21Instruction Manual
SECTION 4 - OPERATION
The smoothing of the input signal is determined by
delta (pH) time. The ‘Response Rate’ is the time
that the computer display takes before it updates
the pH readings.
The following values can be programmed
(min : sec):
00 : 01 00 : 10 00 : 20 00 : 30. . . . . . 04 : 00
(In increments of 10 seconds)
When 00 : 01 is programmed the controller
responds to a change in input in one (1) second.
If 00 : 10 is selected the controller responds to
a change in input in ten (10) seconds. (i.e., The
value displayed is the average of the 10 previous
1 second readings.)
Examples:
The sampling time (delta) is 00 : 10 and the current
reading is 2.00 pH.
When the pH input is increased instantaneously
to 12.00 pH, the display will respond as follows:
Seconds
0
1 2 3 4 5 6 7 8 9 10 11
pH
2 3 4 5 6 7 8 9 10 11 12 12
If the sampling was 00 : 01 seconds, the response
would be:
Seconds
0
1 2 3 4 5 6 7 8 9 10 11
pH
2 12 12 12 12 12 12 12 12 12 12 12
Press the
- TIMERS -
key to advance to set temperature.
This setting is relevant when no temperature probe
(1000 Ω platinum RTD) is connected.
25
o
C
Manual
4.5.5 Display Key
While in the Run Mode the
DISPLAY
key can be
pressed once to display current parameters. Each
screen will come up for three (3) seconds and then
returns to pH display or System Run automatically
(screens shown below are: mV, °C, and mA).
Pump A
Pump B
12.8
mV
ATC
8.50
Run pH
+ 3 Seconds
Pump A
Pump B
26.2
o
C
ATC
8.50
pH
+ 3 Seconds
Pump A
Pump B
12.00
mA
ATC
8.50
pH
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