Ceramic durability

By implementing oxide ceramics , KROHNE is using a technically superior material for electromagnetic flowmeters (EMF) and pressure measuring devices that is permanently resistant to corrosive and abrasive media. Additionally, ceramic is immune to temperature shocks and absolutely safe against gas discharge and leaks – all in all a unique combination for high-performance applications in all industrial sectors.

Ceramic durability

By implementing oxide ceramics , KROHNE is using a technically superior material for electromagnetic flowmeters (EMF) and pressure measuring devices that is permanently resistant to corrosive and abrasive media. Additionally, ceramic is immune to temperature shocks and absolutely safe against gas discharge and leaks – all in all a unique combination for high-performance applications in all industrial sectors.

Highlights

  • High-resistance to abrasion

  • Suited for pastes and sludges with very high solid content

  • The helium leakage rate of ceramic including electrodes is less than 10-7 (hPa * l)/s, this means „gas-tight“

  • Vacuum-resistant up to 0 hPa

  • High mechanical strength and form stability

  • 0 % porosity (important for aggressive outgassing or toxic media)

  • Excellent surface quality and very low roughness (Ra < 0.8 µm)

  • Over 30 years of experience with industrial ceramic

  • Successful adaptions for various applications

Overview of KROHNE devices with oxide ceramics:

Flowmeters

Installation

Size/DN

Ceramic

Electrode

OPTIFLUX 5000

Flange

15 ... 300

FZM

CERMET, sintered-in

Sandwich

2.5 ... 15

FZM

CERMET, sintered-in

Sandwich

25 ... 100

FZT

Platinum pin electrode with plated head, pin sintered-in

BATCHFLUX 3100

Sandwich

2.5 ... 40

FZM

Platinum pin electrode with plated head, pin sintered-in

BATCHFLUX 5500

Sandwich

15

FZM

CERMET, sintered-in

OPTIFLUX 7000

Flange

2.5 ... 40

FTM

Capacitive, on ceramic tube

Sandwich

25

FZM

Capacitive, on ceramic tube

40 ... 100

FZT

Capacitive, on ceramic tube

Ceramics used:

FZT: FRIALIT® FZT: ZrO2-stabilised Al2O3, Bending strength = 460 MPa*, E-module = 360 GPa

FZM: FRIALIT® FZM: MgO partially stabilised ZrO2, Bending strength = 500 MPa*, E-module = 200 GPa

*1 MPa = 1 N/mm2

Pressure instruments

OPTIBAR PC 5060 Pressure transmitter

OPTIBAR­LC 1010 Immersion probe

Measuring ranges

0.025…100 bar

0...1 to 0...100 mH2O

Reference accuracy

<0.05 to 0.2% of URV

<±0.35% FSO

Process temperature

–40...+150°C

-40...+80°C

Process connections / material

Thread of more than 1/4¨, ASME flange, EN, DIN, JIS from DN15 in 316L, C276, Duplex, PVDF

Thread R1¨,

Flange DN50,

cable: TPE

Approvals

Ex ia, Ex d, SIL2/3

ATEX/IECEx Ex ia 1G,

drinking water

approvals (KTW, ACS)

Ceramics used:

Sapphire: 99.96 % Al2O3 ceramic, Bending strength = 630 MPa, E-module¬=¬406 GPa

Special features of flowmeters with ceramic liner:

  • Oxide ceramic is very resistant to acids and lyes. (Nitric acid and nitrohydrochloric acid or even hot concentrated hydrochloric acid cannot damage the oxide ceramic)

  • Adherence to the pressure equipment directive (DGLR)

  • Resistant to abrasive media: long service life especially compared to plastic liners

  • Fully vacuum-resistant

  • Dimensionally stable: high resistance to temperature shocks of up to 120 K and pressure stresses

  • Very high burst pressure/overload resistanct

  • No deposits/gumming on surface, diffusion tight and immune to leakage

  • Sintered-in CERMET electrodes

  • Leading metrological institutes use KROHNE ceramic EMFs as their master/ reference meter

Special features of pressure measuring devices with ceramic diaphragm

  • Suitable for pressure applications of up to 100 bar and 150 °C

  • Overload-proof up to 200 times the nominal measurement range

  • 100 % hydrogen resistance

  • 100 % diaphragm breakage detection

  • In the event of diaphragm breakage this is detected by the sensor electronics

  • Ten times harder than stainless steel

  • Absolutely vacuum-tight

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