Beck. Transmitter 985-Modbus with IP65 for Differential Pressure and Volume Flow / Flow Velocity

Product catalog summary

General Description: The 985-Modbus series transmitters are designed for measuring differential pressure, volume flow, flow velocity, and pressure. They feature a Modbus RTU data interface for outputting measured values and device parameterization.

Applications: These transmitters are suitable for monitoring gaseous, non-combustible, and non-aggressive media. Common applications include building automation, air conditioning systems, clean room overpressure measurement, VAV applications, and dynamic filter and ventilator monitoring.

Communication: The Modbus digital signal allows direct connection to control and regulating systems.

Configuration: Users can configure volume flow or flow velocity measurement by selecting a calculation formula and entering a k-factor or by creating a reference volume flow or velocity. The Modbus interface is used for device settings.

Features: Adjustable response time via Modbus, easy offset calibration, and a red LED display for pressure, volume flow, or flow velocity. The device can be mounted in any position, with zero offset calibration eliminating position errors.

Technical Specifications:

Supply Voltage: 18-30 VAC/VDC
Measuring Method: Piezoresistive pressure transducer
Medium: Air and non-combustible, non-aggressive gases
Display: Red, 4 digits
Units: Pressure (Pa or mbar), Volume flow (m3/h, m3/s, cfm, l/s), Flow velocity (m/s, ft/min)
Output Signal: Digital, Modbus RTU
Interface: RS-485
Baud Rate: 9600-115200 Bd
Maximum Current Draw: <230 mA
Temperature Range: -20 to 70°C (985M and 985VM), -10 to 50°C (985A and 985VA)
Linearity: ≤ ±0.5% FS
Uncertainty: ±1% FS
Long-term Stability: ≤ ±1% FS
Humidity: 0-95% relative, non-condensing
Response Time: 0.2-10 s
Process Connection: 4/6 mm hose connection
Electrical Connection: Plug-in terminals for wires and strands up to 1.5 mm²
Housing: ABS, approx. 81 x 83 x 41 mm, approx. 140 g
Protection Class: IP65
CE Conformance: EMV and RoHS Directives

Pressure Ranges: Various models offer different pressure ranges, overload capacities, and bursting pressures, with additional uncertainty due to temperature effects.

Order Matrix: Options for offset calibration (manual or automatic), configurable pressure ranges, pressure units, data interface, display type, and electrical connection are available.

Accessories: Climaset® kits with hoses and pipes, duct connecting pipes, angled metal pipes, rubber grommets, and rolls of PVC or silicone hose are available.

Catalog excerpts

Beck. Transmitter 985-Modbus with IP65 for Differential Pressure and Volume Flow / Flow Velocity

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General description The transmitters of the 985-Modbus series are used to measure differential pressure, volume flow or flow velocity and pressure. The measured value can be output and the parameterization on the device can be done via the Modbus RTU data interface. Applications Monitoring of gaseous, non-combustible and non-aggressive media. Possible usage areas are: • Building automation and air conditioning systems • Overpressure measurement in clean rooms and laboratories • Measurement of constant pressure in VAV applications • Dynamic filter and ventilator monitoring Communication The digital...

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Beck. Transmitter 985-Modbus with IP65 for Differential Pressure and Volume Flow / Flow Velocity-3

Pressure ranges Model Pressure range Overload Bursting Additional uncertainty with capacity pressure temperature [% FS/10K] Order matrix Offset calibration manual Configurable pressure range only available as 985A-Mod only available as 985A-Mod Pressure unit Data Interface Display Electrical connection mbar Pa Modbus RTU (RS-485) with LED-display via plug-in terminals Transmitter 985Vx-Mod for Volume Flow or Flow Velocity Pressure ranges Model Pressure range Overload Bursting Additional uncertainty with capacity pressure temperature [% FS/10K] ( 0.5 mbar) ( 1.0 mbar) ( 2.5 mbar) ( 5.0 mbar) (...

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Beck. Transmitter 985-Modbus with IP65 for Differential Pressure and Volume Flow / Flow Velocity-4

985-Modbus_data_english 7023-4 Technical data subject to change without prior notice. Duct connection for Climaset® 6550/6556 Climaset® 6555/6557 Terminal assignments Accessories Climaset® consisting of 2m PVC hose and 2 plastic pipes Climaset® consisting of 2m Silicone hose and 2 plastic pipes Climaset® consisting of 2m PVC hose and 2 angled metal pipes Climaset® consisting of 2m Silicone hose and 2 angled metal pipes Duct connecting pipe for Climaset® 6555 Angled metal pipe for Climaset® 6550 Rubber grommet for Climaset® 6550 Roll with 100 m PVC hose Roll with 100 m Silicone hose Artikel-Nr....

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