Hach AMTAX sc Mode D'emploi page 14

Maintenance
6.1.1.1 Cleaning interval
The cleaning interval is based on the hardness of the water in the sample (see
Note: The drain can block if the cleaning interval is too long for the hardness of the sample.
Water hardness
ppm as CaCO
3
≤ 270
≤ 360
≤ 450
≤ 540
≤ 630
>720
6.1.2 Replace the fan filter
The filter air pads must be cleaned or replaced regulary. Refer to
for more information.
The cooling fan must be stopped before completing any filter maintenance.
To stop the cooling fan:
1. From the MENU select SENSOR SETUP>AMTAX SC and press ENTER.
2. Select MAINTENANCE>TEST/MAINTENANCE>AIR FILTER PADS and press
3. Select START and press ENTER.
Important note: Open the instrument door to prevent overheating.
CAUTION
Avoid injury. Keep hands clear. Although the fan is stopped, work carefully to avoid
injury in case of failure.
To change the fan filter:
1. Open the analyzer enclosure and the analysis panel.
2. Press ENTER.
3. Change the air filter pads as described on the controller.
4. Remove the fan locking screw and slide the retaining strap to the top and remove
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Table 1Cleaning interval
in mMol/L
in °dH
(alkaline earth ions)
≤ 15 ≤ 2.685
≤ 20 ≤ 3.58
≤ 25 ≤ 4.475
≤ 30 ≤ 5.37
≤ 35 ≤ 6.265
> 35 > 6.265
ENTER.
The process is started and the cooling fan stops.
The instrument counts the remaining time in seconds down to zero and goes to
MAINTENANCE MODE.
(Figure 10 on page 20). If necessary, press the fan down to remove the retaining
strap.
Consumption of cleaning
Cleaning interval
solution (includes calibration)
in hours
(or more often)
24
12
8 (pre-set)
6
3
1
Table 1).
in mL/month
80
150
220
290
570
1700
section 6.3 on page 16
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