Flow Switches & Sensors
Model 345 Electric Flow Switch
This Model is designed with a pointer for visual flow indication and an adjustable SPDT Reed Switch to be set for desired flow settings. A spring-loaded vane adjusts with the flow for indication. Dial, pointer, switch are in separate housing.
Body: Bronze
Seals: Viton
®* O-Rings
Window: Acrylic
Model Size NPT Case Height Case Width Overall Width Rating Switch
Rating
  345 1/2
3/4
1
1-1/2
2
3-5/8
3-5/8
3-5/8
3-5/8
4-1/2
3-5/8
3-3/4
3-3/4
4-3/4
6-1/2
3-5/8
3-3/4
3-3/4
4-3/4
6-1/2
125
PSIG
@
200F
15A @ 125V
7A @ 250V
 
Model 357 & 373 Paddle Type Flow Switch
This Model is mounted in a vertical position from a tee-mounted in-line in a horizontal pipe system. The system pipe size can be between 1" and 4". The paddle is trimmed to the appropriate mark with tin snips. Line flow moves the paddle and actuates the switch. The unit comes with No. 18 AWG 24" long polymeric lead wires. The unit is bi-directional.
Max Voltage is 240V.
Max Pressure Drop: 3 PSIG
Model Housing Paddle Other Wetted Max PSIG Max. TempF Rating
357 Brass 302SS  316SS CeramicTeflon®*  2000   300  20VA
SPDT
373 316SS
Note: Consult sales office for actuation and de-actuation set points.
Model 334, 364, & 045 Shuttle Type Flow Switch
As liquid flow increases to the actuation setting, a magnet-equipped shuttle is displaced. When displaced by fluid flow, this shuttle actuates a hermetically sealed, SPDT 20VA reed switch within the unit stem. A compression spring provides shuttle return when flow decreases. Maximum temperature range for Model 045 is 200Fand 300F for Model 334 & 364. Seals are Viton
®*.
Model Sizes NPT Housing Setting Range GPM Operating Pressure Rating
045 1" only Bronze Adjustable 1 to 15 400
PSIG
@
100F
334 1" to 2" Bronze Fixed 0.5 to 100
364 1" to 2" 316SS Fixed 0.5 to 50
Note: For Models 334 & 364 a switch setting must be specified.
Model 376 & 377 Piston Type Flow Switch
These Models have fixed and adjustable flow set points for liquids, air and gases. The repeatability is 1% maximum deviation. Seals are Viton
®*. Maximum operating pressure is 1000 psig. Maximum operating temperature is 300F.
Model NPT Size Housing & Piston Setting Range
376A
376B
376C
376D
 1/2   Brass  Adjustable   0.5 to 20 GPM 
316SS
Brass 1 to 75 SCFM or
3 to 160 SCFM
316SS
377A
377B
1/4  Brass Fixed  0.1, 0.25, 0.50, 0.75,
1.00, 1.50 GPM
316SS
Note: for other Models available consult sales office.

  *Viton® is a registered trademark of DuPont Dow Elastomers
*Teflon
®  is a registered trademark of DuPont 
 
Catalog Page 51
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Toll Free: 1-888-463-7678

Email: info@johnernst.com

Mailing Address
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Sparta, NJ 07871
Physical Address
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Sparta, NJ 07871