Hach-Lange pHD sc - Manual (Page 10)

4
General Information
2.2 General Sensor Information
Optional equipment, such as mounting hardware for the probe, is supplied with
instructions for all user installation tasks. Several mounting options are available, allowing
the probe to be adapted for use in many different applications.
The electronics of the sensor are encapsulated in a PEEK ® or Ryton ® body. The pH
sensor has an integral NTC 300 ohm thermistor to automatically compensate pH readings
for temperature changes. ORP sensors have a fixed temperature value of 25 °C/300 ohm
(the ORP measurement is not temperature dependent).
2.2.1 Sensor Body Styles
pHD™ Differential pH and ORP sensors are available in three body styles:
• Convertible Body Style — has 1-inch NPT threads at both ends of the body for
mounting in any of the following configurations:
• into a standard 1-inch NPT pipe tee
• into a pipe adapter for union mounting with a standard 1-½ inch pipe tee
• onto the end of a pipe for immersion into a vessel
Note: The convertible style sensor can also be retrofitted into existing installations for 1-½ inch LCP,
Ryton, and epoxy sensors.
• Insertion Body Style — similar to the convertible sensor except that its
1-inch NPT threads are only on the cable end for mounting into a flow cell or the pipe
adapter of a ball valve hardware assembly. This hardware enables the sensor to be
inserted into or retracted from the process without stopping the process flow.
• Sanitary Body Style — features a built-in 2-inch flange for mounting into a 2-inch
sanitary tee. Included with the sanitary-style sensor is a special cap and EDPM
compound gasket for use with the sanitary hardware.
In addition, all probes are available with or without integral digital electronics.
For applications with extreme temperatures, the sensor without integral digital electronics
can be combined with the digital gateway.
Figure 1 Convertible Style Sensor Dimensions
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)