Flow Transmitters and
Flow Sensors

In-Line Flow Rate Transmitters
(For 1/4 To 2 Inch Pipe Sizes)

Engineering Specifications
The in-line flow rate monitor/transmitter shall:

• be factory calibrated for 4-20mA, 0-1mA, 0-5Vdc and 1-5Vdc.
• use the variable annular orifice technique with compression spring recovery.
• not require inlet or outlet straight plumbing or require vertical pipe mounting
• have measuring accuracy of +/-2.5% of full scale in the center third of the measuring range and +/-4% of full scale accuracy over the entire flow measuring range.
• have a stainless steel sharp-edged orifice.

• Simple to Install :
All transmitters are factory calibrated and ship fully assembled. Simply install the transmitter into your system and apply power.

• Industry Standard Outputs:
Transmitters provide proportional analog outputs of 4-20mA, 0-1mA, 0-5Vdc and 1-5 Vdc¹. These outputs will drive popular data acquisition devices, meters and analog input cards.

• Direct Reading or Optional Digital Display:
All transmitters provide a visual indication of flow rate integral to the transmitted output. For improved readability, an integral digital display is available.

• Weather-Tight Construction:
The sealed, corrosion resistant, enclosure allows installation in environments where liquid tight seals are required.

• Rugged and Reliable:
Without delicate internal components to break, abrade or corrode, the Lake flow transmitter will provide many years of low maintenance service.

• Compatible With Lake Monitor's R100 & R/T100:
The Lake flow rate transmitter and analyzer combine to make a powerful flow instrument capable of monitoring rate and total flows.

Materials of Construction: Wetted Components

	Aluminum	Brass	Stainless Steel
High-pressure casing, end ports and tapered shaft	Aluminum	Brass	#304 Stainless Steel
Seals	Buna-N (STD), EPR, Viton® or Kalrez®	Buna-N (STD), EPR, Viton® or Kalrez®	Viton with Teflon® backup (STD), Buna-N, EPR or Kalrez®
Transfer Magnet	Teflon® coated Alnico	Teflon® coated Alnico	Teflon® coated Alnico
Floating Orifice Disk	Stainless Steel	Stainless Steel	Stainless Steel
All other internal parts	Stainless Steel	Stainless Steel	Stainless Steel

Teflon, Viton and Kalrez are registered trademarks of duPont de Nemours & Co.

Materials of Construction: Non-Wetted Components

	Aluminum	Brass	Stainless Steel
Enclosure	Series 3: polycarbonate Series 4: polyester Series 5: polycarbonate and PVC	Series 3: polycarbonate Series 4: polyester Series 5: polycarbonate and PVC	Series 3: polycarbonate Series 4: polyester Series 5: polycarbonate and PVC
Window Seals	Buna - N	Buna - N	Buna - N

Performance Specifications:

Measuring Accuracy:	2.5% of full-scale in the center third of the measuring range; 4% of full-scale over the entire scale range.
Repeatability:	1% of full-scale
Flow measuring range:	0.05-150 GPM (0.2-560 LPM)
Pressure differential:	see our BASIC data sheet for graphs. Gases: see pneumatic
Maximum operating pressure:	aluminum and brass monitors: 3500 PSIG (240 Bar) stainless steel monitors: 6000 PSIG (410 Bar)
Maximum operating temperature:	fluid: 240F (116C) ambient: 180F (82C)
Pressure differential:	< 30 PSI
Standard calibration fluids:	Oil monitors: DTE 25 @ 110F (43C), 0.873 sg Water monitors: tap water @ 70F (21C), 1.0 sg Air monitors: air @ 70F (21C), 1.0 sg and 100 PSIG

Electronic Transmitter Performance

Power Requirements:	12-35 Vdc, connections via screw terminal
Load Driving Capacity:	4-20mA: Load resistance is dependent on power supply voltage. Use the following equation to calculate maximum load resistance: Max Loop Load (ohms) = 50(Power supply volts - 12). 0-5Vdc: Minimum load resistance 1000 ohms. 0-1mA: Maximum load resistance 100 ohms. 1-5Vdc: Minimum load resistance 25K ohms
Transmission distance:	4-20mA, 0-1mA and 1-5Vdc: limited only by wire resistance and power supply voltage. 0-5Vdc: <200 feet recommended.
Digital display:	3.5 digits, 0.5" digit height, LCD
LED indicator:	provides power indication, intensity increases with flow rate
Over-current protection:	self limiting at 35mA
Resolution:	infinite
Isolation:	Inherently isolated from the process.
Response time:	<0.1 seconds

Mechanical

Dimensions	Series 3	Series 4	Series 5	Series 5
A	6-9/16" (167mm)	7-5/32" (182mm)	3-1/2" (90mm)	3-1/2" (90mm)
B	3-11/32" (85mm)	3-9/16" (90mm)	10-1/8" (258mm)	12-5/8" (322mm)
C	3-5/32" (80mm)	3-9/16" (90mm)
D	1-7/8" (47mm)	1-7/8" (47mm)
Port Sizes	NPTF: 1/4", 3/8", 1/2" SAE: #6, #8, #10 BSP: 3/8", 1/2"	NPTF: 3/4", 1" SAE: #12, #16 BSP: 3/4", 1"	NPTF: 1-1/4",1-1/2" SAE: #20, #24 BSP: 1-1/4", 1-1/2"	NPTF: 2" SAE: #32 BSP: 2"