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Manual 111-082010_Nall Mass Flowmeters Page 3 of 23
Table of Contents
1.0
GENERAL INFORMATION....................................................................................................................................... 5
1.1 FEATURES:................................................................................................................................................................... 5
2.0 OPERATING PRINCIPLE ..........................................................................................................................................6
2.1 OPERATING PRINCIPLE................................................................................................................................................. 6
3.0 RECEIVING AND INSPECTION............................................................................................................................... 7
3.1 INITIAL INSPECTION:.................................................................................................................................................... 7
3.2 PACKING LIST:............................................................................................................................................................. 7
3.3 DECIMAL POINT SETTING: ........................................................................................................................................... 7
3.4 POWER SOURCE:..........................................................................................................................................................7
3.5 ELECTRICAL ZERO:...................................................................................................................................................... 7
3.6 INDICATION OF FLOW: ................................................................................................................................................. 7
4.0 INSTALLATION INSTRUCTIONS............................................................................................................................ 8
4.1 TRANSDUCER.......................................................................................................................................................... 8
4.2 FILTERS:....................................................................................................................................................................9
4.3 CABLES ..................................................................................................................................................................... 9
4.4 POWER SUPPLY:...................................................................................................................................................... 9
5.0 USING THE FLOWMETER...................................................................................................................................... 11
5.1 WARM-UP TIME: ....................................................................................................................................................... 11
5.2 RESPONSE TIME:........................................................................................................................................................ 11
5.3 MASS FLOW UNITS:................................................................................................................................................... 11
5.4 SPECIAL FACTORY CALIBRATIONS: ........................................................................................................................... 11
5.5 GAS CONVERSION FACTORS: ..................................................................................................................................... 11
5.6 OUTPUT SIGNAL: ....................................................................................................................................................... 12
5.7 ACCURACY:............................................................................................................................................................... 13
5.8 REPEATABILITY: ........................................................................................................................................................ 13
5.9 OVER-RANGE:............................................................................................................................................................ 13
6.0 PRESSURE EFFECTS................................................................................................................................................ 14
6.1 STANDARD TRANSDUCERS: ....................................................................................................................................... 14
6.2 LOW PRESSURE DROP TRANSDUCERS:....................................................................................................................... 14
6.3 HIGH PRESSURE TRANSDUCERS (OPTIONAL):............................................................................................................ 14
7.0 TEMPERATURE EFFECTS......................................................................................................................................15
7.1 AMBIENT TEMPERATURES: ........................................................................................................................................ 15
7.2 GAS TEMPERATURE ................................................................................................................................................... 15
8.0 DIFFERENTIAL PRESSURE....................................................................................................................................16
8.1 TYPICAL PRESSURE DROPS................................................................................................................................ 16
8.2 CHANGES IN DP WITH CHANGES IN LINE PRESSURE................................................................................... 16
8.3 DP INCREASE DUE TO FOULING OF THE TRANSDUCER: ............................................................................................. 17
9.0 CALIBRATION........................................................................................................................................................... 18
9.1 CALIBRATION PROCEDURES............................................................................................................................. 18
10.0 MAINTENANCE......................................................................................................................................................... 20
10.1 TRANSDUCERS:.......................................................................................................................................................... 20
10.2 POWER SUPPLY:......................................................................................................................................................... 20
11.0 ACCESSORIES ........................................................................................................................................................... 21
11.1 OPTIONS AND ACCESSORIES............................................................................................................................. 21
11.2 DOUBLE POINT RELAY FLOWMETER/ALARM (DNALL-P):....................................................................................... 21
11.3 TOTALIZERS (TNALL-P):.......................................................................................................................................... 21
11.4 CHASSIS MODEL (NALL-C):..................................................................................................................................... 22
11.5 CURRENT CONVERTER (NALL-P/CC):.......................................................................................................................22