Instruction Manual YOKOGAWA Model FD20 Immersion Fittings pH/ORP IM 12B6K2-01E-E 7th edition
TABLE OF CONTENTS 1. INTRODUCTION.......................................................................................................... 2 2. SPECIFICATIONS........................................................................................................ 3 2-1. General specifications............................................................................................. 3 2-2. Functional specifications.........................................................................................
2. SPECIFICATIONS 2-1. General specifications Materials - wetted parts A. body (refer to model code) - : polyproplylene (PP) stainless steel AISI 316 (SS) polyvinylchloride (PVC) polyvinylidenefluoride (PVDF) : silicone rubber : titanium (PP and PVDF design) stainless steel AISI 316 (SS design) : Ryton R 4 : stainless steel cable (twisted) B. O-rings C.
2-3.
2-4.
4-hole PP and PVDF 3-hole SS ISO 228/2-G 1/2 2x 27 ISO 228/2-G1/2 (3x) ø130 ø76 L 27 L ø110 ø80 80 M8 Flange Flange øk øk dg dg øD øD 35 b b ø 188 L IM 12B6K2-01E-E
4-hole SS Flange øk 27 ISO 228/2-G 1/2 (3x) dg ø 88 L øD ø 100 M8 35 FD20-V18-..-NF FD20-V18-..-F1 FD20-V18-..-S1 FD20-P37-..-NF FD20-F37-..-NF FD20-P37-..-F2 FD20-F37-..-F3 FD20-P37-..-S2 FD20-F37-..-S3 FD20-S37-..-NF FD20-S37-..-F4 FD20-S37-..-S4 FD20-P47-..-NF FD20-F47-..-NF FD20-P47-..-F5 FD20-F47-..-F6 FD20-S47-..-NF FD20-S47-..-F7 FD20-S47-..
3. INSTALLATION 3-1. Selecting the installation site It is important that, whatever method of mounting is used, the point of measurement is truly representative for the entire solution. GOOD GOOD - Avoid an area where the measurement value varies significantly. HORIZONTAL - Ensure that the sensors are always immersed 15º 15º in the process liquid (not dry). - When selecting the installation site, first check that the liquid temperature and pressure meets the sensors and fittings requirements.
3-3. Cables and sensor mounting Before mounting a sensor and/or accessory the cables must be passed through the fitting. When mounting Yokogawa sensors the electrode cables, model WU20(D), should be used (see figure 3-2). Length 1, 2, 51/2, 10, 15, 20 or 25 m. 3-3-1. 1-Hole fitting Unscrew the protector from the lower end and the nut with glands from the top end of the fitting. Mount the cable and sensor as shown in figure 3-3.
Type WU20D-LT Type WU20D-PC Cable nut Cable nut 10 cm 10 cm Cable nut Cable nut 10 cm 10 cm colour marker colour marker colour marker colour marker colour marker core red COAX colour marker colour marker screen blue screen blue colour marker core red inner screening blue TRIAX inner screening blue outer screening white core red outer screening white core red Attention: Ensure that the cable has slack remaining in the fitting so that sensor replacement is simplified.
3-3-2. 3-Hole and 4-hole fitting Unscrew the protector complete with electrode holder from the lower end of the fitting (see figure 3-3). Protection hose Unscrew the cap of an electrode mouting set. Pass the electrode cable through this cap and after that through the fitting. Mount the other electrode cables in a similar manner. Pass the electrode cables and the liquid earth cable through a hose connection, which is delivered with the fitting in a plastic pocket.
4. MOUNTING OF ACCESSORIES 4-1. Mounting kit (FP20-S13(D)) Using this mounting kit a SR20(D)-AC32 reference electrode of Yokogawa can be mounted in a fitting (see figure 4-1.). For atmospheric conditions the mounting kit can be used also for combined electrodes, types SC29-PTC54. Electrodes to be used* Order nr. Description SR20(D)-AC32 Reference electrode SC29-PTC54 Combined redox/reference electrode * For specifications of the electrodes see seperate sheets. Parts and accessories Order nr.
4-2. Mounting kit (order nr. K1500BY) This mounting kit replaces the standard electrode mounting set so that Yokogawa refillable electrodes with a long glass shaft can be mounted in a fitting. The mounting set may be used at process pressures up to 3 bar. Higher pressure ratings require the standard mounting set and consequently, electrodes with DINdimensions. Figure 4-2 shows the mounting. KCI-Reservoir K1500FU Note: The pressure on the KCI-solution must always exceed the liquid pressure.
4-3. Cleaning systems The standardised design of fittings makes it possible to mount cleaning systems directly. The 4-hole types are especially designed for these applications. The Yokogawa program includes two different types of cleaning systems (see figure 4-3): - brush cleaning (electrically or pneumatically driven) - chemical cleaning Fig. 4-3a. Brush Cleaning Fig. 4-3b. Chemical Cleaning 4-3-1.
4-3-2. Brush cleaning The brush of this cleaning system wipes across the glass membrane of the electrode every 30 seconds. Electrically or pneumatically driven versions are available. Figures 4-4a and 4-4b show the mounting. Protection hose K1520NC Tubing K1520NA Motor K1520NF Control unit Control unit Cable model WU20(D) Piston unit K1520NH O-rings (11x3) (K1500BZ) O-rings (11x3) Brush holder K1520NG Brush holder K1520NG Fig. 4-4a.
4-3-3. Chemical cleaning The chemical cleaning system is based on periodically spraying of a cleanser on to the glass membrane of the electrode. The cleanser to be used, the cleaning frequency, etc. are highly dependent on the liquid to be measured. The cleaning period and frequency can be adjusted on a control unit. The mounting procedure is shown in figure 4-5. Parts and accessories Order nr.
4-4. Salt bridge This reference electrode/salt bridge combination allows the measurement of pH and ORP (Redox) potentials with normal electrodes in those cases when: A. excessive contamination of the flow diaphragm is expected. The flow of the reference liquid through the diaphragm is increased by pressurising the container. Consequently, the contamination rate will decrease. B. the process to be measured cannot stand contamination with KCI. The salt bridge can be filled with several electrolytes, e.g.
5. MAINTENANCE AND INSPECTION 5-1. Cleaning and fitting Usally no cleaning is necessary. 5-2. Inspection of the O-ring seal The O-ring seal used in the wetted parts of the fitting is made of silicone rubber which has superior resistance to corrosion and is suitable for use with most process liquids. Usually no periodically inspection is necessary. To prevent trouble, replace the O-ring seal periodically, e.g. every year.
1-Hole PVC Note This fitting has no liquid earth connection 3-Hole PP and PVDF 4-Hole PP and PVDF 3-Hole SS 4-Hole SS IM12B6K2-01E-E
YOKOGAWA ELECTRIC CORPORATION World Headquarters 9-32, Nakacho 2-chome, Musashino-shi Tokyo 180-8750 Japan www.yokogawa.com YOKOGAWA ELECTRIC ASIA Pte. LTD. 5 Bedok South Road Singapore 469270 Singapore www.yokogawa.com/sg YOKOGAWA CORPORATION OF AMERICA 2 Dart Road Newnan GA 30265 USA www.yokogawa.com/us YOKOGAWA CHINA CO. LTD. 3F Tower D Cartelo Crocodile Building No.568 West Tianshan Road Changing District Shanghai, China www.yokogawa.
