Autopilot APCEPH1 Manual de instrucciones - Página 4

Navegue en línea o descargue pdf Manual de instrucciones para Controlador Autopilot APCEPH1. Autopilot APCEPH1 13 páginas. Ph controller

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INSTRUCTION MANUAL

How it worKs

Although the APCEPH1 may seem

complicated, the basic operation of the

unit is actually quite simple. The example

below describes the operation of the

APCEPH1 being used to lower the pH of a

water tank / reservoir or aquarium.

Let's assume that the user has selected pH

down control with the following settings:

pH = 6.0

dosing time = 10 seconds

mixing time = 2 minutes

pH deadband = 0.2

pH up or Down = Down

The pH sensor probe constantly measures

the pH of the water to be controlled. In

this example, when the pH levels rises

beyond 6.0 ph, the unit will activate the

dosing pump for 10 seconds.

After the dosing pump stops, the mixing

timer will start to count down for 2

minutes. The mixing timer is important to

allow sufficient time for the pH adjustment

acid to completely mix into the water.

During the mixing time, the unit is waiting

for the water to react to the addition of

the pH adjustment liquid.

By adding only a small amount of pH

adjustment each dosing "cycle", the pH

level can be lowered slowly to the desired

level. If too much pH adjustment is added

to the water or if the mixing timer is set

pH stock adjustment

liquid reservoir

*Provided by user

The "sample" pump will constantly operate

to provide a sample of the current nutrient.

The sample pump will also mix and aerate

the nutrient.

Chemical

tubing

Hydroponic nutrient

reservoir

*Provided by user

too low, the pH level could "over-shoot"

the desired pH level.

Once the mixing timer counts down to

zero, the unit will again measure the pH

level and determine if another dose is

required (this is where the deadband

setting works).

In this example, the pH deadband is set

at 0.2 pH. So if the pH sensor detects that

the level has dropped from 6.0 to 5.8 or

below, no other doses are required and the

controller will not activate another dosing

cycle. If the unit measures the pH to still be

above 5.8 pH, additional pH dosing cycle(s)

will continue to occur until the pH level

goes down below the pH setting MINUS

the deadband setting. (The deadband

setting works just the opposite when

raising the pH level... pH setting PLUS the

deadband).

By adding pH adjustment slowly in small

amounts, the pH level will gradually go

down to the desired level without "over-

shooting" the pH setpoint.

Ideally, the user should start with a low

setting for the dose time and a high setting

for the mixing time to allow plenty of time

for the pH adjustment to stabilize.

If the user has a large quantity of water to

be controlled, the dosing and mixing timer

settings may need to be increased. Smaller

quantities of water can use lower dosing

and mixing times.

Peristaltic

pump

sensor

SAM-1

www.hydrofarm.com

APCEPH1

D1-

PHC

Sensor

interface cable

Temp sensor

Sample pump

(operates 24 hours)