For 1/4" - 2" Pipe Sizes

Flow Rate Alarms, Flow Rate Switch, Lake MonitorsStyle 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:

See Brochure

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.

Download Brochure