INSTRUCTIONS OF PRESSURE GAUGE |
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| Mounting |
| Different types of cases are possible according to position of the connection. |
TYPE B
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TYPE W
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TYPE D
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TYPE P
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TYPE U
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Direct mounting Bottom connection without flange |
Wall mounting Bottom connection with back flange |
Direct mounting
Back connection without flange |
Flush panel mounting
Back connection with front flange |
Flush panel mounting
Back connection with U-clamp |
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| Position |
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Always vertical, otherwise specify the direction and angle.
A pressure gauge is calibrated in a vertical position. The pointer may be out of zero if the instrument is horizontal, chiefly for low pressure ranges. However, this is not a defect. |
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Threads
Standard threads are: Taper PT (BSPT) or Taper NPT or Parallel PF (BSP) |
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Parallel PF (BSP)
Place a gasket between the end of the thread and around the spigot. |
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Taper PT (BSPT) or Taper NPT
Tightness is achieved metal on metal without any gasket. However, a seal tape wound around the thread prevents leakage and provides a better tightness and makes the screwing easier. |
| Oxygen |
| For oxygen service, the parts of gauge must be oil-free. Specify by ordering. |
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| Installation |
| Never install the pressure gauge by turning the case but mount it with a wrench by means of the hexagon or flats provided on the socket. |
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| Isolating Cocks |
| A pressure gauge must never be mounted without an isolating cock. |
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| Vibrations |
Vibrations of the pressure gauge must be avoided to prevent excessive wear of the mechanism. It would be better to set the gauge on a rigid support on which the vibrations of the pipe have no influence. If this mounting is impossible, choose the pressure gauge with liquid filled.
A flexible small diameter capillary can also be placed between the gauge and diaphragm seal. A capillary can also be used as a vibrations or pulsations damper. |
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| Pressure Pulsations |
In the case of pressure measurements of pulsating fluids, a damper should be fitted between the pressure gauge and the pipe.
Adjustment of damper will be done on line where the gauge is used, according to the pressure pulsations. |
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| Corrosion |
If stainless steel do not provide sufficient guarantee against corrosion, place a diaphragm seal between gauge and pipe.
Parts of the diaphragm seal in contact with fluid (lower flange and diaphragm) are made of a material withstanding corrosive fluids: stainless steel, PP, PVC, PTFE, PVDF…etc. or coated with corrosion-proof materials (Teflon, halar, Kel F…etc.). |
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| Temperature |
Excessive temperatures must be avoided.
Standard pressure gauge with brass connection must not be subjected to permanent temperature over 60℃. Special weld on the joining of tube and socket can make the gauge use for process temperature within 120℃ (Specify when ordering).
All stainless steel pressure gauge can be durable for process temperature within 120℃. The pressure gauge, whose case and socket are sealed by weld, can be used for process temperature within 180℃ (Specify when ordering).
Siphon, capillary or heat reduction fitting should be placed between the gauge and the pipe or tank in which filled with hot media. |
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| Full Scale Range |
The full scale range of pressure gauge should be 1.5 to 2 times of maximum process pressure.
Using overpressure the full scale range is not allowed.
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