VMRK

TVRK with control component ELAB TCU3

VMRK with control component ELAB TCU3

VMRK

For the measurement of volume flow rates in ducts with contaminated air

Plastic circular volume flow rate measuring devices for recording or monitoring the
volume flow rate

Manual volume flow rate measurement
Permanent volume flow rate measurement
Recording of measured values for other controllers or the air management system
Optional effective pressure transducer for the automatic recording of measured values, factory assembled and complete with wiring and tubing
Casing made of flame-resistant polypropylene (PPs)
Casing leakage according to EN 15727, class D

Optional equipment and accessories

With flanges on both ends
Lip seal
Static effective pressure transducer

Application

Application

Plastic circular volume flow rate measuring units for the manual or automatic measuring of volume flow rates
Suitable for contaminated air
Simplified commissioning, approval and maintenance
Suitable for permanent installation because of low differential pressure

Special features

High measurement accuracy, even in unfavourable upstream conditions
Effective pressure range of 5 – 260 Pa
Low differential pressure of only about 15 – 24 % of the measured effective pressure

Nominal sizes

125, 160, 200, 250, 315, 400

Description

Variants

VMRK: Volume flow rate measuring unit
VMRK-FL: Volume flow rate measuring unit with flanges on both ends

Parts and characteristics

Ready-to-commission unit which consists of the mechanical parts and optional effective pressure transducers
Averaging differential pressure sensor for volume flow rate measurement; can be removed for cleaning
Optional effective pressure transducers, factory assembled and wired
High measurement accuracy of volume flow rates (even with bend R = 1D).

Attachments

Effective pressure transducer for static pressure measurements

XTS Type GT-VM-DS3
BTS Type VRU-M1-M/B
ELAB: EASYLAB air management system

Accessories

Matching flanges for both ends, including seals

Construction features

Circular casing
Spigot suitable for ducts according to DIN 8077
Both spigots with same diameter
Connection points for tubes with 6 mm inside diameter
The optional matching flange comes complete with a suitable seal

Materials and surfaces

Casing and damper blade made of flame-resistant polypropylene (PPs)
Effective pressure sensor made of polypropylene (PP)
Damper blade seal made of chloroprene rubber (CR)

Standards and guidelines

Fulfils the hygiene requirements of

EN 16798, Part 3
VDI 6022, Sheet 1
DIN 1946, Part 4
Further standards, guidelines in accordance with hygiene certificate

Casing leakage

EN 1751, Class D

Closed damper blade air leakage

EN 1751, Class 3
Meets the general requirements of DIN 1946, part 4, with regard to the acceptable closed damper blade air leakage

Maintenance

Maintenance-free as construction and materials are not subject to wear
Zero point correction of the static effective pressure transducer should be carried out once per year for some control components (recommendation)

Technical information

Function, Technical data, Quick sizing, Specification text, Order code

1: Effective pressure sensor
2: Measuring transducer
3: Casing

The volume flow rate measuring unit is fitted with an effective pressure sensor for measuring the volume flow rate. The effective pressure is either measured and evaluated manually, or transformed into an electrical signal by a measuring transducer (effective pressure transducer).

NS	qv [l/s]	qv [m³/h]	K value [l/s]	K value [m³/h]	Δqv [±%]
125	20	70	8,6	31,0	10
125	138	499	8,6	31,0	6
160	34	122	15,1	54,0	10
160	243	876	15,1	54,0	5
200	55	196	24,3	87,5	10
200	391	1410	24,3	87,5	5
250	85	306	38,0	136,8	10
250	612	2205	38,0	136,8	5
315	139	500	62,0	223,2	10
315	999	3598	62,0	223,2	5
400	231	830	103,0	370,8	10
400	1660	5978	103,0	370,8	5

Order code for volume flow rate measuring unit (with optional VARYCONTROL attachment)

VMRK	–	FL	/	160	/	GK	/	XTS	/	0
\|		\|		\|		\|		\|		\|
1		2		3		4		5		6

1 TypeVMRK Plastic volume flow rate measuring unit 2 FlangeNo entry required: NoneFL Flanges on both ends 3 Nominal size [mm]125, 160, 200, 250, 315, 400 4 AccessoriesNo entry required: NoneGK Matching flanges for both ends, including seals 5 Attachments (differential pressure transducer)No entry required: NoneXTS static effective pressure transducer, analogue, displayBTS static effective pressure transmitter, analogue, and MP-Bus, Modbus RTU, BACnet MS/TP

6 Signal voltage rangeOnly required if attachment is selectedFor the actual value signal0 0 – 10 V DC2 2 – 10 V DC

Order example 1: VMRK-FL/315/GK/XTS/0

Duct connection	Flanges on both ends
Nominal size	315 mm
Accessories	Matching flange
Attachments (effective pressure transducer)	Static effective pressure transducer XTS
Actual value signal	0 – 10 V DC

