Series PFS Smart Air Velocity Transmitter measures mass flow rate of air, nitrogen, or other non-combustible gases and delivers a linear 4 to 20 mA output signal. The smart electronics permit field configuration of flow range and full validation of calibration. Compensate for flow profile variations or specific application conditions with the K-Factor correction feature. Series PFS include user-adjustable high and low alarm outputs and adjustable time response to track flow fluctuations. View flow rate on units with built-in display. All parameters can be quickly programmed via three push buttons or RS-232 and the Windows™ 95 based software (sold separately).

POPULAR MODELS

Model Number	Range	Display	Price
PFS1300204	0 to 4000 SFPM	No	$1100.00
PFS1300210	0 to 10,000 SFPM	No	$1100.00
PFS1300215	0 to 15,000 SFPM	No	$1100.00
PFS13002041	0 to 4000 SFPM	Yes	$1325.00
PFS13002101	0 to 10,000 SFPM	Yes	$1325.00
PFS13002151	0 to 15,000 SFPM	Yes	$1325.00

ACCESSORIES

Model Number	Description	Price
PFS60	Windows Software and Connecting Cable	$85.00

SPECIFICATIONS
Service: Air, nitrogen, or non-corrosive, non-combustible gases.
Wetted Materials: 304 SS probe, glass filled polyester sensor, epoxy, and ceramic.
Accuracy: ±1% FS.
Repeatability: ±0.2% full scale.
Response Time: 0.1 seconds to 63% of final velocity value.
Temperature Limits: -40 to 250°F (-40 to 120°C).
Pressure Limits: 150 psig (10 bar) max.
Supply Voltage: 18 to 30 VDC, 625 mA max.
Output: 4 to 20 mA linear, optical/galvanic isolated; proportional to point mass flow rate or velocity.
Loop Resistance: 700Ω max.
Relay Rating: Maximum 42 VAC/VDC, 140 mA.
Flow Range Adjustment: 50 to 100% FS.
Time Response: Adjustable 1s to 7s.
Electrical Connection: 1/2" female NPT.
Correction Factor Setting: 0.5 to 2.
Housing: NEMA 4X (IP65) powder-coated cast aluminum.
Mounting: 3/8" tube compression fitting (not included).
Computer Requirements: IBM compatible 386 or above and Windows™ 95 or later with minimum 8 MB RAM (16 MB preferred) and one serial port.
Weight: 0.7 lbs (0.30 kg).

Precision Flow Air Velocity Transmitters directly monitor gas mass flow rates of free air flows or single point flows in pipes, ducts and stacks. The 4 to 20 mA output signal is linearly proportional to gas mass velocity without additional compensation needed for pressure and temperature variations. The 304 SS insertion probe contains a velocity sensor to monitor mass flow and a temperature sensor to automatically correct for temperature changes. The probe is directly mounted to a NEMA 2 anodized aluminum enclosure. Popular models are calibrated for air.

APPLICATIONS
Heating, ventilation and air conditioning (HVAC); hood and gas cabinet monitoring; cleanroom and cleanbench face velocity monitoring.

POPULAR MODELS

Model Number	Range	Price
PF1300202	0 to 2000 SFPM	$1015.00
PF1300204	0 to 4000 SFPM	$1015.00
PF1300206	0 to 6000 SFPM	$1015.00

SPECIFICATIONS
Service: Air, nitrogen, or non-corrosive, non-combustible gases.
Wetted Materials: 304 SS probe, glass coated sensor, epoxy.
Accuracy: ±1% FS, ±0.5% of reading over 32 to 122°F (0 to 50°C) and 5 to 30 psia (0.35 to 2 kg/cm²).
Repeatability: 0.2% F.S.
Response Time: 0.2 seconds to 63% of final velocity value.
Temperature Limits: -40 to 250°F (-40 to 121°C).
Pressure Limits: 150 psig (10 kg/cm² G) max.
Supply Voltage: 15 to 18 VDC, 300 mA max.
Output: 4 to 20 mA, linear.
Loop Resistance: 400Ω max.
Operating Temperature: 32 to 122°F ( 0 to 50°C).
Electrical Connection: Four wire standard connector.
Probe Dimensions: ¼" (6.35 mm) O.D., 13" (33 cm) length.
Weight: 0.7 lbs. (0.30 kg).

Suggested Specifications:
Air velocity transmitter shall be an insertion type mass flow meter with accuracy of ±1% FS, +0.5% of reading and a 0.2 second response time. Transmitter shall provide a 4-20 mA output signal linearly proportional to gas mass velocity. Insertion probe shall be constructed of 304 SS with a glass coated sensor assembly. Electronics shall be housed in a NEMA 2 enclosure. Air velocity transmitter shall be Dwyer Model No. PF

The Dwyer Series 640 air velocity transmitter is ideal for a wide range of HVAC measurement and control applications, particularly in complete building control and energy management systems. Designed for use in reasonably clean and dry air streams, applications include multipoint air velocity measurements, supply and exhaust fan tracking, industrial hygiene and clean-room systems, air pollution studies and manufacturing or process control systems.

