Flow Alarms and Flow Switches

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

Engineering Specifications
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 recovery.
• 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% of full scale accuracy over the entire flow measuring range.
• have a stainless steel sharp-edged orifice.
• have a weather-tight external construction

• Unrestricted Mounting:
Allows the designer to install the monitor in any orientation -- horizontal, vertical or upsidedown.

• 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..

• Quality Assurance:
Can be an integral part of a quality control system, yielding consistent system operation.

• 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.

• Field Adjustable Alarm Setting:
Only a screwdriver is required to change the flow rate alarm setting.

• Sealed Polycarbonate Housing:
Allows operation in areas where incidental or non-incidental wash-downs can occur.

• 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.

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 aluminum	Series 3: polycarbonate Series 4: polyester Series 5: polycarbonate and aluminum	Series 3: polycarbonate Series 4: polyester Series 5: polycarbonate and aluminum
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)
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:	see graphs Gases: See pneumatic
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
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).

Mechanical

DIM	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"