A00000073652_1psd.psd.link
Effective pressure transducer VRU-M1-M/B TR
Kopie_von_XD0_gc_04svg.png

Volume flow rate measurement – static transducer

VME_img_07_BTSpsd.psd.link
VME-BTS

VME with control component BTS

VMRK

VMRK with control component BTS

VMR_img_08psd.psd.link
Volumenstrommesseinrichtung VMR

VMR with control component BTD

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Communication interfaces

A00000073652_1psd.psd.link
Kopie_von_XD0_gc_04svg.png
VME_img_07_BTSpsd.psd.link
VMRK
VMR_img_08psd.psd.link
mp-bus_bacnet_modbus_logo-komposition_logo_01png.png

BTS

Effective pressure transducer for contaminated air, e.g. contaminated extract air


Effective pressure transducer based on the static measurement principle for volume flow rate measuring units VME, VMR and VMRK

  • Use in ventilation and air conditioning systems, with clean and contaminated air
  • Analogue or digital actual value signal for monitoring and evaluation by the central BMS
  • Suitable for constant and variable volume flows
  • No commissioning required as parameters are factory set 
  • Recording of measured values for the display of volume flow rates or for the control of slave controllers
  • Service access for PC configuration software
  • Access with a smartphone thanks to NFC interface and Bluetooth
  • Data transparency due to bus communication with MP bus, Modbus RTU or BACnet MS/TPHigh data transparency through bus communication MP bus, Modbus RTU or BACnet MS/TP

General information

Application
  • Determination of volume flow rates and transmission/processing as an electrical signal for monitoring/tracking control
  • Measurement of an effective pressure and conversion of the volume flow rate actual value into an analogue and digital actual value signal 
  • For use with clean air and, in particular, contaminated air
  • Volume flow rate actual value is available as a network data point or linear voltage signal
  • The TROX FlowCheck app and PC-Tool can be used to configure the volume flow rate measuring unit and the communication parameters
  • Transducer factory-set to the unit-related constant (K value) of the measuring unit


Interface

Analogue interface
  • Analogue interface with adjustable signal voltage range

Digital communication interface (bus)
  • MP bus
  • Modbus RTU, RS485
  • BACnet MS/TP, RS485
  • Data points, see bus lists

Factory setting
  • Actual value output via analogue interface and Modbus communication interface


Signal voltage ranges
  • 0 – 10 V DC
  • 2 – 10 V DC

Parts and characteristics
  • Effective pressure transducer according to the static measurement principle (static transducer)
  • Plug-in terminals for supply line and controls including cover
  • NFC and service interface
  • Indicator lights for displaying the operating mode
  • Transducer casing prepared with 4 openings for cable glands; 2 cable glands M16 x 1.5 for connecting cable are part of the supply package


Constructions

Type VRU-M1-M/B TR for volume flow rate measuring unit
  • For VME all dimensions
  • For VMR all dimensions
  • For VMRK all dimensions


Commissioning
  • All parameters are factory-set
  • On-site adjusting is not required
  • Modbus/BACnet/MP bus interface: additional commissioning steps may be required
  • Operating parameters can be adjusted using the TROX FlowCheck app



Useful additions

TROX FlowCheck app for Android and iOS
  • Belimo PC-Tool
  • Bluetooth-to-NFC converter ZIP-BT-NFC

Technical information

Function, Specification text

  • Function
  • SPECIFICATION TEXT
Principle of operation of volume flow rate measuring unit Funktionsprinzip_XTSailink.ai.link

① Effective pressure transducer (static measurement principle)

② Transducer for converting the effective pressure signal into a volume flow rate signal

③ Analogue actual value signal

① Effective pressure transducer (static measurement principle)

② Transducer for converting the effective pressure signal into a volume flow rate signal

③ Analogue actual value signal


The volume flow rate measurement is carried out by measuring the effective pressure. The volume flow rate measuring unit is fitted with an effective pressure sensor for this purpose. The effective pressure is converted into a voltage signal by an effective pressure transducer with a static measurement principle. The volume flow rate actual value is available as a voltage signal and digital information. The factory setting is such that 10 V DC always corresponds to the nominal flow rate (qvnom). Voltage ranges are stored in the transducer.


