YOKOGAWA. General Specifications. Model RAKC Short-tube Rotameter. GS 1R1B3-E-H 4rd Edition

Transcription

1 General Specifications Model RAKC Short-tube Rotameter A conical float is guided into a cylindrical metal tube provided with an orifice plate. The position of this float is magnetically transmitted to the indicator. The short-tube Rotameter is used for measurement of low flow rates of liquids and gases. Its special application is in troubled, opaque or aggressive mediums and under high pressure. The instrument is mounted in a vertical pipeline with flow direction upwards. FEATURES Standard design with internal thread Other process connections on request Without valve (vertical connection) With valve (horizontal connection) Controller with valve can be fitted Pressure resistant (40, 100, 160 bar). Other ratings on request. Optional output signal of 4-20 ma by electronic transmitter Intrinsically safe version Optional limit switch (Min., Max.) MEASUREMENT PRINCIPLE Float-flowmeter with sturdy magnetic indication attachment Figure 1. Measurement principle YOKOGAWA 4rd Edition

2 2 STANDARD SPECIFICATIONS Fluid to be measured : Liquid or gas Measurable flow rates : Refer to Flow table Measuring range : 10:1 Accuracy : According to VDI/VDE 3513 Class 4; for smallest range (Cone 31), 5% of endscale value Indicator scale : Flow units or percent Process temperature - Standard : -180 ºC to +150 ºC - With limit switch : -40 ºC to +150 ºC - For electronic transmitter: -40 ºC to +150 ºC For temperatures < 0 ºC or >100 ºC, please specify the /A1 option ('Isolation distance') Process connection - Inner thread : G 1/4"; 1/4 NPT; G 3/8"; 3/8 NPT - Cutting ring : 6 mm; 8 mm; 10 mm; 12 mm - Nozzle : 6 mm; 8 mm Materials : Medium wetted parts of Other materials on request Housing - material : Cast aluminium painted - Installation position : Vertical - Flow direction : Upwards - Installation length : Typically 125 mm - Protection : IP 64 - Color : Yellow Weight : Refer to Weight on page 7 LOCAL INDICATOR (SUFFIX CODE: T70) Ambient temperature : -50 ºC to +100 ºC Option : Limit switch ELECTRONIC TRANSMITTER (SUFFIX CODE: E70 NOT EX; SUFFIXCODE: X70 EX-VERSION) Power supply : V DC Consumption : 20 ma - Load resistance Ri : Ohm - Max. voltage : Umax = 30 V - Max. short circuit current : Imax = 30 ma Output signal : 4-20 ma The output signal is not linear with the flow, and should be linearized externally for optimization. Electrical classification : [EEx ib] IIC T6 - Certificate of conformity : DEMKO 90C.98014X - Internal capacity Ci : 30 nf - Internal inductivity Li : < 250 mh - Temperature range : T6:-20/+40 ºC, T4:-20/+50 ºC Electrical connection : PG7 - Cable diameter : 3-6 mm - Max. conductor : 1,5 mm 2 Connection diagram : See figures 1 and 2 POWER SUPPLY FOR ELECTRONIC TRANSMITTER Option code: /U2I : 220 V AC (Ex-version) Option code: /U4F : 24 V (Ex-version) Other voltages and current versions on request G + 2 F RAKC-E70 1 Output 4-20 ma + A l = Ohm + Supply voltage V DC Figure 1. Transmitter -E70424 without power supply (not intrinsically safe) G + 2 PA PA 2 Output 4-20 ma P l = Ohm IN Terminal 17 is at PApotential F RAKC-X IN- + NG 24 EX2- (EEx ib) IIC ~ ~ N L1 Supply voltage 220 V AC TYP NG24EX2-220AC 110 V AC TYP NG24EX2-110AC 24 V DC TYP NG24EX2-024DC Ex - area non EX - area Figure 2. Transmitter -X70424 with power supply (intrinsically safe)

