© KROHNE 01/2005
7.02309.24.00
GR
All-metal
miniature flowmeters
DK 32/34
Subject to change without notice.
Electromagnetic flowmeters
Variable area flowmeters
Mass flowmeters
Ultrasonic flowmeters
Vortex flowmeters
Flow controllers
Level measuring instruments
Pressure and temperature
Heat metering
Communications technology
Switches, counters, displays and recorders
Engineering systems & solutions
All-metal
miniature flowmeters
DK 32/34
DK 32 and DK 34 variable-area flowmeters
are rugged all-metal flowmeters suitable for
a wide variety of applications.
Metal cone
Stainless steel block,
upper and lower
Mechanical
indicator
Calibrated to VDI
Code 3513
Fine adjusting valve
(DK 32 only)
DK 32 with horizontal connections and valve
Options
●
Valve in upper device block.
●
Max. two adjustable limit switches (K1/K2),
set limit values are indicated on the scale.
●
Connection of a differential-pressure regulator is possible.
DK 34 with vertical connections, without valve
Option
●
2
Max. two adjustable limit switches (K1/K2),
set limit values are indicated on the scale.
DK 32 / DK 34
The responsibility as to the suitability, intended use and corrosion-resistance of the materials used in
their construction rests solely with the purchaser.
Technical data
Accuracy class
4
to VDI/VDE Guideline 3513, Sh. 2
Scale division
in flow units
Max. allowable operating pressure PS
130 bar (1885 psig) (higher pressure levels on request)
Directive 97/23/EC of the Council of 29 April 1999 concerning transportable pressure equipment (Pressure Equipment Directive) is applied.
The max. allowable operating pressure PS is calculated for the max. allowable operating temperature TS.
Both limits (PS and TS) are indicated on the nameplate. As a rule, PS is equivalent to the nominal pressure of the connection.
Test pressure PT
The test pressure is calculated in accordance with the Pressure Equipment Directive (97/23/EC) and AD 2000-HP30 with due regard to the
maximum allowable operating pressure and the maximum operating temperature.
Degree of protection to EN 60529 / IEC 60529
IP 65
Process temperature
Max. process temperature TS, without contacts
– 80°C to +150°C (–112°F to +302°F)
Ambient temperature Tamb.
– 20°C to +70°C (–4°F to +158°F)
Version with contacts
Process temperature
Tamb < 40°C (< 104°F)
Tamb < 50°C (< 122°F)
Tamb < 60°C (< 140°F)
DK32/K, DK34/K
145°C
293°F
135°C
275°F
125°C
257°F
Other temperatures on request
Connections
1/4” NPT female thread
Standard
Adapters
Ermeto 6 or 8, Serto 6 or 8,
Dilo, Gyrolok, Swagelok, G 1/4
Materials
Top and bottom blocks, cone, upper plug
CrNi steel, 1.4404 / 316 L
Float
CrNi steel 1.4571, titanium
Valve
CrNi steel 1.4571
Plug gasket
Viton
Gasket for dosing unit
Viton and PTFE
Housing
die-cast aluminium
Limit switches
Type
SC 2-N0
Max. number
2
Electrical connection
right-angle plug, style to DIN 43650/ISO 4400,
with cable gland M12 x 1.5
Length of signalling cable
1.5m, permanently wired
Degree of protection to EN 60529/IEC 529
IP 65
DK 32 / DK 34
3
DK 32 / DK 34
Flow table
Reference conditions
Water at 20°C (68°F)
Air
at 20°C, 1.013 bar abs. (68°F, 14.7 psia)
100% Flow values, Turn-down ratio 10 : 1
Cone No.
Valve spindle
diameter
mm
inches
Ident No.
K 005
K7
K 010
K5
K 015
K9
K 040
K4
K 080
K1
K 125
K2
K 200
K3
K 300
K6
K 340
K8
* with titanium float
1.0
1.0
2.5
2.5
2.5
4.5
4.5
4.5
4.5
Water
0.059
0.059
0.059
0.126
0.126
0.126
0.126
0.126
0.177
Air
max. pressure loss
l/h
US GPM
l/h
SCFM
mbar
psig
–
–
0.013
0.022
0.044
0.110
0.176
0.264
0.352
0.440
50/16*
100
150
400
800
1250
2000
2500
3400
0.031
0.062
0.093
0.248
0.496
0.775
1.241
1.551
2.109
31
66
19
27
55
42
85
117
166
0.45
0.96
0.28
0.39
0.80
0.61
1.23
1.70
2.41
3
5
10
25
40
60
80
100
Dimensions and weights
55 (2.17”)
110 (4.33)
90 (3.54”)
125 (4.92”)
35
(1.38”)
25
(0.98”)
45 (1.77”)
42 (1.65”)
Weight DK 32 approx. 0.7 kg (1.5 lbs)
30
45
(1.18”)
(1.77”)
Weight DK 34 approx. 0.6 kg (1.3 lbs)
Dimensions DK with limit switches
Note
If several devices are installed
side by side, please observe given
lateral dimensions.
1500 (50.1”)
app. 90 (3.54”)
(3.54”)
(1.97”)
app. 90
46 (1.81”)
To be able to set the limit
contacts, cover screws must be
detachable.
app. 50
app. 44
(1.73”)
4
DK 32 / DK 34
DK 32 / DK 34
Needle valves for gases and liquids
Needle valves allow exact setting of the flow rate.
