Dwyer Series PAFS-1000 Averaging Flow Sensor

$ 7.25$ 52.00

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Product Description

Ideal for Sensing Fan Flow Rates

The Series PAFS-1000 Averaging Flow Sensor is ideal for sensing differential pressure in the inlet section of variable air volume terminal units and fan terminal units. Units can also be used to sense differential pressure at other locations in the main or branch duct systems.

The “H” port senses total pressure and the “L” port senses static pressure. The difference between these signals is the differential, or velocity pressure. For models PAFS-1002 to PAFS-1005, up to four sensing points and lengths of 3-5/32″ to 9-29/32″ (8.02 to 25.26 cm) to accommodate box size diameters of 4″ to 16″ (10.16 to 40.64 cm) are available. For models PAFS-1006 to PAFS -1011, up to 10 sensing points and lengths from 12-1/2″ to 23-29/32″ (31.75 to 60.72 cm) are available to accommodate appropriately sized duct dimensions.

Product Applications

  • Zone control in HVAC systems


Model Description
PAFS-1002 Averaging flow sensor, 3-5/32″ (8.02 cm) insertion length.
PAFS-1003 Averaging flow sensor, 5-13/32″ (13.73 cm) insertion length.
PAFS-1004 Averaging flow sensor, 7-21/32″ (19.55 cm) insertion length.
PAFS-1005 Averaging flow sensor, 9-29/32″ (25.26 cm) insertion length.
PAFS-1006 Averaging flow sensor, 12-1/2″ (31.75 cm) insertion length.
PAFS-1007 Averaging flow sensor, 14-3/4″ (37.47 cm) insertion length.
PAFS-1008 Averaging flow sensor, 17-1/8″ (43.50 cm) insertion length.
PAFS-1009 Averaging flow sensor, 19-13/32″ (49.29 cm) insertion length.
PAFS-1010 Averaging flow sensor, 21-21/32″ (55.01 cm) insertion length.
PAFS-1011 Averaging flow sensor, 23-29/32″ (60.72 cm) insertion length.


Air and compatible gases.
Wetted Materials:
ABS/polycarbonate (UL94-5V).
Temperature Limits:
Operating: 40 to 120°F (4 to 49°C); Storage: -40 to 140°F (-40 to 60°C).
Process Connection:
1/4″ (6 mm) ID, 3/8″ (10 mm) OD tubing.
Mounting Orientation:
Integral flange with gasket.
1 oz (28 g).



Instruction Manual

Catalog Pages

Series PAFS-1000 Catalog Page


CAD Drawing in format .DWG
Adobe Reader in format .PDF


My quesiton is regarding PAFS-1000 series averaging flow sensor. Is the K factor provided in the instruction manual a direct multiplier to the velocity measured? i.e. v_actual = v_measured * K.
You are correct. V_actual = V_measured * K.