Rosemount RBI pH Sensors

Threaded in-line, submerged or ball-valve insertion pH sensor, 0 to 14 pH measuring range.

Rosemount RBI-547 pH Sensor
Rosemount RBI-546 pH Sensor

Starting at $1,045.47

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.

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Manufactured

By Rosemount

Includes

FREE Ground Shipping
FREE Lifetime Tech Support

Availability

Usually ships in 8-12 weeks

Product Manual Product Specs

Features

0 to 14 pH measuring range
Chemically resistant KYNAR
Rugged, quick change, quick clean
Max temp: 266°F/130°C at 40 psig/276 KPa
Max pressure: : 150 psig/1035 KPa at 158°F/70°C
Model RBI-546:
- 3/4in MPT threaded nose
- Submerged; 3/4in MNPT threaded top
Model RBI-547:
- 1in MPT process fitting or, 1¼ and 1½in ball valve assemblies
- 1in MNPT process fitting, into 1in FNPT coupling or ¾in submersion extension pipe

The Rosemount RBI pH Sensor is designed for extended sensor life when used in applications with sulfides which are typically found in scrubbers. The Model RB is made with chemically resistant KYNAR. Optional installation methods allows standardization of entire plant with a minimum of sensor part numbers.

The sensor is built with a Kynar body and is designed in two configurations. The 546 sensor is housed in a fully encapsulated body for use in pipe tees or submersed in a tank. The 547 is the ball valve retractable version; the sensor body can be replaced and the titanium sensor sheath assembly (sold separately) can be reused. Both sensor types are built with a high performance J glass, notched tip with a Teflon junction, and a PT100 RTD. The integral cable is prepared with tinned leads for easy wiring.

Spec Sheets

Rosemount RBI pH Sensors Datasheet (2.4 MB)

Manuals

Rosemount RBI pH Sensors Manual (3.7 MB)

Required Components

These additional components are required for the operation of your product. We strongly advise you to purchase these components unless you already own them or own a suitable alternative.

Rosemount 23166 Connector

1 x 1in with o-ring groove, in 316 SS or titanium.

Some Models in Stock

Starting at $441.86

Cables

Rosemount 23646-01 Extension Cable

11-cond shielded extension cable.

Starting at $135.60

Rosemount 11-conductor Extension Cable

Shielded 11-conductor.

Starting at $135.60

Solutions

Rosemount pH Buffer Solutions

pH buffers for the precision calibration of pH meters.

Starting at $96.69

Accessories

Please consider these optional accessories.

Rosemount O-ring / EPDM

Quantity of 4, 2-214, EPDM, includes lube.

$160.84

Rosemount 9550220 O ring

2-214, Kalrez, for Process Connector.

$799.69

Rosemount 23555-00 Junction Box

Compatible with models 54, 5081, 1055 & Xmt preamplifiers.

$1,294.86

Rosemount Junction Box Sensor Head

Includes preamplifier, for 54 & 3081.

$1,551.48

Rosemount Ball Valve Assembly

1.5in, 316 stainless steel, process connector required.

$1,640.03

Rosemount 1 1/4" Ball Valve Assembly

$1,883.10

Rosemount BNC Adapter

BNC Adapter for Model 396P and 396PVP.

$101.20

Rosemount 99CC Calibration Certificate

One certificate per lot at standard factory ranges only, includes the model, serial and/or tag numbers (does not include actual test data).

$51.51

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

This product can be used in the following applications:

Here's how some of our customers use this product...

Monitoring the pH of a Wet Scrubber

The Background: Our customer is an industrial facility who’s process creates nitrogen oxide as a byproduct. Nitrogen oxide is a powerful pollutant that needs to be removed from the plant’s emissions before they are released to the atmosphere. It is removed using a wet scrubber. The customer needs an effective means of monitoring the pH of the wet scrubber to ensure the proper concentration of the chemicals used to remove the nitrogen oxide.

The Problem: The wet scrubber uses sodium hydroxide and sodium hydrosulfide to remove the nitrogen oxide. Both of these compounds are powerful alkalis meaning the pH can be as high as 12. A pH that high cannot be accurately measured with many pH electrodes. The pH is also high enough to damage electrodes.

The Solution: We recommended the Rosemount Analytical RBI pH Sensor which is designed for challenging environments. The RBI has a measuring range up to 14 pH and has a chemically resistant KYNAR body. The RBI includes has 5 junctions to resist poisoning extend sensor life.