Thermo Scientific 9156APWP, 9104APWP, 9107APMD, 9115APWP, 9135APWP Instruction Manual

User Guide

AquaPro and
Double Junction
pH Electrodes

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This publication supersedes all previous publications on this subject.

Introduction

This user guide contains information on the preparation,
operation and maintenance of the Thermo Scientific Orion
AquaPro and double junction pH electrodes.

AquaPro Professional pH Electrodes

All AquaPro pH electrodes feature a patented double junction
reference design and are mercur y-free. These electrodes use
an isolated Ag/AgCl internal reference and a polymer external
reference with an open junction for fast, accurate readings
in complex sample matrices without the sample coming in
contact with silver ions. The AquaPro electrodes are easy to
use and require minimal electrode preparation due to the low
maintenance polymer gel reference.

Double Junction pH Electrodes

Double junction pH electrodes are for general purpose samples
and feature an isolated Ag/AgCl internal reference and an
external reference that is either refillable or gel-filled. These
electrodes offer a mercury-free alternative to hazardous calomel
pH electrodes.

KNIpHE® Double Junction pH Electrodes

The KNIpHE double junction pH electrode is designed for meat,
cheese and other solid or semi-solid food samples. The pH
electrode is surrounded by a stainless steel blade that protects
the electrode and cuts through solid or tough materials. This
electrode is mercury-free and environmentally safe.

1AquaPro and Double Junction pH Electrode User Guide

Cat. No. Description

9102AP AquaPro combination pH electrode with

glass body and BNC connector

9103APWP AquaPro combination pH electrode with

glass body, semi-micro tip, and waterproof
BNC connector

9104APWP AquaPro combination pH electrode with

glass body, rugged bulb, and waterproof
BNC connector

9107APMD AquaPro pH/ATC Triode with epoxy body

and waterproof BNC and 8 pin MiniDIN
connectors

9115APWP AquaPro combination pH electrode with

epoxy body, semi-micro tip, and waterproof
BNC connector

9135APWP AquaPro combination pH electrode with

epoxy body, flat surface tip, and waterproof
BNC connector

9156APWP AquaPro combination pH electrode with

epoxy body and waterproof BNC connector

9102DJWP

9110DJWP Double junction refillable combination pH

9156DJWP Double junction gel-filled combination pH

9120APWP KNIpHE double junction refillable

Double junction refillable combination pH
electrode with glass body and waterproof
BNC connector

electrode with glass body, semi-micro tip,
and waterproof BNC connector

electrode with epoxy body and waterproof
BNC connector

combination pH electrode with stainless
steel cutting blade and waterproof BNC
connector

• All electrodes with a waterproof BNC and BNC connector
have one meter cable lengths.

• Electrodes with a waterproof BNC connector can be used
on any pH meter with a BNC connection.

2 AquaPro and Double Junction pH Electrode User Guide

Required Equipment

1. Thermo Scientific Orion pH meter, such as the 3-Star pH
meter, 4-Star pH/ISE meter, 4-Star pH/DO meter, 4-Star pH/
conductivity meter or 5-Star pH/ISE/DO/conductivity meter.

AquaPro and double junction pH electrodes can be used

on any pH meter with a BNC connection. The electrodes
can also be used on meters with a variety of inputs when
an adapter cable is used. Visit www.thermo.com/water for
details.

The AquaPro Triode has a temperature connector that is

compatible with specific meters, refer to the list below.

2. Thermo Scientific Orion AquaPro or double junction pH
electrode.

• The 9107APMD pH/ATC Triode has a temperature

connector that is compatible with the Star Series
pH meters.

3. Electrode filling solution (for 9102DJWP, 9110DJWP and
9120APWP electrodes only), Cat. No. 910008.

4. pH electrode storage solution, Cat. No. 910001.

5. pH buffers, at least two pH buffers are recommended for
precise measurements. One buffer should be near pH 7
and buffers should be one to three pH units apart.

6. Beakers, plastic or glass.

7. Magnetic stirrer or Orion stirrer probe, Cat. No. 096019.
The stirrer probe can be used with 3-Star, 4-Star and 5-Star
benchtop meters.

8. Distilled or deionized water.

3AquaPro and Double Junction pH Electrode User Guide

Electrode Preparation

1. AquaPro electrodes ship in a storage bottle that contains
storage solution. Remove the electrode from the storage
bottle and save the storage bottle for later storage. Refer to
the figure below.

For double junction electrodes, carefully remove the

protective shipping cap from the sensing element and save
the cap for storage.

2. Clean any salt deposits from the exterior of the electrode by
rinsing with distilled water.

3. If using a refillable electrode, uncover the filling hole by
removing the tape and then add electrode filling solution,
Cat. No. 910008, to the electrode. To maintain an adequate
flow rate, the level of filling solution must always be above
the reference junction and at least one inch above the
sample level. The filling hole should be open whenever the
electrode is in use.

4. Soak electrode in pH electrode storage solution, Cat. No.
910001, for 30 to 60 minutes.

5. Connect the electrode to the meter.

4 AquaPro and Double Junction pH Electrode User Guide