Burkert Type 8750 Flow Rate Controller for Gases

จุดเด่นของ Type 8750

Reliable and automated flow control on site
Stable control of the set point, independent on pressure fluctuations
Programmable alarm functions (pressure monitoring)
Simple start-up by manual setpoint setting and display
Leckage air compensation programmable for dense phase conveying systems

หมวดหมู่: Mass Flow Controllers

คำอธิบาย

Flow rate controller for gases

The flow rate controller type 8750 represents a closed flow control loop to measure and control gases using the differential pressure principle. The reliable and robust system consists of an ELEMENT control valve, type 2301, the compact process controller type 8693 put on top of the valve and two pressure transmitters, type 8325. The Bürkert flow rate controller does not need a separate flow meter. The valve seat serves as variable orifice. From the pressure difference across the valve and the given density and temperature a volume flow, referring to the conditions programmed, can be calculated. For that the process controller uses the flow characteristics of the valve and the scales of the pressure transmitters programmed. The volume flow set can then be adjusted by changing the stroke of the control valve. The flow rate controller offers a high repeatability and large measuring range. Beneficial is that the control itself is used for both, controling the flow and measuring over an orifice. With the variable orifice of the control valve the measurement range is increased significantly. Low assembly costs and easy commissioning are further advantages of this unique product.

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type 8750

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General Technical Data

Product properties
Dimensions	Detailed information can be found in chapter “4. Dimensions” on page 6.
Materials	Detailed information can be found in chapter “2. Materials” on page 4.
Design	Globe control valve with integrated flow measurement and control
Nominal diameter	DN 15…DN 100
Port connection	Flange according to DIN EN 1092 – 1, ANSI B 16.5 or JIS 10K
Safety setting in case of power failure	Closed (Control function A)
Flow direction	Against closing direction (under seat)
Performance data
Operating pressure	Valve: 0 bar(g)…16 bar(g)
Nominal pressure (max.)	PN 25 (DIN EN 1333), Class 150 (DIN EN 1759)
Pilot pressure	5.5…7 bar (actuator M, N, P, see “ELEMENT version, actuator M (70 mm), N (90 mm), P (130 mm)” on page 4) 5…6 bar (actuator L, see “CLASSIC version, actuator L (225 mm)” on page 5) Optional on request: version for reduced control pressure from 3.5 bar
Seat leakage acc. to DIN EN 60534 – 4	Leakage class VI for PTFE (soft sealing)
KVS values	2.1 m³/h…140 m³/h, see “5.1. Fluidic data” on page 8
Operating characteristic	Linear or equal percentage
Theoretical range ability	Up to 50:1
Flow rate measurement
Measured variable	Volume flow, reference conditions programmable
Measuring principle	Differential pressure via orifice plate and pressure transmitter on the inlet and outlet side of the orifice plate
Pressure measurement ranges	0…100 mbar to 0…16 bar
Pressure measuring principle	Piezoresistive
Pressure measuring error	≤ 0.5 % of full scale
Electrical data
Operating voltage	24 V DC ± 10 %
Max. residual ripple	0.1
Electrical connection	Operating voltage: circular connector M12x1, 4 pin Analogue input/output signals (for setpoint and actual value): circular connector M12x1, 8 pin Additionally for Bus communication: M12x1, 5 pin Internal signals (for connecting the pressure transmitters): circular connector M8x1, 4 pin
Communication/signal interface	Analogue (4…20 mA, 0…10 V) or digital (PROFIBUS DP)
Medium data
Medium	Air, oxygen, nitrogen, carbon dioxide, neutral gases, fuel gases
Medium temperature	– 10…80 °C
Control medium	Air or neutral gases acc. to DIN ISO 8573 – 1: dust Cl. 7 (< 40 µm), particle density Cl. 5 (< 10 mg/m³), pressure dew point Cl. 3 (≤ 20 °C), oil conc. Cl. X (< 25 mg/m³)
Process/Port connection & communication
Pilot air ports	Threaded connection G ⅛, stainless steel
Approvals and certificates
Approval	Explosion protection: ATEX for zone 3G on request
Conformity	Materials in contact with medium conform to EG1935/2004 and FDA Oxygen conformity for DN 15 (up to + 60 °C) on request Fuel gases (seals according to EN549)
Certificate	2.2 or 3.1 certificate on request
Environment and installation
Ambient temperature	0…55 °C
Degree of protection	IP65 / IP67 acc. to EN 60529

*For selecting thecorrect product please refer to the technical data, images and notes for proper use according to the data sheet, or contact Flu-Tech directly.