Valve stem
Max. flow rate Qv
Water
l/h
5
50
160
240
Ø mm
1.0
2.5
4.5
6.0
Max. flow rate Qv
Air
l/h
100
1000
4300
7000
Cv valve characteristic
m3/h
0.018
0.15
0.48
0.62
Valve characteristic
Air
l/h
Valve stem 1,0 mm
Water
Water
l/h
Air
l/h
Water
Air
Air
Stem turns n
Stem turns n
Air
l/h
Valve stem 4,5 mm
Water
Water
l/h
Air
l/h
Valve stem 6,0 mm
Water
l/h
Air
Water
Stem turns n
Water
l/h
Valve stem 2,5 mm
Air
Stem turns n
DK 32 / DK 34
5
DK 32 / DK 34
Range of application
Differential pressure regulators
Differential pressure regulators are used to maintain constant flow rates Inlet pressure regulators, type RE, NRE
Types RE and NRE maintain a constant flow rate for gases and liquids
at varying inlet or outlet pressures.
at variable inlet pressures and constant outlet pressures.
● Minimum pressure levels are required for operation of the regulators
Example: inlet pressure regulator RE 1000:
(see regulator characteristics)
Current flow rate: 1000 Nl air
● Differential pressure regulators are not pressuring reducing valves
Outlet pressure constant: 1.013 bar abs.
At a variable inlet pressure greater than 0.5 bar, the flow rate in the
● Maximum flow rate: 3400 I/h (2.11 SCFM) air
device remains constant.
100 I/h (0.44 US GPM) water.
●
Connections:
standard: 1/4" NPT
special version: Serto 6 or 8, tube grommets 6 or 8 mm,
Ermeto 6 or 8, Dilo, Gyrolok, Swagelok
●
Max. allowable operating pressure at 20°C (68°F):
CrNi steel 1.4404 max. 64 bar (928 psig)
●
Temperatures up to max. 80°C (176°F)
Outlet pressure regulators, type RA, NRA
On gas service, types RA and NRA maintain a constant flow rate at
variable outlet pressures and constant inlet pressures.
There must be a minimum pressure difference between inlet and outlet
pressure in order for the outlet pressure regulator to function.
Example: outlet pressure regulator NRA 800:
current flow rate: 800 Nl air
inlet pressure constant: 3 bar
At a variable outlet pressure of 0 … 2.9 bar, the flow rate in the device
remains constant.
Differential pressure regulators
Type
Inlet pressure regulator
RE-1000
RE-4300
NRE-100
NRE-800
Max. flow rate
Water *
l/h
US GPM
40
0.18
100
0.44
2.5
0.011
25
0.11
Air *
l/h
1000
3400
100
800
Min. required inlet pressure p1
bar
psig
0.5
7.25
1-2
14.5 - 29.0
0.1
1.45
0.2 - 0.4
2.9 - 5.8
SCFM
0.62
2.11
0.062
0.50
Min. pressure difference ∆p (inlet/outlet pressure)
0.5
7.25
2.0
29.0
0.4
5.80
Outlet pressure regulator
RA-1000
40
0.18
1000
0.62
RA-4300
100
0.44
3400
2.11
NRA-800
25
0.11
800
0.50
* Reference conditions: air 20°C (68°F), 1.013 bar abs. (14.7 psia)
water 20°C (68°F)
Material:
CrNi steel 1.4404
Regulator characteristics
Inlet pressure regulator types RE and NRE
l/h
(SCFM)
l/h
(SCFM)
5000
(3.1)
4000
(2.48)
4000
(2.48)
qv
qv
3000
(1.86)
3000
(1.86)
2000
(1.24)
2000
(1.24)
1000
(0.62)
1000
(0.62)
0
1
(14.50)
2
(29.01)
3
(43.51)
4
(58.02)
5
(72.52)
6
(87.00)
p1 = inlet pressure in bar (psig)
Qv = Current flow rate
6
5000
(3.1)
DK 32 / DK 34
0
1
(14.50)
2
(29.01)
3
(43.51)
4
(58.02)
5
(72.52)
p2 = outlet pressure in bar (psig)
6
(87.00)
DK 32 / DK 34
app. 163 (6.42”)
Dimensions, differential pressure regulators
Inlet pressure regulator RE, NRE
(2.76”)
(0.75”)
(0.59”)
(0.59”)
1/4” NPT
70
(RE, NRE, RA, NRA)
Inlet always at bottom
app.
15
19
1/4” NPT
app.
15
90 (3.54”)
Limit switches
Limit switch SC 2-NO is a slot sensor with built in preamplifier. The sensor is actuated by the dipping action of the pointer vane. The limit switches
can be set over the entire measuring range. The set limit values are indicated on the scale. For hazardous-duty systems, SC 2-NO contacts are
connected to isolation switching amplifiers.
Isolation switching amplifier NAMUR
KFA6-SR2-Ex1.W
KFA5-SR2-Ex1.W
KFD2-SR2-Ex1.W
KFA6-SR2-Ex2.W
KFA5-SR2-Ex2.W
KFD2-SR2-Ex2.W
Power supply
230 V AC
115 V AC
24 V DC
230 V AC
115 V AC
24 V DC
Technical data, SC 2-NO
Nominal voltage
Current consumption, active area clear
active area obscured
8 V DC
3 mA
1 mA
For use in hazardous aeas, note that connection of the limit switch to
the intrinsically safe circuits must be made with following maximum
values
Version DK3./....././....-EEx
No-load voltage Ui
Short-circuit current Ii
Power Pi
16 V
52 mA
169 mW
Channel
1
1
1
2
2
2
Version DK3./....././..../ A - EEx
No-load voltage Ui
Short-circuit current Ii
Power Pi
Order No.
5015262000
5015262100
5015262200
5015262300
5015262400
5015262500
16 V
25 mA
64 mW
Independent of the built-in variant, the following maximum values
apply:
Self-inductance (Li)
150 µH
Self-capacitance (Ci)
150 nF
General approval DK3./....././..-EEx:
Approval SC......:
PTB 99 ATEX 2191
PTB 99 ATEX 2219 X
DK 32 / DK 34
7