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 wireless
■ 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
Wireless-to-NFC converter ZIP-BT-NFC

Technical information

Principle of operation – volume flow rate measuring unit

① Effective pressure transducer (dynamic 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 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.

This specification text describes the general properties of the product.

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)

VMR	–	P1	/	125	/	BTD	/	0
\|		\|		\|		\|		\|
1		3		5		7		9

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

Downloads

product information

Product data sheet BTD

BTD_PD_2021_08_12_Update_2026_DE_en Product data sheet 690 KB pdf

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