JMT - 104
AUTOMATIC STANDARD PENETROMETER IS :310,1203,1448, IP : 60, 49, 50, ASTM : D5, D217, D637
Used to determine grade of bitumen. The penetration tests determine consistency of bitumen for the purpose of grading. Depth is units 1/10 of millimeter to which a standard needle having a standard weight will penetrate vertically in a duration of five seconds at a temperature of 25oC determines penetration of gradation.
It consists of a vertical pillar mounted on a base provided with leveling screws. The head, together with dial plunger rod and cone (or needle) slides on a pillar and can be clamped at any desired height. A rack and pinion and pointer assemble provides fine adjustment of needle or cone tip to sample. It incorporates a clutch mechanism which makes reading of penetration and subsequent resetting a simple and accurate operation. The dial is graduated in 400 1/10 and the millimeter subdivision and the needle pointer against figures makes easy reading. Supplied with a bitumen penetration needle, ring weight one each 50 gms, and two sample containers.
Penetration cone for empirical estimation of penetration of lubricating grease, petroleum jelly etc.
It is supplied with transistorized timer and electro-magnet incorporated in the clutch mechanism to accurately control penetration time to exact five five seconds