Sensorex SD7000 Series Product Instruction Sheet

SD7000 Series Differential
pH/ORP Electrode Instructions

Introduction

Congratulations on your purchase of your Sensorex SD7000
Series pH or ORP true differential electrode. Please follow
instructions and tips to get the maximum life out of your
electrode.

Electrode Care and Use Tips

1. The SD7000 Series pH and ORP electrodes are shipped with a
cap containing a solution of pH 4 buffer and potassium
chloride.
The cap should remain on the electrode until it is used. If the
electrode is used infrequently the cap and its solution should
be saved and the electrode stored in it. Store pH and ORP
electrodes in pH 4 buffer if soaking solution is discarded.
Before using the electrode remove the soaker cap as shown
in FIG 1.
2. Sensorex true differential electrodes have a 2 year prorated
warranty from the date etched in the electrode body as shown
in FIG 2. Electrodes in inventory should be rotated so that the
older electrodes are used first. The date code is stamped on
each electrode by fiscal week and year (Example: 4613 = week 2
of November 2013).
3. After exposure to a sample, buffer or rinse solution, carryover
can be minimized by blotting—never by wiping—the elec-
trode with a clean non-abrasive paper or a clean cloth towel.
Do not use a brush on pH glass.
4. As a rinse solution, measure and use a portion of the next
sample or buffer. This action will minimize carryover
contamination.
5. When calibrating pH electrodes, use a buffer close in value to
that expected from the sample for one-point calibrations or as
the second buffer for two-point calibrations (See below). This
action will minimize span errors. ORP electrodes are typically
not calibrated. However, a solution to verify electrode perfor-
mance should be used periodically. 225mV solution, Zobell's
solution (Part no. B225), is a good choice for single point
verification.
Parts covered by this product data sheet include:
SD7000CD, SD7000CD-ORP, SD7500CD, SD7500CD-ORP, SD7420CD, SD7420CD-ORP
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PRODUCT INSTRUCTION SHEET
FIG. 1
FIG. 2
Form: InstrSD7000-05 [Rev: 2016-08-15]
©2016 Sensorex Corporation