One for All HFC-302 manuale d’uso

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. Addenda, which are released between revi sions, contain important change inf ormation that the[...]

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. The Hastin gs mass flow meter (HFM-300) and controller (HFC-302), hereafter referred to as the Hastings 300 s[...]

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 ............................................................................. ±0.05% of reading + 0.02% F.S. Maximu[...]

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. 1.4. Other Accessories 1.4.1. Hastings Power Supplies Hastings power supplie s are a[...]

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. 2.1. Receiving Inspection Carefully unpack the Hastings unit and[...]

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 0.006"(0.15 mm) (all other flow ranges have larger pass ages), so the instrument require[...]

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 Do not us e 5 5 Signal Com m on 6 Output 0- 5 VDC (4-20 m A) 6 Output 0- 5 VDC (4- 20m A) 7 Signal Com m on 7 Case G round 8 Case Ground 8 Valve Over[...]

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 2.6.2. Zero Check Turn the power supply on if n[...]

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. The charts above show the mean[...]

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 5.00 volt output at full scale. If flow controller A is set at 80 s[...]

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. This process v[...]

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. This error is added to the[...]

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. 3.1. Overall Functional Description The Hastings 300 meter consis[...]

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. The thermal energy of e ach heater will then be dissipated by conduc[...]

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. This elevated gas stream temperature caus[...]

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. Most instruments employ Poiseuille’s law and use some sort of multi-passage device that creates lamina[...]

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 the flow divider tube but downstream of the entrance length and if the sensor outlet point is inside the fl ow divider tube but upstream of the exit p[...]

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. Each shunt must have a section of the annular region upstream of the upstream sensor tap[...]

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. A spring is used to ho ld a magnetic plunger asse mbly tightly against[...]

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. If maintenance does become necessary, most o[...]

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.e. 4. 03 to 4.05 mA. Thi[...]

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. Recalibration of the Hastings 300 is nec[...]

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. The gas conversion factors (GCF's) provided by Hast ings Instruments (HI) fall in[...]

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. 2[...]

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. When your specifications st ate units of flow to be in mass un[...]

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. This warranty do es not apply to defects or failures resulting from unauthorized mod ification, misuse or mishandling of the produc[...]