Barksdale BFS-10-N User manual

7.1 Dimensions
BFS-10-N / N-Air
G G 1 G ½ G ¼
hex 41 27 18
D 47 31 18
B 76 52 47
T 17 14 10
L 130 90 65
Weight [g] 1050 350 140
BFS-10-O / O-Air
G G 1 G ½ G ¼
hex 41 27 17
D 50 32 20
B 77 53 49
T 17 14 10
L 158 114 90
Weight [g] 900 300 140
Approval data for BFS-10-...-EXI
Optionally there is an intrinsically safe approved version of the flow monitor for gas and dust
environments according to ATEX regulations.
These intrinsically safe switches marked with Ex ia label must be operated with a certified switch
amplifier.
Approval:
II 1 GD Ex ia IIB T6 Ga
Ex ia IIIC T100°C Da
Certificate no.: ISSeP08ATEX016X/1
Permissible ambient
temperature: Tamb = -40 °C … +75 °C, IP6X
Electrical data for
intrinsically safe application:
Ui= 28 V
Ci = 40 pF
Ii= 50 mA
Li = 4 µH
Standards applied: IEC 60079-0 : 2011, IEC 60079-11 : 2011
All conductive parts that can become dangerously charged must be connected and fed
into the equipotential bonding.
Operating Instructions
Flow monitor type BFS-10-N / N-Air
Flow monitor type BFS-10-O / O-Air
1Intended Applications ................................................................................................... 2
2Safety Instructions......................................................................................................... 2
3Standards ....................................................................................................................... 3
4Warranty/Guaranty......................................................................................................... 3
5Installation ...................................................................................................................... 4
6Maintenance/Cleaning ................................................................................................... 5
7Technical Data................................................................................................................ 6
Barksdale GmbH
Dorn-Assenheimer Straße 27
D-61203 Reichelsheim
Phone: [phone]
Fax: [phone] and 949-113
eMail: [email protected]
Internet: www.barksdale.de
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Art. no. 923-1850
Index: M, 31.01.2019
Specifications are subject to
changes without notice!
Refer to data sheet for further
technical data.

1 Intended Applications
The flow monitor is designed exclusively for measuring and monitoring fluid media, e.g. in cooling
systems, measuring and test equipment and pumps. All non-standard applications should be
discussed with our engineers.
Read the operating instructions and the safety instructions carefully before using the flow monitor.
Nonobservance may cause injuries to health or material damage.
Barksdale GmbH cannot be held liable for any damage resulting from incorrect use.
DANGER
The flow monitor may only be used in the specified fields of application (see nameplate).
The temperatures must be within the specified ranges, the pressure values and the electrical rating
must not exceed the values specified.
Inside the device no explosive mixture (gas/air, dust/air or hybrids) may occur at any time. This is
to be guaranteed by the operator.
Observe also the applicable national safety instructions for assembly, commissioning and operation
of the flow monitor.
2 Safety Instructions
The safety instructions are intended to protect the user from dangerous situations and/or material
damage.
In the operating instructions the seriousness of the potential risk is designated by the following
signal words:
DANGER
Refers to imminent danger to men.
Nonobservance may result in fatal injuries.
WARNING
Refers to a recognizable danger.
Nonobservance may result in fatal injuries, and destroy the equipment or plant parts.
CAUTION
Refers to a danger.
Nonobservance may result in light injuries and material damage to the switch and/or to the plant.
IMPORTANT
Refers to important information essential to the user.
Disposal
The flow monitor must be disposed of correctly in accordance with the local regulations for
electric/electronic equipment.
The flow monitor must not be disposed of with the household garbage!
3 Standards
The standards applied during development, manufacture and configuration are listed in the
CE conformity and manufacturer's declaration.
4 Warranty/Guaranty
Warranty
Our scope of delivery and services is governed by the legal warranties and warranty periods.
Terms of guaranty
We guaranty for function and material of the flow monitor under normal operating and maintenance
conditions in accordance with the statutory provisions.
Loss of guaranty
The agreed guaranty period will expire in case of:
 incorrect use
 incorrect installation
 incorrect handling or operation contrary to the provisions of these operating instructions
No liability is assumed for any damage resulting therefrom, or any consequential damage.
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5 Installation
IMPORTANT
The flow monitor may only be installed and commissioned by trained staff.
The instrument can be installed in any position in a system due to the use of a spring resetting the
float to its initial position. Flow direction is from the lowest to the highest value indicated on the
scale.
IMPORTANT
The medium must be free of solid contamination and magnetic particles.
We recommend the use of dirt filters.
IMPORTANT
The flow monitors must not be positioned in inductive or strong magnetic fields. The screw
connection should be non-magnetic.
All standard connections comply with DIN ISO 228-1. Ensure that only suitable threads and sealing
materials are used for installation, otherwise correct functioning and tightness of the equipment may
be impaired.
To avoid the risk of measuring faults the upstream line should be 10 x D and the downstream line
5 x D (D = nominal diameter of the tube).
The highest accuracy will be reached by installing the flow monitor vertically, with the flow direction
from the bottom to the top. When the flow monitor is installed in any other position, deviations may
occur due to the weight of the float.
CAUTION
BFS-10-N: Too long threads may impair the function of the flow monitor or cause damage
to the flow monitor.
Observe the maximum length when screwing in the fittings.
CAUTION
BFS-10-O: Twisting of the flow monitor fitting inside the aluminium sleeve may cause
leakage or breaking of the glass.
When screwing in the fittings the flow monitor connection must be fixed with a spanner. Use only
suitable tools (fork wrench of correct size) for fixing.
5.1 Connecting the flow monitor
Flow monitor with contact (standard): the electrical connection values stated on the housing should
never be exceeded (not even for short periods). The integrated reed contact is very sensitive to
overload. The danger of overloads exist by means of:
 Inductive loads
 Capacitive loads
 Resistive loads
Inductive load
Inductive loads will be caused by contactors, relais / solenoid valves / electricmotors
CAUTION
Voltage peaks during switch off (up to 10-times of the nominal voltage)
Precautionary measure: (sample)
Capacitive load
This kind of load will be caused by extrem long leads / capacitive consumption
CAUTION
High current peaks during switch on the switch contact (exceeding the nominal current)
Precautionary measure: (sample)
Resistive load
This kind of load will be caused by incandescent bulbs / Motor start up
CAUTION
High current peaks during switch on of the switch contact, because the filament has low resistance
at low temperatures.
Precautionary measure: (sample)
Connection to SPS
For the connection to high resistance devices (like SPS) a protection circuit is not necessary.
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Limiting the current by means of a
resistor of heating of the filament.
Limiting the current by means of a
resistor

