Catalogue - PTTF Ultrasonic Product Brochure - PRESO - (Version JPG)

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Liquid flow-meter, Valve, Flow-meter, Differential pressure flow-meter, Ultrasonic flow-meter

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PT TF Transit Time Ultrasonic Flow Meter

Technology and Specifications

Principles of Operations ^T°P ^View ^of ^PiP^e

Transit time flow meters utilize two transducers which function as both ultrasonic transmitters and receivers. The flow meters operate by alternately transmitting and receiving a frequency modulated burst of sound energy between the two transducers. The burst is first transmitted in the direction of fluid flow and then against fluid flow. Since sound energy in a moving liquid is carried faster when it travels in the direction of fluid flow (downstream) than it does when it travels against fluid flow (upstream), a differential in the times of flight will occur. The sound's time of flight is accurately measured in both directions and the difference in time of flight calculated. The liquid velocity (V) inside the pipe can be related to the difference in time of flight (dt) through the following equation:

V = K*D*dt, where K is a constant and D is the distance between the transducers.


	Specifications	Reflect-Mode Configuration Transit Time
	DESCRIPTION	SPECIFICATION

	Liquid Types	Most clean liquids or liquids containing up to 40% suspended solids or aeration
	Power	11-30 VDC @ 0.25 A
	Velocity	0.1 to 40 FPS (0.03 to 12.4 MPS)
	Inputs/Outputs	4-20 mA Output (standard)
		Resolution 12-bit for all outputs
		Power Source
		Insertion loss 5 V maximum
		Loop impedance 900 Ohms maximum
		Isolation Can share ground common with power supply - isolated from piping system
		Turbine Frequency Output / TTL-Pulse Output (standard)
		Switch selectable
		Type Non-ground referenced AC / Ground referenced square wave
		Amplitude 100 mV peak to peak minimum / 5 VDC
		Frequency range 0 - 1,000 Hz
		Duty cycle 50% ±10%
	Display	2 line x 8 character LCD; 0.7", 7 segment top row; 0.35", 14 segment bottom row
		Rate: 8 maximum digits, lead zero blanking
		Total: 8 maximum digits, exponential multipliers from -1 to +6
	Units Engineering: feet, gallons, fts, million-gal, barrels (liquor & oil), acre-feet, lbs, meters, ms, liters, million-liters, kg
		Rate: sec, min, hr, day
	Ambient Temperature	General purpose: 0 °F to +185 °F (-20 °C to +85 °C)
		Hazardous locations: 0 °F to 105 °F (-20 °C to +40 °C)
	Liquid Temperature	0 °F to +185 °F (-20 °C to +85 °C)
	Enclosure	NEMA 3 (Type 3) ABS or polycarbonate
	Transducer	CPVC, Ultem®, brass or stainless steel hardware
	Line Sizes	1/2" to 100" (12 mm to 2540 mm)
	Line Materials	Carbon steel and stainless steel ANSI pipe; copper and plastic tubing
	Accuracy	±1% of reading at rates above 1 FPS (0.3 MPS)
		±0.01 FPS (0.003 MPS) of reading at rates lower than 1 FPS (0.3 MPS)
	Response Time	0.3-30 seconds, adjustable
	Protection	Reverse-polarity, surge suppression
	Approvals	General requirements: ANSI/ISA 582-01
		Hazardous locations: ANSI/ISA 12.12.01
		Class I Div. 2, Groups C & D (Integral systems only)
		CSA C22.2 No. 213, E79-15-95 (PTTF3 and PTTF4 models only)
	UltraLink Utility	Windows® software utility, requires serial communication cable and Windows® 95, 98, 2000 or XP

2 1-800-632-7337

PTTF Ultrasonic Product Brochure - PRESO - #2

Liquid flow-meter, Valve, Flow-meter, Differential pressure flow-meter, Ultrasonic flow-meter