29
Caution for safety
DIGITAL FLOW SENSOR
( INSTRUCTION MANUAL )
DANGER
Danger indicates high level of risk, will lead to fatal or serious injuries if not avoided.
WARNING
Warning indicates medium level of risk, it might cause death or serious injuries.
CAUTION
Caution indicates low level of risk, it might result in minor injuries, such as scald, electric shock, etc. and the
product, equipment and machines might be damaged.
This section indicate the levels of risks with the labels of Danger, Warning and Caution.
Precautions for use
1
Operated within the specified voltage.
Malfunction or damaged product, electric shock or fire may be
resulted by exceeding the specified voltage range.
2
Do not exceed the maximum load current.
It may damage the product.
3
Do not use any load that generates surges.
Surge protection is present but applying surge voltage
repeatedly will ultimately damage the product.
When using with inductive load (such as relay or solenoid),
please install a flyback diode across the load (polarity must be
observed).
4
Observed the internal voltage drop.
When used at a specified voltage, if the sensor is functional
but the load does not work, please check if the operating
voltage of the load meets the following formula.
Power Supply >
voltage
Internal voltage >
drop of sensor
Minimum operating
voltage of load
5
Do not operate the product outside the specifications.
The sensor will be damaged by exceeding the flow rate and
working pressure.
6
Do not use flammable fluids and/or permeable fluids.
They may cause fire, explosion or corrosion.
Working fluid and working environment
1
Do not use in an explosive gas atmosphere.
The sensor does not have explosion-proof structure, fire,
explosion or corrosion can result.
2
Do not use near a surge voltage generated area.
Solenoid lifters, high frequency induction furnaces and motors,
etc. can generate high surge voltages, if using near the sensor
will cause the internal circuit components to deteriorate and
cause damages.
3
Sensors can not withstand lightning strikes.
The product is CE compliant, but can not resist surge voltage
of lightning strikes, take measures to avoid lightening strikes in
the system.
WARNING
4
Do not use in an environment where sensors could be
splashed by water or oil.
Enclosure rating is IP40, please avoid water or oil splashed
environment to prevent adversely effects.
5
Do not use in an environment subject to large temperature
cycling.
Internal components of the sensor will be affected adversely
by large heating/cooling cycles other than ordinary changes in
temperature.
6
Do not mount the product in locations where it is exposed
to radiant heat.
This could result in damage and / or malfunction.
Wiring Precautions
1
Check wire color and terminal number when wiring.
Incorrect wiring can cause permanent damages to the sensor,
check wire color and terminal number against the manual
before wiring.
2
Avoid repeatedly bending or stretching the lead wire.
It can cause damage to the sheath, or breakage of the wire.
3
Confirm wiring insulation
Please avoid poor insulations (and interference from another
circuit, poor insulation between terminals, etc.) it can lead to
over current being applied to the product, causing damage.
4
Do not route wires and cables together with power or high
voltage cables.
The product may malfunction due to interference or noise and
surge voltage from power and high voltage cables.
5
Do not short-circuit the load.
When the load is short-circuited, an error will be displayed.
But excess current may cause damage to the sensor.
6
Do not connect wire when the power is on.
It may cause damages to the sensors/equipment/machines.
7
RS485 products must be connected the communication
wire first.
To prevent product damage due to short circuit, MUST do
RS485 line connection BEFORE power line connection.
