XTD

Effective pressure transducer GT-VM-DD3

Type VME with control component XTD

VMR-125-XTD

Type VMR with control component XTD

XTD

EFFECTIVE PRESSURE TRANSDUCER FOR CLEAN AIR

Effective pressure transducers based on the dynamic measurement principle for volume flow rate measuring unit types VMR and VME

Use in ventilation and air conditioning systems with clean air
Analogue actual value signal for monitoring and evaluation by the central BMS
Recording of measured values for the display of volume flow rates or for the control of slave controllers
Suitable for constant and variable volume flow rates
No commissioning using factory-set parameterisation
Integral display for volume flow rate indication (l/s or m³/h)

General information

Application

Determination of volume flow rates for transmission and processing as an electrical signal for monitoring or tracking control
Measurement of effective pressure and conversion of the volume flow rate actual value into an analogue voltage 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
In the event of a strong occurrence of dust, 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 the XTS control component instead of the XTD transducer described here
Transducer factory-set to the unit-related constant (K value) of the measuring unit

Interface

Analogue interface with adjustable signal voltage range

Signal voltage ranges

0 – 10 V DC
2 – 10 V DC

Parts and characteristics

Differential pressure transducer with dynamic transducer
Connecting cable with 3 wires, approx. 0.9 m, halogen-free
Integral display

Construction

Type GT-VM-DD3 for volume flow rate measuring unit

For VME, all dimensions
For VMR, all dimensions

Commissioning

Completely factory-set
On-site adjusting is not required

Useful additions

Adjustment device GUIV-A
PC software WIN-VAV

Technical information

Function, Technical data, Specification text, Order code

Principle of operation of volume flow rate measuring unit Funktionsprinzip_XTDailink.ai.link

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 the effective pressure. For this reason the measuring unit is fitted with an effective pressure sensor. The effective pressure is converted into a voltage signal by an effective pressure transmitter with a dynamic measurement principle. The volume flow rate actual value is hence available as a voltage signal. Due to factory adjustment, 10 V DC always corresponds to the nominal flow rate (q_vnom;). Voltage ranges are stored in the transducer.

Effective pressure transducer GT-VM-DD3

Effective transducer for volume flow rate measuring units

Type	Part number	Volume flow rate measuring unit
GT-VM-DD3	A00000047143	VME, VMR

Effective pressure transducer GT-VM-DD3

Measurement principle/installation orientation	Dynamic measurement principle, position-independent
Supply voltage	24 V AC/DC ±20 % 50/60 Hz
Power consumption (when running/when idle)	0.5 W
Power rating	1.5 VA
Actual value signal output	0 – 10 V DC or 2 – 10 V DC; 0.5 mA max.
IEC protection class	0 – 10 V DC, Ra > 100 kΩ or 2 – 10 V DC, Ra > 50 kΩ
Protection level	0 – 10 V DC or 2 – 10 V DC, 0.5 mA max.
EMC	EMC to 2014/30/EU
Weight	0.15 kg

Range of display functions

Display functions

Volume flow rate actual value (unit optionally m³/h, l/s)
Display via 3-character display with position valuation labelling (upstroke symbolises thousands of digits)

Setting options

Unit of the volume flow rate display m³/h or l/s
Signal voltage range 0 – 10 V or 2 – 10 V DC

Category

Measuring units for volume flow rate

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.

Area of application

Differential pressure transducer with dynamic measuring principle for clean air in ventilation and air conditioning systems

Installation orientation

Either direction

Connection

Connecting cable with 3 wires, halogen-free

Supply voltage

24 V AC/DC

Interface

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

Interface information

Volume flow rate actual value

Special functions

Display for showing the volume flow rate actual value (m³/h or l/s) and adjustment of the signal characteristic and the volume flow rate unit

Parameter setting

Parameters specific to measuring unit are factory-set
Signal characteristic is factory-set
Subsequent adjustment on the device itself or via optional tools: adjustment device, PC software (wired in each case)

Factory condition

Electronic transducer factory-mounted on the measuring unit
Factory-set parameterisation and testing of air distribution technology; certified with sticker

VME

–

600

400

XTD

1 TypeVME Volume flow rate measuring unit 3 MaterialNo entry required: Galvanised sheet steel (standard construction)P1 Powder-coated RAL 7001, silver grey 5 Nominal size [mm]B × H 7 Attachments (control components)XTD Effective pressure transducer with dynamic measurement principle and display 9 Signal voltage range
0 0 – 10 V DC2 2 – 10 V DC

Order example: VME-P1/400x300/XTD/0

Materials	With powder coating
Nominal size	400 × 300 mm
Attachment	Effective pressure transducer with dynamic measurement principle and display
Operating mode	Signal voltage range 0 – 10 V DC corresponds to 0 – q_vnom;
Signal voltage range	0 – 10 V DC

Variants, Product details

Effective pressure transducer GT-VM-DD3

① Effective pressure transducer

② Connection for effective pressure

③ Display

④ Potentiometer

⑤ Selection of setting menu

*see pictures

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 controllable 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 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 volume flow rate actual values to voltage signals is shown in the characteristic curves.

The signal voltage range is pre-set in the factory in accordance with the order code entries
Signal voltage range adjustable by others on the unit using a potentiometer and integral display or with service tools

Actual value as feedback for monitoring or tracking control

On terminal U, the actual volume flow rate measured by the controller can be tapped as a voltage signal
The selected signal voltage range 0 – 10 V DC or 2 – 10 V DC is shown in the volume flow rate range 0 – qvnom; .

Commissioning

On-site adjusting is not required
After successful installation and wiring, the measuring unit is ready for use
Observe the volume flow rate ranges of the measuring unit; in particular, the rate may not fall below the minimum volume flow rate.

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XTD

EFFECTIVE PRESSURE TRANSDUCER FOR CLEAN AIR

General information

Technical information

Function, Technical data, Specification text, Order code

Variants, Product details

Downloads

product information

Product data sheet XTD

XTD

EFFECTIVE PRESSURE TRANSDUCER FOR CLEAN AIR

General information

Technical information

Function, Technical data, Specification text, Order code

Variants, Product details

Downloads

product information

Product data sheet XTD

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