Barksdale BFS-10-O Instrucciones de uso - Página 3

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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.
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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.
Limiting the current by means of a
resistor
Limiting the current by means of a
resistor of heating of the filament.
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