
Sensor fitting:
1.5 in. NPT or 
ISO 7/1-R 1.5 
thread
Bleed 
valve
O-ring 
seals (2)
Adjustable
length
64 (2.5)
457 
(18)
Cable
7.6 m 
(25')
24 (0.94)
HIGH PERFORMANCE
Adjustable
length
7.5 m (25') 
Integral cable
Sensor fitting:
1.5 in. NPT or 
ISO 7/1-R 1.5 
thread
O-ring 
seal (1)
127
(5.0)
64 (2.5)
24 (0.94)
FLOW SENSORS
FP-2541
Starts at
$
490
⻬ Rugged 316 Stainless
Steel Construction
⻬ Flow Rates as Low as 
0.3 fps
⻬ Installs in a Variety of
Pipe Sizes
⻬ No Magnets in 
Process Fluid
⻬ Hot-Tap Version
Removable Without 
Shutdown
⻬ Uses Standard Pipe
Connections
The FP-2541 and FP-3-1500 Series 
offer the added strength and 
corrosion resistance of stainless 
steel for applications requiring low 
velocity measurement. Unique 
internal circuitry eliminates the need 
for magnets in the process fluid, 
enabling lower flow measurement 
while maintaining the advantages of 
insertion-type sensor design. The 
sensor’s unique rotor/bearing 
design offers low flow measuring 
capability with increased reliability.
SPECIFICATIONS
Output Signal: Open collector, sinking 
Output Frequency: 15 Hz per fps 
Operating Range: 0.3 to 20 fps 
Pressure/Temperature: With standard
FKM O-rings: 250 psi @ 82°C (180°F)
Power Requirements: 5 to 24 Vdc 
Pipe Size Range:
FP-2541: 1.5 to 24" 
FP-3-1500-2B: 1.5 to 36" 
Repeatability: ±0.5% of full range 
Linearity: ±1% of full range
MATERIALS
Sensor Fitting: 316SS 
O-rings: FKM  
Rotor: CD4MCu 
Rotor Bearings: PEEK 
Cable Type: Twisted pair with foil shield 
Cable Length: 7.6 m (25') 
305 m (1000') max
High Performance Flow Sensor
TM
F
FP-3-1500-2B Hot-Tap
Dimensions: mm (in)
FP-2541 flow sensor, $490,
shown with 152 mm (6")
installation ruler, included.
Dimensions: mm (in)
MOST POPULAR MODELS HIGHLIGHTED!
To Order (Specify Model Number)
Model No. Price Description 
FP-2541 $490 High performance flow sensor with 1.5 NPT thread
Accessories
Model No. Price Description 
FP-3-1500-302 $440 Hot-tap installation tool 
FP-3-1500-2B 735 Hot-tap flow sensor with 1.5 NPT 
FP-3-2540-321 70 Replacement rotor and pin for 
Comes complete with 152 mm (6") installation ruler and operator’s manual 
Ordering Examples: FP-2541, high performance flow sensor with 1.5 NPT thread, $490.
thread
units with serial numbers with “A”
F-38
Compatible Meters:  
DPF700 (page M-5), 
FPM-5500 (page F-43), 
FPM-9020A (page F-42)

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