Category
  • Volume flow rate measuring unit


Application
  • Recording of a constant or variable volume flow rate actual value, e.g. for connection to the central building management system for the purpose of monitoring or integration into a room balancing system.


Pressure range
  • Effective pressure transducer for static pressure measurements in ventilation and air conditioning systems with contaminated air


Installation orientation
  • Either direction


Connection
  • Plug-in terminals with cover. No connection box required.



Supply voltage
  • 24 V AC/DC


Interface/Control

Analogue signal

  • 0 – 10 V DC; 2 – 10 V DC

or digital bus connection
  • Modbus RTU
  • BACnet MS/TP
  • MP bus

Interface type can be set and connected by others


Interface information

Analogue signal:
  • Volume flow rate actual value

Bus interface:
  • Volume flow rate
  • Error status


System connections

  • Flexible integration into digital bus systems


Parameter setting
  • Parameters specific to measuring unit are factory-set
  • Signal characteristic factory-set

Subsequent adjustment using optional tools:
  • TROX FlowCheck app, PC software (wired)


Condition upon delivery
  • Electronic transducer factory mounted on the measuring unit
  • Factory-set parameters
  • Functional test with air (see sticker)



Order code, Variants

  • ORDER CODE
  • VARIANTS
VMRP1 / 125 / BTS / 0
|||||
13579

1 Type
VMR Volume flow rate measuring unit

3 Material
Galvanised sheet steel (standard construction)
P1 Powder-coated RAL 7001, silver grey
A2 Stainless steel construction

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

7 Attachments (effective pressure transducer)
BTS Effective pressure transducer for measuring units, static

9 Signal voltage range
0 0 – 10 V DC
2 2 – 10 V DC

Order example: FK2-EU-W/DE/600×200×500/ES/A0/Z4

MaterialGalvanised sheet steel
Nominal size100 mm
AttachmentEffective pressure transducer for static measurements
Signal voltage range0 – 10 V DC


Technical data, Product details

  • TECHNICAL DATA
  • PRODUCT DETAILS
Effective pressure transducer VRU-M1-M/B TR A00000073652_1psd.psd.link

Effective pressure transducer for volume flow rate measuring units

VAV measuring units

Type

Part number



VME, VMR, VMRK


VRU-M1-M/B TR

A00000073652




Effective pressure transducer VRU-M1-M/B TR



Measurement principle


Static, independent of the transducer's installation orientation

Nominal voltage

AC/DC 24 V
Nominal frequency 50/60 Hz

Functional range

AC 19.2 – 28.8 V/DC 21.6 – 28.8 V

Power requirement (normal operation/when idle)



1.5 W


Power rating

2 VA

Power rating - note

Imax 20 A @ 5 ms


Bus connection

Modbus RTU*, BACnet MS/TP, MP bus

Adjustable communication parameters with Modbus RTU

Baud rate: 9600, 19200, 38400*, 76800, 115200;

Address: 1*,2.3 – 247;

Parity: 1-8-N-2*, 1-8-N-1, 1-8-E-1, 1-8-O-1;

Number of nodes: max. 32 (without repeater)

Terminal resistor: 120 Ω;


Adjustable communication parameters with BACnet MS/TP

Baud rate: 9600, 19200, 38400*, 76800, 115200;

Address: 1*,2.3 – 127;

Number of nodes: max. 32 (without repeater)

Terminal resistor: 120 Ω;


Addressing

By others, with Smartphone app

Actual value signal output

0 – 10 V, 2 – 10 V, max. 0.5 mA


IEC/EN protection class III (protective extra-low voltage)
Protection level IP 42

EMC

CE according to 2014/30/EU
Weight

0,3 kg


* Factory setting.


