KNF N 143 AV.12 E - Page 26

Troubleshooting Diaphragm Pumps N 143/186.12
26 Translation of original Operating and Installation Instructions, english, KNF 121610-121613 07/16
Flow rate, pressure or vacuum too low
The pump does not achieve the output specified in the Technical data or the data sheet.
Cause
Fault remedy
Leaks occur on connections,
lines or pump head.
 Eliminate leaks.
Connections or lines completely
or partially jammed.
 Check connections and lines.
 Remove the jamming parts and particles.
Head parts are soiled.
 Clean head components.
Working diaphragm or valve
plate is worn.
 Replace working diaphragm, safety diaphragm and valve
plate(see chapter 8.3).
Tab. 17
Fault cannot be rectified
If you are unable to determine any of the specified causes, send
the pump to KNF Customer Service (see last page for the ad-
dress).
1. Flush the pump under atmospheric conditions some minutes
with air (if necessary for safety reasons: with an inert gas) to
free the pump head of dangerous or aggressive gases (see
chapter 8.2.1).
2. Clean the pump (see chapter 8.2.2).
3. Send the pump, together with completed Health and Safety
Clearance and Decontamination Form (Chapter 12), to KNF
stating the nature of the transferred medium.