Operating Instructions
α
lpha-CON1000
68X216802
17
7.3
Control Relay A/Control Relay B (SP1/SP2) sub-function
The SP1 option sets the operating parameters for Relay A; and SP2 for relay B. Since these groups
have the same set-up parameters, they are described together.
7.3.1
Entering the Set point 1 (Set point 2) sub-function
1)
Enter Advanced Set-up mode. Push the ENTER key and
scroll to Advanced Set-up security code “22”. Push the ENTER
key again.
2)
Press the
∆∆
or
∇
∇
keys to scroll until the upper display
shows SP1 (SP2).
7.3.2
Selecting the set point values
This lets you choose the value that will cause your controller to
activate (Default: SP1 = 6.20mg/l; SP2 = 4.00mg/l).
1)
Follow directions in 7.5.1 to enter Control Relay mode. If
you are in this mode, skip to step 2.
2)
Press the ENTER key. The upper display shows the
current set point value and the lower display shows SP1 (SP2).
3)
Press the
∆∆
or
∇
∇
keys to select your 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.
5)
Proceed to 7.5.3, or return to Measurement mode by
pressing the
∆∆
and
∇
∇
keys simultaneously (escape).
7.3.3
Choosing High or Low set points
Select a low set point to activate controller when the dissolved oxygen value undershoots the low set
point; select a high set point to activate controller when the value overshoots the high set point. Using
both SP1 and SP2, you can select lo/lo, lo/hi, hi/lo, or hi/hi set points (Default: SP1 = Lo; SP2 = Lo).
1)
Follow directions in 7.5.2 to enter Control Relay mode.
2)
Press the ENTER key. Scroll with the
∆∆
or
∇
∇
keys until the upper display shows Lo or Hi (for low
or high set point) 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 your selection.
5)
Proceed to 7.5.4, or return Measurement mode by pressing the
∆∆
and
∇
∇
keys simultaneously
(escape).
7.3.4
Selecting a hysteresis (dead band) value (0.1 to 1.0 mg/l or 1 to 10%)
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 (default is 0.2 mg/l or 2.5%). You can set
the hysteresis value from 0.1 to 10 mg/l, 0.1 to 10 ppm or 1 to 10%.
HOLD SETUP
HOLD SETUP
HOLD SETUP
HOLD SETUP
HOLD SETUP
HOLD SETUP
SP 1
SP 1
Lo
Lo
SP 1
SP 1
20
20
HYS
HYS
00
On.d
On.d
00
Of.d
Of.d
100
100
SP 1
SP 1
SP
SP 11
Lo
Lo
SP
SP 11
100
100
µµ
SS
SP
SP 11
HOLD SETUP
HOLD SETUP
HOLD SETUP
