Series <strong>PFMV</strong>3Specific Product Precautions 6Be sure to read before handling.Refer to front matters 58 and 59 for Safety Instructions and pages 892 to 896 forFlow Switch Precautions.Warning5. Do not short-circuit a load.Although the switch displays an overcurrent error if a load isshort-circuited, there is not protection against incorrect wiring(power source polarity, etc.). Use caution to avoid wiringincorrectly.6. Do not connect wiring while energizing theproduct.The switch and any equipment connected to it could break andmalfunction.WarningWiringOperating Environment1. Never use in the presence of explosive gases.The switch does not have an explosion proof construction. If itis used in an environment where explosive gases are used, itmay cause an explosive disaster. Therefore, never use it insuch an environment.2. Mount the switch in a location where there isno vibration greater than 98 m/s 2 , or no impactgreater than 490 m/s 2 .3. Do not use in an area where surges are generated.When there are units that generate a large amount of surge inthe area around a pressure switch, (e.g., solenoid type lifters,high frequency induction furnaces, motors, etc.) this may causedeterioration or damage to the switch’s internal circuitry. Avoidsources of surge generation and crossed lines.4. Switches are not equipped with surge protectionagainst lightning.The flow switches are CE compliant; however, they are notequipped with surge protection against lightning. Lightningsurge protection measures should be applied directly to systemcomponents as necessary.5. Avoid using the switch in an environmentwhere the likelihood of splashing or sprayingof liquids exists.The switch is an open type and should not be used in an environmentexposed to splashing of water and oil.6. Do not use the product in an environmentsubject to a temperature cycle.If the product is subject to a temperature cycle other than naturalchanges in air temperature, the internal components of theswitch could be adversely affected.7. Do not mount the product in locations whereit is exposed to radiant heat.This could result in damage and/or malfunction.WarningCautionMaintenance1. Perform periodical inspections to ensureproper operation of the switch.Unexpected malfunctions may cause possible danger.2. Take precautions when using the switch foran interlock circuit.When a pressure switch is used for the interlock circuit, devisea multiple interlock system to prevent trouble or malfunction,and verify the operation of the switch and interlock function on aregular basis.3. Do not make any modifications (including exchangingthe printed circuit boards) to theproduct.It may cause human injuries and damage.4. When maintenance work is performed, thefollowing points should be noted.• Turn off the power supply.1. Do not wipe the product with chemicals suchas benzene or thinner.Such chemicals could damage the product.2. Do not touch terminals or connectors whenenergizing the product.It could cause electric shock, malfunction, or damage to theswitch.WarningOthers1. After the power is turned on, the switch’s outputremains off while a message is displayed.Therefore, start the measurement after a valueis displayed.2. Perform settings after stopping control systems.Operation reflects the new values when settings are made.However, if the power is turned OFF in that state, the settingsreturn to the values before the change when the power isturned ON again. Make sure to press the S button to save anysetting changes before turning OFF the power.968
Series <strong>PFMV</strong>3Specific Product Precautions 7Be sure to read before handling.Refer to front matters 58 and 59 for Safety Instructions and pages 892 to 896 forFlow Switch Precautions.CautionSettable Range and Voltage Input RangeThe settable rate range is the range that can be set in the switch.The inputtable range is the range that satisfies the switch specifications (accuracy, linearity, etc.).It is possible to set a value outside of the inputtable range if it is within the settable range, however, the specification is not guaranteed.ItemInput voltage0 0.7 V5.10 V 5.20 VVoltage input rangeDisplayable rangeSettable rangeLLLHHHPFM<strong>PFMV</strong>PF2APF2WPF2DIF969
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