KROHNE DK700 User Manual
4000666201
KROHNE 08/2009
Installation and
Miniature flowmeters Operating Instructions
for analytical process DK 700
Installation
Initial startup
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).
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
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
= 50%)
G
Dimensions and weights
Dimensions
a b c d e f
mm inches mm inches mm inches mm inches mm inches mm inches kg lbs
97 3.82 25 0.99 75 2.95 max. 65 max.2.56 94 3.70 23 0.91 0.1 0.22
Float material stainless steel 1.4571 (316 Ti), glass
Calibration data: Water at 20°C (68°F)
Air at 20°C, (68°F), 1.2 bar abs. (17.4 psig) (in normal state)
100% flow values
Rangeability 10 : 1
Ball Ø
mm inches l/h SCFH l/h SCFH l/h US GPM
4
4
4
4
4
4
6
6
6
6
Panel recess
Flow table
Air Water
DK 701 (Scale on frontplate) DK 702 Scale on glass cone) DK 702 (Scale on glass cone)
0.16
0.16
0.16
0.16
0.16
0.16
0.24
0.24
0.24
0.24
-
-
-
-
40
100
150
250
-
-
-
-
-
-
1.5
4
6
10
5
8
16
25
40
60
100
250
500
800
0.2
0.3
0.6
1
1.5
2.5
4
10
20
30
-
-
-
-
-
2.5
5
12
25
40
approx. Weight
-
-
-
-
-
0.01
0.02
0.05
0.1
0.16
Product liability and warranty
Responsibility for the suitability and usage to the intended purpose of these flowmeters rests solely with the operator. Improper installation or
improper operation of the flowmeters may lead to the loss of warranty. In addition, the "General conditions of sale" which forms the basis of the
purchase contract are applicable.
If you need to return the unit for checkout or repair, please pay strict attention to the following points:
Due to statutory regulations concerning protection of the environment and the health and safety of our personnel, KROHNE may only handle, test
and repair returned flowmeters that have been in contact with liquids if it is possible to do so without risk to personnel and environment.
This means that KROHNE can only service your unit if it is accompanied by a certificate confirming that the flowmeter is safe to handle.
If the unit has been operated with toxic, caustic, flammable or water-endangering liquids, you are kindly requested:
● To check and ensure, if necessary by rinsing or neutralizing, that all the cavities are free from such dangerous substances.
● To enclose a certificate with the flowmeter confirming that is safe to handle and stating the liquid used.
KROHNE regret that we cannot service your device unless it is accompanied by such a certificate and thank you for your understanding.
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