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E. pH ANTILOG (mA) OUTPUT
The analog output will produce an antilog analog output if the
user selects this option (see figure 3). The analog output will be
dependent on the pH _4 mA setting, pH _20 mA setting and the
current pH display.
mA
20mA
12mA
4mA
4mA
Set
Point
pH ANTILOG CURRENT OUTPUT
The pH ANTILOG output is based on the following equation:
mA
= 4mA + (16mA) * (10^
(pH)
Where:
mA
= analog output
(pH)
D
= current pH display
(pH)
pH(4)
= pH user setting for 4 mA
pH(2)
= pH user setting for 20 mA.
Note:
1. The user can set the 4mA and 20mA OUT from "0.00" to "19.99"
pH, but be reminded that the range of pH is –2.00 to 16.00 pH.
2. The absolute difference of the 4mA and 20 mA settings must be
greater or equal to 0.10pH or else the analog output will be
disabled.
pH
20mA
Set
Point
Figure 3
D(pH)
- 10^
26
mA
20mA
12mA
4mA
20mA
Set
Point
pH ANTILOG CURRENT OUTPUT
pH(4)
) / (10^
pH(20)
pH
4mA
Set
Point
- 10^
pH(4)
)
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