TELEDYNE HASTINGS INSTRUCTION INSTRUCTION MANUAL INSTRUMENTS MODEL HFM-60 FLOWMETER page 1
Manual Print History The print history shown below lists the printing dates of all revisions and addenda created for this manual. The revision level letter increases alphabetically as the manual undergoes subsequent updates. Addenda, which are released between revisions, contain important change information that the user should incorporate immediately into the manual. Addenda are numbered sequentially.
Table of Contents 1 . 0 GENERAL INFORMA TION ............................................................. 5 INFORMATION 1.1 Features ............................................................................................................................... 5 1.2 Specifications ....................................................................................................................... 6 1.3 Optional 4-20 mA Current Output ..................................................................
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SECTION 1 General Information The Hastings Mass Flowmeter, HFM-60 is designed to accurately measure mass flow up to 70 slpm with an accuracy of better than 3%. Hastings mass flow instruments do not require any periodic maintenance under normal operating conditions with clean gases. No damage will occur from the use of moderate overpressures (~150 psi) or overflows. Calibrations for other gases, such as oxygen, helium and argon, are available upon special order.
1.2 Specifications Accuracy ......................................................................................................................... <±3% F.S. Repeatability ................................................................................................. ±0.2% of F.S.(typical) ±0.4% of F.S. (max.) Maximum pressure ............................................................................................................. 150 psi. Pressure coefficient ...................................
1.3 Optional 4-20 mA Current Output An option to the standard 0-5 VDC output is the 4-20 mA current output that is proportional to flow. The 4 - 20 mA signal is produced from the 0 - 5 VDC output of the flowmeter. The current loop output is useful for remote applications where pickup noise could substantially affect the stability of the voltage output. The load impedance should be between 0 and 400 Ω. 1.4 Digital Display (0-90° Tiltable) 1.4.
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SECTION 2 Installation This section contains the necessary steps to assist in getting a new flowmeter in operation as quickly and easily as possible. Please read the following thoroughly before attempting to install the instrument. WARNING The customer should determine if their process gas is compatible with the wetted materials of the flowmeter as specified in section 1.2. Some corrosive gases may damage the flowmeter materials and elastomer corrosivegases ing.
There is a threaded hole in the bottom of the transducer that can be used to secure it to a mounting bracket, if desired. Other holes for special mounting can be added to the end cap as desired. The standard inlet and outlet fittings for the HFM-60 are 1/4" NPT to 1/4" Swagelok (optional VCR and VCO fittings are available from the factory). The O-rings for the end cap and the sensor are Buna N (optional Kalrez, Neoprene or Viton O-rings are available from the factory).
2.6.4 Range Changes: The range of the flowmeter can be changed in the field if recalibration facilities are available. The flowmeter may require a different shunt which can be purchased from the factory.
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SECTION 3 Theory of Operation This section contains an overall functional description of the HFM-60. Detailed schematics and parts lists can be found at the end of the manual in Section 5.0. In this section and other sections throughout this manual, it is assumed that the customer is using the wall transformer power supply supplied by Hastings or a Hastings Power Supply. 3.1 Overall Functional Description The HFM-60 consists of a sensor, a base, shunt and electronic circuitry.
Temperature of tube ZERO FLOW SMALL FLOW TC-1 L/2 TC-2 0 L/2 Length of tube figure 3.2 3.3 Base The 6061 aluminum alloy base has a 1" square cross-section and is 3.375" long (with end cap). The internal flow channel is 0.812" diameter with in and out 304L stainless steel fittings 1/4" NPT to 1/4" Swagelok fittings. 3.4 Shunt The flow rate of interest determines the size of the shunt required.
epoxy flow Aluminum 10 sccm - 200 sccm (typical configuration) figure 3.3 (a) annular flow passages flow 500 sccm - 70 slm (typical configuration) figure 3.
3.5 Electronic Circuitry The HFM-60 employs a thermal flow sensor (capillary tube described in section 3.2) to measure the flow which is proportional to the total flow through the instrument. The sensor develops a differential voltage output signal proportional to flow which is approximately 1 mV full scale magnitude. A differential amplifier and an inverting amplifier boost the signal strength by a factor of ~5000 at full scale flow.
SECTION 4 Maintenance 4.1 Authorized Maintenance With proper care in installation and use, the flowmeter will require little or no maintenance. If maintenance does become necessary, most of the instrument can be cleaned or repaired in the field. Some procedures may require recalibration. Do not attempt these procedures unless facilities are available. Entry into the sensor or tampering with the printed circuit board will void warranty.
4.3 Adjustments Calibration Procedure (See figure 4.1) 1. Connect power to pins 1 and 2 as specified in Section 2.5. Allow the instrument to warm up for 30 minutes with 10% flow. 2. Completely shut off the flow and wait for 2 minutes. For the standard 0-5VDC output, adjust the zero potentiometer located on the lower outlet side of the flowmeter 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.
4.4 End Cap Removal The end cap on the inlet side must be removed to gain access to the filter and shunt assembly. First remove power and shut off the supply of gas to the instrument. Disconnect the Swagelok fittings on the inlet and outlet sides of the transducer and remove it from the system plumbing. Remove the two Allen head screws holding the end cap to the instrument (see figure 4.2).
4.5 Printed Circuit Board Replacement In the event that any of the PC boards fail, they are easily removed from the instrument and replaced with a spare. This ease in disassembly and replacement substantially reduces instrument downtime. 1. Replacement of the 4-20 mA option PC board: Unplug the power cable from the transducer. If a digital display exists, unplug the phone jack connection and remove the flowmeter cover. Remove the 4 brass spacers and lift off the 4-20 mA board.
SECTION 5 Warranty and Repair 5.1 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 warranty does not apply to defects or failures resulting from unauthorized modification, misuse or mishandling of the product. This warranty does not apply to batteries or other expendable parts, nor to damage caused by leaking batteries or any similar occurrence.
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SECTION 6 Diagrams and Drawings page 23
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