The Rosemount 3900 pH/ORP combination sensor’s double junction reference aids in the sensor’s resistance to harsh environments and helps prolong sensor life.
The double junction protects the reference element from poisoning ions-such as ammonia, chlorine, cyanides, and sulfides. Both sensors are made with a porous Teflon® junction. The robust sensor design makes the 3900 reliable in a wide range of aqueous solutions found in pipelines, open tanks or ponds.
Maximum Pressure: 790 kPa [abs] (100 psig) at 100°C (212°F)
Materials of Construction
Stainless steel, glass, Teflon®, polyphenylene sulfide (PPS), EPDM and silicone
Integral Cable: 32 ft (10m) cable with integral SMART preamp; 15 ft (4.7m) cable without preamp sensor
VP8 Cable: use 24281-XX, 2.5 ft (.8m) to 100 ft (31m)
Front facing: 3⁄4″ and 1″ MNPT; Rear facing: 1″ MNPT
Extended sensor life and protection against poisoning ions using a double junction reference
Enhanced performance and increased life with cracking resistant glass
Maximum chemical resistance provided by a rugged polyphenylene sulfide body
Operates in sub-zero temperatures down to -10°C (14°F)
Built-in solution ground for advanced diagnostics
The sensor body features a one-piece construction with both front facing and rear facing process threads
¾” and 1” MNPT process connections to meet a variety of application installation requirements