TY1－3A 14／18
(5) If fluid having pressure variance is led into the pressure gauge, the pressure gauge may
become defective earlier. Most troubles are caused by such pressure variance and
mechanical vibrations.
Pressure variances may be reduced by a restriction installed at the inlet of the pressure
gauge.
The other is a dampener, which is a variable restriction type and connected as a screw
coupling of the pressure gauge. It is adjusted while observing shaking of the pointer of
the pressure gauge. In adjustment, close the dampener fully, then open it gradually.
In adjustment, do not stop down the restriction to the extent that the pointer stops
shaking, because it is unknown in such a condition whether the accurate pressure is
indicated. Thus, adjust the restriction to the extent that the pointer slightly shakes.
(6) As shown in (3) Materials of Liquid-Contacting Parts on page 7/18, the liquid contacting
parts of this pressure gauge are mainly made of brass and stainless steel, which are not
suitable to some substances. For such substances, diaphragm type gauges or proper
gauges should be selected.
Do not use this pressure gauge for fluids which may corrode the liquid contacting
parts.
If corrosive fluid flows through this pressure gauge, the pressure element (Bourdon
tube) may be damaged or burst and it flows out, resulting in injury or damages to the
peripheral device and equipment.
(7) For measuring oxygen, use an oil-free pressure gauge.
A general-purpose gauge may sometimes have oil in it.
Such oil may react with oxygen, resulting in fire or explosion.
(8) For details, read through JIS B7505-1 and make every effort to use the gauge in safety.
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