Food Industry

Pressure measurement in food engineering

Chemical seals in the application field of the coffee industry (AppBe_L_004)

for plant operators in the coffee industry 
for planning and engineering offices in food processing 
for procedural plant construction firms in the food industry
Application Pressure measurement food engineering ARMANO Messtechnik GmbH
Procedural plants in the food industry are subject to frequently changing operating conditions. Thus, coffee is considered a medium difficult to process, as it is subjected to frequent cleaning processes. Therefore, pressure gauges have to meet high technical prerequisites.

The problem:

Regarding industrial processing of coffee (e.g. production of instant coffee), a viscous extract is formed after the brewing process, which is transported through pipelines for further processing.
During transportation, coffee particles in the extract deposit on all wetted parts. These are not only the inner walls of the pipes but also all wetted parts of the measuring instruments. After only approximately 12 – 15 weeks, the coffee particles form a very hard crust, which in general can only be removed by high pressure cleaning (1,000 bar). The measuring instruments had to be separately cleaned from residues in caustic baths over several days, as high pressure cleaning was impossible until now.

Basic cleaning problems:
  • Cleaning can only take place during downtime of the plant
  • During the cleaning process all pressure gauge units must be removed and separately cleaned in a caustic bath
  • Medium residues impair the performance of the pressure measuring units after only a few production cycles – in a later process it can even be destroyed

Our solution:

We have different special versions of chemical seals that meet the demands of high pressure cleaning and that do not have to be dismantled, which means they are suitable for inline high pressure cleaning. This allows for shorter cleaning times, a second batch of measuring instruments is no longer necessary and there are no longer additional costs for separate cleaning of measuring instruments with deposit build-up. These facts lower the costs of the plant operator considerably. 

The use of our in-line seal RDM 7635.9 has proven to be particularly economic. In the nominal widths DN 40 and DN 50, it can be easily cleaned inline. Beyond that, our chemical seal models MDM 7515 with flange and extension tube as well as our MDM 7340.17 are also recommendable. 

The efforts with conventional instruments can be significantly reduced with our instruments.

Chemical seals in the application field of the coffee industry graphic ARMANO Messtechnik GmbH

Our instruments in detail:

Our advantages:
Chemical seal RDM 7635.9

  • Longer lifetime (several years as opposed to weeks)
  • Cleaning times are significantly reduced
    • the RDM can remain inline also during the cleaning phase
    • further cleaning effort such as installation and deinstallation of the instrument as well as a subsequent caustic bath are no longer necessary
  • Cleaning and inspection cycles are significantly reduced
  • Due to reduced inspection cycles, the plant can quickly be taken back into operation
  • Even with stubborn grime adhesions and after cleaning procedures (e.g. with water jetting processes at approx. 1,000 bar) our diaphragms "polygon almost round"       allow for
    • a flawless performance
    • a stable zero point
    • a long-lasting, non-destructive operating time
  • It can be combined with all common pressure measuring instruments (pressure gauges, pressure gauges with limit switch contact assembly, pressure gauges with integrated pressure transmitter DMU, pressure transmitters, etc.)
  • Operating temperature tA: up to 220 °C (428 °F)
  • Other specifications upon request
Our alternative:
Diaphragm seal MDM 7515 or 7340.17

In many cases existing plants do not allow for extensive modifications – we have taken this circumstance into account!

The ARMANO Messtechnik GmbH is able to supply high quality technology for existing plants, which distinctly outshine other instruments available on the market. This includes among others our diaphragm seals (MDM 7515 resp. 7340.17). These specifically feature a modified diaphragm structure.

Advantages of diaphragm seals:
  • Guaranteed operative readiness even at a high degree of media adherence
  • verifiably a significantly longer lifetime