Yokogawa Multi Channel Oxygen Analyzer System ZR22/AV550G - Manual (Page 187)

IM 11M12D01-01E 10-25
10. Other Functions
10.6 Purging
At the beginning of calibration, condensation that has developed in the calibration gas
piping may be blown onto the sensor, causing sudden cooling and damage to the sensor.
Purging involves passing span calibration gas through the piping for a preset time before
warmup, in order to remove any such condensation. If the cell temperature is 100
ЊC or
greater, then purging cannot be performed. While purging is being performed, a [Purge]
status mark is displayed on the basic panel display, as shown in Fig. 10.31. Purging is
performed in sequence, starting with the smallest channel number. The timing of purging
is shown in Fig. 10.29.
F10.29E.eps
Power ON
Ch1 detector
Ch2 detector
Ch3 detector
Ch4 detector
Purging Warmup Measurement mode
Waiting Purging Warmup Measurement mode
Waiting Purging Warmup Measurement mode
Waiting Purging Warmup
Measurement
mode
Fig. 10.29 Purging Timing
CAUTION
1) When using hot swap functions to start a single specific channel, purging for that
channel alone is performed (there is no effect on other channels).
2) While any such specific individual channel is being purged, then manual or semi-auto
calibration or indication check cannot be started (for any channel).
3) While any such specific individual channel is being purged, then auto calibration,
auto indication check or auto blowback (for any channel) will wait until it ends.
4) Purging requires the same piping and wiring as calibration and indication check.