Type VMR

For the measurement of volume flow rates in ducts

Circular volume flow rate measuring units for the recording or monitoring of volume flow rates

Manual volume flow rate measuring
Permanent volume flow rate measuring
Recording of measured values for other controllers or for the LABCONTROL air management system
Pressure transducer for the automatic recording of measured values, factory assembled and complete with wiring and tubing
Casing air leakage to EN 15727, class C

Optional equipment and accessories

With flanges on both ends
Lip seal
Dynamic or static differential pressure transducers

Volume flow rate measuring unit, variant VMR/.../BB0 00181176_0

Tested to VDI 6022

Application

Circular volume flow rate measuring units Type VMR for the manual recording or automatic measuring of volume flow rates
Simplified commissioning, approval and maintenance
Suitable for permanent installation because of low differential pressure
Optional static differential pressure transducer for systems with polluted air

Special characteristics

Measurement accuracy ± 5 %
Low differential pressure of only about 10 – 26 % of the measured effective pressure

Nominal sizes

100, 125, 160, 200, 250, 315, 400

Variants

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

Construction

Galvanised sheet steel
P1: Powder-coated, silver grey (RAL 7001)
A2: Stainless steel

Parts and characteristics

Ready-to-commission unit which consists of the mechanical parts and an optional pressure transducer
Averaging differential pressure sensor for volume flow rate measurement
Optional factory-assembled pressure transducers complete with wiring and tubing
High measurement accuracy (even with upstream bend R = 1D).

Attachments

Dynamic differential pressure transducer
Static differential pressure transducer
LABCONTROL: Components for air management systems

Accessories

Lip seals on both ends (factory fitted)
Matching flanges for both ends

Construction features

Circular casing
Spigot suitable for circular ducts to EN 1506 or EN 13180
Spigot with groove for lip seal
Connecting nipple for tubes with 6 mm inside diameter
VMR-FL: Circular flanges to EN 12220

Materials and surfaces

Galvanised sheet steel construction

Casing made of galvanised sheet steel
Aluminium sensor tubes

Powder-coated construction (P1)

Casing made of galvanised sheet steel, powder-coated
Sensor tubes made of aluminium, powder-coated

Stainless steel construction (A2)

Casing made of stainless steel 1.4301
Sensor tubes made of aluminium, powder-coated

Standards and guidelines

Hygiene conforms to VDI 6022
Casing air leakage to EN 15727, class C

Maintenance

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

Technical information

Function, Technical data, Specification text, Order code, Produktbeziehungen

Functional description

The 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 electric signal by a pressure transducer.

Nominal sizes	100 – 400 mm
Volume flow rate range	10 – 1680 l/s or 36 – 6048 m³/h
Measurement accuracy	± 5 % of the measured value
Effective pressure range	approx. 5 – 250 Pa
Measuring unit differential pressure (pressure loss)	10 – 26 % of the measured effective pressure
Operating temperature	10 – 50 °C

Circular volume flow rate measuring unit for the measurement of volume flow rates in air conditioning systems, available in 7 nominal sizes.

For the manual volume flow rate measuring or for the permanent monitoring of the actual value signal.

Ready-to-commission unit which consists of the casing with an averaging differential pressure sensor.

Differential pressure sensor with 3 mm measuring holes, thus resistant to dust and pollution.

Both ends spigot with groove for lip seal, suitable for connecting ducts to EN 1506 or EN 13180.

Casing air leakage to EN 1751, class C.

Special characteristics

Measurement accuracy ± 5 %
Low differential pressure of only about 10 – 26 % of the measured effective pressure

Materials and surfaces

Galvanised sheet steel construction

Casing made of galvanised sheet steel
Aluminium sensor tubes

Powder-coated construction (P1)

Casing made of galvanised sheet steel, powder-coated
Sensor tubes made of aluminium, powder-coated

Stainless steel construction (A2)

Casing made of stainless steel 1.4301
Sensor tubes made of aluminium, powder-coated

Construction

Galvanised sheet steel
P1: Powder-coated, silver grey (RAL 7001)
A2: Stainless steel

Technical data

Nominal sizes: 100 to 400 mm
Volume flow rate range: 10 to 1680 l/s or 36 to 6048 m³/h
Effective pressure range: approx. 5 – 250 Pa
Measuring unit differential pressure (pressure loss): 10 – 26 % of the measured effective pressure
Operating temperature: 10 to 50 °C

Attachments

Volume flow rate measurement with static differential pressure transducer emitting an actual value signal for integration into the central BMS.

