Myron L 4P (includes Addendum 10-01) - Manual (Page 7)

B. Measuring Resistivity
Resistivity is for low conductivity solutions. In a cell cup the value may drift
from trace contaminants or absorption from atmospheric gasses, so
measuring a flowing sample is recommended.
1. Hold instrument at 30° angle (cup sloping downward).
2. Let sample flow continuously into conductivity cell with no
aeration.
3. Press key; use best reading.
NOTE: If reading is lower than 10 kilohms, display will be dashes: [ - - - - ].
Use Conductivity.
V. SOLUTION SELECTION
A. Why Solution Selection is Available
Conductivity, Resistivity, and TDS require temperature correction to 25°C
values (ref. Standardized to 25°C, pg. 23). Selection determines the
temperature correction of conductivity and calculation of TDS from
compensated conductivity (ref. Cond. Conversion to TDS, pg. 26).
B. The 4 Solution Types
On the left side of the display is the salt solution characteristic used to
model temperature compensation of conductivity and its TDS
conversion. Generally, using KCl for conductivity, NaCl for resistivity and
442 (Natural Water characteristic) for TDS will reflect present industry
practice for standardization. This is the setup as shipped from the factory
(ref. Solution Characteristics, pg. 26).
The USER selection allows a custom value to be entered for the
temperature compensation of conductivity and also the conversion ratio if
measuring TDS.
C. Calibration of Each Solution Type
There is a separate calibration for each of the 4 solution types. Note that
calibration of a 442 solution does not affect the calibration of a NaCl
solution. For example: Calibration (ref. Conductivity or TDS Calibration,
pg. 14) is performed separately for each type of solution one wishes to
measure (ref. Conductivity/TDS Standard Solutions, pg. 22).
D. Procedure to Select a Solution
N O T E : Check display to see if solution displayed (KCl, NaCl, 442 or
USER) is already the type desired. If not:
10
R E S
1. Press , or to select the parameter on which
you wish to change the
solution type.
2. Press and hold key
about 3 seconds to make
“
S E L ” appear (see Figure 1).
(For demonstration purposes,
all 4 solution types are shown simultaneously.)
3. Use or key to obtain type of solution desired (ref.
Solution Characteristics, pg. 26). The selected solution type will
be displayed: KCl, NaCl, 442 or User.
4. Press to accept new solution type.
E. Application of USER Solution Type
1. User Programmable Tempco
This feature allows you to change your Ultrameter’s temperature
compensating factor to another factor between 0-9.99%/°C (ref.
Temperature Compensation, pg. 23).
a. As in Procedure to Select a Solution, pg. 10, select “USER”
mode.
b. With “USER” mode now selected, press . You may now
adjust a temperature compensation from .00%/°C to 9.99%/°C,
by pressing or .
See example in Figure 2.
c. Press twice to skip
calibration adjustment and
accept the new tempco (3
times if in TDS mode). You are now ready to measure samples
with your new temperature compensation factor.
11
M S
MR
CAL
MCLR
CAL
MCLR
R E S COND T D S
CAL
MCLR
M S
MR
CAL
MCLR
Figure 2
COND
°C % /
User
Figure 1
KCl
NaCl
User
4 4 2