For pumping and feeding a slurry sample to a On-Stream-Analyzer (OSA), the classic pump to use is a vertical tank pump. The market for such OSA sample pump appears dominated by Metso. Irony is OSA’s are made by Outotec or Thermo Fisher Scientific, but you must go elsewhere to pump your slurry sample to the X-ray. What size should the OSA sample flow be?

Metso Sala Vertical Tank Slurry Pump, Model VF50 O5, complete with high chrome wear parts (casing, impeller, inlet), mild steel tank, steel shaft with no Shaft seal (no gland water required), 5 HP, 380 V, 60 Hz, 3-phase premium efficiency motor, motor plate, v-belt drive and belt guard.

This pump will suit all 3 duties you described of 150 lpm @ 30% solids, solids s.g=3.0 at 30 ft static head, and line lengths of 50 ft, 100 ft, 200 ft. The 5 HP motor is the smallest motor mounted on Metso pumps.