Supply voltage 24 V AC/DC
Signal voltages 0 – 10 V DC or 2 – 10 V DC
EASYLAB: Integration using either 0 – 10 V DC signals or expansion modules (LonWorks, BACnet MS/TP, Modbus RTU)

Sizing data

V _______________________ [m³/h]

This specification text describes the general properties of the product. Texts for variants can be generated with our Easy Product Finder design programme.

Type
VMR Circular volume flow rate measuring unit

Material
       No entry: galvanised sheet steel
P1       Powder-coated (RAL 7001), silver grey
A2       Stainless steel

Flange
No entry: none
FL Flanges on both ends

Nominal size [mm]
100
125
160
200
250
315
400

Accessories
       No entry: none
D2       Lip seals on both ends
G2       Matching flanges for both ends

Attachments (differential pressure transducer)
       No entry: none
B10       Dynamic differential pressure transducer
BB0       Static differential pressure transducer

Signal voltage range
       For the actual value signal
       Only for attachment B10
E0       0 – 10 V
E2       2 – 10 V

Notes on the order code

VMR/.../ELAB/FH-*

VMR volume flow rate measuring units with EASYLAB TCU3 controllers are not certified for use with fume cupboards to EN 14175, part 6 (Fume cupboards – Variable air volume fume cupboards)

Order example: VMR/160/D2/B10/E0

Nominal size	160 mm
Accessories	Lip seals on both ends
Differential pressure transducer	Dynamic
Actual value signal	0 – 10 V

Order example: VMR/160/D2/B10/E0

Nominal size	160 mm
Accessories	Lip seals on both ends
Differential pressure transducer	Dynamic
Actual value signal	0 – 10 V

Order example: VMR/160/D2/B10/E0

Nominal size	160 mm
Accessories	Lip seals on both ends
Differential pressure transducer	Dynamic
Actual value signal	0 – 10 V

Variants, Attachments, Dimensions and weight

Volume flow rate measuring unit, variant VMR

VMR

Volume flow rate measuring unit
Spigot to make connections to the ducting

VMR-FL

Volume flow rate measuring unit
With flanges on both ends to make detachable connections to the ducting

Materials

Order code detail	Part	Material	Notes
–	Casing	Galvanised sheet steel
–	Sensor tubes	Aluminium
P1	Casing	Galvanised sheet steel
A2	Casing	Stainless steel, material no. 1.4301

Surfaces

Order code detail	Part	Surface	Notes
–	Casing	Untreated
–	Sensor tubes	Untreated
P1	Casing	Powder-coated, RAL 7001, silver grey
P1	Sensor tubes	Powder-coated, RAL 7001, silver grey
A2	Casing	Untreated
A2	Sensor tubes	Powder-coated, RAL 7001, silver grey

VMR, VARYCONTROL differential pressure transducers

Order code detail	Differential pressure transducer	Measurement principle
Universal
B10	Universal controller with integral differential pressure transducer TROX/Belimo	Dynamic
BB0	Universal controller with separate differential pressure transducer TROX/Belimo	Static

VMR, LABCONTROL differential pressure transducers

Order code detail	Differential pressure transducer	Measurement principle
EASYLAB
ELAB	EASYLAB TCU3 (recording of measured values for EASYLAB system)	Static

Anbauteile: VARYCONTROL Regelkomponenten

☒	Regel- größe	Schnittstelle	V_min -/ V_max - Verstellung	Differenzdruck- transmitter	Stellantrieb	Fabrikat
		Easylabregler		Statisch
Elab	RS, RE, PC, C	TCU3		Integriert	Schnelllaufender Stellantrieb
Elab	RS, PC, C	TCU3		Integriert	Schnelllaufender Stellantrieb
Elab	RE, PC, C	TCU3		Integriert	Schnelllaufender Stellantrieb
Elab	RS, RE, PC, FH, C	TCU3		Integriert	Schnelllaufender Stellantrieb
		Elektronischer Regler		Statisch	Elektronischer Regler
TMA	RS, RE, PC	TCU-LON-II mit LonWorks-Schnittstelle		Integriert	Schnelllaufender Stellantrieb
TMB	RS, RE, PC	TCU-LON-II mit LonWorks-Schnittstelle		Integriert	Schnelllaufender Stellantrieb (bürstenloser Motor)
TMA	RS, RE,	TCU-LON-II mit LonWorks-Schnittstelle		Integriert	Schnelllaufender Stellantrieb
TMB	RS, RE,	TCU-LON-II mit LonWorks-Schnittstelle		Integriert	Schnelllaufender Stellantrieb (bürstenloser Motor)
TMA	RE ,PC	TCU-LON-II mit LonWorks-Schnittstelle		Integriert	Schnelllaufender Stellantrieb
TMB	RE ,PC	TCU-LON-II mit LonWorks-Schnittstelle		Integriert	Schnelllaufender Stellantrieb (bürstenloser Motor)
TMA	RS, RE ,PC, FH	TCU-LON-II mit LonWorks-Schnittstelle		Integriert	Schnelllaufender Stellantrieb
TMB	RS, RE ,PC, FH	TCU-LON-II mit LonWorks-Schnittstelle		Integriert	Schnelllaufender Stellantrieb (bürstenloser Motor)