Commissioning
  • On-site adjusting is not required
  • After successful installation and wiring, the measuring transducer is ready for use
  • Only briefly remove the protective cap of the measuring transducer during wiring
  • Observe the volume flow rate ranges of the measuring unit; in particular, the rate may not fall below the minimum volume flow rate


Service tools – range of functions

Function / parameter setting



TROX FlowCheck app




PC-Tool




ZTH-EU




Mode, actual value signal 0 - 10 V, 2 - 10 V DC


R, W R, W -
Modbus, BACnet R, W R, W -
MP bus R, W R, W -
Set bus parameters R, W R, W -
Trend display

Yes

Yes -
R,W = Read/write access.
- = Not available with this tool.

Communication interface Modbus RTU

Number Register address Description Range Unit Scaling Access
7 6

Relative volume flow rate related to qvnom (reg. address 110).



(*6)

0 – 15,000

%

0.01 RD
8 7

Absolute volume flow rate

(*6)

0 – qvnom

m³/h

1 RD
9 8

Sensor value (voltage, resistance, switch)


Value depends on the setting of the sensor type (reg. address 107).

0 – 65,535

mV,

Ω,

0/1,

0.1 RD
11 10

Absolute volume flow rate in selected volume flow unit acc. to (reg. address 117).



(Low word) < 16 of 32 bit.



(*6)

0 – 500,000,000

UnitSel

0.001 RD
12 11

Absolute volume flow rate in selected volume flow unit acc. to (reg. address 117).



(High word) > 16 of 32 bit.



(*6)

0 – 500,000,000

UnitSel

0.001 RD
51 50

Relative differential pressure 



Depending on application case acc. to (reg. address 128).

0 – 20,000

%

0.01 RD
52 51

Absolute differential pressure

-1,000 – 15,000

[Pa]

0.1 RD
53 52

[–]
54 53

Absolute differential pressure in selected unit (reg. address 145)

(Low word) < 16 of 32 bit.

-10,000,000 – 100,000,000

UnitSel

0.001 RD
55 54

Absolute differential pressure in selected unit acc. to (reg. address 145) 



(High word) > 16 of 32 bit.

-10,000,000 – 100,000,000 

UnitSel

0.001 RD
100 99

Bus terminal resistor 



Indicates whether the terminal resistor (120 Ω) is active or not active.


Can only be set using service tools.

0: Not active

1: Active

Factory setting: Not active

RD
101 100

Serial number, part 1

Example: 00839-31324-064-008.

1st part: 00839

2st part: 31324

3st part: 008

RD
102 101

Serial number, part 2

RD
103 102

Serial number, part 3

RD
104 103

Firmware version

Example: 101, version 01.01.

RD
105 104

Malfunctions and service information –

automatic reset if status has ceased.

Bit 0: –

Bit 1: -

Bit 2: -

Bit 3: –

Bit 4: Error of dP sensor

Bit 5: Return air flow detected

Bit 6: Volume flow rate too low

Bit 7: -

Bit 8: -

Bit 9: -

Bit10: Bus monitoring triggered

Bit 11: -

Bit 12: Pressure sensor incorrectly connected

Bit 13: Pressure sensor not reached

Bit 14: Error in dP sensor outside of measuring range

RD
108 107

Type of sensor 

If reg. address 118 = 0 (analogue), then reg. address 107 = 1 (active) for mV.

0: None

1: Active

2: Passive

3: –

4: Switch

Factory setting: None

WR
110 109

Time until bus timeout monitoring is triggered



If reg. 108 ≠ 0, then the initial setting is automatically reg. 108 = 120 s. 

0 – 3,600 


0: Not active


Factory setting: Not active


s

1 WR
111 110

Nominal volume flow rate in m³/h

0 – 60,000

m³/h

1 RD
113 112

Nominal volume flow rate in selected volume flow unit acc. to (reg. address 117)



(Low word) < 16 of 32 bit.

0 – 60,000,000

UnitSel

0.001 RD
114 113

Nominal volume flow rate in selected volume flow unit acc. to (reg. address 117)



(High word) > 16 of 32 bit.

