Diaphragm separators – introduction

Chemical seals are used to measure the pressure of liquids and gases where the measured medium must not be allowed to enter the measuring mechanism of the pressure gauge or transducer.

The solution involves the use of a separating diaphragm and an inert fluid, which transmits the pressure to the measuring mechanism of the pressure gauge or transducer.

 

Gallery of membrane separator applications

ASS - Manometers for the food and chemical industries

  • Stainless steel
  • Ranges from 60 kPa to 250 MPa
  • illed with glycerine (optional)
  • Bottom or rear connection
  • Stainless steel manometers gauge  DN63 or DN100

 

C - clamp - connection with mounting bracket

  • connection with mounting bracket
  • Dimensions DN: 25, 32, 40, 50, 65 (DN 25, 32 and 40 same external dimensions).
  • It is mainly used in the pharmaceutical and food industry.
  • The clamping fastening allows easy disassembly during cleaning.

    • F - Threaded bolt

  • simple design and favorable dimensions
  • It is usually sealing with teflon tape in the thread, possibly with a flat ring outside the thread.
  • Connection: G1/2”, G3/4", G1”, G5/4”, G1 1/2”, G2”  (other subject to agreement)
  • The size of the diaphragm corresponds to the diameter of the connection
  • The small build-up dimension limits the size of the membrane, which brings constraints in combination with some types of manometers, especially in the area of lower pressures.
  • The smallest G 1/2 "separators in conjunction with deformation gauges can only be used in very limited applications
  • In combination with a heat sink suitable for measuring by temperatures up to 400°C

    • H - Separators for homogenizers

  • Are designed to measure higher pressures
  • Typically up to 600 bar.
  • Have a small diaphragm (diameter 23 or 25 mm)
  • Suitable for mounting with low-pressure gauges (DN63)

    • I - pipe separators (IN LINE)

  • Sanitizable pipe separators
  • Do not interfere with the flow average
  • Easy to clean

    •  

    K - Bolted separator

    • Allows the use of large membrane properties at low attachment dimensions
    • Connection: internal thread G1/2”, M20x1,5, NPT 1/2” (other subject to agreement)
    • The separator can be dismantled and the interior space can be cleaned
    • Tantalum membranes or PTFE protective films can be used to measure the pressure of aggressive chemicals; The bottom part can be made of durable plastic or a suitable lining.

    L - Screwed plastic separator

  • MDM-902 - measuring the pressure of aggressive chemicals (acids and lyes)
  • Connection: internal thread G1/2”, G1/4"(other subject to agreement)
  • Membrane material: EPDM with PTFE coating or EPDM and PFA
  • Material of the lower part: PVC-U, PP or PVDF

    • M - Food industry separator

    • connection with quick coupling with union nut according to DIN 11851
    • conical neck (special design: threaded neck)
    • dimensions DN: 25, 32, 40, 50
    • used in the food industry
    • also according to SMS, IDF and other standards

    P - Flange separators

    • The advantage of flanged separators (also called "open flanges") is the large dimension of the diaphragm, which is a prerequisite, for example, for accurately measuring lower pressures or for accurately measuring the pressure in the higher temperature range.
    • Flange dimensions are according to ČSN 131160 resp. DIN 2501: DN25, 32, 40, 50, 65, 80, 100 (mm),  possibly in inches according to ANSI 16,5.

    Q - Separators with semi-open flange

    • The advantage of a semi-sealed diaphragm flange separator is a relatively larger diaphragm with respect to the smaller attachment dimension
    • Flange dimensions according to EN 1092-1: DN 15, 20, 25, 40 (mm)
    • Flange dimensions according to ANSI B 16,5: DN ½“, ¾“, 1“

    R - Reed separators

  • For thick and viscous media (e.g., colors)
  • For flowing heterogeneous substances
  • To high temperatures
  • To high pressures (PN 1600)
  • Easy installation

    • S - Sandwich separators

  • Represent a simplified solution designed for mounting on standard flanges
  • Fastening flanges of corresponding dimensions are used to fasten them.

    • U - Duct separators

  • Tube separators are especially used for double-wall containers and ducts, where the space between the inner and outer walls serves to maintain the desired temperature within the system (e.g., "heated" pipe)
  • The length of the tube is chosen so that the membrane lies approximately at the level of the inner wall
  • Flange dimensions are in accordance with ČSN 131160 resp. DIN 2501: DN25, 32, 40, 50, 65, 80, 100 (mm) or in inches according to ANSI 16.5

    • V - Varivent ® - Separators with perfect sanitization

  • The Varivent ® separator allows you to use the features of a large diaphragm when installing it into lesser piping;
  • Perfect sanitization without removing the separator as the membrane is reliably rinsed with liquid flowing through the pipeline
  • The lid seal meets strict hygiene requirements
  • It is mainly used in the pharmaceutical and food industry.

    • W - Welded separator

    • It is used to effectively crush pressure because it allows the use of a very narrow throat cross section without the risk of clogging
    • It is a simpler version of the K type separator.
    • Connecting : G1/2”, M20x1,5, G1/4”, M12x1,5 according DIN 16288
    • Body diameter: 40, 50, 60 mm
    • The size of the diaphragm corresponds to the diameter of the body.
    • Material: stainless steel (Monel, nickel, etc.)

    Z - Paper industry separator

  • Connection using a flange (or fixed) flange
  • Body of a short tube separator
  • Membrane diameter 48 to 59 mm
  • Is common in the paper industry.
  • To maintain a large diameter of the membrane, the dimensions of the flange are chosen differently from the normalized ones.

    • Separators with cooling adapter

  • Measuring the pressure of hot substances or melts that would become stuck inside the manometer or transducer
  • The measured pressure is transferred through the working fluid through the capillary cooled by the external environment
  • The cooling attachment prevents the meter or transmitter from heating
  • After filling with high temperature oil, the coolant nozzle can measure the media pressure up to 400 ° C
  • The cooling attachment can be used in conjunction with various types of separators

    • Tantalum-coated separators

    • díky použití nové technologie Tantaline® vyrábíme nejen membrány z tantalu, ale i tvarově složité oddělovače s kompletně tantalovým povrchem
    • volitelné forma oddělovače
    • tloušťka tantalové vrstvy je min 0,05 mm

     

    PM111 - Digital pressure gauge with process connection

  • Four-digit LED resp. Five-digit LCD display
  • Process connection - separating membrane
  • Analog output signal
  • relay output
  • digital output
  • One to four adjustable switching levels
  • High transitivity
  • Long-term stability

    • TSZ, TSZ-M - for gauge, absolute and vacuum pressure ranges , i.e. with a diaphragm chemical seal

    • for water,air, hydraulic systems, petroleum products, chemicals, etc.
    • also with diaphragm chemical seal
    • hydrostatic level measurement
    • analog or digital output ignal
    • sanitizable design (CIP)
    • explosion-proof design (ATEX)

    TSP-M Submersible sensor for wastewater level measurement

  • hydrostatic level measurement
  • hanging immersion probe
  • ranges from 0,25 to 100 m W.S.
  • completely welded of stainless steel
  • not influenced by foam or vapour
  • easy installation and disassembly
  • explosion-proof design (ATEX)

    • Attenuation of pressure surges and pulsations

     

    Dampers are used to protect pressure gauges from pressure surges and pulsations.