Rosemount Model 389 pH/ORP Sensor

Name: Rosemount Model 389 pH/ORP Sensor
Price: 806.91 USD
Availability: InStock

Insertion pH/ORP sensors with optional integral preamp.

Starting at $806.91

This probe currently has an exceptionally long lead time. If you would like to consider an alternative option, please call Instrumart to discuss your application.

Effective April 15th, 2025 Rosemount has added a 6.4% surcharge for all of their products. The surcharge will appear as a separate line item on the order.

View Company Reviews

Manufactured

By Rosemount

Includes

FREE Ground Shipping on orders of $1,000 or more
FREE Lifetime Tech Support

Availability

Some models in stock. View available part numbers.

Product Manual Product Specs

Features

Wetted Materials: Tefzel, Viton, glass, ceramic
pH Glass Types: Hemi bulb and High pH glass
Insertion Depth: 2.8 in. to 5.5 in. (6.1 cm to 14 cm)
Sensor Design: Threaded connection for in-line or submersion mounting
Electrical Connection: Integral cable or VP connector
Temperature Compensation: 3K or Pt 100
Process Connection: 1 inch MNPT threads in two places
Triple junction reference

The Rosemount Models 389 and 389VP are insertion style pH/ORP sensors with integral preamp. These sensors are compatible with nearly all Rosemount pH/ORP analyzers. Both models are combination sensors (pH, reference, and temperature within sensor body) and measure pH or ORP (Oxidation/Reduction Potential) of aqueous solutions in pipelines, open tanks, or ponds. Models 389 and 389VP are suitable for virtually all applications and are compatible with Rosemount Analytical and other manufacturers' instruments.

The Rosemount Models 389 and 389VP are housed in a molded Tefzel body with Viton o-rings, making each sensor virtually indestructible and chemically resistant. The simplified construction, designed with user convenience in mind does not require electrolyte replenishment or any high maintenance troubleshooting procedures. The 389 features an integral cable design while the 389VP is offered with a watertight Variopol VP multiple pin sensor-to-cable connector which eliminates re-wiring and cable twisting when replacing sensors. Installation is easily achieved through the wide variety of mounting configurations. Both models feature 1 inch (MNPT) front and rear facing connections for insertion, submersion, or flow-through pH and ORP applications.

Both the 389 and 389VP are provided with a triple junction reference which protects the reference element from harsh elements and helps prolong the sensor life. Both the 389 and 389VP require a preamplifier to convert the high impedance pH signal into a stable, noise-free signal. The 389 offers the choice of an integral sensor preamplifier. Both models can use a remote preamplifier, integral to the analyzer/ transmitter or in a remote junction box. All preamplifiers have a transmission capability of up to three miles.

11-cond shielded extension cable.

Starting at $135.60

Accessories

Please consider these optional accessories.

Rosemount Electronic Calibration

Certificate for specific unit, includes model, serial and/or tag numbers, test standards, NIST report numbers, & the actual test data.

Starting at $235.84

Rosemount Certificate of Origin

Original certificate of origin with chamber of commerce stamp.

$394.87

Rosemount Sensor Material Certificate

$127.41

Rosemount Union PVC

Union PVC.

$177.11

This product can be used in the following applications:

Part Number	Electrode	Price	Available
389VP-10-54 Show Full Configuration	Low impedance general purpose pH electrode	$847.58	6 in stock
389-01-10-55 Show Full Configuration	Low impedance general purpose pH electrode	$984.92	1 in stock

Interested in Other Part Numbers?

Other part numbers are available to order but are not currently in stock. Current availability for non-stock parts is "Usually ships in 3-4 weeks". Click here to select options