XF3	Δp			Integriert, 600 Pa	Federrücklaufantrieb	③
BB3	V			Separates Bauteil	Stellantrieb	②

① TROX, ② TROX/Belimo, ③ TROX/Gruner, ④ Sauter, ⑤ Siemens

☒ Bestellschlüsseldetail, V Volumenstrom, Δp Differenzdruck

VMR

VMR

Nominal size	VMR ØD mm	VMR m kg
100	99	0.8
125	124	1.0
160	159	1.4
200	199	1.7
250	249	2.1
315	314	2.7
400	399	3.4

VMR-FL

Nominal size	ØD mm	ØD₁ mm	ØD₂ mm	n	T mm	m kg
100	99	132	152	4	4	1.2
125	124	157	177	4	4	1.5
160	159	192	212	6	4	2.1
200	199	233	253	6	4	2.7
250	249	283	303	6	4	3.3
315	314	352	378	8	4	4.5
400	399	438	464	8	4	5.7

Installation details, Commissioning, Basic information and nomenclature

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.

Installation and commissioning

Any installation orientation (except units with static differential pressure transducer)
Note the upstream conditions
Static differential pressure transducer: Check zero point and correct, if necessary

Upstream conditions

The volume flow rate accuracy ΔV 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.

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.

Space required

Attachments	①	②	③
Attachments	mm
Without attachments	200	200	200
VARYCONTROL
Universal controller	250	200	250
LABCONTROL
EASYLAB	370	350	400

Volume flow rate calculation for air density 1.2 kg/m³

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

VMR/160
Δp_w = 100 Pa (manometer reading of effective pressure)
Volume flow rate V [m³/h]

Unit data

K value from table: K = 57 m³/h (15.9 l/s)

Principal dimensions

ØD [mm]

VAV terminal units made of stainless steel: Outer diameter of the spigot

VAV terminal units made of plastic: Inside diameter of the connecting spigot

ØD₁ [mm]

Pitch circle diameter of flanges

ØD₂ [mm]

Outer diameter of flanges

ØD₄ [mm]

Inside diameter of the screw holes of flanges

L [mm]

Length of unit including connecting spigot

L₁ [mm]

Length of casing or acoustic cladding

B [mm]

Duct width

B₁ [mm]

Screw hole pitch of flange (horizontal)

B₂ [mm]

Outside dimension of flange (width)

B₃ [mm]

Width of device

H [mm]

Duct height

H₁ [mm]

Screw hole pitch of flange (vertical)

H₂ [mm]

Outside dimension of flange (height)

H₃ [mm]

Unit height

n [ ]

Number of flange screw holes

T [mm]

Flange thickness

m [kg]

Weight including attachments for the automatic differential pressure measurement

Nomenclature

V_nom [m³/h] and [l/s]

Nominal volume flow rate (100 %)

V_min [m³/h] and [l/s]

Volume flow rate

ΔV [± %]

Volume flow rate accuracy

K value [m³/h] and [l/s]

Unit-related constant for air density 1.2 kg/m³

Δp_w [Pa]

Effective pressure

Δp_st [%]

Static differential pressure in relation to the measured effective pressure

Downloads

TROX Services

Productsearch A-Z Find out quickly and simply.

TROX Easy Product Finder Fast. Reliable. Innovative.

Tour de Competence Competence - exciting staged.

Type VMR

For the measurement of volume flow rates in ducts

Technical information

Function, Technical data, Specification text, Order code, Produktbeziehungen

Variants, Attachments, Dimensions and weight

Installation details, Commissioning, Basic information and nomenclature

Downloads

TROX Services

Attachment (max. 10MB)

Your message

Your message to

Attachment (max. 10MB)

Your message

Your message to