,
Order code for volume flow rate measuring unit (with EASYLAB attachment for recording measured values)

VMRK

–

160

ELAB

–

UMZ

1 TypeVMRK Volume flow rate measuring unit, plastic 2 FlangeNo entry: NoneFL Flanges on both ends 3 Nominal size [mm]125160200250315400 4 AccessoriesNo entry: NoneGK Matching flanges both sides 5 Attachments (control components)ELAB EASYLAB TCU3 6 Equipment functionEC Extract air recording 7 Voltage range for the actual value signalE0 Voltage signal 0 – 10 V DCE2 Voltage signal 2 – 10 V DC 8 Expansion modulesOption 1: Power supplyNo entry: 24 V ACT EM-TRF for 230 V ACU EM-TRF-USV for 230 V AC, provides uninterruptible power supply (UPS) Option 2: Communication interfaceNo entry: None B EM-BAC-MOD-01 for BACnet MS/TPM EM-BAC-MOD-01 for Modbus RTUI EM-IP for BACnet/IP, Modbus/IP and web serverR EM-IP with real time clock Option 3: Automatic zero point correctionNo entry: NoneZ EM-AUTOZERO Solenoid valve for automatic zero point correction

Order example 1: VMRK/200/ELAB/EC/E2/TZ

Duct connection	Spigot
Nominal size	200 mm
Attachments	EASYLAB TCU3
Equipment function	Extract air controller
External volume flow rate setting	Voltage signal 2 – 10 V DC
Expansion module	With expansion module EM-TRF, transformer for 230 V AC supply with expansion module EM-AUTOZERO, solenoid valve for automatic zero point correction

Variants, Dimensions and weights, Product details

Volume flow rate measuring unit VMRK

Spigot

Spigot

With flanges to make detachable connections to the ductwork

Materials

Standard construction

Order code detail	Part	Material
–	Casing Effective pressure sensor	Plastic, polypropylene (PPs), flame resistant

Optional flange

Order code detail	Part	Material
FL	Flange	Plastic, polypropylene (PPs), flame resistant

Optional matching flange

Order code detail	Part	Material
GK	Sea Matching flange	Rubber, EPDM Plastic, polypropylene (PPs), flame resistant

Standard construction

Dimensions and weights of VMRK (standard)

NG	L	∅D	B₃	H₃	kg
125	394	125	195	145	0.8
160	394	160	230	180	1
200	394	200	270	270	1.4
250	394	250	320	270	2.4
315	394	315	385	335	4
400	394	400	470	420	5.8

Note:
Weights (~) apply only to VMRK without any attachments.
Note that an optional effective pressure transducer (attachment BTS, XTS or ELAB) may add to the weight.

Dimensions and weights of VMRK-FL

NG	L	∅D	∅D₁	∅D₂	B₃	H₃	D	n	kg
125	400	125	165	185	195	145	8	8	1.1
160	400	160	200	230	230	180	8	8	1.4
200	400	200	240	270	270	270	8	8	1.9
250	400	250	290	320	320	270	8	12	2.9
315	600	315	350	395	385	335	10	12	5
400	600	400	445	475	470	420	10	16	7

Note:
Weights (~) apply only to VMRK with flange and matching flange, but without any attachments.
Note that an optional effective pressure transducer (attachment BTS, XTS or ELAB) may add to the weight

Space required for commissioning and maintenance

Sufficient space must be kept clear near any attachments to allow for commissioning and maintenance. It may be necessary to provide sufficiently sized inspection access openings. Product illustrations do not show any installation situation details. If an attachment requires a certain installation orientation, this is specified on a sticker on the product.

Space required

Attachment	①	②	③
Effective pressure transducer: BTS, XTS	300	320	300
Effective pressure transducer: ELAB	350	350	400

Space required for cleaning the sensor tubes

Nominal size	①	②	③	④	⑤	⑥
125 – 200	100	100	D	–	–	–
250 – 400	100	160	D	100	160	D

D: Casing diameter

Schematic illustration of required installation space
Note:
Weights apply only to VMRK with flange and matching flange, but without any attachments. Note that an optional effective pressure transducer (attachment BTS, XTS or ELAB) may add to the weight.

Bend

A bend with a curvature radius of at least 1D – without an additional straight duct section upstream of the volume flow rate measuring unit – has only a negligible effect on the volume flow rate accuracy.

