INSTRUCTION MANUAL
NI-210WE
Rev. 4 04/20
5 di 6
10 PUTTING INTO OPERATION
The instrument comes into operation as soon as the root valves
are opened and then, afterwards, the service valve attached to
the inst (H) inlet pipe is opened, the by-pass valve
closed and the service valve attached to the instrument – (L) inlet
pipe is opened. Any possible drainage of the connection tubing
can be carried out by opening the drains positioned on valves.
Do not dispose of the process fluid into the environment, if this
can cause pollution or damage to people
11 VISUAL
INSPECTION
Periodically check the external condition of the enclosure. There
should be no trace of leakage of process fluid outside the
instrument.
In case of intrinsic safety instruments, inspections of the electrical
installation are to be carried out also according to customer
procedures and at least in accordance with IEC-60079-17.
The intrinsic safety instruments installed in explosive
atmospheres for the combustible dust presence, must be
periodically cleaned up externally in order to avoid dust
accumulating.
12 FUNCTIONAL
VERIFICATION
This will be carried out according to the Customer’s control
procedures and because of their particular operating principle,
have to be functional inspected every year as minimum if used
as an alarm of max pressure
The instruments can be verified on the plant if installed as
illustrated in Fig. 14.
To avoid any risk it is recommended check the set point on site
without open the cover, without dismount the cable gland and
without unplugging the power cable.
The intrinsic safety instruments may be checked on site only if
the apparatus used are suitable for explosive atmosphere.
If this is not the case it is necessary remove the instrument from
the plant, and carry out the verification in a testing room.
If the verification of the set point is performed unplugging the
power cable from the terminal block it is recommended de-
energize the instrument to avoid any electrical hazard.
Verification consists in
check the calibration value
and possibly
regulating the adjustment bush (see §5).
13 STOPPING
AND
DISMOUNTING
Before proceeding with these operations
ensure
that the plant or
machines have been put into the
conditions
foreseen to allow
these operations.
With reference to Figures 14
Remove the power supply (signal) from the electrical line. Close
the root valves (6) and open the by-pass valve. Open the drains
on the root valves slowly.
Do not dispose of the process fluid into the environment, if this
can cause pollution or damage to people.
Unscrew the three-piece joint (1).
Unscrew the cable gland (9).
Remove the cover of the instrument and disconnect the electrical
cables from the terminal block and earth screws.
Remove the screws fixing the case to the panel and remove the
instrument, taking care to slide the electrical conductors out from
the case.
Mount instrument cover. Insulate and protect cables around, if
any. Temporarily plug pipes not connected to the instrument.
In case of intrinsic safety instruments it is recommended to follow
- at least – the standard IEC-60079-17 for the withdrawal from
service of electrical apparatus.
14 DISPOSAL
The instruments are mainly made of stainless steel and
aluminium and therefore, once the electrical parts have been
dismounted and the parts coming into contact with fluids which
could be harmful to people or the environment have been
properly dealt with, they can be scrapped.
15 TROUBLESHOOTING
IMPORTANT NOTE
: operations involving replacement of essential components must be carried out at our workshop this is to guarantee
the user the total and correct restoration of the product original characteristics.
MALFUNCTION PROBABLE
CAUSE
REMEDY
Set point shift
Permanent deformation of the sensitive element
due to fatigue or non-tolerated over-ranges
Variation of the elastic features of the sensitive
element due to its chemical corrosion.
Recalibrate or replace the sensitive element.
Recalibrate or replace the sensitive element with
another made of a suitable material.
Slow response
Clogged or obstructed connection line.
Root or service valve partially closed.
Check and clean line.
Open valve.
No actuation or
undue actuation
Root or service valve closed.
By-pass valve open.
Microswitch contacts damaged.
Loosened electrical joints.
Interrupted or short-circuited electrical line.
Open the valve.
Close the valve.
Replace the microswitch.
Check all electrical joints.
Check the conditions of the electrical line.
Undue actuation
Accidental shocks or excessive mechanical
vibrations.
Modify the mounting.
Fig.10 – DW03 wall mounting
Fig.11 – DW03 wall mounting