3 3 TECHNICAL SPECIFICATION OF THE OPTIONS LIMIT SWITCHES (OPTION CODE: /K1.../K3) Type : Inductive switch SJ 3,5-N acc. DIN (NAMUR) Ambient temperature : -25 ºC to +100 ºC Nominal voltage : 8 V DC (Ri 1 kω) Supply voltage range : 16 V Output signal : 1 ma=0; 3 ma=1 LIMIT SWITCHES IN FAIL SAFE VERSION (OPTION CODE: /KS) Type : Inductive switch SJ 3,5-SN acc. DIN (NAMUR) in FAIL SAFE version Ambient temperature : -40 ºC to +100 ºC Other specifications : See type SJ 3,5-N Available with options /K1.../K3 only POWER SUPPLY FOR LIMIT SWITCHES (OPTION CODE: /WXX) Type : Transistor relay acc. DIN (NAMUR) Power supply : 230 V AC + 10%/-15%, 50/60 Hz (/W2A,/W2B) 24 V DC ± 20% (/W4A,/W4B) Relay output : 1 potential-free changeover contact (/W2A, /W4A) 2 potential-free changeover contacts (/W2B, /W4B) Switching capacity : Max. 250 V AC; max. 2 A Control circuit Entity parameters : Intrinsically safe [EEx ia] IIC : acc. certificate of conformity PTB Nr. Ex-94.C2086 CONTROLLER (OPTION CODE: /R1.../R4) Differential pressure controller for a constant flow at fluctuations of the process pressure. - Controller /R1 and /R2 for liquids with variable inlet or outlet pressure and for gases with variable inlet pressure and constant back pressure. - Controller /R3 and /R4 for gases with fluctuations of the back pressure. Max. liquid flow : 100 l/h Max. gas flow : 3000 l/h Max. pressure : 40 bar Recommended differential pressure : > 400 mbar Materials Housing Diaphragm Springs Control characteristics CrNi-steel PTFE CrNi-steel Brass Buna CrNi-steel : See diagram The curves V1 to V6 indicate how the flow depends on the inlet pressure for different valve settings. The back pressure at the outlet (ambient pressure) is 1 bar. l/h air at 20 ºC, bar abs. Inlet pressure Figure 3. RAKC with limit switches and power supply Figure 4. Diagram control characteristics

4 4 MODEL SPECIFICATIONS Model Suffix code Description RAKC53 Connecting diameter 6 mm for process connection only RAKC54 Connecting diameter 8 mm C4; C6; C7; P1 RAKC55 Connecting diameter 10 mm for process connection only RAKC56 Connecting diameterr 12 mm C4; C6; C7 RAKC41 Connecting diameter 1/4 inch for process connection only RAKC42 Connecting diameter 3/8 inch R4; G4; G6; T4; T6; T7 Process -R4 Internal thread Rp PN40 connection -G4 Internal thread G PN40 for models -T4 Internal thread NPT PN40 RAKC41 -G6 Internal thread G PN100 RAKC42 only -T6 Internal thread NPT PN100 -T7 Internal thread NPT PN160 -C4 Cutting ring PN40 for models -C6 Cutting ring PN100 RAKC53, RAKC54, -C7 Cutting ring PN160 RAKC55 and RAKC56 -P1 Nozzle PN10 RAKC53 and RAKC54 only Material wetted SS ,(AISI 316 Ti) parts Cone - See Flow table Valve NNN Without valve (not with optional controller) Gasket Valve socket SAE With insertion valve in input 1) Buna Silver SBE With insertion valve in input 1) Viton Silver SAA With insertion valve in output 1) Buna Silver SBA With insertion valve in output 1) Viton Silver Indicator/transmitter -T Local indicator -E Electronic transmitter (not Ex) -X Electronic transmitter (Ex) Housing type 70 Aluminium Power supply, output NNN Use for local indicator/t V DC (2-wire, 4-20 ma) Style code *A Style Options / See Options 1) Valve can only be used until PN16. The contents of the selection table should be noted for determining the model code. Recommended Please specify in the following order - controller/without controller - valve/without valve - connecting diameter RAKC and process connection - flow range - model, suffix and option code. Ordering instructions: Standard 1. Model, suffix and option code 2. Flow conditions a. Temperature b. Pressure c. Viscosity d. Density For gases : cross-reference of the scale Option /BG : customer specification notes

