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1、Technical Information TI 240C/07/en No. 51505599 Sterilisable retractable assembly for pH/Redox measurement CleanFit H CPA 475 Retractable Assembly for pH/Redox Measurement in Tanks or Pipelines under sterile Conditions Applications The retractable pH assembly CleanFit H CPA 475 is used wherever ver
2、y exacting sanitary and hygienic demands are placed on the measuring equipment; the pH electrode is to be sterilised, calibrated or cleaned without interrupting the process; the pH electrodes are not to be removed between batches but must be kept wet; high-accuracy, low-maintenance, sterilisable pH
3、electrodes are required. Features and Benefits For 120 mm gel electrodes or 225 mm liquid KCl electrodes as well as oxy- gen sensor COS 21 All parts in contact with the medium are made of stainless steel 1.4404 (AISI 316L), the seals consist of EPDM or VITON accord- ing to FDA recommendations Severa
4、l adapter versions are available: dairy pipe, Varivent, APV, DN 50 / ANSI 2 flange or 2 clamp connection and DN 25 mount- ing adapter High-quality products are produced in the foodstuffs industry and in the fermentation processes of the pharmaceutical and biotech industries. Product yield and qualit
5、y are affected by minimal deviations of the pH value. A pH control system optimally adapted to the measuring task at hand helps save on costs. CleanFit H CPA 475 2Endress+Hauser Function and system design The retractable assembly CleanFit H CPA 475 can be used for reliable in-process pH and Redox me
6、asurement. The assembly has been designed as a sterilisable retractable assembly for foodstuffs, biotechnology and phar- maceutical applications and other processes with maximum demands on sanitation and hygiene. Without hav- ing to interrupt the process, the electrode can be separated from the proc
7、ess and moved to a rinse chamber manually or pneumatically; rinsed with water or cleaning solution; kept moist during interruptions in operation; removed; sterilised; or calibrated. Those parts of the CleanFit H CPA 475 assembly which contact the medium are executed in stainless steel 1.4404 (AISI 3
8、16L). The seals are made of EPDM or Viton according to FDA recommendations. All common process connections are available (see Process connections section). Left: Rinse chamber with formed seal (F) Right:Rinse chamber for G 1 procces connection Measuring system without control PARAM MEASCAL DIAGPARAM
9、 MEASCAL DIAG C07-CPA471xx-14-07-00-en-001.EPS Assembly CPA 475 Measuring cable CPK 9 Measuring tansmitter, e.g. Mycom S CPM 153 Electrode CleanFit H CPA 475 Endress+Hauser3 Measuring system with pneumatic control Connections for pneumatic control of CPA 475 assembly. ! Note: The pneumatic version o
10、f the assembly is supplied with three-way connectors. Auxiliary energy Pneumatic connections for automatic assembly actuation (if equipped accordingly) The CleanFit H CPA 475 assembly is operated with an air pressure of 4 to 6 bar. The air must be filtered (40 m) and free from water and oil. There i
11、s no continuous pressure demand. The air lines must have a minimum nominal diameter of 4 mm. ! Note: If pressure increases to above 6 bar are possible (including short peak pressures), a pressure reducer must be installed. Connections for limit position detection (optional) Pneumatic limit switch (1
12、: compressed air inlet, 2: compressed air outlet) The lower limit switches are used for the Measurement function, the upper ones for the Service function. Endress+Hauser AUTOCLEAN CPC 20 Endress+Hauser AUTOCLEAN CPC 20 Electr. line Water Compressed air Cleaning agent Water CYR 10 Power supply Compre
13、ssed air Control lines CleanFit H CPA 475 CPM 153 Autoclean CPC 20 Control Output 4 . 20 mA CPK 9 C07-CPA471xx-04-07-03-en-001.EPS Measurement supply air Maintenance supply air Measurement feedback signal Maintenance feedback signal Supply air Measurement Supply air Maintenance Feedback Measurement
14、Feedback Maintenance lines to assembly CleanFit H CPA 475 4Endress+Hauser Operating conditions (installation) Place of installationThe CleanFit H CPA 475 assembly is suitable for mounting on tanks or pipelines. A suitable socket must be available. ! Note: When glass electrodes are used, the minimum
15、inclination of the centre axis of the assembly from the horizontal is 15 (see figure below). If the angle is less than 15, the contact between the inside of the pH membrane and the internal lead (established by the electrolyte) is unreliable. When an ISFET pH electrode is used, assembly inclinations
16、 all the way to the horizontal are allowed. Assembly inclination ranges for glass pH and ISFET pH electrodes CleanFit H CPA 475 Endress+Hauser5 Operating conditions (ambient) Ambient temperatureThe ambient temperature must not drop below 0 C. Caution: Risk of damage due to frost! If temperatures below 0 C are possible, heating of the assembly and any air and water lines is required. Suitability for CIP/SIP cleaning The assembly can be sterilised and
