Burkert 8709 User Manual [en, de, fr]

Type 8718 / 8719

LFC, Liquid Flow Controller

Type 8708 / 8709

LFM, Liquid Flow Meter

		Type 8719	Type 8718
			Type 8708
		Type 8709

Operating Instructions

Bedienungsanleitung Manuel d‘utilisation

We reserve the right to make technical changes without notice. Technische Änderungen vorbehalten.

Sous resérve de modification techniques.

© 2009 Bürkert Werke GmbH & Co. KG

Operating Instructions 0910/01_EU-ML_00805765

Type 8718, 8719 / 8708, 8709

LFC, Liquid Flow Controller Type 8718, 8719

LFM, Liquid Flow Meter Type 8708, 8709

Contents
1.	Operating Instructions........................................................................................................................................................		6
	1.1.	Symbols.......................................................................................................................................................................................	6
2.	Authorized use..............................................................................................................................................................................		7
	2.1.	Restrictions................................................................................................................................................................................	7
	2.2.	Predictable Misuse................................................................................................................................................................	7
3.	Basic Safety Instructions..................................................................................................................................................		8
4.	General Information................................................................................................................................................................		9
	4.1.	Scope of Supply......................................................................................................................................................................	9
	4.2.	Warranty.......................................................................................................................................................................................	9
	4.3.	Trademarks................................................................................................................................................................................	9
	4.4. Information on the Internet............................................................................................................................................		10
5.	System Description.................................................................................................................................................................		11
	5.1.	General Description...........................................................................................................................................................	11
		5.1.1. LFC, Liquid Flow Controller..................................................................................................................	11
		5.1.2. LFM, Liquid Flow Meter..........................................................................................................................	11
	5.2.	Functions.................................................................................................................................................................................	11
		5.2.1. Function of the LFC, Liquid Flow Controller.....................................................................................	11
		5.2.2. Function of the LFM, Liquid Flow Meter.............................................................................................	12
		5.2.3. Function of the sensor............................................................................................................................	12
		5.2.4. Control electronics..................................................................................................................................	13
	5.3.	Proportional valve...............................................................................................................................................................	15
6.	Technical Data.............................................................................................................................................................................		16
	6.1. Labels on the device..........................................................................................................................................................		16
		6.1.1. Inscription on the rating plate / calibration plate..............................................................................	16
	6.2.	Operating Conditions........................................................................................................................................................	17

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	6.3. Conformity with the following standards................................................................................................................			17
	6.4.	Mechanical Data...................................................................................................................................................................		18
	6.5.	Installation dimensions....................................................................................................................................................		19
	6.6.	Fluidic Data.............................................................................................................................................................................		25
	6.7.	Electrical Data.......................................................................................................................................................................		25
7.	Installation and Start-up.................................................................................................................................................			27
	7.1.	Safety instructions..............................................................................................................................................................		27
	7.2. Procedures prior to installation...................................................................................................................................			27
	7.3. Sequence of the steps to be performed................................................................................................................			28
	7.4.	Fluid Installation...................................................................................................................................................................		28
	7.5.	Electrical Installation.........................................................................................................................................................		29
		7.5.1. Setting the bus address on devices without rotary switch for setting the address.................		30
		7.5.2. Setting the bus address on devices with rotary switch for setting the address
			(Types 8718 / 8708)...............................................................................................................................	30
		7.5.3.	Pin assignment.........................................................................................................................................	31
8.	Operation and function.....................................................................................................................................................			34
	8.1.	Safety instructions..............................................................................................................................................................		34
	8.2. Operation of the LFC / LFM...........................................................................................................................................			34
		8.2.1.	LEDs...........................................................................................................................................................	35
		8.2.2.	Inputs/Outputs.........................................................................................................................................	35
	8.3. Functions of the LFC / LFM...........................................................................................................................................			38
		8.3.1.	Standard control mode...........................................................................................................................	39
		8.3.2.	Autotune function.....................................................................................................................................	39
		8.3.3.	Safety function..........................................................................................................................................	40
		8.3.4.	Set-point value profile.............................................................................................................................	40
		8.3.5.	Control mode............................................................................................................................................	40
9.	Maintenance, Troubleshooting.................................................................................................................................			41
	9.1.	Safety instructions..............................................................................................................................................................		41
	9.2.	Maintenance Work..............................................................................................................................................................		41
		9.2.1. Maintenance when operating with highly soiled fluids....................................................................		42
		9.2.2. Cleaning and recalibration at the factory...........................................................................................		43
	9.3.	Malfunctions...........................................................................................................................................................................		43

