ISOLOK automatic samplers from Sentry Equipment effectively sample sludge from a pressurized line, capturing fixed sample volume at fixed time intervals for uniformity and consistency. An isolation valve, ISOVALVE, allows the samplers to be removed for inspection or servicing while process lines remain pressurized. The sampler is designed to be safe, clean, reliable and simple to use, increasing plant efficiency and greatly decreasing labor costs. 262/567-7256; www.sentry-equip.com.