Ph Probe Life; Ph Probe Calibration; Frequency; Procedure - Teledyne TIENet 301 Installation And Operation Manual

TIENet® 301 pH/Temperature Device
Section 2 Installation and Setup for Signature

2.3 pH Probe Life

2.4 pH Probe Calibration

2.4.1 Frequency

2.4.2 Procedure

2-10
pH probes are consumable items, meaning that they will even-
tually have to be replaced.
During the life of the probe you will have to clean and recalibrate
it periodically (For calibration instructions, refer to the next
section). Grease and debris will interfere with the probe's ability
to accurately measure pH. Because grease is an insulator, it will
keep the ions from reaching the glass membrane and porous
liquid junction, thus hindering the creation of a voltage potential
and slowing or stopping response time.
An indication that the probe is nearing the end of its service life
is an increasing time period to stabilize during calibration. This
can present a problem in applications with a rapidly changing
pH. Consider replacing the probe when delays become apparent.
The Signature flow meter provides a calibration procedure for
the pH probes using commercially prepared buffer solutions.
For accurate readings, you must clean and re-calibrate the probe
on a regular basis. Calibration intervals typically range from
weekly to monthly, depending on the application.
Note
For pH probe calibration, Teledyne ISCO recommends that you
use a glass container for the buffer solutions, and ensure that
the following conditions are met:
The probe must be properly submerged in solution, and there
must be no air trapped under the probe membrane, or the
reading may become incorrect and/or erratic.
Rinse the probe. From the Home screen, press the MENU softkey
and then follow the sequence shown in Figure 2-10. When the
sequence is completed, the buffer list will reappear. Rinse the
probe and select the next buffer calibration point or Done. Mea-
surement will resume after five minutes.