Hach ORBISPHERE Manual Básico Del Usuario página 10

9. Continue turning until the cartridge is attached to the sensor, and the sensor is automatically
released from the container. The empty container, the screw top and packing component can be
discarded.
Note: It is normal that some of the electrolyte will overflow from the replacement cartridge and into the plastic
container.
10. Rinse the sensor under a tap for about 5 seconds to remove any excess electrolyte, then gently
wipe with a soft tissue to ensure all parts are completely dry. Drain the overflow electrolyte from
the container into a sink and flush away. Discard the used container.
11. If not using a protection cap with grille proceed to step 12. Otherwise take a new Dacron
patch from the box of O-rings in the recharge kit. Place the mesh in the center of the protection
cap. It is very important that the mesh is in the center of the protection cap and covering the
entire grille. Lower the sensor onto the protection cap making sure not to disturb the mesh.
12. Push the protection cap firmly into place, making sure one of the four slots in the protection cap
fits over the small locking pin (highlighted right). If it is necessary to turn the protection cap to fit
over the locking pin, ensure you only turn it clockwise to avoid unscrewing the cartridge.
13. Finally, screw the protection cap locking washer back into place in a clockwise motion, and
tighten finger tight.
Sensor installation
Sensor positioning information
Unless the sensor is part of the ORBISPHERE equipment that includes it, the sensor must be
installed in an ORBISPHERE socket or flow chamber, that allows contact with the sample fluid to be
analyzed.
The sensor and measuring instrument are connected by a cable and two 10-pin connectors. The
standard sensor cable length is 3 meters though extension cables of up to 1000 meters are available.
However, smart sensor technology is only available with distances of up to a maximum of
750 meters.
Note: If the model 28117 pressure sensor is used, the maximum cable length is 50 meters.
Ensure that the sensor will be mounted:
• perpendicular to the pipe
• horizontal
• on a horizontal pipe section (or on flow-ascending vertical pipe)
• minimum of 15 meters away from the pump's discharge side
• in a place where the sample flow is stable and rapid, and as far as possible from:
• valves
• pipe bends
• the suction side of any pumps
• a CO injection system or similar
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Note: There may be situations where not all the above conditions can be met. If this is the case, or you have any
concerns, please consult your Hach Lange representative to appraise the situation and define the best applicable
solution.
Sensor insertion
Note: Check that the small O-ring at the bottom of the flow chamber is present during removal and installation of
the sensor, as it may stick to the sensor head and fall.
• Insert the sensor straight into the flow chamber or socket.
• Hand tighten the attaching collar.
• Connect the sensor cable.
• Check for leaks; replace O-rings if product leaks are visible.
Note: Do not twist the sensor when inserting it into a micro volume flow chamber. This rotation may twist the
membrane holding ring, thus changing the membrane position. This can modify the membrane measuring
conditions, and affect measurement precision.
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mesh