Rosemount™ 389/389VP General Purpose pH/ORP Sensors

Rosemount™ 389/389VP General Purpose pH/ORP Sensors

Dependable pH/ORP measurements to solve your process needs

Rosemount 389/Rosemount 389VP sensors are suitable for use in a wide variety of applications. Reliably measure pH or oxidation/reduction potential of aqueous solutions in pipelines, open tanks, and ponds. These sensors are ideal for use in process solutions containing poisoning ions.

Reliability meets robustness

■ A triple junction reference prolongs sensor life and protects against poisoning ions, such as ammonia, chlorine, cyanides, and sulfides.

■ Enhanced performance and increased life with cracking resistant glass.

■ Available with a glass electrode option for high pH applications.

■ Superior chemical resistance provided by a rugged Tefzel® body with Viton® O-rings.

Ease of installation

■ The molded sensor body features 1-in. (25,4 mm) MNPT front and rear facing process connections for insertion, submersion, and flow-through applications.

■ Variopol (VP8) cable connection option, for quick cable-to-sensor release, eliminates cable twisting (Rosemount™389VP).

Maintenance made simple

■ Automatic recognition of pH sensors by Rosemount transmitters: 56, 1056, 1057, and 1066 with integral SMART preamplifier.

■ pH calibration data is stored, which allows sensors to be calibrated in advance for "plug and play" installations in the field.

The Rosemount 389 and 389VP General Purpose pH/ORP Sensors are housed in a molded Tefzel® body with 1-in. (25,4 mm) MNPT forward and rear facing threads suitable for insertion, submersion, or flow through installation.

The sensors can be configured with a general purpose pH, high pH, or platinum ORP electrode. Emerson offers the sensors with SMART preamplifiers for pH measurements and standard integral parameters for ORP measurements. These sensors may be configured without a preamplifier, but must be used with a remote preamplifier (junction box or transmitter). Automatic temperature compensation is standard. The sensors are available with either an integral cable connection (Rosemount 389) or Varipol (VP8) connector (Rosemount 389VP).

Table 1: Rosemount 389 Ordering Information

Option Description

389 pH/ORP sensor

Preamplifier cable

01 Integral preamplifier, 25-ft. (7,6 m) cable

02 No preamplifier, 15-ft. (4,6 m) cable

03 Integral preamplifier, 33-ft. (10 m) cable