EUTECH INSTRUMENTS ALPHA PH1000 PHORP CONTROLLERTRANSMITTER Manual de instrucciones descargar pdf (Pagina 21)

7.3 Control Relay A/ Control Relay B (SP1/SP2) sub-function

The SP1 option sets operating parameters for Relay A; the SP2 option sets operating

parameters for relay B. Since these groups have the same set-up parameters, they are

described together.

7.3.1 Entering Set point 1 (Set point 2) sub-function

Enter Advanced Set-up mode. Press the ENTER key and

scroll to Advanced Set-up security code “22”. Press the ENTER

key again.

2) Press ▲ or ▼ key to scroll until upper display shows SP1

(SP2).

7.3.2 Selecting set point values

This lets you choose the value that will cause your controller to

activate (i.e. pH 9.0).

1) Follow directions in 7.3.1 to enter Control Relay mode. If you

are in this mode, skip to step 2.

2) Press ENTER key. The upper display shows current set point

value and lower display shows SP1 (SP2).

3) Press ▲ or ▼ key to enter value for Set point 1 (Set point 2).

Your controller will activate at the value you select.

4) Press ENTER key to confirm your selection.

5) Proceed to 7.3.3 step 3, or return to Measurement mode by

pressing the ▲ and ▼ keys simultaneously (escape).

7.3.3 Choosing High or Low set points

Select a low set point to activate controller when the pH/ORP value goes below the low set

point; select a high set point to activate controller when the value overshoots the high set point.

Using both SP1 and SP2, you can select lo/lo, lo/hi, hi/lo, or hi/hi set points.

1) Follow directions in 7.3.1 to enter Control Relay mode.

2) Press ENTER key. Scroll with the ▲ or ▼ keys until upper display shows Lo or Hi (for low

or high set point) and the lower display shows SP1 (SP2).

3) Press the ▲ or ▼ keys to select low (lo) or high (hi) set point for SP1 (SP2).

4) Press ENTER key to confirm your selection.

5) Proceed to 7.3.4 step 3, or return Measurement mode by pressing the ▲ and ▼ keys

simultaneously (escape).

7.3.4 Selecting a hysteresis (dead band) value

Hysteresis prevents rapid contact switching if your value is fluctuating near the set point. It does

this by overshooting the set point value to a specified hysteresis value. You can set the

hysteresis value from 0.1 to 1.0 pH, 10 to 100mV or 1 to 10%.

Example: You have set your high set point at pH 9.0 and your hysteresis limit value at pH 0.5. If

your measured value overshoots the high set point pH 9.0, the controller’s relay activates, which

in turn activates an external device such as a pump or valve. The actions of the external device

will cause the solution’s pH to drop. When the pH drops to 8.

5 pH, the relay and hence the pump

will switch off.

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