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10.	Accessories / Spare parts..............................................................................................................................................	45
	10.1. Accessories............................................................................................................................................................................	45
	10.1.1. Electrical accessories.............................................................................................................................	45
	10.1.2. Fluid accessories.....................................................................................................................................	46
	10.1.3. Mass Flow Communicator (PC software)..........................................................................................	46
	10.1.4. Documentation.........................................................................................................................................	47
	10.2. Spare parts.............................................................................................................................................................................	47
11.	Shutdown.........................................................................................................................................................................................	48
	11.1. Safety instructions..............................................................................................................................................................	48
	11.2. Removal of the LFC / LFM..............................................................................................................................................	48
12.	Packaging, Storage, Transport.................................................................................................................................	49
	12.1. Packing, Transporting........................................................................................................................................................	49
	12.2. Storing.......................................................................................................................................................................................	49
13.	Returning the device............................................................................................................................................................	50
14.	Disposal.............................................................................................................................................................................................	51

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Operating Instructions

1.Operating Instructions

The operating instructions describe the entire life cycle of the device. Keep these instructions in a location which is easily accessible to every user and make these instructions available to every new owner of the device.

Warning!

The operating instructions contain important safety information!

Failure to observe these instructions may result in hazardous situations.

• The operating instructions must be read and understood.

1.1.Symbols

Danger!

Warns of an immediate danger!

• Failure to observe the warning result in a fatal or serious injury.

Warning!

Warns of a potentially dangerous situation!

• Failure to observe the warning may result in serious injuries or death.

Caution!

Warns of a possible danger!

• Failure to observe this warning may result in a medium or minor injury.

Note!

Warns of damage to property!

• Failure to observe the warning may result in damage to the device or the equipment.

indicates important additional information, tips and recommendations.

refers to information in these operating instructions or in other documentation.

→→designates a procedure which you must carry out.

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Authorized use

2.Authorized use

Non-authorized use of the LFC / LFM Types 8718, 8719 / 8708, 8709 may be a hazard to people, nearby equipment and the environment.

•The LFC Types 8718 and 8719 are designed for controlling the flow-rate of clean and low-viscosity liquids.

•The LFM Types 8708 and 8709 are used exclusively for measuring the flow-rate of clean and low-viscosity liquids.

•Only the fluids stated on the rating plate and on the calibration protocol may be used for operation.

•If used outdoors, the device must be protected from the elements. Protect against humidity and direct sunlight and observe the permitted ambient temperature.

•During use observe the authorized data and operating conditions specified in the contract documents and operating instructions, as well as the range of applications described in Chapter 5.1. .

•Correct transportation, storage and installation, and careful use and maintenance, are essential for reliable

and faultless operation.

• Use the device only as intended.

2.1. Restrictions

If exporting the system/device, observe any existing restrictions.

2.2. Predictable Misuse

• The LFC / LFM Types 8718, 8719 / 8708, 8709 must not be used for controlling / measuring the flow-rate of fluids containing particles (particle size > 20 µm).

• Do not operate the device without the stainless steel mesh filter disc installed at the factory.

• Do not feed any other fluids into the system other than the designated operating fluid indicated on the device type plate.

Exception: Agent for cleaning and decontaminating the device (see also Chapter 9.2.1. ).

In doing so, observe the resistance of the materials used in the device. The Chemical Resistance Chart can be found on the Internet at:

www.burkert.comDocumentationBrochures & Catalogues If in doubt, contact the manufacturer.

• Do not operate the device in an mounting position which deviates from the calibration conditions.

• Do not put any loads on the housing (e.g. by placing objects on it or standing on it).

• Do not make any modifications to the device housings. Do not paint the housing parts or screws.

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Basic Safety Instructions

3.Basic Safety Instructions

These safety instructions do not make allowance for any

•contingencies and events which may arise during the installation, operation and maintenance of the devices.

