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7.13 YSI Sensor or Plug Removal (for storage or replacement)
All YSI sensors in the bulkhead can be removed for storage or replacement. However, not all should be removed for
storage. YSI recommends that the conductivity/temperature sensor and ROX Dissolved Oxygen sensor remain in the
bulkhead during long-term storage.
Ensure the Port is Dry
Be sure to keep the probe ports dry during probe replacement, removal, or installation. Use compressed air to dry out
the ports before you install any sensors to remove trace moisture. If you suspect or know that water has entered the
port: blow with compressed air, then pour a small amount of isopropyl alcohol in the port and allow it to evaporate.
Rinse the port out with DI water and then dry the port again with compressed air.
Check the O-Rings
• Be sure to check and service the o-rings anytime the sensors are removed.
• Remove the o-rings from their groove with a small, flat-bladed screwdriver.
Do not use any sharp instruments to remove the o-rings, this may damage the o-ring or groove.
• Clean the o-rings with water and a mild detergent (no alcohol).
• Wipe the o-rings dry with Kimwipes ® or other lint-free cloth.
• Apply a very small amount of Teflon stopcock grease to the o-rings by putting the grease on your fingers and
drawing the rings slowly the grease. More grease does not equal better.
• Replace the o-ring in the groove. Verify that the ring does not look twisted or rolled in the groove.
• Rub a very small amount of grease onto the surface of the o-ring.
Remove, Replace or Install Sensor or Plugs.
Optical probes and plugs use the short end of the probe tool. pH/ORP and temperature/conductivity use
the long end. If you lose the probe tool, you may substitute them with 7/64" and
9/64" hex keys. Loosen and tighten sensors by the metal sheath at the base of
the sensor ONLY.
To Remove:
Insert the probe tool into the hole at the base of the sensor.
Loosen by turning to the left.
Loosen probe or plug until it can be finger-loosened and removed.
To Insert:
Align the two connectors in the hole.
Finger-tighten the probe or plug by turning it to the right (turn probe at
metal base).
Snug the sensor down with probe tool, but do not over tighten.
NOTE
7.1