21
pH
ANTILOG
output .
pH/TEMP.
LINEAR
output.
C.
pH ANTILOG OUTPUT
The pH mA output will produce a antilog analog output if the
user selects ‘ANTILOG’ in the pH mA SETTING page (see
figure 2
).
The pH analog output is calculated using
pH_4 mA setting, pH_20
mA setting
and the
current pH display.
The pH ANTILOG analog output is based on the following
equation:
mA
(pH)
= 4mA + (16mA) * (10^
D(pH)
- 10^
pH(4)
) / (10^
pH(20)
- 10^
pH(4)
)
Where:
mA
(pH)
= analog output
D
(pH)
= current pH display
pH(4)
= pH user setting for 4 mA
pH(20) = pH user setting for 20 mA.
Note :
1. The range for 4mA and 20mA settings is 0.00 to 14.99 pH.
2. The absolute difference of the 4mA and 20 mA settings must be
mA
pH/DO
pH
Set
Point
Set
Point
4mA
20mA
20mA
4mA
Point
Set
Point
Set
pH
pH/DO
mA
mA
pH
Set
Point
Set
Point
4mA
20mA
20mA
4mA
Point
Set
Point
Set
pH
mA
pH
12mA
12mA
12mA
12mA
4mA
20mA
4mA
20mA
20mA
4mA
20mA
4mA
Figure 2