•local safety regulations – the operator is responsible for observing these regulations, also with reference to the installation personnel.

Danger – high pressure!

• Before loosening the lines and valves, turn off the pressure and vent the lines.

Risk of electric shock!

• Before removing covers, switch off the power supply and secure to prevent reactivation!

• Observe applicable accident prevention and safety regulations for electrical equipment!

Danger from escaping operating fluid!

• If contact is made with the operating fluid and its reaction products, including in vapor form (touching, inhaling), there is an acute risk of injury.

• Observe applicable accident prevention and safety regulations for the operating fluids used.

General hazardous situations.

To prevent injury, ensure that:

• The system cannot be activated unintentionally.

• Installation and repair work may be carried out by authorized technicians only and with the appropriate tools.

• After an interruption in the power supply or fluid supply, ensure that the process is restarted in a defined or controlled manner.

• The device may be operated only when in perfect condition and in consideration of the operating instructions.

• The general rules of technology apply to application planning and operation of the device.

Note!

Electrostatic sensitive components / modules!

The device contains electronic components which react sensitively to electrostatic discharge (ESD). Contact with electrostatically charged persons or objects is hazardous to these components. In the worst case scenario, they will be destroyed immediately or will fail after start-up.

•Observe the requirements in accordance with EN 61340-5-1 and 5-2 to minimize or avoid the possibility of damage caused by sudden electrostatic discharge!

•Also ensure that you do not touch electronic components when the power supply voltage is present!

The LFC / LFM Types 8718, 8719 / 8708, 8709 were developed with due consideration given to the accepted safety rules and are state-of-the-art. Nevertheless, dangerous situations may occur.

Failure to observe this operating manual and its operating instructions as well as unauthorized tampering with the device, release us from any liability and also invalidate the warranty covering the devices and

8accessories!

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General Information

4.General Information

4.1.Scope of Supply

Check immediately upon receipt of the delivery, that the contents are not damaged and that the type and scope agree with the delivery note and packing list.

If there are any discrepancies, please contact us immediately.

Germany

Contact address:

Bürkert Fluid Control Systems

Sales Center

Chr.-Bürkert-Str. 13-17

D-74653 Ingelfingen

Tel. + 49 (0) 7940 - 10 91 111

Fax + 49 (0) 7940 - 10 91 448

E-mail: [e-mail]

International

Contact addresses can be found on the final pages of the printed operating instructions.

And also on the internet at:

www.burkert.comBürkertCompanyLocations

4.2. Warranty

This document contains no promise of guarantee. Please refer to our general terms of sales and delivery. The warranty is only valid if the LFC / LFM Types 8718, 8719 / 8708, 8709 are used as intended in accordance with the specified application conditions.

The warranty extends only to defects in the LFC / LFM Types 8718, 8719 / 8708, 8709 and its components.

We accept no liability for any kind of collateral damage which could occur due to failure or malfunction of the device.

4.3.Trademarks

The brands listed below are trademarks of the corresponding companies / associations / organisations

PROFIBUS	PROFIBUS Nutzerorganisation e. V.
DeviceNet	ODVA Open DeviceNet Vendor Association
CANopen	CiA CAN in Automation

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General Information

4.4.Information on the Internet

Operating instructions and data sheets for Types 8718, 8719, 8708 und 8709 can be found on the Internet at: www.burkert.comDocumentationType

The complete documentation is also available on CD which can be ordered by quoting part no. 804 625.

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System Description

5.System Description

5.1.General Description

The LFC / LFM Types 8718, 8719 / 8708, 8709 are devices for controlling or measuring the flow-rate of liquids in process technology.

The devices are specified for the control and measurement of low flow-rates.

5.1.1.LFC, Liquid Flow Controller

The actual flow-rate value supplied by the integrated sensor is compared in the digital control electronics with the set-point flow-rate value specified, via a standard signal or field bus. The actual flow-rate value is also available as an output, via a standard signal or field bus.

If there is a control deviation, the actuating variable output to the proportional valve is modified via a control algorithm. As a result, the actual flow-rate is adjusted to the set-point value and the flow-rate can be held on a fixed value or follow a predefined profile sequence, irrespective of pressure changes or other disturbances in the system.

