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Manual: 152-082010 301-305-306_303-307 Series Page 3 of 35
Table of Contents
1. GENERAL INFORMATION............................................................................................................................................4
1.1. FEATURES.................................................................................................................................................................... 4
1.2. SPECIFICATIONS........................................................................................................................................................... 5
1.3. OPTIONAL 4-20 MA CURRENT OUTPUT ....................................................................................................................... 6
1.4. OTHER ACCESSORIES................................................................................................................................................... 6
2. OPERATION......................................................................................................................................................................7
2.1. RECEIVING INSPECTION ............................................................................................................................................... 7
2.2. POWER REQUIREMENTS ...............................................................................................................................................7
2.3. OUTPUT SIGNAL........................................................................................................................................................... 7
2.4. MECHANICAL CONNECTIONS.......................................................................................................................................7
2.5. ELECTRICAL CONNECTIONS......................................................................................................................................... 8
2.6. 4 – 20 MA CONNECTIONS........................................................................................................................................... 11
2.7. OPERATION................................................................................................................................................................12
2.8. RANGE CHANGING..................................................................................................................................................... 16
2.9. OUTPUT FILTER ......................................................................................................................................................... 16
2.10. CONTROLLING OTHER PROCESS VARIABLES .............................................................................................................16
2.11. COMMAND INPUT....................................................................................................................................................... 16
2.12. VALVE OVERRIDE CONTROL ..................................................................................................................................... 17
2.13. GAIN POTENTIOMETER .............................................................................................................................................. 17
2.14. TEMPERATURE COEFFICIENTS ................................................................................................................................... 18
3. THEORY AND FUNCTION........................................................................................................................................... 19
3.1. OVERALL FUNCTIONAL DESCRIPTION........................................................................................................................ 19
3.2. SENSOR DESCRIPTION................................................................................................................................................ 19
3.3. SENSOR THEORY........................................................................................................................................................ 19
3.4. BASE.......................................................................................................................................................................... 20
3.5. SHUNT DESCRIPTION.................................................................................................................................................. 21
3.6. SHUNT THEORY .........................................................................................................................................................21
3.7. CONTROL VALVE....................................................................................................................................................... 23
3.8. ELECTRONIC CIRCUITRY............................................................................................................................................ 24
3.9. INSTRUMENT PERFORMANCE..................................................................................................................................... 24
4. MAINTENANCE..............................................................................................................................................................25
4.1. AUTHORIZED MAINTENANCE..................................................................................................................................... 25
4.2. TROUBLESHOOTING ...................................................................................................................................................25
4.3. ADJUSTMENTS ........................................................................................................................................................... 26
4.4. END CAP REMOVAL................................................................................................................................................... 27
4.5. PRINTED CIRCUIT BOARD AND SENSOR REPLACEMENT............................................................................................. 28
5. OUTLINE DRAWINGS .................................................................................................................................................. 29
5.1. HFM-301................................................................................................................................................................... 29
5.2. HFC-303 ...................................................................................................................................................................29
5.3. HFM-305................................................................................................................................................................... 30
5.4. HFM-306................................................................................................................................................................... 30
5.5. HFC-307 ...................................................................................................................................................................31
6. WARRANTY.................................................................................................................................................................... 32
6.1. WARRANTY REPAIR POLICY...................................................................................................................................... 32
6.2. NON-WARRANTY REPAIR POLICY .............................................................................................................................32
7. APPENDIX .......................................................................................................................................................................33
7.1. APPENDIX 1- VOLUMETRIC VERSUS MASS FLOW....................................................................................................... 33
7.2. APPENDIX 2 - GAS CONVERSION FACTORS ................................................................................................................ 34