0 – 60,000,000

UnitSel

0.001 RD
118 117

Unit selection –



Unit selection for reg. addresses 11 and 12.

0: –

1: m³/h

2: l/s

3: –

4: –

5: –

6: cfm

-

WR
119 118

Output
Actual value information


0: Analogue (0 – 10 V, 2 – 10 V)


1: Bus (Modbus, BACnet, MP bus)


Factory setting: Analogue 

WR
125 124

Applications

0: Volume flow control

1: Pressure control

2: Room pressure control

3: Flow measurement

RD
126 125

Installation altitude

0 – 3,000

Factory setting: 0

m

1 WR
127 126

Nominal differential pressure in the selected unit acc. to (reg. address 145)



More in (reg. address 128)

D3: 0 – 50000

M1: 0 – 60000

M1R: 0 – 60000

UnitSel

RD
146 145

Selection of the pressure unit 

The selected unit is displayed in (reg. address 126).

0: Pascal


1: –


2: Water column


Factory setting: Pascal 

[–]

RD = Read-only access
WR = Read/write access



Protocol Implementation Conformance Statement – PICS (general information)

Date

2020-11-03


Vendor name TROX GmbH
Vendor ID

423


Product name

VRU-D3-M/B TR  A00000073650
VRU-M1-M/B TR  A00000073652"
VRU-M1R-M/B TR A00000073654



(Description string preset at factory according to hardware plattform)

Product model number VRU – BAC
Application software version

01.03.0001


Firmware revision

10.05.0000


BACnet Protocol Revision

12


Product description

Controller for



  • VAV/CAV application
  • Pressure application
  • Measurement application


(Description string preset at factory according application)

BACnet Standard Device Profile BACnet Application Specific Controller (B-ASC)
BACnet Interoperability Building Blocks Supported

Data Sharing – ReadProperty-B (DS-RP-B)
Data Sharing – ReadPropertyMultiple-B (DS-RPM-B)
Data Sharing – WriteProperty-B (DS-WP-B)
Data Sharing – WritePropertyMultiple-B (DS-WPM-B)
Data Sharing – COV-B (DS-COV-B)
Device Management – DynamicDeviceBinding-B (DM-DDB-B)
Device Management – DynamicObjectBinding-B (DM-DOB-B)
Device Management – DeviceCommunicationControl-B (DM-DCC-B)


Segmentation Capability No
Data Link Layer Options MS/TP master, baud rates: 9600, 19200, 38400, 76800, 115200
Device Address Binding No static device binding supported
Networking Options None
Character Sets Supported ISO 10646 (UTF-8)
Gateway Options None
Network Security Options Non-secure device


Object processing



Object type




Optional properties




Writeable properties




Analogue input [AI]




Description
COV Increment




COV Increment




Analogue Output [AO]




Description
COV Increment




Present Value
COV Increment
Relinquish Default




Analogue Value [AV]




Description

COV Increment




Present Value

COV Increment




Binary Input [BI]




Description
Active Text
Inactive Text




Device




Description
Location
Active COV Subscriptions
Max Master
Max Info Frames
Profile Name


Object Identifier
Object Name
Location
Description
APDU Timeout (1000 – 60000)
Number Of APDU Retries (0 – 10)
Max Master (1 – 127)
Max Info Frames (1 – 255)



Multi-state Input [MI]




Description
State Text




Multi-state Output [MO]




Description
State Text




Present Value
Relinquish Default




Multi-state Value [MV]




Description
State Text




Present Value (if marked)



Processing of services

  • The device does not support the services "Create object" and "Delete object"
  • The specified maximum length of the writable character strings is based on single-byte characters
  1. 1. Object name 32 characters
  2. 2. Location 64 characters
  3. 3. Description 64 characters
  • The device supports the DeviceCommunicationControl Services, no password necessary
  • A maximum of 6 active COV subscriptions with a run time of 1 – 28800 s (maximum of 8 h) is supported


Communication interface BACnet MS/TP

Object Name Object Type Description Values COV Increment Access
Device

Device [Inst.No]

