EN 837-2 has to be considered for the selection of the suitable model. In particular, the user has to ensure that the pressure medium may not corrode any of the wetted parts.

    For a more detailed debion of application criteria we recommend the commentary of the DIN e. V. "Überdruckmessgeräte nach DIN EN 837", published by Beuth Verlag.

   

   Standard Materials for Wetted Parts:

    Ordering code – 1 PsP 60*
                     Connection brass,
                     lower half grey cast iron, grey varnished,
                     with back connection: zinc plated carbon steel,
                     diaphragm carbon steel, varnished,
                     for -1/0 up to 0-1 bar: Duratherm®**,
                     O-ring NBR (nitrile rubber)

                     PsP, PsPChg, PsPChgG 80*
                     Lower half with connection brass,
                     diaphragm CuBe,
                     O-ring NBR (nitrile rubber)

                  – 2 PsP 60* / PsPK 63* for chlorine metering service
                     Lower half with connection carbon steel,
                     black varnished at the outside parts,
                     diaphragm carbon steel, varnished, with Ag-foil,
                     for -1/0 and 0-1 bar: diaphragm Duratherm®**,
                     O-ring Viton® (FPM, fl uorcaoutchouc)

                  – 3 PsP 60*
                     Lower half with connection 316 st. st. (1.4571),
                     diaphragm carbon steel, varnished, with
                     protection foil 316 stainl. steel (1.4571),
                     for -1/0 and 0-1 bar: diaphragm Duratherm®**,
                     O-ring Viton® (FPM, fl uorcaoutchouc)
    Other materials, e. g. aluminum,optionally available upon request!

   Advantages
    Insensitive to pressure pulses and vibrations due to a higher characteristic natural frequency of the restrained diaphragm in comparison to Bourdon tubes with free movable tip

    Insensitive to sudden pressure relief respectively to sudden vacuum loss, since no positive locking exists between the measuring element and the pointer

    High overpressure protection possible (optionally 3 x full scale value, up to max. 50 bar) by means of an adequate modifi cation of the diaphragm and the contact section of the opposite component

    Requiring just a small space in comparison to pressure gauges with horizontal diaphragm and, different from those, also available in versions for panel mounting

   Application Examples
    Oil pressure measurement at piston engines,

      gearings, hydraulic systems up to 40 bar
    Chlorine metering services
    NCS 80 especially for fi re-extinguishing pumps
      (portable pumps, pumps on fi re-engines)

   General Features

   Nominal Case Sizes (NCS)
    Pressure gauges with vertical diaphragm are available with nominal case sizes
    60 (2.36" )    with black bezel,
                   for various applications
    63 (2½")       screw ring case polyamide 6B,
                   for chlorine metering service
    80 (3")        with stainless steel bezel and
                   with crimped-on ring,
                   for fi re fi ghting pumps

   Liquid Fillings
    Liquid fillings are available for the fire fi ghter version with crimped-on ring, model PsPChgG 80-1 rm.

   Process Connections
    With just a few exceptions the standard connections of our pressure gauges with vertical diaphragm are
    ¼" BSP (nom. case sizes 60 and 63, resp. 2.36", 2½")
    M 20 x 1.5 (nom. case sizes 80 resp. 3", for fi re-extinguishing pumps)

    But almost all models are also available with connection threads
    ¼" NPT, or M 12x1.5 (nom. case sizes 60, 63 resp. 2½")
    ½" NPT, or ½" BPS (nom. case sizes 80 resp. 3" )
    without extra charges.
    Numerous special versions are available at option.

   Pressure Ranges
    Bar is the prefered unit of pressure according to EN 837-3.

    In this model overview on page 7 you will fi nd the pressure ranges stated in bar.
    But in fact there are numerous different pressure units available, such as psi (compare page 6), kg/cm², kPa, MPa and others.
    Dual or triple scales are also possible.
    Special scales can be delivered upon request.

   Special Options

    Only a few examples for options and modifi cations can be mentioned in the following overview.
    More detailed debions of the available options and special versions are to fi nd in the relevant data sheet.
    Further individual special confi gurations are possible upon request.

   Features of Measurement...

   Accuracy According to EN 837-3
    Class 1.6
    Class 2.5 for versions with protection foil, and for NCS 80
    [i.e. accuracy error less than 1.6% respectively 2.5% of full span at reference
temperature +20 °C (+68 °F)]

   Construction
    The diaphragm of pressure gauge models PsP... is mounted vertically,i. e. parallel behind the dial.
    The lifting of the diaphragm is converted into a pointer move by two small levers and a toothed movement.

   Dial
    The nominal ranges, scale spacings and numberings as well as the dial markings for bar pressure ranges are in accordance with EN 837-3.
    Standard dials show a black scale on a white background.
    Pressure ranges and subdivisions see table on page 6.

   Pressure Limitations
    To guarantee a long service life, the selection of the pressuregauge should be such that the working pressure does not exceed 75% of the maximum scale value for steady pressure or 65% of the maximum scale value for cyclic pressures (according to EN837-2).

    The following pressure limitations are to consider:
    at steady pressure:    full scale value
    at cyclic pressure:    90% of the full scale value
    overpressure:          max. 130% of full scale value
                           (at option up to 3x, max. 50 bar)

   ...Features of Measurement, Standard Scales / Scale Division

    Temperature Limitations
    Storage temperature: – 40 °C to +70 °C (-40 / +158 °F)
    Ambient temperature: –20 °C to +60 °C (- 4 / +140 °F)
    Medium temperature: +60 °C max. (+140 °F)

    Please consider any further limitations that are possibly to fi nd in our data sheets. Special versions and further temperature ranges are available upon request.

   Reference Temperature: +20 °C (+68 °F)
    Operating temperatures of the measuring system (elastic element and movement) different from +20 °C (+68 °F) will cause additional deviations of the pressure indication. These can be up to ± 0.8 % per each 10 K (18 °F) in accordance with EN 837-3.

   Electrical Accessories
    The installation of electrical accessories is limited to
    Reed switches for PsPK 63

   Standard Pressure Ranges / Scale Division

    Models PsP 60, PsPK 63 (2.36", 2½")

   NCS 80 for fi re-extinguishing pumps
    are according to DIN 14421 available with pressure ranges
    0–25 bar,smallest subdivision = 0.5 bar
    -1/+25 bar, zero at 12 o clock, smallest subdivision = 1 bar
        resp. for vacuum range = 0.05 bar
    1) not available with protection foil!