A low-friction proportional valve with a high response sensitivity is used as an actuating element.

5.1.2. LFM, Liquid Flow Meter

The actual flow-rate value supplied by the integrated sensor is available as an output, via a standard signal or field bus.

5.2. Functions

5.2.1. Function of the LFC, Liquid Flow Controller

The LFC Types 8718 and 8719 are compact devices for controlling the flow-rate of liquids.

They correct a stipulated set-point flow-rate value independently of disturbance variables, such as pressure fluctuations or fluctuating flow resistance, e.g. due to filter soiling.

The Liquid Flow Controller consists of the following components:

• Flow sensor (Q sensor),

•Control electronics (with signal processing, control and valve actuation functions),

•Proportional solenoid valve as an actuating element.

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System Description

xout

		y
w	xd = w-x
	x	Control
p		electronics
	Q sensor	Actuating element
		(proportional valve)

Fig. 1: Components of the Liquid Flow Controller

Operating mode

The set-point default value (w) is implemented electrically via a standard signal or a field bus. The actual value (x) measured by the sensor is compared with the set-point value in the controller.

The controller supplies the actuating element with a pulse-width modulated voltage signal as an actuating variable. The pulse-duty factor of the voltage signal is varied according to the established control deviation.

The actual value is also supplied externally as xout via an analogue electrical interface or a field bus and is available to the user for monitoring purposes or other evaluations (e.g. consumption determination by integration).

5.2.2. Function of the LFM, Liquid Flow Meter

The LFM Types 8708 and 8709 lack the proportional valve component, compared to the corresponding LFC Types 8718 and 8719.

The devices can therefore only measure the flow-rate and not correct it independently.

The properties of the other components, in particular the sensor described below, are identical to those of the LFC Types.

5.2.3. Function of the sensor

The flow-rate is measured according to the differential pressure method.

A measuring orifice in the main duct generates a pressure drop in a flow-rate from p1 to p2; this pressure drop is measured by the differential pressure sensor (see Fig. 2: Flow-rate measurement; Differential pressure method). The differential pressure sensor, constructed from two individual pressure measuring cells, supplies a precise and temperature-compensated measuring signal which is used to calculate the flow-rate.

Irrespective of the control status, the flow-rate value measured by the sensor is sent via a standard analogue signal output or digitally via the field bus.

To maintain a dynamic or quiet actual value output signal, the damping of the output signal can be changed with the "Mass Flow Communicator" software (see chapter 10.1.3. Mass Flow Communicator (PC software)) .

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System Description

p1

p2

Fig. 2: Flow-rate measurement; Differential pressure method

Properties of the differential pressure method

• This measuring method has very short response times and therefore also allows very short sampling rates by the control electronics.

• The measurement occurs statically, no moving parts are required in the fluid.

5.2.4. Control electronics

Microprocessor electronics process the current set-point and actual flow-rates and control the actuating element.

The sensor signal is processed by the control electronics and is converted by the calibration curve stored in the device into a value corresponding to the actual flow-rate.

To control critical processes, where quick flow-rate changes are not permitted, a ramp function can be activated via the "Mass Flow Communicator" software (see Chapter 10.1.3. Mass Flow Communicator (PC software)). In doing so, the parameters for an ascending and a descending set-point value can be set separately.

More detailed information on the ramp function and on all other functions can be found in the software documentation for the LFC / LFM.

Control deviation:
Control deviation	=	Set-point value	–	Actual value
xd	=	w	–	x

The control deviation is processed according to a PI control algorithm.

The control parameters are set at the factory.

To take account of the properties of the control path, the controller operates with path-dependent amplification factors. When the autotune function runs, these are determined automatically.

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System Description

Control parameters:

The device has a stored parameter which can change the control dynamics with the aid of the "Mass Flow Communicator" software (see Chapter 10.1.3. Mass Flow Communicator (PC software)). Its extreme effects are

1.a very quick adjustment in which overshoots are accepted,

2.a slower adjustment to the required flow-rate.

The former may result in the controller responding immediately to very low control deviations, causing the control to be very turbulent.

If the process is less dynamic, the behaviour of the controller may be damped so that minor fluctuations of the actual value or set-point value are adjusted slowly.

