What's the difference between self-closing and metered lav faucets?

[Yikes]

The City of LA modified the California Plumbing Code to read as follows:
407.2.4. All faucets in public restrooms shall be self-closing or self-closing metering faucets. Metered faucets shall deliver a maximum of 0.20 gallons (0.76 L) per metering cycle.

Q1. What is the difference between a (1) self-closing faucet and (2) a self closing metering faucet?
I'm guessing that (1) is time-based shutoff and (2) is time or volume of water based shutoff, whichever happens first. But I'd like your opinion.

Q2. Is a motion-activated faucet considered self-closing? It's relying not on time, but on the action of a person moving their hands away from the sensor.

 

[wwhitney]

FWIW, the City of LA also added a definition of "self-closing faucet":

Self-Closing Faucet. A faucet designed to close itself as the activating mechanism is released.

So if on a motion-activated faucet proximity to the sensor is the "activating mechanism" then you could say that moving your hands away from the sensor is "releasing" the activating mechanism.

Cheers, Wayne

 

[wwhitney]

As to Q1, seems like it doesn't matter? The first sentence of 407.2.4 may be parsed as "All faucets in public restrooms shall be self closing OR (self-closing and metering) faucets. Which just logically reduces to "all faucets in public restrooms shall be self-closing faucets."

I guess you still have to determine if your self-closing faucet is a "metered faucet" as then the second sentence imposes a requirement you have to satisfy. For example, maybe that sentence is trying to say that the water delivered by a motion-activated faucet after you remove your hands must be no more than 0.20 gallons.

Cheers, Wayne

 

[mark handler]

A "self-closing" faucet automatically shuts off after a short period of time once the handle is released, while a "metered" faucet is designed to dispense a specific, predetermined volume of water with each activation, essentially limiting the water used per use regardless of how long the handle is held open; both are often used in public restrooms to conserve water, but metering faucets provide a more precise control over water usage.

 

[Yikes]

A "self-closing" faucet automatically shuts off after a short period of time once the handle is released, while a "metered" faucet is designed to dispense a specific, predetermined volume of water with each activation, essentially limiting the water used per use regardless of how long the handle is held open; both are often used in public restrooms to conserve water, but metering faucets provide a more precise control over water usage.

Mark, would you agree with Wayne that a touchless motion sensor faucet meets the definition of self-closing faucet?

 

[Gregg Harris]

I agree with Wayne about the motion sensor. A side note, ADA requires a minimum of 10 seconds of run time.