![How does it work? (Very well!!)
The basic potentiometric measurement
principle remains the same; the millivolt
reading from the pH glass electrode is
compared to a reference electrode. In the
case of the InPro 4850i, the reference
electrode is not the traditional Ag/AgCl
electrode, but rather a sodium-ion glass
electrode. Similar to pH glass, the sodium
reference millivolt output is proportional to
"pNa" (-log [Na+]). In chlor-alkali applications
with constant background sodium
concentrations, this approach provides a
stable, reliable reference millivolt reading.
Application Notes:
• The InPro 4850i electrode design is specific
to the chlor-alkali industry in applications
where the sodium concentrations remain
constant.
• The calibration of the electrode requires
use of special pH buffers with a fixed
(3.9M) NaCl background. (Offered below.)
Important Housing Notes:
• Attention: Due to the electrode tip construction, the sensor is 5 mm longer than
traditional pH sensors, which needs to be considered in housing selection. It does not
fit into all standard housings.
• InFit 761, 762, and 763 can be used with the sensor extending an additional 5 mm into
the process
• A special version of the InTrac 787 will be available; call for quote.
• InTrac 775 is in development. (This is the new InTrac 77X for the InPro 4850i.)
• A 430 mm length for use with the InTrac 785 is under future consideration
Transmitter Notes:
• The transmitter firmware must be compatible for use with the InPro 4850i. Please refer
to table and timing below.
• Note that the M420 will not measure ORP. All other transmitters listed can measure
ORP.](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
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In pro 4850i brochure
- 1. Marketing Bulletin No. 008_2011 September 20, 2011 Webex Seminars: If you have Chlor-alkali industry in your territory, you should attend! th Monday : September 26 , 9AM and 11AM th Friday: September 30 , 10AM and 3PM InPro 4850i: New pH Technology for Chlor-Alkali Industry Dear Colleague, Mettler-Toledo Ingold is pleased to announce the release of the InPro 4850i sensor, a unique ISM pH/ORP electrode featuring a sodium-ion reference electrode. This sensor is specifically designed and targeted to the aggressive Chlor- Alkali applications. High salt background and chlorine cause drift and maintenance issues with conventional pH electrodes. The design of the InPro 4850i eliminates the porous reference junction and the associated problems of plugging and electrolyte poisoning that lead to measurement drift. All this plus ISM! This low maintenance electrode will be a great fit for the typical 15-20 measurement points within a facility. Key Features: • Dual-membrane "pNa" reference system - Long lifetime, hermetically sealed, high accuracy and low maintenance thanks to sodium reference and absence of reference diaphragm • Solution ground and shielding - Stabilize the signal and enable redox (ORP) measurement • Digital signal - 100% signal integrity. Immunity to electrical interference and signal distortion ensures stable and accurate data • ISM technology - ISM provides Plug and Measure installation, and predictive maintenance from sensor self-diagnostics.
- 2. How does it work? (Very well!!) The basic potentiometric measurement principle remains the same; the millivolt reading from the pH glass electrode is compared to a reference electrode. In the case of the InPro 4850i, the reference electrode is not the traditional Ag/AgCl electrode, but rather a sodium-ion glass electrode. Similar to pH glass, the sodium reference millivolt output is proportional to "pNa" (-log [Na+]). In chlor-alkali applications with constant background sodium concentrations, this approach provides a stable, reliable reference millivolt reading. Application Notes: • The InPro 4850i electrode design is specific to the chlor-alkali industry in applications where the sodium concentrations remain constant. • The calibration of the electrode requires use of special pH buffers with a fixed (3.9M) NaCl background. (Offered below.) Important Housing Notes: • Attention: Due to the electrode tip construction, the sensor is 5 mm longer than traditional pH sensors, which needs to be considered in housing selection. It does not fit into all standard housings. • InFit 761, 762, and 763 can be used with the sensor extending an additional 5 mm into the process • A special version of the InTrac 787 will be available; call for quote. • InTrac 775 is in development. (This is the new InTrac 77X for the InPro 4850i.) • A 430 mm length for use with the InTrac 785 is under future consideration Transmitter Notes: • The transmitter firmware must be compatible for use with the InPro 4850i. Please refer to table and timing below. • Note that the M420 will not measure ORP. All other transmitters listed can measure ORP.