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Teledyne HFC-302 manual

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Table of contents for the manual

  • Page 1

    INSTRUCTION MANUAL HFM-300 FLOW METER, HFC-302 FLOW CONTROLLER TELEDYNE HASTINGS INSTRUMENTS ISO 9001 CER TIFIED[...]

  • Page 2

    Manual: 151-082010 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 in[...]

  • Page 3

    Manual: 151-082010 300-302 Series Page 3 of 31 Table of Contents 1. GENERAL INFO RMATIO N ............................................................................................................................................ 4 1.1. F EATURES ......................................................................................................[...]

  • Page 4

    Manual: 151-082010 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[...]

  • Page 5

    Manual: 151-082010 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 [...]

  • Page 6

    Manual: 151-082010 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 Po[...]

  • Page 7

    Manual: 151-082010 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 th[...]

  • Page 8

    Manual: 151-082010 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[...]

  • Page 9

    Manual: 151-082010 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 [...]

  • Page 10

    Manual: 151-082010 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 p[...]

  • Page 11

    Manual: 151-082010 300-302 Series Page 11 of 31 Span Error Vs. Pressure 0.017" Sensor -2% -1% 0% 1% 2% 3% 4% 5% 0 100 200 300 400 500 600 700 800 900 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 a[...]

  • Page 12

    Manual: 151-082010 300-302 Series Page 12 of 31 The first method requires that the two controllers use the same signal range ( 0 to 5 VDC or 4 to 20 mA) and that they be sized and calibrated to provide the correct ratio of gasses. Then, by routing the actual flow Output signal from the primary mete r/controller through the secondary controll er’s[...]

  • Page 13

    Manual: 151-082010 300-302 Series Page 13 of 31 variable directly. This analog output signal could b e 0-5 volts, 0-10 volts (or 4-20 ma for units with 4- 20 ma boards) or any value in between. 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 jumpe[...]

  • Page 14

    Manual: 151-082010 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 er[...]

  • Page 15

    Manual: 151-082010 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 Hastin[...]

  • Page 16

    Manual: 151-082010 300-302 Series Page 16 of 31 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 conduction d own the stainless steel se nsor tube, conduction to the insulating foam, plus t[...]

  • Page 17

    Manual: 151-082010 300-302 Series Page 17 of 31 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 causes the heat tran sfer at the downstream heater t o gain heat from the gas stream. The heat gained from the g as stream force s the downstream bridg e control loop[...]

  • Page 18

    Manual: 151-082010 300-302 Series Page 18 of 31 the shunt. Most instruments employ Poiseuille’s law and use some sort of multi-passage device that creates laminar flow between the upstre am sensor inlet and the downstream outlet. This makes the volumet ric flow versus pressure drop curve primarily linear, but there are other effects which introd [...]

  • Page 19

    Manual: 151-082010 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 ups[...]

  • Page 20

    Manual: 151-082010 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 [...]

  • Page 21

    Manual: 151-082010 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 m[...]

  • Page 22

    Manual: 151-082010 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 becom[...]

  • Page 23

    Manual: 151-082010 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.[...]

  • Page 24

    Manual: 151-082010 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 [...]

  • Page 25

    Manual: 151-082010 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 Instr[...]

  • Page 26

    Manual: 151-082010 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 ab[...]

  • Page 27

    Manual: 151-082010 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 fl[...]

  • Page 28

    Manual: 151-082010 300-302 Series Page 28 of 31 7. Drawings and References HFM-300 / HFC-302 Outline Drawing (All dim. Are approximate)[...]

  • Page 29

    Manual: 151-082010 300-302 Series Page 29 of 31 TRANSDUCER ENDCAP ENDCAP SHUNT HFM-300 Sectional View Sensor and Main PC Board[...]

  • Page 30

    Manual: 151-082010 300-302 Series Page 30 of 31 SHUNT ENDCAP ENDCAP VALVE ASSEMBLY CONTROLLER CARD TRANSDUCER HFC-302 Sectional View[...]

  • Page 31

    Manual: 151-082010 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 mishan[...]