Volume flow rate calculation for air density 1.2 kg/m³

Volume flow rate calculation for other air densities

Calculation conditions

The volume flow rate is calculated based on the measured effective pressure
The effective pressure is measured using an electronic manometer or an inclined tube manometer
Air density ρ = 1.2 kg/m3

Given data

VMRK/160
Δpw = 100 Pa (manometer reading of effective pressure)
Volume flow rate qv in m³/h

Device data

K value from table: K = 54 m3/h (15.1 l/s)

Installation and commissioning

The installation orientation of ELAB must be as shown on the sticker
The installation orientation of XTS and BTS is not critical

Upstream conditions
The volume flow rate accuracy Δ_qv applies to a straight upstream section of the duct. Bends, junctions or a narrowing or widening of the duct cause turbulence that may affect measurement. Duct connections, e.g. branches off the main duct, must comply with EN 1505. Some installation situations require straight duct sections upstream.

Optional attachments for effective pressure transducers

Attachment	Actual value	Effective pressure transducer	Manufacturer
Effective pressure transducer, static
XTS	0 – 10 V or 2 – 10 V	integral	①
BTS	0 - 10 V or 2 - 10 V or MP bus or Modbus RTU or BACnet MS/TP	integral	②
ELAB	TROX plug and play communication system and 0 - 10 V or 2 - 10 V or with optional accessories: Modbus, BACnet, web server	integral	③

① TROX/Gruner, ② TROX/Belimo, ③ TROX

Downloads

product information

Product data sheet Type VMRK

VMRK_PD_2024_11_04_DE_en Product data sheet 11 MB pdf

certificates

Certificate Statement Type VMRK

Certificate Statement 130 KB pdf
Certificate concerning statistical leakage tests

LC_v2_2024_10_DE_en Certificate 650 KB pdf
Certificate concerning statistical leakage tests

LC_v1_2024_10_DE_en Certificate 660 KB pdf
Declaration of hygiene conformity VMRK

VMRK_HC_2024_05_DE_en Hygiene certificate 1,6 MB pdf
Non-CE Manufacturer's statement VMRK

VMRK_NotCE_2022_02_08_14_44_12_DE_en Certificate 1,6 MB pdf

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Nominal sizes	125 – 400 mm
Volume flow rate range	20 – 1660 l/s or 70 – 5978 m³/h
Maximum differential pressure	1000 Pa
Effective pressure range	Approx. 5 – 260 Pa*
Measurement accuracy	5 – 10 %
Operating temperature	10 to 50 °C

NG	L	∅D	B₃	H₃	kg
125	394	125	195	145	0.8
160	394	160	230	180	1
200	394	200	270	270	1.4
250	394	250	320	270	2.4
315	394	315	385	335	4
400	394	400	470	420	5.8

NG	L	∅D	∅D₁	∅D₂	B₃	H₃	D	n	kg
125	400	125	165	185	195	145	8	8	1.1
160	400	160	200	230	230	180	8	8	1.4
200	400	200	240	270	270	270	8	8	1.9
250	400	250	290	320	320	270	8	12	2.9
315	600	315	350	395	385	335	10	12	5
400	600	400	445	475	470	420	10	16	7

NG	L	∅D	B₃	H₃	kg
125	394	125	195	145	0.8
160	394	160	230	180	1
200	394	200	270	270	1.4
250	394	250	320	270	2.4
315	394	315	385	335	4
400	394	400	470	420	5.8

NG	L	∅D	∅D₁	∅D₂	B₃	H₃	D	n	kg
125	400	125	165	185	195	145	8	8	1.1
160	400	160	200	230	230	180	8	8	1.4
200	400	200	240	270	270	270	8	8	1.9
250	400	250	290	320	320	270	8	12	2.9
315	600	315	350	395	385	335	10	12	5
400	600	400	445	475	470	420	10	16	7

For the measurement of volume flow rates in ducts with contaminated air

Application

Description

Technical information

Function, Technical data, Quick sizing, Specification text, Order code

Variants, Dimensions and weights, Product details

Materials

Downloads

product information

Product data sheet Type VMRK

certificates

Certificate Statement Type VMRK

Certificate concerning statistical leakage tests

Certificate concerning statistical leakage tests

Declaration of hygiene conformity VMRK

Non-CE Manufacturer's statement VMRK

TROX Services

TECHNICALLY NECESSARY

STATISTICS AND WEBSITE ANALYSIS

CONVENIENCE AND PERSONALISATION

FOR THE BEST TROX EXPERIENCE

NG	L	∅D	B₃	H₃	kg
125	394	125	195	145	0.8
160	394	160	230	180	1
200	394	200	270	270	1.4
250	394	250	320	270	2.4
315	394	315	385	335	4
400	394	400	470	420	5.8

NG	L	∅D	∅D₁	∅D₂	B₃	H₃	D	n	kg
125	400	125	165	185	195	145	8	8	1.1
160	400	160	200	230	230	180	8	8	1.4
200	400	200	240	270	270	270	8	8	1.9
250	400	250	290	320	320	270	8	12	2.9
315	600	315	350	395	385	335	10	12	5
400	600	400	445	475	470	420	10	16	7