37
36
mS
SETUP
µ
S
ppt
ppm
SETUP
ppt
ppm
SETUP
ppt
ppm
P7.4 Setting the TDS factor
The concentration of salts dissolved in solution increases the conductivity of that
solution. This relationship varies from salt to salt and is roughly linear over a given
range for a given salt. The TDS conversion factor is the number used by the meter to
convert from conductivity to TDS.
To determine the conductivity to TDS conversion factor for your solution:
• Appendix 1 on page 48 lists some commonly used conversion factors.
• Appendix 2 on page 49 describes how to calculate the TDS conversion factor for
other solutions.
You can set the TDS conversion factor between 0.4 and 1.0; meter default is 0.5.
From measurement mode
1.
Press the Mode key
to select
conductivity or TDS measurement mode.
2.
Press Setup key
to enter Set Up mode.
3.
Press the
▲
and
▼
keys
to scroll through
subgroups until you view parameter P7.0.
See figure
4.
Press the ENTER key
five times to select
parameter 7.4. The upper display shows
“tdS” and the lower display shows
“P7.4”.
See figure
5.
Press the ENTER key again
. The upper
display shows a value and the lower
display shows “tdS”.
See figure
6.
Calculate the TDS factor of your
solution.
See Appendix 2 on page 49
for information on how to calculate the
TDS factor.
7.
Press the
▲
and
▼
keys
to select your
calculated TDS conversion factor.
8.
Press the ENTER key
to confirm
selection and to return to the subgroup
menu. Press the CAL/MEAS key to
return to measurement mode.
H
H
I
I
J
J
mS
SETUP
µ
S
ppt
ppm
ATC
SETUP
C
ATC
SETUP
C
ATC
SETUP
C
P7.3 Selecting Automatic or Manual Temperature Compensation
This feature lets you select between Automatic Temperature Compensation (ATC)
and Manual Temperature Compensation for conductivity (it lets you deactivate the
temperature sensor in the conductivity/TDS probe). Meter default is ATC.
From measurement mode
1.
Press the Mode key
to select
conductivity or TDS measurement mode.
2.
Press Setup key
to enter Set Up mode.
3.
Press the
▲
and
▼
keys
to scroll through
subgroups until you view parameter P7.0.
See figure
4.
Press the ENTER key
three times to
select parameter 7.3. The upper display
shows “ATC” and the lower display
shows “P7.3”.
See figure
5.
Press the ENTER key again.
The upper
display shows “ATC” and the lower
display shows “YES” or “NO”.
See figure
6.
Press the
▲
and
▼
keys
to select the
Automatic Temperature Compensation on
of off.
• YES = ATC on
• NO = ATC off (manual compensation)
7.
Press the ENTER key
to confirm selection
and to proceed to step 4 of P7.4. menu.
Press the CAL/MEAS key twice to return
to measurement mode.
E
E
F
F
G
G
