26
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
.
The pH ANTILOG 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(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.
Figure 3
mA
Set
Point
Set
Point
4mA
20mA
20mA
4mA
Point
Set
Point
Set
pH
mA
pH
12mA
12mA
4mA
20mA
4mA
20mA
pH ANTILOG CURRENT OUTPUT
pH ANTILOG CURRENT OUTPUT
Summary of Contents for 6309 POT
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