Dynamic differential pressure transducers
X XDynamic
TOC
4.2 –
differential pressure transducers testregistrierung
Differential pressure
transducers for volume flow
rate measuring units
Type: Dynamic differential pressure
transducers
4
For the dynamic measurement of effective and
differential pressures
Differential pressure transducers based on the dynamic measurement principle for
volume flow rate measuring units Type VMR or VME
Linear volume flow rate actual value 0 – 10 V DC or 2 – 10 V DC
Recording of measured values for the display of volume flow rates or
for the control of slave controllers
Any installation orientation
Parameters are factory set
04/2013 – DE/en
K5 – 4.2 – 1
Differential pressure transducers for volume flow rate measuring units
General information
Dynamic differential pressure transducers
Type
Page
Dynamic differential
pressure transducers
Description
Universal controller VRD3
4
Any attachments are
defined with the order
code of the volume flow
rate measuring unit
General information
Special information – B10
4.2 – 2
4.2 – 3
Basic information and nomenclature
4.3 – 1
Application
– Electronic volume flow controller Universal with
dynamic differential pressure transducer for
use with volume flow rate measuring units
– Parameters are factory set
– On-site adjusting is not required
Standard filtration in comfort air conditioning
systems allows for use of the transmitter in the
supply air without additional dust protection. Since
a partial volume flow is passed through the
differential pressure transducer in order to
measure the volume flow rate, please note:
– With heavy dust levels in the room, suitable
extract air filters must be provided.
– If the air is polluted with fluff or sticky particles,
or if it contains aggressive media, dynamic
pressure transducers cannot be used
For this application the Universal controller is only
used for measuring the differential pressure and
for transforming the measured value into a linear
voltage signal. Connections for setpoint value
signal and actuator are not relevant, and neither
are the corresponding technical data.
– Volume flow rate actual value is available as
linear voltage signal
Dynamic differential pressure transducers for volume flow rate measuring units
Order code detail
Attachment
Controller
Part number
Model
B10
Function
TOC
M546GA4
Functional description
The volume flow rate is determined by measuring
the effective pressure. For this reason the
measuring unit is fitted with an effective pressure
sensor.
The integral differental pressure transducer
transforms the effective pressure into a voltage
signal. The volume flow rate actual value is hence
available as a voltage signal.
Volume flow rate measuring
unit
Type
VRD3
VMR, VME
The factory setting is such that 10 V DC always
corresponds to the nominal volume flow rate (nom).
Voltage ranges are factory stored in the controller.
Changes on the customer's site can easily be
carried out using an adjustment device or a
notebook with service tool.
Principle of operation – dynamic differential
pressure transducer
‫ݑ‬
+
-
‫ݢ‬
‫ݤ‬
‫ݣ‬
① Differential pressure transducer
② Volume flow controller
③ Actual value signal
K5 – 4.2 – 2
04/2013 – DE/en
Differential pressure transducers for volume flow rate measuring units
TOC
Special information – B10 Dynamic differential pressure transducers
Order code detail
Application
– Electronic volume flow controller VRD3 with
dynamic differential pressure transducer for
use with volume flow rate measuring units
– Differential pressure transducer and controller
electronics are fitted together in one casing
Technical data
Volume flow controller VRD3
Description
/ B10
Supply voltage (AC)
24 V DC −10/+20 %
Power rating (AC)
without actuator max. 3.5 VA
Power rating (DC)
without actuator max. 2 W
0 – 10 V DC, Ra > 100 kΩ
Setpoint value signal input
Actual value signal output
0 – 10 V DC, max. 0.5 mA
IEC protection class
III (protective extra-low voltage)
Protection level
IP 40
EC conformity
Function
Signal voltage range
– 0: 0 – 10 V DC
– 2: 2 – 10 V DC
24 V AC ± 20 %, 50/60 Hz
Supply voltage (DC)
Universal controller VRD3
Useful additions
