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Teledyne NALL manual

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Table of contents for the manual

  • Page 1

    INSTRUCTION MANUAL MODEL NALL MASS FLOWMETERS TELEDYNE HASTINGS INSTRUMENTS ISO 9001 CER TIFIED[...]

  • Page 2

    Manual 111-082010_Nall Mass Flowmeters Page 2 of 23 Manual Print History The print history shown below lists the p rinting dates of all revisions and a ddenda created for thi s manual. The revision level letter increases alphabetically as the manual undergoes subseque nt updates. Addenda , which are released between revisions, contain important cha[...]

  • Page 3

    Manual 111-082010_Nall Mass Flowmeters Page 3 of 23 Table of Contents 1.0 GENERAL INFO RMATI ON ....................................................................................................................................... 5 1.1 F EATURES : ....................................................................................................[...]

  • Page 4

    Manual 111-082010_Nall Mass Flowmeters Page 4 of 23 11.6 S PECIFICATIONS ................................................................................................... E RROR ! B OOKMARK NOT DEFINED . 12.0 WARRA NTY AND REPAI R............................................................................................................ .........[...]

  • Page 5

    Manual 111-082010_Nall Mass Flowmeters Page 5 of 23 1.0 General Information 1.1 Features: Hastings Linear Mas s Flowmeters are designed to accurately measure mass flow without corre ctions or compensations for gas pressure and temp erature. Due to a linear electrical out put signal, the flowmeters are ideal for use with totalizers and recorders. Ha[...]

  • Page 6

    Manual 111-082010_Nall Mass Flowmeters Page 6 of 23 2.0 OPERA TING PRINCIPLE 2.1 Operating Principle Hastings Linear Mass Flowmeters operat e on a unique electrical principle whereby a capillary tube is heated uniformly by a transformer. The temp erature distribution is symmetrical about the midpoint at zero flow (see Figure 2.1) and external therm[...]

  • Page 7

    Manual 111-082010_Nall Mass Flowmeters Page 7 of 23 3.0 RECEIVING AND INSPECTION 3.1 Initial Inspection: Carefully unpack the Hastings Linear Mass Flowmete r and inspect it for any obvious signs of damage due to shipment. Immediately advise the carrier who de livered the shipment of any suspected damage . 3.2 Packing List: The basic flowmeter consi[...]

  • Page 8

    Manual 111-082010_Nall Mass Flowmeters Page 8 of 23 4.0 INST ALLA TION INSTRUCTIONS. 4.1 TRANSDUCER 4.1.1 Orientation of the Transducer The transducer may be mounted in any position, as long as the direction of gas flow thro ugh the transducer is from “IN” to “OUT” as marked on the transducer base. (U-Seri es transducers should be mounted i[...]

  • Page 9

    Manual 111-082010_Nall Mass Flowmeters Page 9 of 23 The use of O-ring seal connectors on the transducers w ith female threads is often more convenient for ma ny low pressure applications, such as with U-Series transducers. 4.1.5 Checking for Leaks Check the transducer connections for leaks by pressurizing the line to the operatin g pressure (not to[...]

  • Page 10

    Manual 111-082010_Nall Mass Flowmeters Page 10 of 23 4.4.3 Electrical Zero Check Turn the power supply “ON” and allow the flowmeter 30 minutes to warm up. Stop all flow through the transducer and check the electrical zero. CAUTION: DO NOT ASSUME THAT ALL METERING VA LVES WILL COMPLE TELY SHUT OFF FLOW. EVEN A SLIGHT LEAKAGE THROUGH A VALVE WILL[...]

  • Page 11

    Manual 111-082010_Nall Mass Flowmeters Page 11 of 23 5.0 USING THE FLOWMETER USING THE HASTING S LINEAR MASS FLOWMETER 5.1 Warm-Up Time: When the flowmeter is first turned on, the meter w ill fluctuate somewhat before settling to a stable indication. The flowmeter indicates the mass flow to +/- 3% of full scale in about 5 minutes, but should be all[...]

  • Page 12

    Manual 111-082010_Nall Mass Flowmeters Page 12 of 23 Actual flow = meter reading X (KHe) = 50 SCCM X 1.382 = 69.1 SCCM of Helium 5.5.2 Flowmeter Factory Calibrate d for a Special Gas If the Hastings Linear Mass Flowmeter is calibrated for a gas other th an air, it may also be used to measure the flow rate of many other gases. The flow rate will be [...]

