Tecfluid COVOL Series - Manual (Page 8)

8
Before starting the installation, check that the cable gland is the right size for the cable to
be used. This will guarantee the instrument will stay watertight. The cable gland used is
for cables with outside diameters between 6 mm and 10 mm.
The electrical connection protector housing is dismounted by loosening the second nut.
When this is removed, the three connector terminals are visible.
The terminals are numbered 1 to 3 and the connection is as follows:
N. 1 & 2: Electrical switch connection.
N. 3: This terminal has a shortcircuit with terminal N.1. Don’t connect
anything to this terminal.
Before soldering the connections, unscrew the cable gland and feed it, together with the
electrical connection protector housing, over the cable.
The joint between the cable and the connector should always be soldered, and should be
tidy and without short circuits between terminals.
Peel the outside insulation to free the inner cables. It is recommended to tin the ends of
the wires to avoid loose ends.
Once the connections have been made, the housing should be mounted screwing it on
and then the cable gland should be tightened to avoid entry of any liquid or humidity.
Once assembled the half of the connector, the mounting in the base has only one position
defined by the keyway between the two parts.
Check that the rubber seal is in its position inside the connector base. If this is the case,
introduce the connector half in the base, positioning by the keyway, and screw on the nut
until the end of the thread is reached.
4 MAINTENANCE
In normal working conditions the COVOL flowmeter has a long life. Normally it will not be
necessary to change any parts.
The life of the parts depends mainly on the abrasive characteristics of the product to be
measured and the flow rate.
The combination of these two factors, together with the construction material of the
flowmeter, makes it difficult to estimate the life of the device in good working conditions
If the maximum flow rate for each DN shown in the chart below is exceeded the life of the
pieces can be considerably reduced.
Flow ranges
DN
Flow scales
l/h water
Max. intermittent
l/h water
pulses / litre
approx.
10 / ¼" (H) 25-250 500 100
10 40-350 800 100
15 150-1500 2700 20
25 500-4500 9000 10
40 800-8500 15500 4
50 1500-16000 28000 2
80 3000-28000 50000 1
100 5000-60000 104000 0.2