BTD

Control component

VME with control component BTD

VMR with control component BTD

Communication interfaces

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 BlueCON
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
BlueCON-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)

Technische informatie

Function, Order code

Principle of operation – volume flow rate measuring unit

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 (q_vnom). 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

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

① Effective pressure transducer

② Connection point for effective pressure

③ NFC interface

④ Blank cap (not in use)

⑤ Cable glands (for voltage and signals, respectively)

⑥ Fixing holes

⑦ Connection point for effective pressure sensor

Product details, Technical data

Characteristic of the actual value signal

① Signal voltage range 0 – 10 V

② Signal voltage range 2 – 10 V

1* = qvnom; nominal volume flow rate

2* = qvmin unit minimum volume flow rate

Calculation of volume flow rate actual value at 0 – 10 V

Calculation of volume flow rate actual value at 2 – 10 V

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

Downloads

Product informatie

Product data sheet BTD

BTD_PD_2021_08_12_DE_en Product data sheet 600 KB pdf

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