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Flow Rate Alarms
 
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For 1/4" - 2" Pipe Sizes

Style M & N

Utilized in applications such as mobile hydraulic equipment and industrial process control, ensures sufficient flows of coolants and lubricants.

UL-APPROVED
Lake Flow Alarms are UL Approved for loads up to 10 amp @ 110/220 VAC.

FIELD ADJUSTABLE ALARM SETTING
Only an allen wrench is required to change the flow alarm setting.

WEATHER-TIGHT CONSTRUCTION
Rugged cast aluminum NEMA type 4X enclosure allows installation in outdoor applications and in environments where liquid tight seals are required.

SIMPLE ON/OFF LOGIC
Positive alarm points using 10 A., dry-contact, SPDT switches reduce the complexity found in standard rotameter OFF/ON/OFF circuits.

cePRE-WIRED WITH CABLE DISCONNECT
The standard Hirschmann interconnection provides easy installation and maintenance of the FLOW ALARM and the system it is a part of.

UNRESTRICTED MOUNTING
Allows the designer to install the monitor in any orientation-horizontal, vertical or inverted.

 

ECONOMICAL PROTECTION
This monitor rapidly pays for itself as it “sounds the alarm” on incorrect pneumatic, lubrication or cooling volumes, protecting expensive equipment and reducing downtime.

QUALITY ASSURANCE
Can be an integral part of a quality control system, yielding consistent system operation.



Engineering Specification

THE IN-LINE FLOW RATE MONITOR/ALARM SHALL:

  • Have field adjustable, dry-contact, alarm setting(s).
  • Use the variable annular orifice technique with compression spring recoil.
  • Not require inlet or outlet straight plumbing, or require vertical pipe mounting.
  • Have a measuring accuracy of ±2.5% of full scale in the center third of the measuring range, and ±4% in upper and lower thirds.
  • Have a maximum working pressure rating of 3500 or 6000 PSIG for liquids.
  • Have a maximum working pressure rating of 600 or 1000 PSIG for gasses.
  • Have a stainless steel sharp-edged orifice.
  • Have a weather-tight NEMA type 4X external construction.
  • Be Lake Monitors No. M _ _ ? _ _ _ ? _ _ for single alarm applications, or N _ _ ? _ _ _? _ _ for dual alarm applications.

Materials of Construction (Wetted Components)

Aluminum

Brass

Stainless Steel

High-pressure casing, end ports and tapered shaft

Aluminum

Brass

#303 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 is a registered trademark of DuPont de Nemours & Co.
Viton and Kalrez are registered trademarks of Dow DuPont Elastomers


Materials of Construction (Non-Wetted Components)

Aluminum

Brass

Stainless Steel

Enclosure & Cover

Aluminum

Aluminum

Aluminum

Seals

Buna-N

Buna-N

Buna-N

Window

Pyrex®

Pyrex®

Pyrex®

Din Connector

Polyamide

Polyamide

Polyamide

Pyrex is a registered trademark of Corning Inc.


Performance

Measuring accuracy:

±2.5% of full-scale in the center third of the measuring range; ±4% in upper and lower thirds

Repeatability:

±1% of full-scale

Flow measuring range:

0.05-150 GPM (0.2-560 LPM); 1.5-1300, SCFM (0.75-610 SLPS)

Pressure differential:

Click here for specific pressure differential graphs

Maximum operating pressure:

aluminum and brass meters: 3500 PSIG (240 Bar)
stainless steel meters: 6000 PSIG (410 Bar)

Maximum operating temperature:

media: 240°F (116°C), ambient: 180°F (82°C)

Standard calibration fluids:

Oil meters: DTE 25® @ 110°F (43°C), 0.873 sg
Water metes: tap water @ 70°F (21°C), 1.0 sg
Air meters: air @ 70°F (21°C), 1.0 sg and 100 PSIG (6.8 Bar)

Enclosure:

NEMA type 4X (UL Approved)

Alarm switch dead-band:

4% of full scale

Alarm switch contacts:

SPDT (dry contact), UL/CSA rating: 10 amps and 1/4 hp, 125 or 250 VAC. 1/2 amp, 125 VDC; 1/4 amp, 250 VDC; 3 amps, 125 VAC “L” (lamp load)

Filtration requirements:

74 micron filter or 200 mesh screen minimum

DTE 25 is a registered trademark of Exxon Mobil


Mechanical Size Code
Flow Rate Alarm CAD

DIM

Series 3

Series 4

Series 5

Series 5

A

6-9/16"
(167mm)

7-5/32"
(182mm)

10-1/8"
(258mm)

12-5/8"
(322mm)

B

2-3/16"
(56mm)

2-15/16"
(75mm)

3-13/16"
(97mm)

3-13/16"
(97mm)

C

4"
(101mm)

4-1/2"
(114mm)

5-5/16"
(135 mm)

5-5/16"
(135 mm)

D

1-7/8"
(47mm)

1-7/8"
(47mm)

1-7/8"
(47mm)

1-7/8"
(47mm)

E

4-7/8"
(128mm)

5"
(127mm)

6-3/4"
(172mm)

6-3/4"
(172mm)

F

2-1/4"
(57mm)

2-7/8"
(73mm)

3-3/4"
(95mm)

3-3/4"
(95mm)

Port Size

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"

Note: Consult factory for SAE brass meter requirements.


   
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