Kobold DON -2/4, Operating Instructions Manual

Page: 37 / 65

DON
DON K36/1222 page 37
Problem Possible cause Solution
Counter
values too
high
1. Disruption of the
output signal
1. Ground shielding of the signal cable
2. Re-lay the cable away from sources of high current
2. Air or gas pockets
1. Eliminate the source of the air or gas pocket
2. Install an upstream air separator
3. Pulsating flow
from the piston pump
1. Increase back-pressure to the pump
2. Install a quick-response one-way check valve
3. Install a pulsation damper between the pump and the counter
4. Recalibrate the counter on site, to compensate for pulsations
5. Replace the pump type for a pump allowing smooth supply
Counter
values are
too low
1. Damaged or worn
rotors
1. Check, repair, clear or replace rotors
2. Damaged or worn
measurement
chamber 1. Check measurement chamber for damage - repair as required
2. Check concentricity of the rotor shafts in the chamber
3. Disruption of the
output signal
1. Ground shielding of the signal cable
2. Re-lay the cable away from sources of high current
3. Check all electrical connections and wires for the presence of current.
No output
from
counter
1. Soiled rotors
1. Check whether the rounded teeth at the base of the chamber are
visible
2. Check for any obstructing foreign particles
3. Clear, repair or replace rotors
2. Counter incorrectly
mounted 1. See instructions for re-mounting the counter, focusing on the
positioning of rotors and magnets above all
3. No output from the
output board
1. Check screw terminal connections and soldering joints
2. Ensure the presence of DC voltage at +Vs and 0V/GND and that the
analytical electronics connected include a pull-up resistor when using
the reed switch
3. Replace output plate
No flow
signals
indicated
on the
analytical
device
1. Defective
analytical electronics
1. Check settings and parameter data in the set-up menu
2. Check screw terminal connections and the presence of electrical
current
3. Repair/replace analytical electronics