Thermo Fisher Scientific Alpha COND 2000 (In the process of updating the brand guideline & product image) - Manual (Page 28)

Instruction Manual
αlpha CON 2000
22
6.4 Control Relay A / 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 two sub-functions have the same set-up
parameters, only SP1 is described here.
SETUP SETUP
HOLD HOLD
4 4
SETUP
SETUP
HOLD
HOLD
4
4
SETUP SETUP
SETUP
HOLD HOLD
HOLD
4 4
4
µS
ENT ENT ENT
ENT
ENT
ENT
1 2 3
3
4 5
6
4. Select the “SP1” (Relay A) sub-function and then press the ENT key.
5. Setting set point value: Press the ▲ or ▼ key to enter the value for set point 1 (SP1) at which
your controller will activate. Press the ENT key to confirm your setting.
6. 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 conductivity value undershoots the low set point; select “HI” to
activate the relay when the value overshoots the high set point. SP1 and SP2 can
be selected as “Lo/Lo”, “Lo/Hi”, “Hi/Lo”, or “Hi/Hi”.
7. Setting a hysteresis value (HYS): Press the ▲ or ▼ key to select the desired hysteresis (setting
range: 0 to 10% of full scale) for set point 1. Press the ENT key to confirm your setting.
Note: Hysteresis prevents rapid contact switching if your 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 1900 µS and your hysteresis value is 20 µS. If
your measured value overshoots 1900 µS, the controller’s relay activates. The actions of the
external device will cause the solution’s conductivity to drop. The relay will deactivate, when
the conductivity value drops below 1880 µS.