pH Sensors
Some industrial applications require accurate measurement and
control below 2 or above 12 pH. In these special cases, please
contact Hach Technical Support for further details.
Measuring Range -2 to 14 pH
Sensitivity ±0.01 pH
Stability 0.03 pH per 24 hours,
non-cumulative
Operating Temperature Digital Sensor: -5 to 70ºC
(23 to 158ºF)
Analog Sensor with Digital Gateway:
5 to 105ºC (23 to 221ºF)
Immersion Sensor: 0 to 50ºC
(32 to 122ºF)
Flow Rate 3 m (10 ft.) per second, maximum
Sensor Pressure/ Digital: 6.9 bar at 70ºC
Temperature Limits (100 psi at 158ºF)
Analog: 6.9 bar at 105ºC
(100 psi at 221ºF)
Built-in Temperature NTC 300 ohm thermistor for
Element automatic temperature compensation
and analyzer temperature readout
Transmission Distance 100 m (328 ft.), maximum
1000 m (3280 ft.), maximum when
used with a termination box
Sensor Cable (integral) 4 conductor cable with one shield
and polyurethane jacket; rated to
105ºC (221ºF); 10 m (33 ft.) standard
length
Wetted Materials PEEK
®
or Ryton
®
(PVDF), salt bridge
of matching material with Kynar
®
junction, glass process electrode,
titanium ground electrode, and
Viton
®
O-ring seals
(Please contact Hach Technical
Support for available wetted
O-ring materials.)
ORP (Redox) Sensors
For best ORP measuring results in solutions containing zinc,
cyanide, cadmium or nickel, Hach recommends using the
pHD sc ORP sensor equipped with an optional gold electrode.
Measuring Range -1500 to +1500 mV
Sensitivity ±0.5 mV
Stability 2 mV per 24 hours, non-cumulative
Operating Temperature Digital Sensor: -5 to 70ºC
(23 to 158ºF)
Analog Sensor with Digital Gateway: -
5 to 105ºC (23 to 221ºF)
Immersion Sensor: 0 to 50ºC
(32 to 122ºF)
Flow Rate 3 m (10 ft.) per second, maximum
Sensor Pressure/ Digital: 6.9 bar at 70ºC
Temperature Limits (100 psi at 158ºF)
Analog: 6.9 bar at 105ºC
(100 psi at 221ºF)
Built-in Temperature NTC 300 ohm thermistor for
Element analyzer temperature readout only—
no automatic temperature
compensation necessary for ORP
measurement
Transmission Distance 100 m (328 ft.), maximum
1000 m (3280 ft.), maximum when
used with a termination box
Sensor Cable (integral) 4 conductor cable with one shield
and polyurethane jacket; rated to
105ºC (221ºF); 10 m (33 ft.) standard
length
Wetted Materials PEEK
®
or Ryton
®
(PVDF), salt bridge
of matching material with Kynar
®
junction, glass and platinum (or
plastic and gold) process electrode,
titanium ground electrode, and Viton
®
O-ring seals
*Subject to change without notice.
PEEK
®
is a registered trademark of ICI Americas, Inc.; Ryton
®
is a registered
trademark of Phillips 66 Co.; Kynar
®
is a registered trademark of Pennwalt Corp.;
Viton
®
is a registered trademark of E.I. DuPont de Nemours + Co.
hach.com
2 Dierential pH and ORP Sensors
Specifications*
Dimensions
Convertible Style
Insertion Style
Continued on next page.
39.11 mm (1.54 inches)
271.3 mm (10.68 inches)
26.7 mm
(1.05 inches)
35.4 mm (1.36 inches)
1-inch NPT 1-inch NPT
232.15 mm (9.14 inches)
29.5 mm (1.16 inches)
49.8 mm (1.96 inches)
59.44 mm (2.34 inches)
26.7 mm (1.05 inches)
35.4 mm (1.36 inches)
1-inch NPT
59.44 mm (2.34 inches)
39.11 mm (1.54 inches)
232.15 mm (9.14 inches)
271.3 mm (10.68 inches)
29.5 mm
(1.16 inches)
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