Thermo Scientific Alpha pH 560
29
configured set point value, otherwise the default value. P
Press
Ÿ
or
ź
key to enter the value for set point 1, at which control
function of the pH Controller should activate.
Press ENT key to confirm your set point value.
3
Select relay function: The upper display shows the last
configured relay function (L
LO = Low or H
HI=High). P
Press
Ÿ
or
ź
key to select the desired function.
Press ENT key to confirm your selection.
N
NOTE: This parameter lets you choose the relay function.
Select ‘LO’ to activate the relay when the pH
reading undershoots the set point (SP1) or select
‘HI’ to activate the relay when the pH reading
overshoots the set point (SP1). SP1 and SP2 can be
selected as ‘LO/LO’, ‘LO/HI’, ‘HI/LO’, or ‘HI/HI’.
4
Setting hysteresis value: The lower display shows ‘H
HYS’. The
upper display shows the last configured value, otherwise the
default value. P
Press
Ÿ
or
ź
key to enter the hysteresis value
for set point 1. Allowable range: 0 to 1.00 pH.
Press ENT key to confirm your hysteresis value.
N
NOTE: Hysteresis prevents rapid relay contact switching if
the pH reading is fluctuating near the set point.
Refer to A
Appendix IV for a graphical representation
of the hysteresis.
5
5
Setting on-delay time: The lower display shows ‘O
On.d’. The
upper display shows last configured on-delay value. P
Press
Ÿ
or
ź
key to enter the on-delay time for set point 1. Allowable
range: 0 to 2000 seconds. When the pH reading is reached the
set point 1, the pH Controller delays the relay activation
(switch on) by the on-delay time you set here.
Press ENT key to confirm your on-delay time.
6
Setting off-delay time: The lower display shows ‘O
OF.d’. The
upper display shows last configured off-delay value. P
Press
Ÿ
or
ź
key to enter the off-delay time for set point 1. Allowable
range: 0 to 2000 seconds. When the pH reading is reached the
set point 1 plus hysteresis value, the pH Controller delays the
relay deactivation (switch off) by the off-delay time you set
here.
Press ENT key to confirm your off-delay time. The pH
Controller reverts to S
SP1 screen.
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