Control component
Control component
VME with control
component BTD
VME with control component BTD
VMR with control
component BTD
VMR with control component BTD
mp-bus_bacnet_modbus_logo-komposition_logo_01png.png

Communication interfaces

Control component
VME with control
component BTD
VMR with control
component BTD
mp-bus_bacnet_modbus_logo-komposition_logo_01png.png

BTD

Effective pressure transducer for clean air


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

 

  • Use in ventilation and air conditioning systems, only with clean 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/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 only with clean air
  • Standard filtration in comfort air conditioning systems allows for use of the controller in the supply air without additional dust protection
  • Volume flow rate actual value is available as a network data point or linear voltage signal
  • Use TROX FlowCheck app and PC tool to configure the controller and the communication parameters
  • Transducer factory-set to the unit-related constant (K value) of the measuring unit

 

With heavy dust levels in the room

  • Install appropriate exhaust air filters upstream, as a partial volume flow is routed through the transducer for volume flow rate measurement.

 

If the air is additionally contaminated, e.g. with fluff or sticky components

  • Use of the BTS attachment group instead of the BTD universal controller described here 


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 dynamic measurement principle (dynamic transducer)
  • Plug-in terminals for supply line and controls including cover
  • NFC and service interface
  • Indicator lights for displaying the operating mode
  • Controller casing prepared with 4 openings for threaded connections, 2 cable glands M16 x 1.5 for connecting cable in the supply package

Construction

Type VRU-D3-M/B TR for volume flow rate measuring unit

  • For VME all dimensions
  • For VMR 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

Specification text

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 dynamic pressure measurements in ventilation and air conditioning systems with clean 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 actual value
  • 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 is factory mounted on the measuring unit
  • Factory-set parameters
  • Functional test with air (see sticker)

TECHNICAL INFORMATION

Function, Order code

  • FUNCTION
  • ODER CODE
Principle of operation – volume flow rate measuring unit Funktionsprinzip_XTDai.png

① Effective pressure transducer (dynamic measurement principle)

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

③ Analogue actual value signal


The volume flow rate measurement is carried out by measuring an 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 dynamic 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. 


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)

BTD Effective pressure transducer for measuring units, dynamic

9 Signal voltage range

0 0 – 10 V DC

2 2 – 10 V DC


Variants

  • VARIANTS


Product details, Technical data

  • PRODUCT DETAILS
  • TECHNICAL DATA

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

Effective pressure transducer VRU-D3-M/B TR Effective pressure transducer VRU-D3-M/B TR


Effective pressure transducer for volume flow rate measuring units

VAV measuring units

Type

Part number

VME, VMRVRU-D3-M/B TRA00000073650


Effective pressure transducer VRU-D3-M/B TR



Measurement principle


Dynamic, independent of the transducer's installation orientation

Nominal voltage

AC/DC 24 V
Nominal frequency50/60 Hz

Functional range

19.2-28.8 V AC / 21.6 - 28.8 V DC

Power requirement (normal operation/when idle)



1.5 W


Power rating

2 VA

Power rating - note

Imax 20 A at 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 TROX FlowCheck app

Actual value signal output

0 – 10 V, 2 – 10 V, max. 0.5 mA


IEC/EN protection classIII (protective extra-low voltage)
Protection levelIP 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, WR, W-
Modbus, BACnetR, WR, W-
MP busR, WR, W-
Set bus parametersR, WR, W-
Trend display

Yes

Yes-

R,W = Read/write access.


- = Not available with this tool.

Communication interface Modbus RTU

NumberRegister addressDescriptionRangeUnitScalingAccess
76

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



(*6)

0 – 15,000

%

0.01RD
87

Absolute volume flow rate

(*6)

0 – qvnom

m³/h

1RD
98

Sensor value (voltage, resistance, switch)


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

0 – 65,535

mV,

Ω,

0/1,

0.1RD
1110

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

0.001RD
1211

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

0.001RD
5150

Relative differential pressure 



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

0 – 20,000

%

0.01RD
5251

Absolute differential pressure

-1,000 – 15,000

[Pa]

0.1RD
5352

[–]
5453

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

(Low word) < 16 of 32 bit.

-10,000,000 – 100,000,000

UnitSel

0.001RD
5554

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



(High word) > 16 of 32 bit.

-10,000,000 – 100,000,000 

UnitSel

0.001RD
10099

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
101100

Serial number, part 1

Example: 00839-31324-064-008.

1st part: 00839

2st part: 31324

3st part: 008

RD
102101

Serial number, part 2

RD
103102

Serial number, part 3

RD
104103

Firmware version

Example: 101, version 01.01.

RD
105104

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
108107

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
110109

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

1WR
111110

Nominal volume flow rate in m³/h

0 – 60,000

m³/h

1RD
113112

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

0.001RD
114113

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

0.001RD
118117

Unit selection –



Unit selection for reg. addresses 11 and 12.

0: –

1: m³/h

2: l/s

3: –

4: –

5: –

6: cfm

-

WR
119118

Output
Actual value information


0: Analogue (0 – 10 V, 2 – 10 V)


1: Bus (Modbus, BACnet, MP bus)


Factory setting: Analogue 

WR
125124

Applications

0: Volume flow control

1: Pressure control

2: Room pressure control

3: Flow measurement

RD
126125

Installation altitude

0 – 3,000

Factory setting: 0

m

1WR
127126

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
146145

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 nameTROX 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 numberVRU – 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 ProfileBACnet 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 CapabilityNo
Data Link Layer OptionsMS/TP master, baud rates: 9600, 19200, 38400, 76800, 115200
Device Address BindingNo static device binding supported
Networking OptionsNone
Character Sets SupportedISO 10646 (UTF-8)
Gateway OptionsNone
Network Security OptionsNon-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 NameObject TypeDescriptionValuesCOV IncrementAccess
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
RelFlowAI[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_UnitSelAI[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
Sens1AnalogueAI[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
Sens1SwitchBI[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
BusTerminationBI[99]

Terminal resistor 



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


0: Not active


1: Active

RD
SummaryStatusBI[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

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