– AT-VAV-B: Adjustment device
EMC according to 2004/108/EG
Weight
0.44 kg
VRD3
4
‫ݢ‬
‫ݪ‬
‫ݩ‬
‫ݣ‬
‫ݤ‬
‫ݥ‬
‫ݨ‬
‫ݦ‬
‫ݧ‬
① Controller VRD3
② max potentiometer
③ min potentiometer
④ Service socket
⑤ Jumper for input w
⑥ Actuator cable
⑦ Cable bushings for supply voltage, setpoint value
signal and actual value signal
⑧ Indicator light
⑨ Connections for differential pressure sensor
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K5 – 4.2 – 3
Differential pressure transducers for volume flow rate measuring units
Special information – B10 Dynamic differential pressure transducers
Characteristics
Characteristic of the actual value signal
Setting range
Volume flow
‫ݑ‬nom (100%)
‫ݢ‬
‫ݣ‬
‫ݑ‬min unit
0
10 V DC
2
① 0 – 10 V DC
② 2 – 10 V DC
Actual value signal U5
0 – 10 V DC
2 – 10 V DC
‫ݑ‬actual = U5 ‫ݑ‬nom
10
4
Electrical connection
‫ݑ‬actual = U5 ̋ 2 ‫ݑ‬nom
8
Terminal connections
1
͛
̋
2
~
+
3
w
4 5 6
PP U5 z1
7
z2
Universal
‫ݢ‬
‫ݣ‬
① Plug connection for actuator
② Plug connection for adjustment device
1 ⊥, –:
Ground, neutral
2 ~, +:
Supply voltage
3 w:
Setpoint value signal
4 PP:
Connection for adjustment device
5 U5:
Actual value signal
6 z1:
Override control 1 (OPEN)
7 z2:
Override control 2 (CLOSE, min, max)
Universal: VRD3
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04/2013 – DE/en
TOC
TOC
4.3 –
X XBasic
information and nomenclature
testregistrierung
Basic information and
nomenclature
4
Volume flow rate measurement
Product selection
Principal dimensions
Nomenclature
Sizing and sizing example
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K5 – 4.3 – 1
Volume flow rate measurement
TOC
Basic information and nomenclature
Product selection
Type
VMR
VME
VMRK
VMLK
Supply air
Ѐ
Ѐ
Ѐ
Ѐ
Extract air
Ѐ
Ѐ
Ѐ
Ѐ
Ѐ
Ѐ
Type of system
Duct connection
Circular
Ѐ
Rectangular
Ѐ
Volume flow rate range
Up to [m³/h]
6050
36360
6050
1300
Up to [l/s]
1680
10100
1680
360
Filtered
Ѐ
Ѐ
Ѐ
Ѐ
Office extract air
Ѐ
Ѐ
Ѐ
Ѐ
Polluted
Ͽ
Ͽ
Ѐ
Ѐ
Contaminated
Ͽ
Ͽ
Ѐ
Ѐ
Air quality
Volume flow rate measurement
Manual
Ѐ
Ѐ
Ѐ
Automatic
Ͽ
Ͽ
Ͽ
Ѐ
Ѐ
Ѐ
Ѐ
Ѐ
Special areas
4
Laboratories, clean rooms,
operation theatres
(EASYLAB, TCU-LON II)
Ѐ
Ͽ
K5 – 4.3 – 2
Possible
Possible under certain conditions: Robust unit variant
and/or specific differential pressure transducer
Not possible
04/2013 – DE/en
Volume flow rate measurement
TOC
Basic information and nomenclature
Principal dimensions
Nomenclature
04/2013 – DE/en
ØD [mm]
VAV terminal units made of stainless steel:
Outside diameter of the connecting spigot
VAV terminal units made of plastic: Inside
diameter of the connecting spigot
B₂ [mm]
Outside dimension of air duct profile (width)
ØD₁ [mm]
Pitch circle diameter of flanges
H [mm]
Duct height
ØD₂ [mm]
Outside diameter of flanges
H₁ [mm]
Screw hole pitch of air duct profile (vertical)
ØD₄ [mm]
Inside diameter of the flange screw holes
H₂ [mm]
Outside dimension of air duct profile (height)
L [mm]
Length of unit including spigot
H₃ [mm]
Unit height
L₁[mm]
Length of casing or acoustic cladding
n[]
Number of flange screw holes
W [mm]
Width of the duct
T [mm]
Flange thickness
B₁ [mm]
Screw hole pitch of air duct profile (horizontal)
m [kg]
Weight including attachments for the automatic
differential pressure measurement
nom [m³/h] and [l/s]
Nominal volume flow rate (100 %)
K value [m³/h] and [l/s]
Unit-related constant
min [m³/h] and [l/s]
Volume flow rate
Δpw [Pa]
Effective pressure
Δ [± %]
Volume flow rate accuracy
Δpst [%]
Static differential pressure in relation to the
measured effective pressure
B₃ [mm]
Unit width
4
K5 – 4.3 – 3
Volume flow rate measurement
TOC
Basic information and nomenclature
Sizing with the help of
this catalogue
This catalogue provides convenient quick sizing
tables for volume flow rate measuring unit, based
on aerodynamic data.
Volume flow rate ranges are provided for all
nominal sizes.
Sizing example
Given data
max = 280 l/s (1010 m3/h)
Quick sizing
VMR/200
C = 25.5 l/s (92 m3/h)
∆pst = 19 %
∆pw = 121 Pa
∆pst = 23 Pa (121 Pa × 0.19)
Easy Product Finder
4
The Easy Product Finder
allows you to size
products using your
specific data.
You will find the Easy
Product Finder on our
website.
K5 – 4.3 – 4
04/2013 – DE/en