0 – 4,194,302

Factory setting: 1

WR
RelDeltaP

AI[9]

Relative differential pressure in % related to DeltaPnom_Pa AV[122]



0 – 150

0.01 – 150

Factory setting: 1

RD
RelFlow AI[10]

Relative volume flow rate in % related to Vnom_m3h AV[112]

Status flags: (*4)

0 – 150

0.01 – 150

Factory setting: 1

RD
AbsFlow_m3h

AI[12]

Absolute volume flow rate in m³/h

Status flags: (*4)

0 – 60,000

1 – 60,000

Factory setting: 10

RD
DeltaP_UnitSel

AI[18]

Absolute differential pressure in selected unit acc. to UnitSelPressure MV[127]

-10,000 – 100,000

0.001 – 100,000

Factory setting: 1

RD
AbsFlow_UnitSel AI[19]

Absolute volume flow rate in selected unit acc. to UnitSelAirFlow MV[121]



Status flags: (*4)


0 – 500,000

0.01 – 500,000

Factory setting: 1

RD
Sens1Analogue AI[20]

Sensor 1 as analogue value 
 

If Sensor1Type MV[220] = 2 (active), then display = analogue value in 0 – 10 V.

If Sensor1Type MV[220] = 3 (passive), then display = resistance value.

If RmPCascade MV[10] = 2 (enabled) or 3 (quickly enabled), then the sensor input is not available. 
 

Status flags: (*5)

0 – 65535

0.01 – 1000

Factory setting: 1

RD
DeltaP_Pa

AI[29]

Absolute differential pressure in Pa

0 – 600

0.01 – 600

Factory setting: 10

RD
Vnom_m3h

AV[112]

Nominal volume flow rate in m³/h

0 – 50,000

0.01 – 50,000

Factory setting: 1

RD
Vnom_UnitSel

AV[119]

Nominal volume flow rate in selected unit acc. to UnitSel MV[121]


0 – 250,000

0.01 – 1,000:

Factory setting: 1

RD
SystemAltitude

AV[120]

Installation altitude in metres above sea level

0 – 3,000

1 – 3,000

Factory setting: 10

WR
DeltaPnom_Pa

AV[122]

Nominal differential pressure in Pa 



The nominal differential pressure depends on the selected pressure sensor (D3, M1, M1R).


Depending on the selected application, the nominal differential pressure serves as dp@Vnom or as the maximum pressure limitation


If ApplicationSel MV[2] = 1 (flow control), then display = nominal differential pressure


D3: 0 – 500

M1: 0 – 600

M1R: 0 – 75

1 – 600

Factory setting: 1

RD
DeltaPnom_UnitSel

AV[129]

Nominal differential pressure in selected unit acc. to UnitSelPressure MV[127]



More: see AV[122].



0.01 – 1000

Factory setting: 1

RD
Sens1Switch BI[20]

Switch status of the switch at the sensor input 

If SenType MV[220] = 5 (switch), then Sens1Switch BI[20] = active.

Status flags: (*6)

0: Inactive

1: Active

RD
BusTermination BI[99]

Terminal resistor 



Shows whether the terminal resistor (120 Ω) has been activated with a service tool.


0: Not active


1: Active

RD
SummaryStatus BI[101]

Condensed status 


Groups together the status of the objects: 

"StatusSensor" MI[103] 
"StatusFlow" MI[104] 
"StatusPressure" MI[109] 
"StatusDevice" MI[110]  

Not equal to 1: OK

1: Not OK

RD
ApplicationSel

MV[2]

Display of application 

VRU-D3-M/B TR, VRU-M1-M/B TR

- Flow control
- Pressure control
- Flow measurement

VRU-M1R-M/B TR
- Room pressure control

1: Flow control

2: Pressure control

3: Room pressure control

4: Flow measurement

RD
StatusSensor

MI[103]

Status of the differential pressure sensor 

If status end = automatic reset

1: OK

2: dP sensor not OK

3: dP sensor outside of measuring range

4: dP sensor incorrectly connected

RD
StatusFlow

MI[104]

Volume flow rate status 


If there is no volume flow rate within 600 s, then StatusFlow MI[104] = 3.