  • Page 13

    Manual 111-082010_Nall Mass Flowmeters Page 13 of 23 Example : (A) What is the output sensitivity of HS-1KS? (B) What is the flow rate for a 2.71 volt output? Solution : (A) Sensitivity = rated flow R a t e d o u t p u t = 1000 SCCM 5 . 0 0 V D C = 200 SCCM/VDC (B) Mass Flow = output X sensitivity = 2.71v X 200 SCCM/VDC = 542 SCCM 5.7 Accuracy: The[...]

  • Page 14

    Manual 111-082010_Nall Mass Flowmeters Page 14 of 23 6.0 PRESSURE EFFECTS 6.1 Standard Transducers: The Hastings Linear Mass Flowmeter can measure mass fl ow accurately without co rrections for a variation in line pressure from one psia (.068 ATM) to 250 psig (18 ATMS.) Mass flow indications are possible with downstream pressures as low as .03 psia[...]

  • Page 15

    Manual 111-082010_Nall Mass Flowmeters Page 15 of 23 7.0 TEMPERA TURE EFFECTS 7.1 Ambient Temperatures: 7.1.1 Transducer In order to maintain the accuracy of the flowmeter with changes in ambient temperat ure, it is necessary to keep the temperature of the transdu cer between 10° C and 50° C. (The te mperature of the base is normally about 10° C[...]

  • Page 16

    Manual 111-082010_Nall Mass Flowmeters Page 16 of 23 8.0 DIFFERENTIAL PRESSURE 8.1 TYPICAL PRESSURE DROPS The differential pressure drop (DP) across the Hastin gs HS-Series Mass Flow Transduce r can vary between 0.50” H2O depending upon the transducer’s range. Ot her press ure drops are listed below and all are based upon full-scale flow rates [...]

  • Page 17

    Manual 111-082010_Nall Mass Flowmeters Page 17 of 23 8.2.2 Decrease in Line Pressure The relationship stated in Section 8. 2.1 also shows that DP i ncreases prop ortionally as absolute line pressure decreases. This situation is true un til the DP becomes a significant part of the tota l absolute line pressure. When this occurs, the relationship bec[...]

  • Page 18

    Manual 111-082010_Nall Mass Flowmeters Page 18 of 23 9.0 Calibration 9.1 CALIBRATION PROCEDURES The Hastings Mass Flowmeter has been carefully inspected and calibrated at the f actory before shipment and will give long, reliable service. Calibration is stable , and recalibratio n is seld om necessary under normal operating conditions; however, to m[...]

  • Page 19

    Manual 111-082010_Nall Mass Flowmeters Page 19 of 23 TRANSDUCER MILLIVOLT TEST +5 VDC OUTPUT BIAS METER GAIN TRMS AC TEST JUMPER T1 FOR 230V OPERATION FOR 581A ONLY FIG 9.1[...]

  • Page 20

    Manual 111-082010_Nall Mass Flowmeters Page 20 of 23 10.0 Maintenance 10.1 Transducers: 10.1.1 Cleaning With proper care in installing and us e, the transducer will require little or no maintenance. Should the small passages in the transducer become part ially clogged, they can be cleaned with any suitable solvent such as acetone, vythene, etc. and[...]

  • Page 21

    Manual 111-082010_Nall Mass Flowmeters Page 21 of 23 11.0 Accessories OPTIONS AND ACCESSORIES 11.1 Double Point Relay Flowmeter/Alarm ( DNALL-P): The Hastings Flowmeter/Alarm is a complete Linear Mass Flowmeter with all of its charac teristics and ranges. It also includes two adjustable HI-LO set points which can be read on the digital indicator. W[...]

  • Page 22

    Manual 111-082010_Nall Mass Flowmeters Page 22 of 23 a) What is the sensitivity of the totalizer? b) What is the total flow indicated by the 13, 500 count? c) What is the average flow rate over the 7 hour period? Solution: a) The full scale flow rate for the TNALL-P/ HS-10S is 10 SCCM. The full-scale count rate for the totalizer is 100 counts per m[...]

  • Page 23

    Manual 111-082010_Nall Mass Flowmeters Page 23 of 23 12.0 W arranty and Rep air 12.1 Warranty Repair Policy Hastings Instruments warrants this product for a period of one year from the date of shipment to be free from defects in material and workmanship. This w arranty does not apply to defect s or failures resulting from unauthorized modification,[...]