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DCR-1006A Level Controller Rev. B2, 7/15 <br /> Stand Pipe Mounting <br /> Stand pipes are used to provide headroom at <br /> the top of a tank when the target is expected <br /> to come closer to the sensor than the <br /> minimum blanking distance. It's very critical <br /> that the stand pipe be installed perpendicular <br /> to the target. This is especially important <br /> on longer range applications. The pipe must <br /> have smooth walls (no joints) and no burs or <br /> obstructions. If possible, cut the end of the <br /> pipe at a 10°-45° angle (see drawing). Use <br /> the largest diameter pipe and shortest length <br /> possible. As a general rule, the diameter of I <br /> the pipe should be 1/2 the length. The pipe r rel Cut at angle <br /> ID must remain the same through it's entire t_ when possible <br /> length. <br /> Stilling Pipe Mounting n <br /> Stilling pipes provide access to difficult areas _vent Hole <br /> and help eliminate problems with foam. <br /> The pipe must have smooth walls (no burs <br /> or joints). Because the sound waves will <br /> concentrate and propagate down the inside <br /> walls of the tube, any irregularities on the <br /> tube walls may produce echo returns and <br /> cause false readings. Stilling pipes are limited <br /> to liquid targets that will not leave heavy <br /> deposits on the tube walls. Because the <br /> sound waves are confined inside the pipe, <br /> it is usually necessary to greatly reduce the <br /> sensors sensitivity and pulses settings. A vent <br /> hole must be provided at the top of the pipe. <br /> Be sure to keep the vent hole inside of the <br /> blanking area. <br /> APGO <br /> 8 <br />