Hach NA5600 sc Na+ Mode D'emploi page 9

Rinsing removes the reactivation solution, grab sample or calibration standard from the
measurement cell. The analyzer rinses the measurement cell with the sample from the next channel
to be measured until the measurement is stable.
1. Push menu, then select SETUP SYSTEM > CONFIGURE ANALYZER > RINSE > MAX RINSE
TIME.
2. Enter the maximum rinse time (10 to 100 minutes). The recommended setting is 45 minutes
(default).
4.5 Set the sample target pH (analyzer without cationic pump)
Note: This task only applies to analyzers without the optional cationic pump. Refer to Product overview in the
installation manual to identify the cationic pump.
Before the measurement, the analyzer increases the pH of the sample to between 10.7 and 11.4 with
a conditioning solution to prevent ion interference. The analyzer automatically adjusts the quantity of
the conditioning solution that is added to the sample to keep the sample pH constant.
Set the target sample pH as follows:
1. Push menu, then select SETUP SYSTEM > CONFIGURE ANALYZER > MEASUREMENT > PH
TARGET.
2. Set the target pH (10.7 to 11.4). The recommended setting is pH 11.2 (default).
4.6 Set the sample target pH (analyzer with cationic pump)
Note: This task only applies to analyzers with the optional cationic pump. Refer to Product overview in the
installation manual to identify the cationic pump.
Before the measurement, the analyzer increases the pH of the sample to between 11.2 and 11.4 with
a conditioning solution to prevent ion interference. Set the ratio of the conditioning solution, which is
added as a gas, and the sample for each channel (Tgas/Twater). The Tgas/Twater ratio is based on
the pH of the unconditioned sample.
Item to collect: Calibrated pH sensor to put into the middle chamber of the measurement cell (or a
pH test strip)
Set the Tgas/Twater ratio for each channel as follows:
1. Identify the pH of the sample for each channel before it goes into the analyzer.
2. Push menu, then select SETUP SYSTEM > CONFIGURE ANALYZER > MEASUREMENT >
TGAS/TWATER.
3. Select the channels one at a time (e.g., TGAS/TWATER1 = Channel 1). Enter the applicable
Tgas/Twater value from
4. Push home.
5. Let the analyzer operate for 1 hour to stabilize.
6. Identify if the conditioned sample pH is between 11.2 and 11.4 as follows:
a. Remove the sodium electrode from the middle chamber of the measurement cell. Put the
sodium electrode in deionized water to keep the electrode wet.
b. Put a calibrated pH sensor in the middle chamber of the measurement cell.
c. For each channel, record the pH of the sample while the measurement status bar shows on
the display.
d. If the pH of a sample(s) is not between 11.2 and 11.4, set the Tgas/Twater setting for the
channel to a higher (or lower) percentage as necessary. Then, after 1 hour of operation, do
step c again.
e. If the pH of a sample(s) is not between 11.2 and 11.4 when the Tgas/Twater is set to the
maximum value, refer to "PH TOO LOW" in the troubleshooting table of the maintenance
manual to identify the problem.
7. When the conditioned sample pH of each channel is between 11.2 and 11.4, install the sodium
electrode back in the middle chamber of the measurement cell.
Table 3 (default: 20%).
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