DIFFERENTIAL
pH AND ORP
SENSORS
Dierential Electrode Measurement
Technique
This field-proven technique uses three electrodes instead of
the two normally used in conventional pH sensors. Process
and reference electrodes measure the pH dierentially with
respect to a third ground electrode. The end result is
unsurpassed measurement accuracy, reduced reference
junction potential, and elimination of sensor ground loops.
These sensors provide greater reliability, resulting in less
downtime and maintenance.
Patented Technology
The former GLI, now a Hach Company brand, invented
the Dierential Electrode Technique for pH measurement
in 1970. The pHD™ sensor series (U.S. Patent Number
6395158B1, May 28, 2002) takes this field-proven
technology to a new level.
Replaceable Salt Bridge/Protector
The unique, replaceable salt bridge holds an extraordinary
volume of buer to extend the working life of the sensor by
protecting the reference electrode from harsh process
conditions.
Built-in Encapsulated Preamp
Encapsulated construction protects the sensor’s built-in
preamp from moisture and humidity, ensuring reliable sensor
operation. The preamp in the pHD analog sensor produces a
strong signal, enabling the sensor to be located up to 1000 m
(3280 ft.) from the analyzer.
Durable Body Materials
Both the digital and analog pH and ORP dierential sensors
feature a durable PEEK
®
body for chemical compatibility with
most process solutions. For less aggressive solutions, Hach
oers a Ryton
®
sensor in a convertible style for pH and ORP
measurement. A sensor with a stainless steel body is available
for immersion applications.
Versatile Mounting Styles
Sensors are available in four mounting styles—convertible,
insertion, immersion, and sanitary.
Dierential Sensor Warranty
Hach Company oers an outstanding warranty on its
dierential sensors. We will replace any dierential sensor
that fails due to defects in materials or workmanship within
one year from the date of shipment, and up to 30 months
on a prorated basis for any failure.
The smart choice for accurate, reliable, and
dependable pH/ORP measurement.
Hach Digital pHD sc sensors are available in convertible (PEEK
®
or Ryton
®
), insertion, and sanitary
body styles. Three electrodes are used in these sensors to increase measurement accuracy and
eliminate sensor ground loops.
Applications
• Drinking Water
• Wastewater
• Industrial Water
• Power
Wide range pH glass
(HF resistant glass also available)
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