1: OK

2: –

3: No airflow detected

RD
StatusPressure

MI[109]

Differential pressure status 

If the differential pressure is not reached within 180 s, then StatusPressure MI[109] = 3.

1: OK

2: –

3: Pressure not reached

RD
StatusDevice

MI[110]

Status of the device during bus monitoring 


According to BusWatchdog AV[130].

1: OK

2: Bus timeout monitoring activated

RD
UnitSelAirFlow

MV[121]

Selection of the volume flow unit 

The selected unit is indicated in AI[19] and AV[104]

1: –

2: m³/h

3: l/s

4: –

5: –

6: –

7: cfm

WR
SpSource

MV[122]

Selection of actual value output

1: Analogue (0 – 10 V, 2 – 10 V)


2: Bus (Modbus, BACnet, MP bus)


Factory setting: Analogue

WR
UnitSelPressure

MV[127]

Selection of the pressure unit

The selected unit is indicated in DeltaP_UnitSel AI[18] and DeltaPnom_UnitSel AV[129].

1: Pascal

3: Water column

Factory setting: pascal 

WR
Sens1Type

MV[220]

Definition of the sensor type 

If Sens1Type MV[220] = 2 (active) or 3 (passive), then Sens1Analog AI[20] active.

If Sens1Type MV [220] = 5 (switch), then Sens1Schalter BI[20] active. 

1: None

2: Active sensor (in hybrid mode)

3: passive sensor 

4: –

5: Switch

Factory setting: none 

WR

RD = Read-only access
WR = Read/write access
C = Commendable with priority array

Status flags: 

(*5) If Sens1Type MV[220] = 1 (none), then Out of Service = 1

(*6) If Sens1Type MV[220] ≠ 5, then Out of Service = 1

Analogue interface 0 – 10 V DC or 2 – 10 V DC

The analogue interface can be set for signal voltage range 0 – 10 V DC or 2 – 10 V DC. The assignment of actual flow rates to voltage signals is shown in the characteristic curves. 

  • The signal voltage range is set in the factory according to the order code
  • The signal voltage range can be adjusted by others using the TROX FlowCheck App or PC-Tool

If the digital communication interface is used, the output channel can be changed to Modbus, BACnet or MP bus at any time via the TROX FlowCheck app.



Actual value as feedback for monitoring or tracking control

  • The actual volume flow rate measured by the controller can be picked up as a voltage signal at terminal 5
  • The selected signal voltage range 0 – 10 V DC or 2 – 10 V DC is mapped on the volume flow rate range 0 – qvNom
  • In analogue mode, there is the parallel option of querying operating data via the digital communication interface (hybrid mode)


Digital communication interface

To use the digital communication interface, a change by others using the TROX FlowCheck app is required. The bus interface can be set to Modbus, BACnet or MP bus. For a smooth exchange of data in the bus network provided by others, the communication parameters and the user address for the bus interface are required. The communication parameters of the bus systems (address, baud rate, etc.) can be set using the TROX FlowCheck app. The Modbus and BACnet interfaces provide standardised bus register/object access to the available data points. Additional hardware and software from official MP bus partners is required for further processing of the MP bus data.



Actual value as feedback for monitoring or tracking control
  • The actual values can be read out in m³/h in both the Modbus and BACnet (factory setting). Other units such as l/s and cfm are possible
  • The volume flow rate actual value can also be read out as a relative percentage value via additional data points. 0 – 100 % is mapped on the volume flow rate range 0-qvNom
  • In addition to the actual value of the volume flow rate, further information on the other Modbus registers/BACnet objects can be read out as well
  • Overview of the registers/objects in the communication tables
  • For diagnostic purposes, the actual value of the volume flow rate can be picked up at terminal 5 in bus mode
  • The volume flow rate range 0 – qvNom always corresponds to the signal voltage range of (0)2 – 10 V DC

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For general question regarding products or services you can also call:
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