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300-302 Series Page 3 of 31
Table of Contents
1. GENERAL INFORMATION............................................................................................................................................ 4
1.1. FEATURES.................................................................................................................................................................... 4
1.2. SPECIFICATIONS........................................................................................................................................................... 5
1.3. OPTIONAL 4-20 MA CURRENT OUTPUT............................................................................................................................ 5
1.4. OTHER ACCESSORIES ...................................................................................................................................................... 6
1.4.1. Hastings Power Supplies..................................................................................................................................... 6
1.4.2. 300/302 Series Power Supply Interface Cables.............................................................................................. 6
2. INSTALLATION AND OPERATION............................................................................................................................. 7
2.1. RECEIVING INSPECTION ............................................................................................................................................... 7
2.2. POWER REQUIREMENTS ............................................................................................................................................... 7
2.3. OUTPUT SIGNAL........................................................................................................................................................... 7
2.4. MECHANICAL CONNECTIONS....................................................................................................................................... 8
2.4.1. Filtering.................................................................................................................................................................. 8
2.4.2. Mounting ................................................................................................................................................................ 8
2.4.3. Plumbing ................................................................................................................................................................ 8
2.5. ELECTRICAL CONNECTIONS......................................................................................................................................... 8
2.6. OPERATION.................................................................................................................................................................. 9
2.6.1. Operating Conditions............................................................................................................................................. 9
2.6.2. Zero Check ........................................................................................................................................................... 10
2.6.3. High Pressure Operation ..................................................................................................................................... 10
2.6.4. Blending of Gases................................................................................................................................................. 11
2.7. OUTPUT FILTER ......................................................................................................................................................... 12
2.8. CONTROLLING OTHER PROCESS VARIABLES ............................................................................................................. 12
2.9. COMMAND INPUT....................................................................................................................................................... 13
2.10. VALVE-OVERRIDE CONTROL..................................................................................................................................... 13
2.11. GAIN POTENTIOMETER .............................................................................................................................................. 13
2.12. TEMPERATURE COEFFICIENTS ................................................................................................................................... 14
3. THEORY OF OPERATION ........................................................................................................................................... 15
3.1. OVERALL FUNCTIONAL DESCRIPTION........................................................................................................................ 15
3.2. SENSOR DESCRIPTION................................................................................................................................................ 15
3.3. SENSOR THEORY........................................................................................................................................................ 15
3.4. BASE.......................................................................................................................................................................... 17
3.5. SHUNT DESCRIPTION .................................................................................................................................................. 17
3.6. SHUNT THEORY ......................................................................................................................................................... 17
3.7. CONTROL VALVE....................................................................................................................................................... 21
3.8. ELECTRONIC CIRCUITRY............................................................................................................................................ 21
4. MAINTENANCE.............................................................................................................................................................. 22
4.1. TROUBLESHOOTING ................................................................................................................................................... 22
4.2. ADJUSTMENTS ........................................................................................................................................................... 23
4.2.1. Calibration Procedure ......................................................................................................................................... 23
4.3. END CAP REMOVAL................................................................................................................................................... 23
4.4. PRINTED CIRCUIT BOARD REPLACEMENT.................................................................................................................. 24
4.5. SENSOR REPLACEMENT ............................................................................................................................................. 24
5. GAS CONVERSION FACTORS.................................................................................................................................... 25
6. VOLUMETRIC VS MASS FLOW................................................................................................................................. 27
7. DRAWINGS AND REFERENCES ................................................................................................................................ 28
8. WARRANTY .................................................................................................................................................................... 31
8.1. WARRANTY REPAIR POLICY ...................................................................................................................................... 31
8.2. NON-WARRANTY REPAIR POLICY ............................................................................................................................. 31