Pneumatic Clean Series

636Pressure Switch (Solid State Type)/Common Precautions 1Be sure to read before handling. Refer to pages 7 to 16 of Front matter for safety instructionsand common precautions for clean series. Refer to the main text for precautions for each series.WarningWarningSelectionqWatch for internal voltage drops of the switch.When the switch is used below the specified voltage, the loadsometimes may not operate even if the pressure switchoperates normally. Confirm the operating voltage of the loadand adjust it to satisfy the equation below.Power voltage - Internal drop voltage > Load operating voltageCautionqData on the digital pressure switch will be storedeven after the power is turned off.Input data (set pressure, etc.) will be stored on the EEPROMand will not disappear even after the digital pressure switch isturned off (100,000 nours after the power is off).MountingqDo not drop or bump.Do not drop, bump or apply excessive impacts (100m/s 2 ) whilehandling. Although the body of the switch may not bedamaged, the internal parts could be damaged and cause aproblem.wHold the body of the switch when handling.The tensile strength of the connection from cable to switch is49N. If the applied force exceeds this specification, the switchwill be damaged.eKey button operationRefer to the operation manual on how to calibrate the switchusing the push buttons.rDo not touch the LCD.Do not touch the LCD of an LCD type pressure switch inoperation because it may cause the display to be changed bystatic pressure.tPressure portDo not insert a wire or a similar item into the pressure port. Itmay damage the pressure sensor and cause it malfunction.WarningWiringqDo not wire with power lines or high voltage lines.Wire separately from power lines and high voltage linesbecause noise can cause malfunction of the control circuitincluding the switch.wDo not allow short circuits of loads.A digital pressure switch displays an overcurrent error whenthe load is short-circuited. This function, however, cannotprotect the circuit from every incorrect wiring. Therefore takespecial precautions in wiring.Other pressure switches will be instantly damaged if the load isshort-circuited. Especially, be careful not to mistake the powersupply cord (Brown) for the power output cord (Black).CautionPipingqPiping of hosesIn a panel application, the switch may receive excessive stresson the body from piping like hoses, etc. Avoid excessive forceby following proper installation procedures.Pressure SourceWarningqStay within the specified range of fluid and ambienttemperature.The ambient and fluid temperature range is 0 to 50°C for digital pressureswitches and 0 to 60°C for other types of pressure switches. If thetemperature is 5°C or below, take measures against freezing because thewater in the circuit may freeze to cause malfunction. Installation of an airdryer is recommended to remove drain and moisture. Do not use theswitch in an environment with sudden temperature changes even if theambient temperature range complies with the specifications.wVacuum switchAn instant positive pressure pulse of up to 0.5 MPa will notaffect the performance of the switch (At the time of vacuumdestruction). However, avoid a continuous positive pressure of0.2 MPa or above since it will cause damage to the switch.WarningOperating EnvironmentqDo not use in an area where there are surge or staticelectricity sources.Installation of the switch in an area with surge voltagegenerating equipment, such as electromagnetic lifters, highfrequency furnaces, motors or equipment that generates staticelectricity, etc., can cause immediate damage to the switchinternal circuit elements or cause the switch to malfunction aftera period of time. Apply surge protection measures as well asanti-static measures to the source of the surge and keep thelines apart from each other.wOperating environmentAvoid using the standard digital pressure switches in anenvironment with water or oil splashes because they are notprotected against external substances. Use of dustproof anddripproof types are recommended in such an environment.CautionMaintenanceqCleaning the bodyWipe off dirt with soft cloth. In case of heavy dirt, soak the clothin neutral detergent diluted with water, wring the water out,wipe off the dirt with the cloth and finish with dry cloth.617Pressure Switch