Flow Sensor
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http://www.pisco.co.jp
Please be sure to read before handling the product. Please refer to "safety instructions", "common safety instructions for products listed in this manual", "common safety instructions for flow controller" from page 24 through 35.
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Common Safety Instructions for Products Listed in This Manual
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Usage and Maintenance
Warnings
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Output accuracy is affected by self-heating caused by energizing other than temperature characteristics. At the time of usage, stand-by
time (over 5 minutes after energization) must be provided.
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For self-diagnosis, this product does not conduct flow rate detecting switch operation for about 4 seconds immediately after energized.
Please make a control circuit and programs to ignore signals for about 4 seconds after energized.
Cautions
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When an error occurs during operation, please turn off power supply immediately, and terminate the operation, and contact to the sales
office.
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Use the product within range of rated flow.
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Use the product within range of working pressure.
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When changing set points of the output, please stop the equipment, then change the set points, or an accident may occur.
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A periodic inspection should be done at least once a year, then please make sure that the product be operated properly.
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Disassembly and modification must not be done or causing a failure.
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The material of case is resin. Solvent/alcohol/cleaner, etc., must not be used to remove contamination, etc., or causing a resin to be
corroded. Please wipe with diluted neutral detergent by tightly squeezed waste cloth, etc.
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Please be careful of reverse current by disconnection/wiring resistance. If other components including other flow sensors are
connected to the same power source of the sensor, when switch output line and "-" side of power line are short-circuited to check
operation of input device in the control panel, or if "-" side of power line is disconnected, reverse flow in switch circuit may cause
damage.
Current
from other
components
Test SW or Short circuit
Disconnection
Flow sensor
Control panel
Reverse current
prevention diode
Main Circuit
Other components
PLC input
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Preventing damage by reverse current, please take the following countermeasures.
(1) Please avoid concentration to "-" side power line, and use the wire as fat as possible.
(2) Please narrow the number of components to connect to the same power source of the sensor.
(3) Please provide a diode on the flow sensor output line in serial to prevent reverse current.
(4) Please provide a diode on "-" side of flow sensor power line to prevent reverse current.