Datasheet: General Purpose pH/ORP Sensor Model 3900/3900VPSource: Emerson Process Management, Rosemount Analytical
General purpose pH/ORP sensor model 3900/3900VP. The double junction reference aids in the sensor's resistance to harsh environments and helps prolong sensor life. Models 3900 and 3900VP are provided with a double junction reference, which protects the reference element from poisoning ions — such as ammonia, chlorine, cyanides, and sulfides — in the process. Both models are made with porous Teflon® junction positioned near the pH/ORP-sensitive membrane.