Actuating variable:

The actuating variable is available as a pulse-width modulated (PWM) signal to the proportional valve. The frequency of this signal is adjusted depending on the valve used.

The pulse-duty factor of the PWM signal is used as an actuating variable.

The pulse-duty factor is the quotient of the switch-on time and the cycle duration.

The greater the switch-on time, i.e. the longer the valve coil is actuated, the greater the average coil current. The coil current is the cause of the resulting magnetic field in the coil.

A greater coil current results in a greater magnetic field, which increases the valve's magnetic force, which finally moves the valve armature (also known as valve core) up against a spring force.

Correction time:

An overall brief correction time is achieved by the proportional valve responding rapidly as an actuating element and by the brief response time of the measuring element (see Chapter 6.6. Fluidic Data).

Zero point shut-off:

To ensure the sealing function of the valve, a zero point shut-off is integrated. This is activated if the following conditions occur at the same time:

Set-point value < 10% of nominal flow-rate Qnom	and	Actual value < 10% of nominal flow-rate Qnom

If zero point shut-off is active, the PWM signal is set to 0% so that the valve is completely closed.

The valve is a direct-acting, normally closed valve.

A return spring presses the valve armature onto the valve seat and seals it, provided the coil is not actuated, i.e. it cannot generate a magnetic force counteracting the reset force.

A soft seat seal integrated in the valve armature ensures that the valve reliably shuts off the fluid flow.

Set-point value:

The set-point value is specified, according to the device model, either as an analogue signal via the standard signal input or digitally via the serial interface or the field bus interface.

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System Description

5.3.Proportional valve

The LFC uses direct acting, lifting-armature, proportional valves as actuating elements, taken from the Bürkert range of valves.

The low-friction guide of the valve armature ensures (in conjunction with the PWM control) a continuous, mainly linear characteristic, as well as high response sensitivity. Both are important for the optimum functionality of the LFC closed control circuit.

The orifices of the valves are based on the required nominal flow-rate Qnom, the pressure conditions in the application and the density of the operating fluid.

A proportional valve is selected by the manufacturer on the basis of this data, so that the flow-rate coefficient kV of the LFC (according to the flow-rate equations at the specified pressure conditions) allows a maximum flow-rate of at least the required nominal flow-rate Qnom.

If the device is operated within the specified pressure range, the proportional valve simultaneously takes over the sealing function together with the control function.

In the case of special, hard seal materials, the seal function could not be ensured. In this case an additional shut-off valve may be required.

The LFC or LFM is typically calibrated to units which are useful for low flow-rates such as l/h or ml/min.

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Technical Data

6.Technical Data

Caution!

Risk of injury from pressure and discharge of fluid.

Important device-specific technical data is indicated on the rating plate and the calibration plate (see Chapter 6.1.1. Inscription on the rating plate / calibration plate).

•Observe permitted fluid according to rating plate (depending on seal material).

•Observe permitted pressure range on the calibration plate of the device.

6.1.Labels on the device

			Rating plate
		Examples:	Germany	8719 LFC WASSER
				6,0	l/h
				24V DC 0-10V FKM
			in
				S/N 1006
			Made
				00202378		W1XLP
		y	Calibration plate
	German
	in	8719
MadeS/N24V		6,0
	DC	LFC
0 1006		l/h
W1XLP00202378	10V-	WASSER	Calibration
			Date 29. 01. 2009
			Pressure		2.0 bar
			Horizontal mounting position

Fig. 3: Rating plate, calibration plate

6.1.1.Inscription on the rating plate / calibration plate

Example of rating plate

	Germany	8719 LFC WASSER
		6,0 l/h
	in	24V DC 0-10V FKM
		S/N 1006
	Made	00202378							W1XLP

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Type

Brief description of the device Operating fluid

Final value (Qnom) and unit

Power supply voltage, actual value

Seal material

Serial number, CE identification

Bar code

Identification number of the device

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Type 8718, 8719 / 8708, 8709

Technical Data

	Example of calibration plate
	Calibration			Calibration date
	Date 28. 01. 2009
	Pressure	2.0 bar		Calibration pressure
	Horizontal mounting position			Mounting position

6.2.Operating Conditions

Warning!

