HACH LANGE Filtrax, User Manual

Page: 41 / 59

Operation
39
5.6 [+SERVICE] menu
Important Note: All maintenance and service work apart from pure visual inspection must
be performed with the instrument in this menu!
When this menu is opened,
initially the message "OK - NO
SAMPLE!" appears to indicate
that on the activation of this
menu, sample feed to the
measuring instruments is
interrupted immediately!
Operation is only re-started
when this menu is actively left
using the keypad or a program
that is opened. If this menu is selected, then
• The pumps are stopped immediately
• The filter module venting is shut down
• The red signal lamp is illuminated
• The fault relay is set
• Only the temperature control and heater systems in the control unit and
the tubes remain active
The functions of the individual commands and sub-menus ([FILTERCLEANING],
[OP.COUNTERS], [+TEST OF FUNCT.]) are explained in detail in section 6
Maintenance and section 7 Faults, causes, rectification. They are not required for
normal operation.
MENU
Command
Setting
Description
+SERVICE
INTERVAL
30...300 s (default setting 60 s)
Changeover interval for sample pumping between module A
and B
EXTRACTION
50...130% (default setting 100% = 900 ml/h -
this sample volume is produced on correct
installation under normal operating conditions
with clean filter modules)
The volume pumped by the pumps is adjusted via the speed of
the pumps
PREPUMP
For filling all tubes both pumps are operated simultaneously for
10 min.
The venting of the filter modules remains active - operation is
then re-started automatically
FILTERCLEANING
Menu-based cleaning of the filter modules, detailed description
in sec. 7.2 Maintenance - after each clean the date of the
operating counter [CLEANED] is automatically updated and
operation re-started
PHOTOMETER
ON/OFF
Flow rate measurement can be switched on and off