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. 32).
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. 15) is performed separately for each type of solution one wishes to
measure (ref. Conductivity/TDS Standard Solutions, pg. 28).
D. Procedure to Select a Solution
NOTE: Check display to see if solution displayed (KCl, NaCl, 442 or
USER) is already the type desired. If not:
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
“SEL” 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. 32). 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.
12
MS
MR
CAL
MCLR
COND
TDS
CAL
MCLR
RES
Figure 1
KCl
NaCl
User
442
Temperature Compensation, pg. 29). This feature does not apply to pH
or ORP.
a. As in Procedure to Select a Solution, pg. 12, 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.
2. Disabling Temperature Compensation
a. As in Procedure to Select a Solution, pg. 12, select “USER”
mode.
b. With “USER” selected, press . If the display does not
show .00%/°C, hold long enough to bring the tempco to
.00%/°C (see Fig. 3).
c. Press twice (3 times
if in TDS mode). Temperature
compensation is now disabled
(=0) for measurements in
USER mode.
3. User Programmable Conductivity to TDS Ratio
This feature allows you to select a custom conductivity to TDS conversion
ratio for USER mode measurements.
For example: The conversion ratio range is 0.20-7.99 (ie., if conductivity
is 100 µS and TDS is 75 ppm, you would adjust to 0.75) (ref. Conductivity
Conversion to TDS, pg. 32).
13
CAL
MCLR
CAL
MCLR
MR
MS
MR
CAL
MCLR
CAL
MCLR
Figure 3
COND
°C% /
User
Figure 2
COND
°C% /
User
(56 paginas)
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