Process Controls Home
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Flow Alarms and Flow Switches
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Unrestricted Mounting:
Allows the designer to install the monitor in any orientation -- horizontal, vertical or inverted.
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Field Adjustable Alarm Setting:
Only a screwdriver is required to change the flow rate alarm setting.
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Economical Protection:
This monitor can rapidly pay for itself as it "sounds the alarm" on incorrect lubrication or cooling volumes, protecting expensive equipment and reducing downtime.
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Sealed Polycarbonate Housing:
Allows operation in areas where incidental or non-incidental wash-downs can occur.
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Quality Assurance:
Can be an integral part of a quality control system, yielding consistent system operation.
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Simple ON/OFF Logic:
Positive alarm points using 10 A, dry-contact, SPDT switches, reduces the complexity found in standard rotameter OFF/ON/OFF circuits.
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Pre-wired with Cable Disconnect:
The standard Hirschmann inter- connection provides easy installation and service of the FLOW ALARM and the system it is a part of.
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ENGINEERING SPECIFICATIONS:
The in-line flow rate monitor/alarm shall:
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have field adjustable, dry contact, alarm setting(s).
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use the variable annular orifice technique with compression spring recovery.
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not require inlet or outlet straight plumbing or require vertical pipe mounting.
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have a 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.
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have a stainless steel sharp-edged orifice.
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have a weather-tight external construction
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be a Lake monitors No. M _ _ - _ _ _ - _ _ for single alarm applications or N _ _ - _ _ _ - _ _ for dual alarm applications.
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MATERIALS OF CONSTRUCTION:
Wetted Components
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Component
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Aluminum
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Brass
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Stainless Steel
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High-pressure casing, end ports and tapered shaft
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Aluminum
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Brass
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Stainless Steel
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Seals
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Buna-N (STD), EPR and Viton® or Kalrez®
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Buna-N (STD), EPR and Viton® or Kalrez®
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Viton® with Teflon® backup, Buna-N, EPR or Kalrez®
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Transfer Magnet
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Teflon® coated Alnico
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Teflon® coated Alnico
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Teflon® coated Alnico
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Floating Orifice Disk
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Stainless Steel
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Stainless Steel
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Stainless Steel
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All other internal parts
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Stainless Steel
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Stainless Steel
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Stainless Steel
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MATERIALS OF CONSTRUCTION:
Non-Wetted Components
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Component
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Aluminum
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Brass
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Stainless Steel
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Enclosure
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Series 3: polycarbonate
Series 4: polyester
Series 5: polycarbonate and aluminum
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Series 3: polycarbonate
Series 4: polyester
Series 5: polycarbonate and aluminum
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Series 3: polycarbonate
Series 4: polyester
Series 5: polycarbonate and aluminum
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Window Seals
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Buna - N
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Buna - N
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Buna - N
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Teflon, Viton and Kalrez are registered trademarks of duPont de Nemours & Co.
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PERFORMANCE:
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Measuring Accuracy:
±2.5% of full-scale in the center third of the measuring range; ±4% of full-scale over the entire scale range.
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Repeatability:
±1% o
f full-scale
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Flow Measuring Range:
0.05-150 GPM (0.2-560 LPM)
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Maximum Operating Pressure:
Aluminum and Brass Monitors: 3500 PSIG (240 Bar) Stainless Steel Monitors: 6000 PSIG (410 Bar)
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Maximum Operating Temperature:
Fluid: 240ºF (116ºC) Ambient: 180ºF (82ºC)
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Pressure Differential:
See Graphs. Gases: See PNEUMATIC
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Standard Calibration Fluids:
Oil Monitors: DTE 25 @ 110ºF (43ºC), 0.873 sg
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Water Monitors:
Tap water @ 70ºF (21ºC), 1.0 sg
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Air Monitors:
Air @ 70ºF (21ºC), 1.0 sg and 100 PSIG
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Alarm Switch Dead-Band:
4% of full scale
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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).
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MECHANICAL:
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DIM
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Series 3
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Series 4
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Series 5
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Series 5
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A
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6-9/16"
(167mm)
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7-5/32"
(182mm)
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3-1/2"
(90mm)
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3-1/2"
(90mm)
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B
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3-11/32"
(85mm)
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3-9/16"
(90mm)
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10-1/8"
(258mm)
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12-5/8"
(322mm)
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C
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3-5/32"
(80mm)
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3-9/16"
(90mm)
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–
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–
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D
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1-7/8"
(47mm)
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1-7/8"
(47mm)
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–
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Port Sizes
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NPTF: 1/4", 3/8", 1/2"
SAE: #6, #8, #10
BSP: 3/8", 1/2"
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NPTF: 3/4", 1"
SAE: #12, #16
BSP: 3/4", 1"
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NPTF: 1-1/4", 1-1/2"
SAE: #20, #24
BSP: 1-1/4", 1-1/2"
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NPTF: 2"
SAE: #32
BSP: 2"
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PRESSURE DIFFERENTIAL VS FLOW RATE:
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