Autopilot Pool Pilot Digital Nano, Owners And Installation Manual, Page: 18 / 56

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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.
Figure 5
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When the water flow reaches a minimum flow rate of 20
gpm (76 L/min), the flow paddle magnet closes a micro-
switch monitored by the Pool Pilot
®
. (The CoPilot
®
Ozone
manifold requires a minimum flow of 25 gpm (95 L/min).)
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The Pool Pilot
®
uses dedicated salt sensor blades to
measure the level of salt in the water.
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The Pool Pilot
®
uses the temperature sensor to determine
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.
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Please note - The Tri-sensor normally does not require maintenance or cleaning.
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.
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Note the orientation of the Direction of Flow Tab. The Tri-sensor must be installed in the same
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.
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The Tri-sensor should not be removed from manifold at an angle, or the flow paddle and / or flow post
may be damaged.
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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
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:
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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
plastic post.)
6. Inspect the two salt sensor blades. The blades should not have any mineral deposits (scale) or other
debris on them.
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Do not use any metallic objects to scrape the blade surfaces, or you will remove or damage the
blade sensor coating.