 0 to 1000 ppm, 0 to 1%, 0 to 10%, and 0 to 100%. The range is always the same and is
independent from the oxygen concentration.
3) Partial Range “FrEE”–“Fr.HI” –“Fr.Lo” (free range)
With respect to this range, any range can be set and fixed. However, the smallest span of the
range must be more than 20%FS of the above MANUAL range.
Examples: 2 to 4 ppm if the MANUAL range is 0 to 10 ppm
60 to 80 ppm if the MANUAL range is 0 to 100 ppm
NOTE: Flashing italic characters such as “1.000” used in the subsequent operation flow charts mean
waiting for key input. Furthermore, the larger box means the main display (large digital display)
on the front panel and the smaller box means the sub-display (small digital display).
AUto
rnG
Main display
MODE LED
The MODE LED
turns on in the
maintenance mode.
The event of an error causes the LED to turn on.
The event of an alarm causes the LED to flash.
Sub-display
ERR/ALM LED
The respective unit turns on.
%
PPM
Unit LED
MODE
ERR/ALM
Operation in the maintenance mode
Press the key to return to the previous operation.
Hold down the key for 2 seconds to return to
the measurement mode.
You may need to enter a numerical value, decimal point,
and unit during the operation.
The following operation flow charts may omit this operation.
For details of the numerical value, decimal point, and unit operation,
see Section 6.6.
MODE
MODE