EUTECH INSTRUMENTS ALPHA CON 500 2-WIRE TRANSMITTER Betriebsanleitung PDF herunterladen (Seite 23)

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

2) Press the ENTER key until the upper display shows Lo or Hi 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 the ENTER key to confirm.

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.

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 external

devices 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.

1) Follow directions in 7.3.1 to enter Control

Relay mode.

2) Press the ENTER key. Scroll with the ∆

∆∆

∆ or ∇

∇∇

∇

keys until the upper display shows the hysteresis

(dead band) value and the lower display shows

“HYS”.

3) Press the ∆

∆∆

∆ or ∇

∇∇

∇ keys to enter your hysteresis value for Set point 1 (Set

point 2). Your controller will activate at the value you select.

4) Press the ENTER key to confirm your selection.

0.50

HYS

SETUP

HOLD

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