WIKA DELTA-plus Mode D'emploi page 19

6. Commissioning, operation
Measuring assemblies
The preferred measuring assemblies for various possible applications are
specified in DIN 19216.
The following schematic diagram shows a recommended assembly for liquid
media. As throttling devices, differential pressure transducers should be provided
in accordance with DIN 1952 (issue 07.82), now replaced by EN 5167/1.
The differential pressure lines must be made from metal, their bore must not
be less than 4 mm and the effective length between the valve manifold and the
differential pressure gauge must be at least 500 mm.
In addition, the length and the bore of
the pressure lines should be such that,
with cold lines, the response time of
the pressure gauge is not more than
5 seconds.
The connections of the differential
pressure lines must be welded, brazed or
screwed using metal sealing elements.
Shut-off valves in differential pressure
lines must only be operated using tools.
6.2 Electrical connection
(applies to models DELTA-comb and DELTA-switch)
The electrical connection must only be made by qualified skilled personnel.
■
Connection details and switching functions are given on the product label.
■
Connection terminals and ground terminal are appropriately marked.
The mains connection lines to be provided must be dimensioned for maximum
■
instrument current supply and comply with IEC 227 or IEC 245.
The instruments must be connected to the equipotential bonding of the plant.
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Performance data (see 3 "Specifications")
WIKA operating instructions DELTA-plus, DELTA-comb and DELTA-switch
Differential pressure
transducer
(throttling device in the
process line)
Differential pressure
line
Shut-off valves
(valve manifold)
Differential pressure
instrument
(DELTA-plus,
DELTA-comb or
DELTA-switch)
EN
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