The HT-20 is AMCI's most popular heavy duty ,single turn transduer. The HT-20 is IP67 rated and will survive most industrial including washdowns. The HT-20 is not recommended for corrosive environments. AMCI manufactures the HT-20K and HT-20L transducers with stainless steel shafts for these applications. TheHT-20C with stainless steel shaft and body is also available.
Because of the large shaft bearings used in the HT-20,gears or pulleys can be directly mounted onto the shaft. However, use a flexible coupler when attaching the transducer to a machine shaft. Even a small mis-alignment or movement in the machine shaft can cause very large radial and axial loads on the transducer bearing if the two shafts are directly coupled.
When face mounting the HT-20,the pilot hole for the shaft should be at least 1.19"in diameter so that the bearing can pass through the hole.
Because the HT-20 is an absolute sensor, it cannot "lose counts" as an incremental transducer can. If the HT-20 appears to be losing counts when operating, the usual cause is a shaft slipping in a loose coupler. Check all mechanical couplings and use shaft keys wherever possible.