EUTECH INSTRUMENTS ALPHA DO 500 DISSOLVED OXYGEN Manual de Instruções descarregar pdf (Página 28)

Instruction manual αlpha DO 2000

1. Select the “CNTR” subfunction, then press the ENT key.

2. Selecting the controller type: press the ▲ or ▼ key to select the suitable controller type:

− OFF = controller off

Use control Off to operate controller as a monitor only or to prevent relays from

switching.

− L.CT = limit value control (on/off control).

Use limit control with pumps or valves for fast response

− P/PI = proportional/integral control

Use proportional control to operate your pumps smoothly or for precise control of

proportioning valves. Use PI controller to eliminate steady state error.

Note: please refer to Appendix 4 for detailed information on controller settings.

Press the ENT key to confirm your selection.

− If the controller is set to limit value control (L.CT):

3. Selecting the relay status under Non-Alarm condition: press the ▲ or ▼ key to choose

the desired relay status (de-energized = “DEEN” or energized = “EN”). Press the ENT key to

confirm your selection.

− If the controller is set to proportional control (P/PI):

4. Selecting the proportional controller type: press the ▲ or ▼ key to select the suitable

controller type (“PLC” = pulse length control, “PFC” = pulse frequency control). Press the ENT

key to confirm your selection.

− If the proportional controller type is set to pulse length control (PLC):

5. Selecting the relay status under Non-Alarm condition: press the ▲ or ▼ key to choose

the desired relay status (de-energized = “DEEN” or energized = “EN”). Press the ENT key to

confirm your selection.

6. Setting the proportional range: Press the ▲ or ▼ key to set the proportional range (setting

range: 10 to 500%). Press the ENT key to confirm your setting.

7. Setting the pulse length: Press the ▲ or ▼ key to set the pulse length (setting range: 0.5 to

20 seconds). Press the ENT key to confirm your setting.

8. Setting the integral action time: Press the ▲ or ▼ key to set the integral action time

(setting range: 0.0 to 999.9 minutes). Press the ENT key to confirm your setting.

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EUTECH INSTRUMENTS ALPHA DO 500 DISSOLVED OXYGEN Manual de Instruções Página 28