GF SIGNET 2550, Quick Start Manual

Page: 12 / 12

page 12 of 12 ‡ SIGNET 2550 InsertionMagmeter
5.8 Custom K-factor calculation
K-factors can be calculated for any pipe using the pipe id and the
ft/s engineering unit options. The procedure is based on the
relationship between the frequency output and the flow velocity:
20 ft/s = 500 Hz. therefore 1 ft/s = 25 Hz.
1. Install the 2550 in pipe according to sec 2.2.
2. Enter the pipe ID into the menu, and select Feet per Second
(FPS) as the engineering unit.
3. Establish a stable flow rate in the pipe. It is not important to
know what the rate is, just that it be stable.
4. Read the flow rate from display and multiply the display value
(ft/s) by 25. (frequency can be verified by monitoring TS2 if
desired.)
Record the result _____ ft/s = ________Hz.
5. Change the display to read in desired engineering units.
Do not change flow rate!
Record the result _____GPM = ________Hz.
6. Divide the flow rate by the frequency result of step 3. Record
the result:
Flow Rate/Hz = A =_______________
7. K = 60 / A = _________________
Example illustrates calculating a custom K-factor in
GPM for pipe with 3.068 in. id.
Unit =
ft/s
Display = 5.2 ft/s
5.2 x 25 = 130 Hz
5.2 ft/s = 130 Hz.
Unit = GPM
Display = 120 GPM
120 GPM = 130 Hz.
A = 120 ÷ 130 = 0.92
K = 60 ÷ 0.92 = 65.2
6. Ordering Information
Mfr. Part No. Code Description
3-2550.100-110 159 000 294 Insertion Magmeter with 2 in. NPT Fitting
3-2550.100-110T 159 000 632 Insertion Magmeter with 2 in. NPT Fitting and Installation Tool
3-2550.100-111 198 840 024 Insertion Magmeter with 2 in. ISO Fitting
3-2550.100-111T 198 840 025 Insertion Magmeter with 2 in. ISO Fitting and Installation Tool
Parts and Accessories
3-2550.355 159 000 296 Magmeter Installation Tool
1500-0101 159 000 239 Cable Connector (0.125 to 0.187 o.d.)
6400-0020 159 000 647 Fuse, Slo-Blo
1222-0439 159 000 235 Gasket, outer cover
3-2550.374 198 840 211 Access cover
1222-0439 198 840 212 Gasket, outer cover
1500-0101 N/A Cable connector (standard) for .125 to .187 o.d. cable
1500-0102 N/A Cable connector (optional) for .187 to .250 od cable
6400-0020 198 829 021 Fuse, 3/4 A slo-blo
3-2550.355 198 820 024 Installation tool
‡ SIGNET
Signet Scientific Company, 3401 Aerojet Avenue, El Monte, CA 91731-2882 U.S.A. • Tel. (626) 571-2770 • Fax (626) 573-2057
For Worldwide Sales and Service, visit our website: www.gfsignet.com • Or call (in the U.S.): (800) 854-4090
GEORGE FGF+ Piping Systems
3-2550.090 (G-12/02) English © Scientific Company 2002 Printed in U.S.A. on Recycled Paper