Hach pHD Manual Básico Del Usuario página 6

Section 4 Installation
4.1 Mounting
Explosion hazard. For installation in hazardous (classified) locations, refer to the instructions and
control drawings in the controller Class 1, Division 2 documentation. Install the sensor according to
local, regional and national codes. Do not connect or disconnect the instrument unless the
environment is known to be non-hazardous.
Explosion hazard. Make sure that the mounting hardware for the sensor has a temperature and
pressure rating sufficient for the mounting location.
Personal injury hazard. Broken glass can cause cuts. Use tools and personal protective equipment to
remove broken glass.
The process electrode at the pH sensor tip has a glass bulb, which can break. Do not hit or push on the glass
bulb.
The gold or platinum process electrode at the tip of the ORP sensor has a glass shank (hidden by the salt bridge),
which can break. Do not hit or push on the glass shank.
• Install the sensor where the sample that comes into contact with the sensor is representative of
the entire process.
• Refer to the expanded user manual on the manufacturer's website for the available mounting
hardware.
• Refer to the instructions supplied with the mounting hardware for installation information.
• Install the sensor at least 15° above horizontal.
• For immersion installations, put the sensor at least 508 mm (20 inches) from the aeration basin
wall and immerse the sensor at least 508 mm (20 inches) into the process.
• Remove the protective cap before the sensor is put into the process water. Keep the protective
cap for future use.
• (Optional) If the process water is near the boiling temperature, add gel powder
cell solution in the sensor. Refer to step 2 of
the salt bridge.
• Calibrate the sensor before use.
For examples of sensors in different applications, refer to
2
The gel powder decreases the evaporation rate of the standard cell solution.
6 English
W A R N I N G
W A R N I N G
C A U T I O N
N O T I C E
N O T I C E
Replace the salt bridge
Figure 2
2
to the standard
on page 16. Do not replace
and Figure 3.