AFS Foundry Sand Testing Equipment Operating Instructions Manual

RIDSDALE CALIBRATION EQUIPMENTTUBE TYPE PERMEABILITY STANDARDS(FOR ROUTINE CHECKING OF ELECTRIC PERMMETER)ITEST PROCEDURE(a)(b)Switch on blower motor of the Electric Permmeter by moving toggle switch to the“ON” position. Allow the motor to run for at least one minute in order to obtain astable reading on the gauge.Remove rubber stoppers from tube and select orifice for the standard to be tested, ie,●●for permeability standard marked LOW use orifice marked “S”.for permeability standard marked HIGH use orifice marked “L”.(c)(d)(e)(f)(g)(h)(i)Place the specimen tube containing the permeability standard uppermost over thecentre post of the Permmeter.Rotate the knurled ring of the centre post anti-clockwise to seal the specimen tube.Place the lever on the left hand side of the Permmeter body in the “CHECK”(forward) position.Adjust the motor speed control rheostat to obtain a pressure reading of exactly100 mm or “O” permeability on the pressure gauge.Move the lever to the “TEST” (rear) position, and read permeability from theappropriate scale according to the orifice in use.Return lever to its “CHECK” position and confirm that a pressure of 100 mm is stillrecorded.Release the specimen tube by rotating the knurled ring in a clockwise direction.114