KROHNE DK 700 EN - Manual

4000666201
KROHNE 08/2009
Installation and
Miniature flowmeters
Operating Instructions
for analytical process DK 700
Installation
Ensure materials compatibility
The temperature of the product and the allowable operating
pressure must not exceed the specified maximum values
(see Technical Data).
The measuring section is also permitted to be filled with
flammable liquids, provided a potentially explosive
atmosphere is not permanently or for prolonged periods
present in the measuring tube.
The calculation of the pressurized parts is effected with
allowance for corrosion, erosion through abrasion or
cavitation.
Installation in the pipeline
The variable area flowmeter has to be installed vertically
(float measuring principle - flow direction from bottom to top).
Before installing the flowmeter, blow or flush out the pipeline
leading to the flowmeter.
Use connectors suitable for the flowmeter version. Align the
pipes axially with the bolt holes un the flowmeter without
incurring stresses.
If necessary, support the pipeline on both sides of the
flowmeter to prevent vibration from being transferred to the
flowmeter.
Panel mounting
(see Dimensions and Weights)
Prepare the panel recess as shown in the drawing.
Before installing, remove the clamp clip 1 and
Allen screw 2, 4mm Allen key, from the flowmeter.
Insert flowmeter into recess and align vertically.
Fasten the flowmeter with the clamp clip and Allen screw (4
mm Allen key).
Initial startup
Close needle valve at the flowmeter.
Open shutoff valves upstream and downstream of flowmeter.
Slowly open needle valve and set the desired flowrate.
Where liquids are involved, carefully vent the pipeline to
avoid water hammer that may cause breakage of the glass
cone.
On gas service, increase pressure slowly up to the operating
pressure. Make sure the float does not accelerate to the
upper stop (e.g. in conjunction with solenoid valves) as this
may damage the flowmeter.
The flowrate value is read off from the top edge of the float
(ball).
Reading line
Technical Data
Measuring ranges see Flow table
Accuracy to VDI/VDE Code 3513, Sh. 2 (q
G
= 50%)
DK 701 6%
DK 702 4%
Measuring cone
Type NG
50
Length 60mm (2.36")
Scale division flow units
Float shape ball
Operating data
Max. allowable op. pressure
4 bar
Max. product temperature 100°C
Connection
Standard G
1/8
Option tube connection 6 mm
Fitting dimension 75 mm
Diameter of needle valve
Flow ranges
< 5 l/h water, ≤ 100 l/h air
1,0 mm
> 5 l/h water, > 100 l/h air 2,5 mm
Materials
Measuring cone
Borosilicate glass
Float Stainless steel 1.4401, glass
Gaskets
Standard
FKM / PTFE
Option FFKM / PTFE
Valve spindle Stainless steel 1.4571 (316 Ti)
Mount
Rail Aluminium
anodized
Front plate Polycarbonat
Top and bottom blocks PVDF