SMC Networks AR20MK Series Operation Manual page 5

Warning
(1) Polyacetal resin parts are used for the exterior. Organic solvents including thinner, acetone, alcohol
and ethylene chloride; chemicals including sulphuric acid, nitric acid and hydrochloric acid; cutting
oil, synthetic oils, ester-based compressor oil, alkali, kerosene, gasoline, and thread lock solutions
are harmful. Do not use the product where these are present.
(2) Consult SMC if no leakage is allowed due to the environment, or if the operating fluid is not air.
(3) Shield from ultra violet light and heat radiation with protective cover.
(4) A safety device should be installed if output pressure is exceeding the set pressure, otherwise this
can cause breakage of outlet device and equipment or lead to malfunction.
Caution
(1) Allowed air consumption from the exhaust port is 0.1 L/min(ANR) or less.
(2) When multiple regulators are connected together, supply an adequate amount of air.
If air supply is inadequate, the flow rate characteristics (as if when a single product is used alone)
will not be obtained.
Warning
(1) Grease used on the internal sliding parts and seals may flow to the outlet side. If this is not
acceptable, please consult SMC.
(2) Residual pressure of product without backflow function is released unstably even though the inlet
pressure is released (pressure might be left in the product). Please select a regulator with backflow
function to release the residual pressure completely.
(3) Long absence of operation or operation with outlet circuit sealed or balancing circuit may cause
pressure fluctuation in outlet set pressure. Please consult SMC if this is not acceptable.
(4) Set range of outlet pressure shall be 85% or less of the inlet pressure. Operating at a setting
exceeding 85% causes the outlet pressure to be easily affected by fluctuations in flow rate and inlet
pressure, leading to instability.
(5) Since the safety margin is calculated to the maximum regulating pressure range shown in the
specification table, the pressure setting may be over the maximum value. However, use the
product within the specified range.
(6) If the product is used with circuit which requires high exhaust sensitivity or set precision, please
consult SMC.
Caution
(1) This product cannot be installed between the solenoid valve and actuator. For that application,
please use AR□K-D series.
Warning
(1) Connect the product ensuring the direction of "1" and "2" for air direction and indicated arrow.
Incorrect connection leads to malfunction.
(2) Install with enough space around the filter regulator to perform regular maintenance and
operation. Refer to （P22） the dimensional drawings for necessary space.
(3) Do not drop or apply impact during transportation or installation. Damage of products or pressure
gauge can result in malfunction.
(4) Do not install in areas with high humidity or high temperature. It may lead to a malfunction of the
pressure gauge.
Precautions for Design
Selection
Mounting
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