Omega Products PHE-45P Installation Manual
Table of Contents
Part 1 Introduction
1.1 General 3
1.2 Sensor Features 3
1.3 Sensor Specifications 4
1.4 Important Notes 5
Part 2 Installation
2.1 General 6
2.2 Electrical 8
Part 3 Maintenance and Troubleshooting
3.1 Cleaning the Sensor 10
3.2 Replacing the Saltbridge 11
3.3 Troubleshooting 12
Diagrams and Illustrations
Figure 1-1 PHE-45P Sensor Dimensions 5
Figure 2-1
Monitor/Analyzer 6
Figure 2-2 PHE-45P Sensor Types 7
Figure 2-3
Figure 2-4
Figure 3-1 Replacing the Saltbridge and
Reference Buffer 11
Integral Mount to PHTX-45
Cable Description 8
Wiring Diagram, PHE-45P - PHTX-45 9
Rev. C, 05/03
PHE-45P
2
Part 1 - Introduction
1.1 General
1.2 Sensor Features
The Model PHE-45P pH Sensor measures the pH of
aqueous solutions in industrial and municipal process
applications. It is designed to perform in the harshest of
environments, including applications that poison conventional
pH sensors. All seals are dual o-ring using multiple sealing
materials. The sensor is designed for use with the Omega
PHTX-45 Monitor/Analyzer.
•
A high volume, dual junction saltbridge is utilized to
maximize the in-service lifetime of the sensor. The
annular junction provides a large surface area to minimize
the chance of fouling. Large electrolyte volume and dual
reference junctions minimize contamination of the
reference solution. The saltbridge is replaceable.
• The reference element of the sensor is a second glass
pH electrode immersed in a reference buffer solution.
This glass reference system greatly increases the
range of sensor applications.
• An integral preamplifier is encapsulated in the body of
the sensor. This creates a low impedance signal
output which ensures stable readings in noisy environments and increases the maximum possible distance
between sensor and transmitter to 3,000 feet (914
meters).
• System diagnostics warn the user in the event of
electrode breakage, loss of sensor seal integrity or
integral temperature element failure.
• Pt1000 RTD. The temperature element used in the
PHE-45P sensor is highly accurate and provides a
highly linear output.
Rev. C, 05/03
PHE-45P
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Part 1 - Introduction 1.3 Sensor Specifications
1.3 Sensor Specifications
PHE-45P
Measuring Range
Sensitivity
0.002 pH
0 to 14.00 pH
Stability 0.02 pH per 24 hours, non-cumulative
Wetted Materials PEEK, ceramic, titanium, glass, Viton, EDPM
(optional: 316 stainless steel with 316SS body)
Temperature Compensation Pt1000 RTD
Sensor Cable 6 Conductor (5 are used) plus 2 shields,
15 feet (4.6 meters) length standard
Temperature Range -5 to +95 °C (23 to 203 °F)
Pressure Range
Maximum Flow Rate
0 to 100 psig
10 feet (3 meters) per second
Max. Sensor-Analyzer
Distance
3,000 feet (914 meters)
Sensor Body Options 1” NPT convertible, 1¼” insertion, 1½” or 2” sanitary-style
Weight 1 lb. (0.45 kg)
Notes: 1. The type of hardware used to mount the sensor may limit the maximum temperature
and pressure ratings. Please consult the hardware manufacturer’s specifications
to obtain the relevant temperature and pressure rating information.
2. The maximum flow rate specification is lower for process solutions with low ionic
conductivity or high suspended solids concentration. High flow rates in low ionic
conductivity processes may cause a measurement error due to static electrical
discharge. High flow rates in processes with high suspended solids concentration
may decrease the functional life of the sensor by eroding the pH-sensitive glass
electrode.
Rev. C, 05/03
PHE-45P
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Part 1 - Introduction 1.3 Sensor Specifications
Inches (mm)
Figure 1-1 PHE-45P Sensor Dimensions (standard, convertible-style)
1.4 Important Notes
1. The PHE-45P process electrode is made of glass and
can break if not handled properly. Should the electrode
ever break, USE CAUTION when handling the sensor
to avoid serious cuts.
2. The glass electrode must be wetted at all times to
ensure proper functionality. PHE-45P sensors are
shipped with a fluid-filled cap over the electrode to
enable immediate use (remove cap before installing,
save for storage and shipping purposes). Electrodes
that have dried out for any reason should be hydrated
for 24 hours to restore full functionality.
3. Hydrofluoric acid (HF) will dissolve conventional glass
electrodes. Please contact the factory when the process
application involves this or any other questionable
substance.
Rev. C, 05/03
PHE-45P
5
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