Hach-Lange HQD - Conductivity probe CDC - Manual (Page 7)

DOC272.53.80022 7
1. Make sure a probe is connected to the meter.
2. Push the METER OPTIONS key and select (CDC401) Settings.
3. Select Modify Current Settings.
4. Select Parameter to change the parameter that is shown in the display. Select
Measurement Options.
5. Update the settings. Refer to Table 3 .
Table 2 CDC401 default methods
Setting Options Description
Current Method
Hach Conductivity
Default method with conductivity measurement values.
Conductivity is typically used for natural water samples.
Hach TDS
Default method with TDS measurement values. TDS is typically
used to estimate the amount of total dissolved solids in the
sample. Conductivity value will also be displayed in Detailed
Reading screen
Hach Salinity
Default method with Salinity measurement values. Salinity is
typically used for samples with a high salt content such as sea
water. Conductivity value will also be displayed in Detailed
Reading screen.
Hach resistivity
Default method with Resistivity measurement values. Resistivity
is typically used for ultra pure water applications.
Default —
Table 3 Measurement option settings
Setting Options Description
Units—conductivity
Auto (default)
µS/cm
mS/cm
When auto is selected, the units will automatically change to
mS/cm when the sample conductivity is high and µS/cm when
the conductivity is low. Select µS/cm or mS/cm to always
show the same units.
Units—salinity
‰ (default)
g/kg
<unitless>
ppt (parts per thousand)
Select one of the units for salinity.
Measurement limits
Lower limit (default: 0.01
µS/cm; 0 ‰)
Upper limit (default:
400000.00 µS/cm; 42 ‰)
The measurement limits can be set to match the acceptable
values for the sample. When the measurement is above the
upper limit setting or below the lower limit setting, the meter
will show an "Out of limits" message.This message is an alert
to a potential problem with process conditions.
Temperature correction
None
Linear
NaCl—non-linear (default)
Natural water The conductivity of the sample will change when the
temperature changes. Temperature correction will show the
conductivity at the user-selected reference temperature.
Temperature correction can be changed or turned off when
the parameter is set to conductivity, TDS or resistivity.