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  3. Beck. Transmitter 985V for Volume Flow or Flow Velocity

Beck. Transmitter 985V for Volume Flow or Flow Velocity

Beck. Transmitter 985V for Volume Flow or Flow Velocity

Beck. Transmitter 985V for Volume Flow or Flow Velocity

Product catalog summary
General Description: The 985V series transmitters are designed for measuring volume flow, flow velocity, and pressure. They feature a jumper for switching between these measurements.
Applications: Suitable for monitoring gaseous, non-combustible, and non-aggressive media in building automation, air conditioning systems, clean rooms, laboratories, VAV applications, and dynamic filter and ventilator monitoring.
Configuration: Users can select a calculation formula and k-factor or create a reference volume flow/velocity. A menu guide assists with settings.
Output Signal: The output signal is switchable between 0-10 Volt and 4-20 mA. The device includes an adjustable transistor switching output with a maximum capacity of 30 VDC/100 mA.
Response Time: Configurable via a jumper for slow (factory setting) or fast response times.
Calibration and Reset: Manual offset calibration is available for 985VM, while 985VA performs automatic zero-point adjustment. The device can be reset to factory settings.
Mounting: Can be mounted in any position, with zero offset calibration to eliminate position errors.
Technical Specifications:
  • Measuring Method: Piezoresistive pressure transducer
  • Supply Voltage: 18-30 VAC/VDC
  • Output Signal: 0-10 V or 4-20 mA
  • LED Display: Red, 4 digits
  • Units: m3/h, m3/s, cfm, l/s for volume flow; m/s, ft/min for flow velocity
  • k-factor Range: 0.001 to 9.9 x 105
  • Switching Output: Transistor, max 30 VDC/100 mA
  • Current Draw: 100 mA (DC) / 230 mA (AC)
  • Load: 20-500 Ω for 4-20 mA, ≥ 1kΩ for 0-10 V
  • Medium: Air and non-combustible, non-aggressive gases
  • Temperature Range: -20 to 70°C for 985VM, -10 to 50°C for 985VA
  • Linearity: ≤ ±0.5% FS
  • Uncertainty: ±1% FS
  • Humidity: 0-95% rel., non-condensing
  • Response Times: 0.2 s and 1.0 s
  • Process Connection: Hose connection with 4/6 mm outer diameter
  • Electrical Connection: Plug-in terminals or M12/4-pole connector
  • Housing: ABS, dimensions approx. 81 x 83 x 41 mm, weight approx. 125 g
  • Protection Class: IP65
  • CE Conformance: EMC and RoHS Directives
Pressure Ranges: Various models available with pressure ranges from 0-50 Pa to 0-10 kPa, with specific overload and bursting pressures.
Order Matrix: Options for offset calibration, pressure range, display units, output signal, and electrical connection are provided.
Accessories: Climaset® kits, duct connecting pipes, angled metal pipes, rubber grommets, and rolls of PVC or silicone hose are available.
Terminal Assignments: Detailed terminal assignments for analog output signals and switching outputs are provided.
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Catalog excerpts

Beck. Transmitter 985V for Volume Flow or Flow Velocity-1

Beck. Transmitter 985V for Volume Flow or Flow Velocity

 Open the catalog to page 1
Beck. Transmitter 985V for Volume Flow or Flow Velocity-2

Transmitter 985V for Volume Flow or Flow Velocity Piezoresistive pressure transducer 18 ... 30 VAC / VDC 0 ... 10 V or 4 ... 20 mA Red; 4 digits m3/h; m3/s; cfm; l/s m/s; ft/min 0.001 ... 9.9 x 105 Transistor; maximum switching capacity of 30 VDC / 100 mA 100 mA (DC) / 230 mA (AC) 20 ... 500 Q > 1kQ (< 10 mA) Air and non-combustible and non-aggressive gases -20 ... 70°C -10 ... 50°C General description The transmitters of the 985V series are used to measure volume flow or flow velocity and pressure. A jumper enables switching between volume flow or flow velocity and pressure measurement. Applications...

 Open the catalog to page 2
Beck. Transmitter 985V for Volume Flow or Flow Velocity-3

Pressure ranges Model Pressure range Additional uncertainty with temperature [% FS/10K] 985VM Further pressure ranges on request. Order matrix Offset calibration Configurable pressure range manual automatic Unit of display Output signal and version Display Electrical connection 50 Pa 100 Pa 250 Pa 500 Pa 1000 Pa 5000 Pa 10 kPa Volume Flow Flow Velocity 0 ... 10 V or 4 ... 4 ... 20 mA or 0 with LED-display via plug-in terminals via circular connector M12 / 4-pole Factory settings printed in bold type. ( 0.5 mbar) only available as 985VA ( 1.0 mbar) ( 2.5 mbar) ( 5.0 mbar) ( 10 mbar) ( 50 mbar)...

 Open the catalog to page 3
Beck. Transmitter 985V for Volume Flow or Flow Velocity-4

985V_data_english 7021-5 Technical data subject to change without prior notice. Configuration of volume flow or flow velocity 1. Jumper 1 open: Select a calculation formula and enter the k-factor. This procedure is used when the k-factor is known. The k-factor can be found, for example, in documentation provided by the manufacturer of the ventilator or the probe. Use the menu guide on the device for configuration. 2. jumper 1 closed: Creating reference volume flow or flow velocity. Create a reference volume flow or flow velocity to configure the device without selecting a formula and without...

 Open the catalog to page 4
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