Instruction manual

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

The SP1 sub-function determines the operating parameters for Relay A;

while SP2 defines the operating parameters for Relay B. Since these groups

have the same set-up parameters, they are described together.

SETUP

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ENT

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1. Select the “SP1” (Relay A) or “SP2” (Relay B) sub-function, then press

the ENT key.

2. Setting set point value: press ▲ or ▼ key to enter the value for set

point 1 (set point 2) at which your controller will activate. Press the ENT

key to confirm your setting.

3. Selecting relay function: press the ▲ or ▼ key to select the desired

relay function (“LO”= low or “HI”= high). Press the ENT key to confirm

your selection.

Note: This parameter lets you choose the relay function. Select “LO” to

activate the relay when the pH/ORP value undershoots the set point;

select “HI” to activate the relay when the value overshoots the set point.

SP1 and SP2 can be selected as “Lo/Lo”, “Lo/Hi”, “Hi/Lo”, or “Hi/Hi”.

4. Setting a hysteresis value: press the ▲ or ▼ key to select the desired

hysteresis (setting ranges: 0.1 to 1.0 pH, 10 to 100mV or 1 to 10%) for set

point 1 (set point 2). Press the ENT key to confirm your setting.

Note: Hysteresis prevents rapid contact switching if the measured value

is fluctuating near the set point. Please refer to Appendix 3 for a

graphical representation of the hysteresis.

Example: You have set your high set point at pH 10.0 and your

hysteresis value at pH 0.5. If your measured value overshoots pH 10.0,

the controller’s relay activates. The actions of the external device will

cause the solution’s pH to drop. The relay will deactivate, when the pH -

value drops below 9.5 pH.

5. Setting the on-delay time lag: press the ▲ or ▼ key to enter the on-

delay time for set point 1 (set point 2). The controller will delay activation of