Manuale d’uso / di manutenzione del prodotto HFC-302 del fabbricante One for All
Vai alla pagina of 31
INSTRUCTION MANUAL HFM-300 FLOW METER, HFC-302 FLOW CONTROLLER TELEDYNE HASTINGS INSTRUMENTS.
300-302 Series Page 2 of 31 Manual Print History The print history shown below lists the printing da tes of all revisions and addenda created for this manual. The revision level letter increases alph abetically as the manua l undergoes subsequent updates.
300-302 Series Page 3 of 31 Table of Contents 1. GENERAL INFO RMATIO N ............................................................................................................................................ 4 1.1. F EATURES ......................
300-302 Series Page 4 of 31 1. General Information The Teledyne Hastings HFM-300 is used to measure mass flow rat es in gases. In addition to flow rate measurement, the HFC-302 include s a proportional valve to accu rately control gas flow.
300-302 Series Page 5 of 31 1.2. Specifications Accuracy .................................................................................... < ±0.75% full sca le (F.S.) at 3 σ (±1.0% F.S. for >10 slm versions) Repeatability .................
300-302 Series Page 6 of 31 The 4-20 mA I/O option ca n accept a current input. The 0-5 VDC command sign al on pin 14 can be replaced by a 4-20mA command signal. The loop pres ets an impedance of 75 ohms and is returned to the power supply through the valve common.
300-302 Series Page 7 of 31 2. Inst allation and Operation This section contain s the steps necessary to ass i st in getting a new flow meter/controller into operation as quickly and e asily as possible. Please read the following thoroughly before attempting to install the instrument.
300-302 Series Page 8 of 31 2.4. Mechanical Connections 2.4.1. Filtering The smallest of the internal passageways in the Hastings 300 is the diameter of the sensor tube, which is 0.026”(0.66 mm), and the annular clearance for th e 500 sccm shunt which is 0.
300-302 Series Page 9 of 31 Figures 2.1/2.2, and Tables 2.1/2.2, show the 300/302 pin out. Pin # Pin # 1 Signal Com m on 1 Do not us e 2 Do not use 2 Do not us e 3 Do not use 3 Do not us e 4 +15 VDC 4.
300-302 Series Page 10 of 31 Span Error vs Pressure (0.026" Sensor T ube) y = 9.8877E-11x 3 3.4154E-07x - 2 8.3288E-05x + -20.0% -18.0% -16.0% -14.0% -12.0% -10.0% -8.0% -6.0% -4.0% -2.0% 0.0% 2.0% 0 100 200 300 400 500 600 700 800 900 1000 Pressure(psig) Span Error (% reading) Mean error max min 2.
300-302 Series Page 11 of 31 Span Error Vs. Pressure 0.017" Sensor -2% -1% 0% 1% 2% 3% 4% 5% 0 100 200 300 400 500 600 70 0 800 900 1000 Pressure (psig) Span Error (% reading) Mean Max Min If the system pressure is higher than 250 psig (1.7 MPa) the pressure induced error in the span reading becomes signifi cant.
300-302 Series Page 12 of 31 External Input pin (See Tables 2.1 & 2.2), the ratio of flows can be maintained over the entire rang e of gas flows. EXAMPLE: Flow controller A has 0-100 slpm range wi th a 5.00 volt output at full scale. Flow controller B has 0-10 slpm range with a 5.
300-302 Series Page 13 of 31 On the controller card there is a jumper that sets whether the control loop controls mass flow or an external process variable. See Figure 2.7. If the jumper is over the top tw o pins, the loop controls mass flow. If the jumper is over the bottom two p ins, the loop controls an exte rnal process variable.
300-302 Series Page 14 of 31 Fig. 2.8 2.12. Temperature Coefficients As the ambient temperature of the instrument changes from the original calibration temperature, errors will be introduced into the output of the instrument. The Temperature Coefficient of Zero describes the change in the output that is seen at zero flow.
300-302 Series Page 15 of 31 3. Theory of Operation This section contains an o verall functional descript ion of the Hastings 300 ser ies of flow instruments. In this section and other sections throughout this manual, it is assumed that the custo mer is using a Hastings power supply.
300-302 Series Page 16 of 31 can be dissipated by radiation, c onduction, or convection. The r adiation term is negligible due to the low temperatures used by the sensor, and because th e sensor construction preferentially favors the conductive and convective heat tr ansfer modes.
300-302 Series Page 17 of 31 heater to the gas stream will force the upstream bridge control loop to apply more power to the upstream heater so that the 48 o C constant differential temperature is m aintained. The gas stream w ill increase in tempe rature due to the heat it gain s from the upstre am heater.
300-302 Series Page 18 of 31 desired to ensure a stable inst rument, there must be some matching betwe e n the linear volumetric flow versus pressu re drop of the sensor and the shap e of the vol umetric flow versu s pressure drop o f the shunt.
