Hach-Lange ORBISPHERE 31xxx Thermal Basic User Manual - Manual (Page 9)

Sensor positioning
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 the contact with the sample fluid to
be analyzed.
The sensor and measuring instrument are connected by a cable and 10 pin connector. The standard
sensor cable length is 3 meters.
Ensure that the sensor will be mounted:
• perpendicular to the pipe
• 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
2
injection system or similar
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
• Insert the sensor straight into the flow chamber or socket. Do not twist the sensor.
• Hand tighten the attaching collar.
• Connect the sensor cable.
• Check for leaks; replace O-rings if product leaks are visible.
Instructions for micro volume flow chambers
Do not twist the sensor when inserting it into a micro volume flow chamber. This rotation may twist
the protection cap, thus changing the membrane position. This can modify the membrane measuring
conditions, and affect measurement precision.
Sensor removal
• Shut off the sample flow and drain the sampling circuit from liquid or gas pressure.
• Remove the sensor cables connected at the sensor side.
• Remove the purge gas connections.
• Hold the sensor body in one hand to avoid rotation, and unscrew the collar with other hand.
• Pull the sensor straight out of its socket, or flow chamber.
• Check that both O-rings remain in place inside the flow chambers.
• Install the storage cap on the sensor.
English 9