Risk of injury from malfunction due to effects of weather!

The LFC / LFM is not designed for unrestricted use outdoors.

If the device is not protected from the elements, there is a risk of injury from the device failing.

• Protect the device from direct sunlight.

• Ensure that the ambient temperature permitted for the device is observed.

• Protect the device from humidity in consideration of the protection class indicated below.

Allowable temperatures

Ambient temperature:

Fluid temperature:

Permitted air humidity:

Operating fluids:

Protection class in

accordance with DIN EN 60529:

Operation:	0 – +55 °C
Storage:	-10 – +70 °C

+10 – +40 °C

0 – 95%, without condensation

clean and low-viscosity liquids

Types 8709 and 8719: IP65 (only if cables, plugs and sockets have been connected correctly)

Types 8708 and 8718: IP40

6.3.Conformity with the following standards

CE mark conforms to EMC Directive 2004/108/EEC (previously: 89/336/EEC) (only if cables, plugs and sockets have been connected correctly)

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Technical Data

6.4.Mechanical Data

Mounting position:	horizontal or vertical
	(see calibriation plate / calibration protocol)
Material:	Housing: Types 8709 and 8719: Stainless steel 1.4404
	Types 8708 and 8718: Stainless steel 1.4404
	Cover: Types 8709 and 8719: PTB
	Types 8708 and 8718: PC
Sealing material	FKM, EPDM, FFKM (see rating plate)
Weight:	Types 8709 and 8719: approx. 1200 g (stainless steel)
	Types 8708 and 8718: approx. 1000 g (stainless steel)
Dimensions:
(L x H x W)	Types 8709 and 8719: 115 mm x 137.5 mm x 37 mm
	Types 8708 and 8718: 107 mm x 115.5 mm x 28 mm
	Types 8708 and 8718 with flanged connection: 107mm x 115.5 mm x 43 mm

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Technical Data

6.5.Installation dimensions

LFC Type 8719 and LFM Type 8709:

	M4 - 8 deep
		Dimension A
	23	G 1/4	G 1/8
		NPT 1/4	NPT 1/8
	M4 - 8 deep
	97
137.5
		71
4
		42
A	A	12.5
10	10		37
	115
Fig. 4: Installation dimensions LFC Type 8719 and LFM Type 8709

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Technical Data

LFC Type 8719 and LFM Type 8709, field bus version:

		M4 - 8 deep
			Dimension A
		23	G 1/4	G 1/8
			NPT 1/4	NPT 1/8
		M4 - 8 deep
		97
	16.5
137.5		112
		71
	4
			42
	A	A	12.5
	10	10		37
		115
Fig. 5:	Installation dimensions LFC Type 8719 and LFM Type 8709, field bus version

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Technical Data

LFC Type 8718 and LFM Type 8708:

	2x M4 - 6 deep
			Dimension A
	28	20	G 1/4	G 1/8
			NPT 1/4	NPT 1/8
	87
	4
	115.5
				84
	A	A	12.5
	12	12
	107
	Fig. 6: Installation dimensions LFC Type 8718 and LFM Type 8708

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Technical Data

LFC Type 8718 and LFM Type 8708, with flanged connection:

		M4	58.5
			ø 6
35.5	17.75	28	17.75	35.5
		ø 6
		10	M4
		58.5
			92
			97
		4
	115.5
				84
		8
			107

Fig. 7: Installation dimensions LFC Type 8718 and LFM Type 8708, with flanged connection

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Technical Data

LFC Type 8718 and LFM Type 8708, field bus version:

		2x M4 - 6 deep
			Dimension A
28		20	G 1/4	G 1/8
			NPT 1/4	NPT 1/8
		87
	4
115.5	16.5
				84
				43.5
	A	A
		12.5
	12	12
		107
Fig. 8:	Installation dimensions LFC Type 8718 and LFM Type 8708, field bus version

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Technical Data

LFC Type 8718 and LFM Type 8708, field bus version with flanged connection:

			M4	58.5
				ø 6
35.5	17.75	28		17.75	35.5
			ø 6
			10	M4
				58.5
				92
				97
			4
		115.5	16.5
					84
					43.5
			8
				107

Fig. 9: Installation dimensions LFC Type 8718 and LFM Type 8708, field bus version with flanged connection

