Greenheck QEP-18 User Manual

PN 465197

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Supplement for QEP Model

Flow Measurement Sensor

QEP Calibration Data Sheet

Flow Sensor Input and Output:

Select output range so the fans operating point is within the sensors input range. Sensor is calibrated for all three ranges with a density = 0.075 lb/ft3 (square law device) (Equations provided on back)

Output: 0-25 inches wg.

Unit Size Input (SCFM)

12 0-6,309

15 0-6,311

16 0-7,677

18 0-9,412

20 0-11,261

22 0-13,857

24 0-16,660

27 0-20,176

30 0-24,741

33 0-29,685

36 0-35,956

40 0-43,118

44 0-52,099

49 0-62,287

54 0-75,232

60 0-90,770

66 0-108,807

73 0-132,858

Output: 0-50 inches wg.

Unit Size Input (SCFM)

12 0-8,923

15 0-8,924

16 0-10,857

18 0-13,311

20 0-15,925

22 0-19,567

24 0-23,561

27 0-28,533

30 0-34,989

33 0-41,981

36 0-50,850

40 0-60,978

44 0-73,679

49 0-88,087

54 0-106,394

60 0-128,368

66 0-153,876

73 0-187,890

Output: 0-100 inches wg.

Unit Size Input (SCFM)

24 0-33,320

27 0-40,352

30 0-49,481

33 0-59,370

36 0-71,913

40 0-86,236

44 0-104,197

49 0-124,573

54 0-150,464

60 0-181,540

66 0-217,614

73 0-265,717

Connections:

• High Pressure: 1/8 inch NPT female

• Low Pressure: 1/8 inch NPT female

Installation Notes:

• Mount differential pressure transmitter above sensor elevation to eliminate condensation build-up in the differential pressure cell.

• Recommended tubing size is 1/4 inch for runs 25 feet or less. For longer runs, (maximum 100 feet) use 3/8 inch tubing or larger.

GND

SENSOR FE-X

LOWLOW

LOW

HIHI

ELECT ENCLOSURE

4-20mA input

0-10v input

COMMON

1 2 3

LINEAR 4-20mA OUTPUT

TO PANEL GROUND LUG

115VAC, 60HZ, 20VA 6FT CORD PROVIDED

STRAIN RELIEF

24VDC out

1/8" NPTF

FUSE = 0.2AMP, 50V TIME DELAY

EXTERNAL REVIEVER

CONNECTION

MAX LOAD 400ohms

(REMOVE JUMPER)

Sure-Aire™ Flow Equations:

Unit Size Fan Equation

QEP-12 cfm = 345.65*sqrt(∆P/density)

QEP-15 cfm = 345.65*sqrt(∆P/density)

QEP-16 cfm = 420.86*sqrt(∆P/density)

QEP-18 cfm = 515.35*sqrt(∆P/density)

QEP-20 cfm = 616.86*sqrt(∆P/density)

QEP-22 cfm = 759.37*sqrt(∆P/density)

QEP-24 cfm = 912.87*sqrt(∆P/density)

QEP-27 cfm = 1104.91*sqrt(∆P/density)

QEP-30 cfm = 1355.04*sqrt(∆P/density)

QEP-33 cfm = 1625.35*sqrt(∆P/density)

QEP-36 cfm = 1966.53*sqrt(∆P/density)

QEP-40 cfm = 2361.10*sqrt(∆P/density)

QEP-44 cfm = 2853.94*sqrt(∆P/density)

QEP-49 cfm = 3411.00*sqrt(∆P/density)

QEP-54 cfm = 4120.95*sqrt(∆P/density)

QEP-60 cfm = 4972.27*sqrt(∆P/density)

QEP-66 cfm = 5959.86*sqrt(∆P/density)

QEP-73 cfm = 7275.79*sqrt(∆P/density)

∆P = The differential static pressure between the Sure-Aire™ high and low taps.

Standard Density = 0.075 lb/ft

Wiring Schematic for Optional Digital Readout and Transmitter:

Flow Measurement QEP Calibration

Rev. 3 August 2005