Thermo Fisher Scientific Alpha DO 2000 - Manual (Page 33)

Instruction manual
Alpha DO 2000
1. From the setup mode, select the “CNTR” screen and then press ENT key.
2. Selecting the controller type (TYP): Press ▲ 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. When the controller is set to OFF, all the LEDs
will be switch off in the Measurement mode
− 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.
Î NOTE: Please refer to Appendix 3 for detailed information on controller
settings.
Press 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 (REL): Press
▲
or
▼ key to choose the desired relay status (de-energized = “DEEN” or
energized = “EN”). Press ENT key to confirm your selection.
− If the controller is set to proportional control (P/PI):
4. Selecting the proportional controller type (TYP): Press ▲ or ▼ key to
select the suitable controller type (“PLC” = pulse length control, “PFC” =
pulse frequency control). Press 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 (REL): Press
▲ or ▼ key to choose the desired relay status (de-energized = “DEEN”
or energized = “EN”). Press ENT key to confirm your selection.
6. Setting the proportional range (PRP): Press ▲ or ▼ key to set the
proportional range (setting range: 10 to 500%). Press ENT key to
confirm your setting.
7. Setting the pulse length (T.PL): Press ▲ or ▼ key to set the pulse
length (setting range: 0.5 to 20 seconds). Press ENT key to confirm
your setting.
8. Setting the integral action time (IAT): Press ▲ or ▼ key to set the
integral action time (setting range: 0.0 to 999.9 minutes). Press ENT
key to confirm your setting.
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