Specifications

3. Operation MI 611-211 – October 2005
19
Config Electrod
(Refer to “Structure Diagram 2” on page 39.)
NOTE
This parameter will not appear if ORP was selected as PRIMARY DISPLAY.
This section of the structure asks you to specify the electrode:
♦ If measuring pH: Your choices are GLASS, ANTIMONY, or OTHER. GLASS sets
the isopotential point at 7 pH.
ANTIMONY sets it at 1 pH. OTHER allows the
isopotential point to be set manually.
♦ If measuring ISE: You must specify the ion polarity. A positive ion selective
measurement gets more positive (mV-wise) as the concentration increases (e.g., Na
+
,
K
+
). A negative ion selective measurement gets more negative (mV-wise) as the
concentration increases (e.g., F
–
, S
–2
). For fluoride measurements, this parameter
should be set to negative.
NOTE
A change in the electrode requires a calibration.
Config Tempcomp
(Refer to “Structure Diagram 2” on page 39.)
NOTE
This parameter will not appear if ORP was selected as PRIMARY DISPLAY.
This section of the structure asks you to specify the temperature compensation if you are
measuring pH or ISE.
If measuring pH, specify STANDARD, AMMONIA, or CUSTOM. STANDARD assumes a glass
or antimony electrode and applies the Nernst equation. The nominal temperature compensation
range is -5 to +105° C (23 to 221° F). AMMONIA compensates for traces of ammonia in addition
to the standard compensation. CUSTOM allows you to specify particular solution characteristics
into the transmitter’s memory. When using this compensation, all measurements will be corrected
back to a reference temperature measurement value. Therefore, you are asked to specify a
reference temperature and a number of points to plot a compensation curve. The reference
temperature (
REF TEMP) should be within the nominal temperature compensation range. The
number of points (NUM PTS) can be specified from 2 to 21 points and has a default value of 2.
Each point specifies a value at a certain temperature. The temperatures (
TEMPx) should be
within the nominal temperature compensation range. The temperature units are specified in the
next section. The values (
VALx) can be specified from -2.00 to +16.00 pH and have a default
of 0.00.
If ISE was chosen as your PRIMARY DISPLAY, you must specify STANDARD or CUSTOM.
CUSTOM causes you to specify a reference temperature and a number of points to plot a
compensation curve. The number of points (NUM PTS) can be specified from 2 to 21 points and
has a default of 2. Each point specifies a value at a certain temperature. The temperature units are
specified in the next section. The values (VALx) can be specified from 0 to 2000 ppm and have a
default of 0.