The reed contacts are tungsten, gold-rhodium-plated and are installed in an inert gas atmosphere.
Hence direct connection to the inputs of a PLC system is possible.
Wiring diagram for switches provided with connector (standard)
NO contact Change over
5.2 Adjusting the switching point
The switching point is adjusted via the scale on the flow monitor. Please take into account that the
scale always indicates the shut-down point. That means:
 when the flow rate is decreasing the NO (Normaly Open) contact will open when the set volume
is reached
 when the flow rate is sufficient, the NO (Normaly Open) contact is closed
 in case of an alarm (flow rate too low) the NO (Normaly Open) contact will open
6 Maintenance/Cleaning
IMPORTANT
Maintenance of the flow monitor may only be carried out by trained staff.
The flow monitor has only a few moving parts. Maintenance only involves cleaning these parts from
time to time.
7 Technical Data
Operating data BFS-10-N 1" BFS-10-N ½" BFS-10-N ¼"
Pressure MS 250 bar 300 bar 300 bar
Pressure MS with GL 100 bar 100 bar 100 bar
Pressure VA 300 bar 350 bar 350 bar
Pressure drop 0.02 - 0.4 bar 0.02 - 0.3 bar 0.02 - 0.2 bar
Temperature max. 100 °C 100 °C1) 100 °C
Electrical data – only valid for application in non-explosive atmosphere
Normally Open NO 250 V - 3 A - 100 VA 230 V - 3 A - 60 VA 200 V - 1 A - 20 VA
Change over* 250 V - 1.5 A - 50 VA 250 V - 1.5 A - 50 VA 200 V - 1 A - 20 VA
System of protection IP65 IP65 IP65
Materials Brass Stainless steel Brass Stainless steel Brass Stainless steel
Housing Brass 1.4571 Brass 1.4571 Brass 1.4571
Float Brass 1.4571 Brass 1.4571 Brass 1.4571
Spring 1.4571 1.4571 1.4571 1.4571 1.4571 1.4571
Seals none none none none none none
Tolerance ±10% of FS ±10% of FS ±10% of FS
Switch housing with connector acc. to DIN EN 175 301-803-C (formerly DIN 43650-C) or 1 m pre-fitted cable
* Minimum load: 3 VA; contact rating for PLC applications: 200 V, 1 A, 20 VA (Please request)
1) HT: max. medium temperature: + 130 °C, max. ambient temperature: +125 C°
Operating data BFS-10-O 1" BFS-10-O ½" BFS-10-O ¼"
Pressure MS 10 bar 16 bar 16 bar
Pressure VA 10 bar 16 bar 16 bar
Pressure drop 0.02 - 0.4 bar 0.02 - 0.3 bar 0.02 - 0.2 bar
Temperature max. 100 °C 100 °C 100 °C
Electrical data – only valid for application in non-explosive atmosphere
Normally Open NO 250 V - 3 A - 100 VA 230 V - 3 A - 60 VA 200 V - 1 A - 20 VA
Change over* 250 V - 1.5 A - 50 VA 250 V - 1.5 A - 50 VA 200 V - 1 A - 20 VA
System of protection IP65 IP65 IP65
Materials Brass Stainless steel Brass Stainless steel Brass Stainless steel
Housing Aluminum
anodized
1.4571 Brass 1.4571 Brass 1.4571
Float Brass 1.4571 Brass 1.4571 Brass 1.4571
Spring 1.4571 1.4571 1.4571 1.4571 1.4571 1.4571
Seals none none none none none none
Tolerance ±10% of FS ±10% of FS ±10% of FS
Switch housing with connector acc. to DIN EN 175 301-803-C (formerly DIN 43650-C) or 1 m pre-fitted cable
* Minimum load: 3 VA; contact rating for PLC applications: 200 V, 1 A, 20 VA (Please request)
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