01.The operating pressure should be in the mid-third of the pressure range specified for the gauge. The maximum pressure load should not exceed 75% of full scale value at static loads, or 65% of full scale value for pulsating loads.
02.When selecting pressure gauges the selection criteria and installation recommendations provided here must be observed.The use of pressure gauges. which do not meet the requirements encountered in practice can cause great consequential damage.
03.When using hazardous pressure media, for example, oxygen, acetylene combustible substances,toxic substance,as well as refrigerating units, compressors etc. the appicable regulations must be observed. Fluid fliled pressure gauges must be equipped with blow-out devices,
04.The repair of pressure gauge should leave to skilled staff. Cenerally,pressure gauges will not require any maintanance, These instruments may only be repaired by the manufature.
05.For sealing connections with a parallel thread, for example, flat gaskets or profle seals must be fitted or on the other hand, the corresponding sealing lens has to be provided in case of high pressure connection.
06.The pressure gauge needs to be mounted at the proper position so that it will not be subjected to vibration for accurate dial reading.
07.If the temperature of the pressure medium at the point where it is measured deviates from the operating temperature specified for the pressure gauge, then a sufiently high pressure gauge, a siphon. or a chemical seal with a capillary line must be mounted to the pressure gauge.
08.For services at corrosive atmospheres or fluid elemnents, suitable casings and components made of corrosion resistant materials must be provided. Also special material may help to protect the outside of the pressure gauge. For example SS316, PP or teflon, Because of the rstricted choice of materials for the elastic elements,diaphragm pressure gauges with protective lining will possibly have to be used, or chemical seals made of pressure media resistant materials needed to be mounted to a bourdon tube pressure gauge.
09.Before installation the tapered threads (PT & NPT Threads) are to be sealed off with additional sealants like PTFE tape, for example. As fo PF & PS threads, it is recommended to use suitable flat gaskets in the material of brass or teflon to be fitted.
10.During installation or removal of a lower mounting pressure gauge, apply the wrench to the wrench flats provided. It must be ensured that the matching process connection has been selected (nominal width,suitable sealing face, if required).
11.During installation or removal oÍ the lower back or center back mounting pressure gauge, do the same steps as point 10, in the case of flange joints or mounting bracket, the flanges are joined using suitable bolts to tighten the joints, do the same with the mounting bracked until it is leaktight.
12.During installation or removal never apply any forces to the case oÍ the pressure gauges, as it might affect the accuracy of the pressure gauge.
13.Do not touch the diaphragm as it might cause consequential damage to the pressure gauge.
14.For pressure gauges with pressure relief vent at the top of the case it is recommended for pressure ranges lower than or equal (7 KG/CM2-/100 PSI) to cut off the nipple at the fili plug so that the gauge can be vented in order to compensate the intemal pressure.
15.When the intallation is completed, start the device for measuring point slowly in order to avoid sudden pressure spikes during start-up and cause damage to the gauge.
16.Precision inspection is recommended once every year for bourdon tubes, capsule & diaphragm type of gauges.
