CLARK

FSI-T00-000 Impeller Type Flow Sensor

1", 1½ & 2" Pipe Size, Pulse Output

DESCRIPTION

FSI-T00 flow sensors are designed specifically for flow monitoring and control applications in fluidic systems where the materials of construction and performance specifications are suitable.

The sensor features a square wave digital signal proportional to flow. The characteristics of the output signal duplicate existing impeller flow sensor signals making the FSI series sensor compatible with all manufacturers’ control products.

The pulse signal will travel up to 2,000 feet without amplification.

The key elements of this new technology are a proprietary mounting tee, ultra-lightweight impeller and improved processor based electronics giving the FSI series sensor improved performance.

SPECIFICATIONS

Pipe Sizes:  1", 1½", 2"
Wetted Materials:
		Impeller:  HDPE (High Density Polyethylene)
		Shaft: Tungsten Carbide
		O-ring: BUNA N
		Tee, Sensor Housing, Retaining Nut: Type 1 PVC
Pressure Rating:
		Sensor designed to Schedule 40 specifications
		Samples tested to working pressure of 240 PSI
Temperature Range:  32°F to 140°F (0° to 60°C)
Output Signal:
		Frequency Range:  0.3 Hz to 200 Hz
		Output Pulse:  5 msec ±25%
Transducer Excitation:
		Quiescent current 600 uA@8 VDC to 35 VDC max.
		Quiescent voltage (VHigh)= Supply Voltage - (600uA X 
		Supply Impedance)
		On State (VLow)= Max. 1.2 VDC@50mA current limit, 
		(10 Ohm + 0.7VDC)
Velocity Range (See Table 2):  0.25 to 15 FPS
Electrical Cable:
		2 single conductor solid copper U.L. listed #18 AWG leads 
		with direct burial insulation
		Lead length: 48 inches
		Wiring may be extended up to 2,000 feet with direct burial, twisted pair shielded cable

FEATURES

• Molded Mounting Tee: Improved control of dimensions for more consistent measurement and improved performance at low flow.
• Threaded Retaining Nut instead of Retaining Pin: Easier to service in a valve box, more moisture resistance for electronics resulting in longer life.
• Unique 4 Bladed Lightweight Impeller: Measures lower flow rates. Detects flow as low as 20% of published minimum rate of other impeller sensors.
• Smart Electronics Detection System: Sensor electronics contain a micro-processor for better signal filtering and conditioning. Detection circuit also contains superior over-voltage and over-current protection.

Table 1- Dimensions, K Factors
Model	Pipe Size	A=Length Inches (mm)	B=Width Inches (mm)	C=Height Inches (mm)	*K Factor (To read flow rate in GPM)	*Offset
FSI-T10-001	1"	5.625 (143)	1.710 (43)	3.487 (88)	0.320	0.022
FSI-T15-001	1½"	6.188 (157)	2.310 (58)	5.097 (130)	0.650	0.750
FSI-T20-001	2"	7.00 (178)	2.875 (73)	4.573 (116)	1.192	0.938
*Frequency = (GPM/K) - Offset or GPM = Frequency x K + Offset

FLOW SENSOR OPERATING RANGE

FST flow sensors use a rotating impeller to sense the water moving through the closed pipe. The speed of the impeller rotation is proportional to the velocity of the liquid. As the impeller turns, it produces digital pulses. The relationship between velocity and volumetric flow rate is dependent on the size of the pipe and may be calculated using the formula Qgpm = Vfps X D2 X 2.45 where Q is the flow rate in gpm, V is velocity in fps and D is the inside diameter of the pipe in inches. The pipe must be full for the rotational speed of the impeller to accurately reflect flow.

FSI Series flow sensors measure flow over a range from 0.25 fps to 15 fps. Size the flow sensor for the flow rates that need to be measured, not the pipe size. The most common mistake in selecting a flow sensor is to oversize the unit and not be able to measure low flow. The flow sensor will operate at significantly higher velocities than commonly used for sizing pipe. Note: A 2" flow sensor has an operating range high enough for use with 3 or 4 inch diameter pipelines running at lower velocities. If the system flow rate falls below the minimum shown in these tables, use a smaller diameter flow sensor installed in a "meter run"- a section of pipe containing 10 diameters of straight pipe ahead of the sensor and 5 diameters of straight pipe after the sensor.

Table 2- Flow
Model		FSI-T10-001 1”	FSI-T15-001 1½"	FSI-T20-001 2”
	Feet Per Second	GPM	GPM	GPM
Minimum Flow	0.25	0.86	1.8	2.8
	1	3.5	7.24	11.3
	2	7	14.5	23
	3	10.4	22	34
	5	17	36	57
	7	24	51	79
	10	35	72	113
	12	42	87	136
Maximum Flow	15	52	108	170

ORDERING INFORMATION

Model	Size
FSI-T10-001	1"
FSI-T15-001	1½"
FSI-T20-001	2"