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Technical Data

6.6.Fluidic Data

Final value (Qnom):	0.6 – 36 l/h with regard to water (see rating plate / calibration protocol)
Measuring range / control range: 1 : 10
Measuring precision:	± 1.5% o.r. ± 0.5% f.s. (after 15 min. warming up time)
Reproducibility:	± 0.5% f.s.
Correction time (t95%):	< 500 ms
Max. operating pressure:	2 barrel, 6 barrel, 10 barrel,
	according to version depending on the nominal size of the valve and the sensor
	measuring range (for more detailed information see calibration protocol)
Calibration fluid:	Operating fluid or water (see calibration protocol)
Port connections:	G1/4 or NPT1/4
	8708, 8718: also available as flanged connection

6.7.	Electrical Data
Power supply:		24 V DC ± 10% residual ripple < 2%
Power consumption:		8718 and 8719: max. 7.5 W
		for field bus version max. 10 W
		8708 and 8709: max. 2.5 W
		for field bus version max max. 5 W
Inputs:
	Set-point value:	Standard signal 0/4 – 20 mA
		max. input impedance: 300 Ω
		Resolution: 5 µA
		Standard signal 0 – 5/10 V
		min. input impedance: 20 kΩ
		Resolution: 2.5 mV
	Binary input:	Low-active, for activation connect to DGND (for binary inputs)
		(assignment can be configured)

8709 and 8719: 3 binary inputs

8708 and 8718: 2 binary inputs

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Type 8718, 8719 / 8708, 8709

Technical Data

Outputs:

Actual value:	Standard signal 0/4 – 20 mA
	max. burden: 600 Ω
	Resolution: 20 µA
	Standard signal 0 – 5/10 V
	max. current: 10 mA
	Resolution: 10 mV
Binary output:	potential-free changers 60 V, 1 A, 60 VA (assignment can be configured)
	8709 and 8719: 2 binary outputs
	8708 and 8718: 1 binary output

Display:

Light-emitting diodes: Status display for Power, Communication, Limit, Error (assignment can be configured)

8709 and 8719: 4 LEDs

8708 and 8718: 3 LEDs

Field buses:	alternative to the standard signal version
	PROFIBUS DP V1
	DeviceNet
	CANopen
Electrical connections:	8719 and 8709:
	8-pole round socket
	15-pole Sub-HD socket
	optional: 5-pole M12 socket or plug for field bus
	8718 and 8708:
	15-pole Sub-D plug
	optional: 5-pole M12 socket or plug for field bus

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Type 8718, 8719 / 8708, 8709

Installation and Start-up

7.Installation and Start-up

7.1.Safety instructions

DANGER!

Risk of injury from high pressure in the equipment!

• Before loosening the lines and valves, turn off the pressure and vent the lines.

Danger from escaping operating fluid!

If contact is made with the operating fluid and its reaction products, including in vapor form (touching, inhaling), there is an acute risk of injury.

• Observe applicable accident prevention and safety regulations for the operating fluids used.

Risk of injury due to electrical shock!

• Before removing covers, switch off the power supply and secure to prevent reactivation!

• Observe applicable accident prevention and safety regulations for electrical equipment!

Warning!

Risk of injury from improper installation or improper start-up!

• Installation and start-up may be carried out by authorized technicians only and with the appropriate tools!

Risk of injury from unintentional activation of the system and an uncontrolled restart!

• Secure system from unintentional activation.

• Following installation, ensure a controlled restart.

7.2. Procedures prior to installation

→→Before installing the LFC / LFM, remove dirt from the pipes and fluid system components.

→→Connect a suitable filter (≤ 20 µm mesh size) upstream to ensure that the operating fluid is kept clean.

Note!

During installation observe the following!

•The mounting position according to calibration plate or calibration protocol.

•The use of a power supply unit with adequate power.

•The maximum permitted residual ripple of the operating voltage.

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Type 8718, 8719 / 8708, 8709

Installation and Start-up

7.3.Sequence of the steps to be performed

Install and start-up the LFC / LFM in the described sequence:

1.Mechanical and fluid installation

2.Electrical installation

3.Apply pressure with operating fluid

4.Flush and completely deaerate the lines with operating fluid at calibration pressure

5.Regular operating mode

7.4.Fluid Installation

DANGER!

