| 1921 |
LUDWIG KROHNE & SOHN founded. Production of variable-area
flowmeters. |
| 1952 |
First electromagnetic flowmeter for industrial
applications (TOBI 1952 / KROHNE Altometer 1962) |
| 1953 |
Precision forming of cylindrical glass tubes
into high accuracy tapered measuring tubes |
| 1954 |
First inductive transducers for variable area
flowmeters in Germany |
| 1959 |
Level indicator with float and magnetic coupling |
| 1960 |
Introduction of an accurate conversion method
for variable area flowmeters, subsequently adopted as VDI Code |
| 1961 |
First electromagnetic flowmeter as a product
of the KROHNE Group (ALTOMETER) |
| 1966 |
Construction of the world's largest calibration
rig in Sliedrecht/Netherlands |
| 1972 |
Development of the pulsed DC field for electromagnetic
flowmeters |
| 1978 |
Development of double-beam ultrasonic flowmeters |
| 1979 |
Construction of a still bigger and more accurat
calibration rig in Sliedrecht/NL |
| 1980 |
First delivery of an ultrasonic flowmeter to
Shell for crude oil measurements |
| 1985 |
Development and production of the Coriolis mass
flowmeter |
| 1990 |
First microwave radar (FMCW) level gauge for
level measurement |
| 1994 |
First straight-tube Coriolis mass flowmeter |
| 1996 |
First electromagnetic flowmeter for partially
filled pipes (TIDALFLUX). |
| 1996 |
ALTOSONIC V is the first ultrasonic liquid
custody transfer meter in the world. |
| 2000 |
Commissioning of an eleventh calibration rig,
the largest and most accurate in the world, at KROHNE Altometer, 43 metres
high calibration tower, calibration volume uncertainty < 0.013% |
| 2001 |
First electromagnetic 2-wire flowmeter with full
process application compatibility, intelligent power optimization, high
dynamic |
| 2002 |
The new generation of massflow meters with straight
tube, OPTIMASS. |
| 2003 |
First 3-beam ultrasonic flowmeter for the chemical
industry, UFM 3030. |
| 2004 |
New Generation lectromagnetic flowmeters OPTIFLUX
with built-in diagnostics for process, accuracy and meter integrity. |
| 2004 |
The new generation Level Radar OPTIWAVE
and guided Radar OPTIFLEX with unique wizard-driven operating concept |
| 2006 |
Most efficient clamp-on ultrasonic flowmeter OPTISONIC 6300 |
| 2007 |
OPTISWIRL 4070 C first vortex flowmeter with integrated pressure and temperature compensation
in 2-wire technology |
| 2009 |
ALTOSONIC V12 combines, for the first time in an ultrasonic flowmeter, the advantages of the parallel chord concept and the reflection technique, setting a new standard in ultrasonic custody transfer gas metering. |
