... apparatus: relay lag quantity any setting, relay load 10A 220VAC8.Working conditions: environmental temperature is 0 ~ 60°C, relative ... < 500Ω (0-10 ma), load < 750Ω (4-20mA)10.Working voltage: 220 VAC plus or minus 10%,50/60hz11.Feet ... water treatment, biological fermentation, breeding, medicine, Tap water, etc. High quality and cheap disslved oxygen controller for Water and wastewater treatment ...