Precision Air Velocity

Series
PF

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

Items subjuct to schedule b discounts.

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 4-20 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. Stocked models are calibrated for air.

APPLICATIONS

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

PHYSICAL DATA

Accuracy:		±1% FS, ±0.5% of reading over 32 to 122°F ( 0 to 50°C) and 5 to 31 psia (0.35 to 2 kg/cm²)
Repeatability:		±0.2% of F.S.
Response Time:		0.2 seconds to 63% of final velocity value
Gas Pressure:		150 psig (10 kg/cm² G) maximum
Gas Temperature:		-40 to 250°F (-40 to 121°C)
Supply Voltage:		15 to 18 VDC, 300 mA maximum
Output:		4 to 20 mA, linear
Loop Resistance:		400 maximum
Operating Temperature:		32 to 122°F (0 to 50°C)
Wetted Parts:		304 SS probe, glass coated sensor, epoxy
Storage Temperature:		32 to 158°F (0 to 70°)
Probe Dimensions:		¼" (6.35 mm) O.D., 13" (33cm) length
Electrical Connections:		Four wire standard connector
Weight:		0.0 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 _____.

Series
PFH

Series PFH Air Velocity Transmitters measure mass flow rate of air, nitrogen, or other non-combustible gases and delivers a 4-20 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 eternal flow streams for monitoring air flow in ventilation systems, aeration and drying air flow measurement, and test equipment flow sensing.

PHYSICAL DATA

Media:		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
Gas Pressure:		100 psig (7 kg/cm² G) maximum
Gas Temperature:		0 to 150°F (-18 to 66°C)
Supply Voltage:		24 VAC, 0.5 A
Output:		4-20 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°)
Wetted Parts:		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)

STOCKED MODELS

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