Measurements Information

Measurement Ranges Conversion Chart

Engineering Units	Analyzer Type
pure = 100%	percent
air= 20.9% =209,000 ppm	percent
1.0% = 10,000 ppm	percent
0.1% = 1,000 ppm	percent/ppm
0.01% = 100 ppm	ppm
10 ppm = 10,000 ppm	ppm
1 ppm = 1,000 ppm	ppm/ppb
0.5 ppm = 500 ppb	ppm/ppb
0.01 ppm = 10 ppb	ppm

Texas Basic Orifice Factors (Railroad Commission)

ORIFICE DIAMETER INCHES20668	2 (1.939)	2 (2.067)	3 (2.900)	3 (3.068)	4 (4.026)
0.250	396	396	396	396	395
0.375	886	886	884	884	883
0.500	1576	1574	1567	1567	1565
0.625	2477	2471	2451	2449	2443
0.750	3602	3587	3542	3538	3523
0.875	4971	4937	4842	4833	4806
1.000	6619	6549	69357	6341	6293
1.125	8605	8464	8098	8070	7986
1.250	11015	10752	10082	10033	9890
1.375	13975	13505	12331	12246	12010
1.500		16894	14872	14735	14356
1.625			17747	17527	16936
1.750			21012	20668	19764
1.875			24744	24212	22857

Ounce to Inches of Water

Conversion Chart
16 oz. = 27.68” w.c. = 1lb = 2” Hg
15 oz = 25.95” w.c.
14 oz = 24.22” w.c.
13 oz = 22.49” w.c.
12 oz = 20.76” w.c.
11 oz = 19.03” w.c.
10 oz = 17.3” w.c.
9 oz = 15.57” w.c.
8 oz = 13.84” w.c.
7 oz = 12.11” w.c.
6 oz = 10.38” w.c.
5 oz = 8.65” w.c.
4 oz = 6.92” w.c.
3 oz = 5.19” w.c.
2 oz = 3.46” w.c.
1 oz =1.73” w.c.