Control component
Communication interfaces
Effective pressure transducer based on the dynamic measurement principle for volume flow rate measuring units VME and VMR
Application
With heavy dust levels in the room
If the air is additionally contaminated, e.g. with fluff or sticky components
Interface
Analogue interface
Digital communication interface (bus)
Factory setting
Signal voltage ranges
Parts and characteristics
Construction
Type VRU-D3-M/B TR for volume flow rate measuring unit
Commissioning
Useful additions
TROX FlowCheck app for Android and iOS
Category
Application
Pressure range
Installation orientation
Connection
Supply voltage
Interface/Control
Analogue signal
or digital bus connection
Interface type can be set and connected by others
Interface information
Analogue signal:
Bus interface:
System connections
Parameter setting
Subsequent adjustment using optional tools:
Condition upon delivery
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
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
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.
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
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
Effective pressure transducer for volume flow rate measuring units
VAV measuring units | Type | Part number |
| VME, VMR | VRU-D3-M/B TR | A00000073650 |
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 frequency | 50/60 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 class | III (protective extra-low voltage) |
| Protection level | IP 42 |
EMC | CE according to 2014/30/EU |
| Weight | 0.3 kg |
* Factory setting
Commissioning
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 | 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 (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
(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) |
| 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 |
Analogue Output [AO] | Description | Present Value |
Analogue Value [AV] | Description COV Increment | Present Value COV Increment |
Binary Input [BI] | Description | |
Device | Description | Object Identifier |
Multi-state Input [MI] | Description | |
Multi-state Output [MO] | Description | Present Value |
Multi-state Value [MV] | Description | Present Value (if marked) |
Processing of services
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
| 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 VRU-M1R-M/B TR | 1: Flow control 2: Pressure control 3: Room pressure control 4: Flow measurement | – | RD |
| StatusSensor | MI[103] | Status of the differential pressure sensor | 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
| 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
| 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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Contact
We are here for you
Please specify your message and type of request
Tel.: +49 (0)2845 / 202-0 | Fax: +49 (0)2845/202-265
Contact
Thank you for your message!
Your message is send and will be processed shortly.
Our department for Service-Requests will contact you asap.
For general question regarding products or services you can also call:
Tel.: +49 (0)2845 / 202-0 | Fax: +49 (0)2845/202-265