The Series 640 brings ±2% accuracy (including linearity, hysteresis and repeatability) to these types of demanding applications at a surprisingly low cost. With four field selectable ranges of 0-200, 0-1000, 0-3000 and 0-12,000 FPM, this single transmitter can be supplied off-the-shelf for a variety of different air velocity measurement applications.

The Series 640 transmitter is easily installed with the mounting hardware supplied, including a split flange for securing the sensing probe in the duct. Requiring only 18-24 volts AC or 22-28 volts DC for power and having a two-wire, 4-20 mA output, electrical connections are made quickly and easily by means of a four-wire cable to a plug-in terminal block through a liquid tight cable gland. The NEMA 13 housing is suitable for all indoor industrial, institutional or commercial installations. An optional probe extension is available for larger duct sizes.

The central components of the Series 640 transmitter are the velocity and temperature sensors located in the tip of the probe. The velocity sensor is a constant temperature thermistor which measures the air velocity, referenced to standard conditions, by sensing the cooling effect of the moving air passing over the heated sensor. The power required to maintain the velocity sensor temperature, as provided by the control circuitry in the electronics package, is a function of the air velocity. The velocity sensor is rugged enough to tolerate small particulate contamination and still provide fast response to changes in air velocity. A temperature sensor in the probe tip compensates for a wide range of air stream temperature variations. Each transmitter is individually calibrated at our factory in a computer controlled wind tunnel. During this calibration procedure, the inherent non-linearity of the thermistor velocity sensor is automatically corrected by appropriate programming of an EPROM in a linearizer circuit of the electronics package.

POPULAR MODELS

Model Number	Description	Price
640-0	Air Velocity Transmitter	$493.00

ACCESSORIES

Model Number	Description	Price
A-398	Probe Extension Adapter	$11.50

SPECIFICATIONS
GENERAL
Media: Air
Ranges: 0-200, 0-1000, 0-3000, 0-12,000 FPM (field selectable: referenced to standard conditions)

ELECTRICAL
Power Supply: 18-24 VAC, 22-28 VDC
Output Signal: 4-20 mA DC
Loop Resistance: 0-300 Ohms
Current Consumption: 250 mA Maximum
Warm-up Time: 3 to 5 minutes

PERFORMANCE
Zero Output: 4 mA
Full Span Output: 20 mA

ACCURACY: (% of F.S.)
0-200 fpm range
±5% @ 32-180°F; ±9% @ 0-32°F or 180-200°F
0-1000, 0-3000 or 0-12,000 fpm ranges
±2% @ 32-180°F; ±6% @ 0-32 or 180-200°F

ENVIRONMENTAL
Temperature Ranges: Operating, -32 to 160°F; Storage, 0 to 200°F

MECHANICAL
Weight: 3 Ibs.
Probe length: 12 inches
Cable length: 6 feet

Series PFH Air Velocity Transmitters measure mass flow rate of air, nitrogen, or other non-combustible gases and delivers a 4 to 20 mA output signal directly proportional to gas mass velocity. Thermal sensor design provides accurate flow measurement without additional compensation needed for temperature and pressure variations. Easily install into pipes, ducts, or external flow streams for monitoring air flow in ventilation systems, aeration and drying air flow measurement, and test equipment flow sensing.

POPULAR MODELS

Model Number	Range	Price
PFH130002	0 to 2000 SFPM	$820.00
PFH130004	0 to 4000 SFPM	$820.00
PFH130006	0 to 6000 SFPM	$820.00

SPECIFICATIONS
Service: Air, nitrogen, or non-corrosive, non-combustible gases.
Accuracy in Point Velocity: ±2% FS over 32 to 122°F (0 to 50°C) and 5 to 30 psia (0.35 to 2 kg/cm²).
Repeatability: ±0.2% full scale.
Response Time: 0.2 seconds to 63% of final velocity value.
Pressure Limits: 100 psig (7 kg/cm² G) max.
Temperature Limits: 0 to 150°F (-18 to 66°C).
Supply Voltage: 24 VAC, 0.5 A.
Output: 4 to 20 mA nonlinear; proportional to gas mass velocity.
Load Resistance: 50 ohms minimum, 500 ohms maximum.
Operating Temperature Range: 32 to 122°F (0 to 50°C).
Wetted Materials: 304 SS probe, glass coated sensor, epoxy.
Probe Dimensions: ¼" (6.35 mm) O.D., 13" (33 cm) length.
Housing: Dustproof NEMA 2 anodized aluminum.
Electrical Connection: ¾" NPT conduit connection.
Mounting: ¼" compression fitting (not included).
Weight: 0.7 lbs (0.30 kg).

Phone: 813-971-5001
Fax : 813-971-5117

Omni Controls Inc.
5309 Technology Dr.
Tampa, FL 33647

Toll Free
1-800-783-6664

Sales@Omnicontrols.com

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