Hach-Lange BUEHLER 3010 4010 4210 4410 Manual - Manual (Page 30)

Operation
Page 30 Manual BÜHLER BU4010ff
REMARK: The pinch valve (9) is in inoperative position always closed and will be opened 1x per
hour to avoid sticking of the silicon tube.
Replacement of dosing hose
The silicone hose (BM69301) is only pushed over the lip of the metering vessel. A hose clamp is not
required. Humidify the hose a little bit, fix it at one point and push it over the lip.
Remark:
Conductivity of the sample medium
There are two conductive level electrodes in the metering vessel. Their sensitivity can
be adjusted progressively in the service menu. The factory adjusts the electrodes to
tap water (this adjustment does not have to be changed under normal operating
conditions).
Please note that a wrong adjustment can lead to a flooding of the pneumatic system and to the
damage of component parts.
ATTENTION: Wrong operating conditions can lead to malfunctions or may even damage the
apparatus. No liability or claims under guarantee will be accepted in respect of any
damage arising from the non-observance of these operating instructions.
Troubleshooting – bypass sampling system
If a fault develops in your sampler, we can only provide prompt assistance if you give us the type and
serial number of the apparatus concerned. You will find these data on the type plate.
The more precise your description of the fault is, the better our fault diagnosis will be.
Symptom Possible cause Action
Level electrodes do not
react, system is flooded -Adjustment of conductivity is too
low
-Failure on the power board
-Defective cable connection
-Check adjustment in service
menu
-Exchange power board
-Check cable connection
Sampler does not
extract samples -Wrong programming
-System is leaking
-No flow
-Inlet hose clogged
-Level electrodes bridged
-Wrong setting of parameters in
the service menu -Check programming
-Check whether the silicone
hoses are tight
-Check whether there is water
-Remove clogging
-Clean the electrodes
-Check entered values and, if
necessary, reset them to factory-
set values by reinitialization
Metering vessel
overflowing (backflow) -Outlet hose is clogged or
squeezed
-Pinch valve does not open
completely
-Remove clogging
-Adjust position of pinch valve