Hach-Lange AMTAX indoor sc - Manual (Page 46)

46
Maintenance
6.1.1.1 Cleaning interval
The cleaning interval (Refer to section 5.2, page 37 for more
information.) is based on the hardness of the water in the sample
(see
Table 4 ).
Note: The drain can block if the cleaning interval is too long for the
hardness of the sample.
6.1.2 Replace the fan filter
The filter air pads must be cleaned or replaced regulary. Refer to
section 6.3, page 48 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/MAINT>AIR FILTER PADS and
press ENTER.
3. Select START and press ENTER.
The process is started and the cooling fan stops.
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.
The instrument counts the remaining time in seconds down to
zero and goes to SERVICE STATE.
3. Change the air filter pads as described on the controller.
Table 4 Cleaning interval
Water hardness Cleaning interval
Consumption of cleaning
solution (includes calibration)
ppm as CaCO
3
in °dH
in mMol/L
(alkaline earth ions)
in hours
(or more often)
in mL/month
≤ 270 ≤ 15 ≤ 2.685 24 80
≤ 360 ≤ 20 ≤ 3.58 12 150
≤ 450 ≤ 25 ≤ 4.475 8 (pre-set) 220
≤ 540 ≤ 30 ≤ 5.37 6 290
≤ 630 ≤ 35 ≤ 6.265 3 570
>720 > 35 > 6.265 1 1700