YOKOGAWA RC400G, Руководство пользователя

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<4. Operation>
4-9
IM 12F4A1-01E
4.3.8 Confirming Cleaning Solenoid Valve Operation and
Adjusting Ball Valve Opening
There are performed only for the residual chlorine analyzer RC400G-2 or RC400G-3 for raw
water or treated water.
Perform solenoid valve operation confirmation and ball valve opening adjustment in the following
procedure:
(1) Adjust the flow rate of cleaning water entering the sand filter.
• First press [SV1] key and actuate solenoid valve SV1 (valve: open). Confirm that solenoid
valve SV1 has operated, though lighting of <SV1> lamp.
• Next, adjust the opening of ball valve V1 located under the sand filter. Open the valve to the
extent that the sand in the sand filter is not forced up above the sample water inlet.
• After adjusting the ball valve opening, again press [SV1] key to stop operation of solenoid
valve SV1.
If a residual chlorine analyzer for treated water is used, adjust also the flow of cleaning water
entering another sand filter.
• Press [SV5] key to operate solenoid valve SV5 (valve: open). Adjust ball valve V5 to the
extent that the sand in the sand filter is not forced up above the sample water inlet.
(2) Adjust the flow rate of cleaning water entering the measuring tank.
• First press [SV2] key to operate solenoid valve SV2 (valve: open). When solenoid valve
SV2 operates, <SV2> lamp is lit.
• Next, gradually open ball valve V2 to adjust the flow. Adjust it to the extent that glass beads
float in the measuring tank and that the water level does not exceed the second slit of the
bead case from its top.
• After adjusting cleaning water flow rate, press again [SV1], [SV2], and [SV5] keys to stop
operation of solenoid valves SV1, SV2, and SV5.
Operating times related to cleaning are already set on shipment. Since these sequential
operations become stopping states in <MAINT.> mode, set the mode in <MEAS.> mode for
sequence operation. However, even in <MAINT.> mode, cleaning operation can be manual-
started though operations at the function codes “4”, “5”, and “6” (see 5.3.3 (3)).
If setting times related to cleaning are to be changed, perform setting referring to subsection
5.3.5.
4.3.9 Purging Air Supplying
Halogen gases are strongly corrosive. To protect metallic parts from corrosion owing to intrusion
of halogen gases generated from sample water, purge the inside of enclosures such as the
electrode mechanism block with air.
If an air pump is attaches, press [AIRPUMP] key to operate this pump. If “on” has been selected
with the function code “d.” in <PROGRAM. 1> mode, setting <MEAS.> mode starts pump
operation without pressing the key for selecting the operation status.
CAUTION
If optionally specified for air pump addition, the analyzer is shipped from the factory with the
setting “on”.
If instrument air is to be used, supply it by regulating the pressure to 140 kPa.
Tightly close the cover of the enclosure to be air-purged.
14th Edition : Jul. 15, 2020