WIKA SERIES DW User Manual

INSTRUCTION MANUAL
NI-209WE
Rev. 8 12/16
7 of 9
15. TROUBLESHOOTING
IMPORTANT NOTE: operations involving replacement of essential components must be carried out at our workshop, especially for
instruments with flameproof certificate; this is to guarantee the user the total and correct restoration of the product original characteristics.
MALFUNCTION
PROBABLE CAUSE
REMEDY
Set point shift
 Air bubbles in the connection lines (condensation in
the case of use of gas; excluding versions DW10
and DA10)
 Solid particles deposited inside the measurement
chambers of the instrument (excluding versions
DW10 and DA10)
 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.
 Leakage of filling fluid (excluding versions DW10
and DA10).
 Drain using the appropriate plugs
 Dismount the measurement chambers and clean
them (during the mounting phase the screw locking
couple is 80 N/m)
 Recalibrate or replace the sensitive element.
 Recalibrate or replace the sensitive element with
another made of a suitable material. If necessary
apply a fluid separator
 Send to the constructor for checking
Slow response
 Clogged or obstructed connection line.
 Root or service valve partially closed.
 Too viscous fluid.
 Check and clean line.
 Open valve.
 Provide instrument with suitable fluid separator.
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.14 – DW-DA – Mounting
of the brackets for 2” pipe
Fig.15 – DW10-DA10- Mounting
of the brackets for 2” pipe
Fig. 16 - Example of mounting
Wall installation
Installation on 2” pipe

WIKA SERIES DW Specifications

General

Brand	WIKA
Model	SERIES DW
Category	Switch
Language	English