Risk of injury from high pressure in the equipment!

• Before loosening the lines and valves, turn off the pressure and vent the lines.

Select the available fluid connections suitable for the maximum flow-rate. Inlet paths are not required. If required, the devices can also be supplied with fitted fluid connections.

Warning!

Danger from leaks!

If flow-rates are low and pressures high, ensure that the system is sealed to prevent incorrect metering or the operating fluid from leaking.

• To ensure that the seal is secure, observe the mode of operation described below.

To seal the system properly, install the clamping ring screw joints as follows: →→Fit pipe connections tension-free (if required, use compensators).

→→Use pipe with suitable diameter and smooth surface.

→→Saw the pipe straight and deburr.

→→First push the union, then the support ring (if available) and finally the clamping ring in the stated sequence onto the pipe.

→→Insert the pipe all the way into the screw joint.

→→Tighten union by hand.

→→Counter with a wrench on the screw-in side (do not put pressure on the device housing) and tighten 1 ¼ revolutions.

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Type 8718, 8719 / 8708, 8709

Installation and Start-up

Note!

During prolonged operating pauses, drain the fluid out of the LFC / LFM and flush with compressed air. To do this, the device must be actuated so that the valve is open.

• Ensure that the calibration pressure of the device is not exceeded.

Too high a pressure within the LFC / LFM will cause irreparable damage to the device.

7.5.Electrical Installation

DANGER!

Risk of injury due to electrical shock!

• Before removing covers, switch off the power supply and secure to prevent reactivation!

• Observe applicable accident prevention and safety regulations for electrical equipment!

Warning!

Risk of fire and ignition due to electrostatic discharge!

If the device is electrostatically charged, highly flammable fluid vapors may ignite if a discharge occurs.

• To prevent an electrostatic charge, connect the housing to the function earth (FE) via the shortest possible cable length (cross-section as large as possible).

Danger from electromagnetic fields!

If the FE connection is not connected, the conditions of the EMC Law are not being satisfied!

• Connect the housing to the function earth (FE) via the shortest possible cable length (cross-section as large as possible).

Note!

Important information for the problem-free functioning of the device:

The GND or earth cables for all signals of the LFC / LFM must always be fed separately to the LFC / LFM.

If all GND signals are bridged directly on the LFC / LFM and only one common cable is fed to the control, signal displacements and interference of the analogue signals may occur.

→→Connect the function earth (FE) to the indicated screw, e.g. with the aid of a ring tongue.

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Type 8718, 8719 / 8708, 8709

Installation and Start-up

7.5.1.Setting the bus address on devices without rotary switch for setting the address

The bus address of the devices can be set either via the Bürkert configuration tool “Mass Flow Communicator” in "Views" → PROFIBUS / DeviceNet / CANopen or directly via the bus master.

When an address has been changed, it must be re-initialised on the slave and on the master. In doing so, it is necessary, depending on the bus, to send a corresponding telegram.

Recommendation:

To ensure a trouble-free setting, the device should be reset. (Disconnect the device from the power supply).

7.5.2.Setting the bus address on devices with rotary switch for setting the address (Types 8718 / 8708)

When the device is switched on, the address set with the rotary switches is accepted as a slave address.

Valid addresses are: • PROFIBUS	0	– 126
• DeviceNet	0	– 63
• CANopen	1	– 127

If the address was set outside the permitted range, the address setting has the validity as described in Chapter 7.5.1. .

LSB		Unit position	Digit times 1
Unit position (x 1)		0 – 9	0 – 9
MSB		Tens position	Digit times 10
Tens position		0 – 9	0 – 90
		A	100
(x 10)
		B	110
		C	120
		D	130
		E	140
		F	150
The address is composed of LSB + MSB
Example:
Address	MSB setting		LSB setting
1	0		1
63	6		3
100	A		0
127	C		7

Fig. 10: Setting the bus address on devices with rotary switch (Types 8718 / 8708)

If an address setting is required using the available rotary switches via the bus master, this can be implemented by setting an address outside the valid range.

A change to the bus address via the rotary switches does not become effective until the device is restarted.

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