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54
Safety Instructions (continued)
Perform proper functional checks and leak tests after
maintenance.
Stop operation when an abnormality is observed such that the flow
sensor does not work properly or there is a leakage of fluid.
Safety is not be assured due to unexpected malfunction.
When leakage occurred from other parts except piping, the flow sensor
might break.
Cut off power supply and stop supplying pressure. Don’t apply pressure
at leaking condition.
Precaution on Handling
Use UL approved product for direct current power supply.
1.Clamping voltage current circuit complies with UL508
Circuit which power supply if insulation transducer satisfying
following conditions
Max. voltage (No load) : 30Vrms (42.4V peak) or less
Max. current : (1) 8A or less (Including short circuit)
(2) When limited by the circuit
protector (fuse etc.) with the ratings in the table
below.
Voltage without load (V peak)
0 to 20 [V]
Over 20 [V] up to 30 [V]
Max. current rating (A)
5.0
100/peak voltage
2.Circuit (of class 2) which is of 30Vrms (42.4V peak) or less with the
power supply unit of class 2 complying with UL1310 or transducer of
class 2 complying with UL1585.
NOTE
Follow the instructions given below when handling the flow
sensor. Otherwise, the flow sensor may be damaged or may
fail, thereby resulting in malfunction.
•Make sure to use a sensor by the specified voltage.
•Make sure to use specified measurement flow and operating pressure.
•Confirm the pressure loss at the sensor according to the flow
characteristic (Pressure loss) graph for designing piping.
•Prepare maintenance space.
•Do not drop or bump, or apply excess impact (490mm/s
2
).
•Do not pull the lead wire forcefully, not lift the product by pulling the
lead wire. (Tensile force 49N or less).
•Mount a sensor by observing the proper tightening torque.
•For piping of the flow sensor, hold the piping with spanner on the metal
part of the piping (Piping attachment).
•Install or connect the flow sensor so that the flow direction specified on
the label matches with actual flow direction.
•Pipe the flow sensor after eliminating dust in piping by air blow to avoid
failure and malfunction.
•Never mount a sensor in a place that will be used as a scaffold during
piping.
•Use dry air which complies with the quality grade of ISO 8573-1 1.1.2 to
1.6.2 : 2001.
•If the entering of foreign material to the fluid is possible, install and pipe
the filter or the mist separator to the inlet to avoid failure and
malfunction.
•Avoid repeatedly bending or stretching the lead wire.
•Wire correctly.
•Do not wire while the power is supplied.
•Do not wire in conjunction with power lines or high voltage lines.
•Confirm proper insulation of wiring.