5 5 OPTIONS Options Option code Description Isolation distance /A1 Indicator with isolation distance for t > 100 ºC or t < 0 ºC Mark /B1 Stainless steel tag plate /BG Tag number. Please specify. Tests/Certificates /H1 Certificate of degrease /P2 Certificate of compliance with the order (acc. to DIN 50049, 2.1) /P3 Test report (acc. to DIN 50049, 2.2) /P6 Inspection certificate (acc. to DIN 50049, 3.1b: pressurised parts) /PP Inspection certificate for pressurised air Limit switch /K1 MIN contact /K2 MAX contact /K3 MIN-MAX contact, MIN-MIN-contact, MAX-MAX-contact For T-indicator only /KS FAIL-SAFE version, MIN-contact /K7 FAIL-SAFE version, MAX-contact /K8 FAIL-SAFE version, MIN-MAX-contact /K9 FAIL-SAFE version, MIN-MIN-contact /K10 FAIL-SAFE version, MAX-MAX-contact Limit switch in FAIL-SAFE version (-40 C to C), only in combination with options /K1... /K3 Controller /R1 Inlet controller (of ) with valve in the input For gases with variable /R2 Inlet controller of brass with valve in the input inlet pressure and liquids with variable inlet and back pressure /R3 Back pressure controller (of ) with valve in the output For gases with variable /R4 Back pressure controller of brass with valve in the output back pressure Additional /U2I Power supply 220 V AC; 4-20 ma; 24 V Ex Instruments /U4F Power supply 24 V DC; 4-20 ma; 24 V Ex /W2A Transistor relay KFA6-SR2-Ex1.W/230 V AC; 1 channel, changeover contact /W2B Transistor relay KFA6-SR2-Ex2.W/230 V AC; 2 channels, changeover contacts /W4A Transistor relay KFD2-SR2-Ex1.W/24 V DC; 1 channel, changeover contact /W4B Transistor relay KFD2-SR2-Ex2.W/24 V DC; 2 channels, changeover contacts Options can be added to the model code.

6 6 FLOW TABLE Recommended combinations Water/Liquids Air/Gases* 20 C 20 C,1 bar absolut Optional Design R Process connection Max. Cone Pressure Max. Cone Pressure controller (valve) A Flow drop Flow drop K C [l/h] code [mbar] [I/h] code [mbar] , C4/-C6/-C7/-P C4/-C6/-C7/-P without NNN 55 -C4/-C6/-C C4/-C6/-C G4/-G6/-T4/-T6/-T C4/-C6/-C7/-P1 54 -C4/-C6/-C7/-P1 without NNN 55 -C4/-C6/-C C4/-C6/-C G4/-G6/-T4/-T6/-T SAE 2, SBE 53 -C4/-P without 54 -C4/-P SAA 55 -C C SBA 41 -R4/-T R1, R2 SAE 2, SBE 53 -C4/-P C4/-P R R3, R2 SAA SBA Higher measuring ranges with process connection 1/2" (old design KCl ) on request. Valve model is advised

7 7 DIMENSIONS 158 Cutting ring Figure 5. Version NNN (without valve) Cutting ring Figure 6. Version SAE and SBE (with valve in input) Figure 7. Version SAA and SBA (with valve in output) Cutting ring Cutting ring 168 Figure 8. Versions SAE and SBE with option /R1 or /R2 (with valve in input and with inlet controller) Figure 9. Versions SAA and SBA with option /R3 or /R4 (with valve in output and back pressure controller) WEIGHT Weight Measuring range Dimension a Without valve With valve With control max. 100 l/h water G1/4 or 1/4 NPT ca. ca. ca g l/h water G3/8 or 3/8 NPT 600 g 1000 g -

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