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When blow pipes are provided (See Fig. 5-8. in “Chapter 5 : Installation”)
(1) Close the stop valve on the high pressure side of the manifold valve.
(2) Close the stop valve on the low pressure side of the manifold valve.
(3) Slowly open the blow valves on both high and low pressure sides to drain out sediment or
any other entrapped substances.
(4) Close the blow valves on both the high and low pressure sides.
(5) Open the stop valve on the low pressure side of the manifold valve.
(6) Open the stop valve on the high pressure side of the manifold valve.
Blow of model 61/62 liquid level meter
(1) For an open tank liquid level meter, drain out liquid by loosening the drain plug at the
bottom of the low pressure side cover at appropriate intervals.
(2) For a closed tank liquid level meter of gas sealed type, first close the stop valve of the
low pressure side tapping-pipe and then open its blow valve to purge gas at appropriate
intervals.
(3) For a closed tank liquid level meter of liquid sealed type, check the seal liquid level and
replace seal liquid at appropriate intervals.
To replace seal liquid, proceed as follows: Close the stop valve on the low pressure side
tapping-pipe, open the blow valve, and loosen the drain plug to drain out the seal liquid.
Next, tighten the drain plug and feed seal liquid from the valve for blow until seal liquid
overflows from the blow valve, then close the blow valve, and lastly open the stop valve.
7-2-2. Cleaning of meter body
After the blowing of the piping as described in "7-2-1: Blow procedure" on page 7-1 has been
completed, clean the meter body as described below. For models 71/72 and 61/62, clean only
the diaphragms outsides of flanges.
(1) Remove the covers of the meter body by removing their clamping-bolts.
(2) Clean the diaphragm and the insides of the covers using a soft brush and detergent. When
doing this, be extremely careful not to deform or damage the diaphragm.
(3) When reassembling the covers, replace the gaskets with new ones as required.