300-302 Series Page 19 of 31 πμ ρ 5 Q L e = For a typical flow divider tube the entry length is approx imately 0.16 cm. From this it c an be seen that if the sensor inlet pickup point is inside of .
300-302 Series Page 20 of 31 0 0.02 0.04 0.06 0.08 0.1 0.12 0.14 0.16 0.18 0 5 10 15 20 25 30 35 Flow ( liter/min ) Passag e T hickness ( cm) Fi g . 3.5 Thickness of the annular ring as a function of flow rate for a sensor with a 75 Pa drop and a 2 c m spacing.
300-302 Series Page 21 of 31 3.7. Control Valve The control valve is an “automatic metering solenoid” valve (see Figu re 3.7). While most solenoid valves operate in either the fully open or closed positions, the automatic me tering solenoid valve is designed to control flow.
300-302 Series Page 22 of 31 This section contains ser vice and calibration info rmation. Some porti ons of the instrument are delicate. Use extreme care when servicin g the instrument. Authorized Maintenance With proper care in installation and use, the inst rument will require little or no maintenance.
300-302 Series Page 23 of 31 Action: Shut off all flow. For the standard 0-5VDC output, adjust the zero potent iometer located on the upper right inlet side of the flow met er until the meter indicates zero. For the optional 4-20 mA output, adjust the zero potentiometer so that the meter indicates slightly more than 4 mA, i.
300-302 Series Page 24 of 31 reverse order of disa ssembly. A new nickel gasket will be required . Secure the endcap with 65 in lb. (7.3 N m) to 85 in lb (9.6 N m) of torqu e on ea ch stainless steel socket head cap screw. Use of a fastener other than the one mentioned here may result in leakage at the seal.
300-302 Series Page 25 of 31 5. Gas Conversion Factors Gas conversion factors (GCF’s) for gasses metered us ing Hastings Instruments products, can be found by visiting the Hastings Instruments web site. The web a ddress can be found at the end of this document.
300-302 Series Page 26 of 31 being used to measure the flow of propane. The readin g from the meter is multiplied by the GCF for propane divided by the GCF of air. 20 * (0.349 9/1.0015) = 6. 9875 To calculate a target setting (20 sccm) to achieve a de sired flow rate of propane using a meter calibrated to air, invert the ratio above and multiply.
300-302 Series Page 27 of 31 6. V olumetric Vs Mass Flow Mass flow measures just w hat it says, the mass or number of mol ecules of the gas flowing through the instrument. Mass flow (or weight per u nit time) uni ts are given in pounds per hour (lb/hour), kilograms per sec (kg/sec) etc.
300-302 Series Page 28 of 31 7. Drawings and References HFM-300 / HFC-302 Outline Drawing (All dim. Are approximate).
300-302 Series Page 29 of 31 TRANSDUCER ENDCAP ENDCAP SHUNT HFM-300 Sectional View Sensor and Main PC Board.
300-302 Series Page 30 of 31 SHUNT ENDCAP ENDCAP VALVE ASSEMBLY CONTROLLER CARD TRANSDUCER HFC-302 Sectional View.
300-302 Series Page 31 of 31 8. W ARRANTY 8.1. Warranty Repair Policy Hastings Instruments wa rrants this product for a period of one year from the date of shipment to be free from defects in mater ial and workmanship.
Un punto importante, dopo l’acquisto del dispositivo (o anche prima di acquisto) è quello di leggere il manuale. Dobbiamo farlo per diversi motivi semplici:
Se non hai ancora comprato il One for All HFC-302 è un buon momento per familiarizzare con i dati di base del prodotto. Prime consultare le pagine iniziali del manuale d’uso, che si trova al di sopra. Dovresti trovare lì i dati tecnici più importanti del One for All HFC-302 - in questo modo è possibile verificare se l’apparecchio soddisfa le tue esigenze. Esplorando le pagine segenti del manuali d’uso One for All HFC-302 imparerai tutte le caratteristiche del prodotto e le informazioni sul suo funzionamento. Le informazioni sul One for All HFC-302 ti aiuteranno sicuramente a prendere una decisione relativa all’acquisto.
In una situazione in cui hai già il One for All HFC-302, ma non hai ancora letto il manuale d’uso, dovresti farlo per le ragioni sopra descritte. Saprai quindi se hai correttamente usato le funzioni disponibili, e se hai commesso errori che possono ridurre la durata di vita del One for All HFC-302.
Tuttavia, uno dei ruoli più importanti per l’utente svolti dal manuale d’uso è quello di aiutare a risolvere i problemi con il One for All HFC-302. Quasi sempre, ci troverai Troubleshooting, cioè i guasti più frequenti e malfunzionamenti del dispositivo One for All HFC-302 insieme con le istruzioni su come risolverli. Anche se non si riesci a risolvere il problema, il manuale d’uso ti mostrerà il percorso di ulteriori procedimenti – il contatto con il centro servizio clienti o il servizio più vicino.
