Removing / Inspecting / Cleaning Tri-Sensor; Tri-Sensor Assembly Overview; Inspect Tri-Sensor - Autopilot Pool Pilot Professional PPP-2 Owners & Installation Manual

6.2 Removing / Inspecting / Cleaning Tri-sensor

6.2.a Tri-sensor Assembly Overview
The Tri-sensor Assembly is used to measure water flow, salt level, and water temperature.
Note: The use of high strength magnet devices in the close proximity of the Tri-sensor can cause
the flow switch to function incorrectly.
When the water flow reaches a minimum flow rate of 20
l
gpm (76 L/min), the flow paddle magnet closes a micro-
switch monitored by the Pool Pilot
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The Pool Pilot uses dedicated salt sensor blades to
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measure the level of salt in the water.
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The Pool Pilot uses the temperature sensor to determine
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water temperature. This measurement is required for the
Patented Automatic Temperature Compensation feature
to automatically adjust chlorine output as water
temperature varies. Less chlorine is needed in cold water,
so chlorine output is automatically reduced as water
temperature drops (avoiding excess chlorine production).
Conversely, more chlorine is needed in warmer water, and
production is automatically adjusted higher as water temperature increases.
Please note - The Tri-sensor normally does not require maintenance or cleaning.
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6.2.b Inspect Tri-sensor
1. Disconnect the Tri-sensor cable from the power center.
2. Remove the two (2) screws retaining the Tri-sensor in the Tee joint of the manifold.
Note the orientation of the Direction of Flow Tab. The Tri-sensor must be installed in the same
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orientation when it is reinstalled or replaced.
3. The Tri-sensor can now be pulled out of the Tee.
CAUTION - Failure to heed the following may result in equipment damage.
The Tri-sensor should not be removed from manifold at an angle or the flow paddle and / or flow post
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may be damaged.
Firmly grip the Tri-sensor assembly (this is typically done with a large pair of channel lock pliers).
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Twist the Tri-sensor back-and-forth while simultaneously pulling the Tri-sensor straight out of the Tee
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joint.
4. Check the Tri-sensor assembly for any damage to the plastic housing and replace if needed.
5. Inspect the following on the flow switch:
Verify the thin metallic paddle is straight and free from erosion.
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Verify the plastic post is straight and free of cracks. (Do not twist or bend the paddle or the
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plastic post.)
6. Inspect the two salt sensor blades. The blades should not have any mineral deposits (scale) or other
debris on them.
Do not use any metallic objects to scrape the blade surfaces or you will remove or damage the
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blade sensor coating.
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Figure 10
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