Dwyer Instruments SERIES SF2 Catalog Page

1/2˝ FEMALE NPT

[62.31]

[16.27]

SERIES SF2

SIGHT FLOW METERS

SPDT or Pulse Output, Visual Flow Conrmation, Brass Body

Flow Transmitters,

Paddlewheel, In-Line

The Series SF2 Sight Flow Meters combine visual conrmation of ow with a relay or pulse output. The SF2-1 offers a SPDT relay output and the SF2-2 offers a pulse output proportional to the rate of ow. The 4.5-24 VDC pulse output is compatible with

most digital logic families.

FEATURES/BENEFITS

• Brass, solid body construction, one piece composite rotor, and ceramic shaft delivers

durability with broader chemical, temperature, and pressure capabilities

• Set points are fully adjustable over the specied ow range

• The dynamic operation of the rotor guards against jamming and false actuation

APPLICATIONS

• Cooling and lubrication circuits

• HVAC systems

MODEL CHART - SPDT RELAY OUTPUT Model Range (GPM) Power Connection SF2-104

SF2-101 SF2-114 SF2-111 SF2-124 SF2-121 SF2-134 SF2-131

DWYER INSTRUMENTS, INC. 282

2-1/2 [63.5]

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SF2-1 SF2-2

DIMENSIONS in [mm] Model A B C D Model A B C D SF2-104

SF2-101 SF2-114 SF2-111 SF2-124 SF2-121

0.5 to 5.0

4.0 to 20.0

5.0 to 30.0

8.0 to 60.0

3-1/64 [76.6] 3-1/64 [76.6] 3-1/64 [76.6] 3-1/64 [76.6] 3-61/64 [100.41] 3-61/64 [100.41]

• Aggressive chemical metering

• Batching systems

24 VDC 110 VAC 24 VDC 110 VAC 24 VDC 110 VAC 24 VDC 110 VAC

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1/4˝ female NPT 1/4˝ female NPT 1/2˝ female NPT 1/2˝ female NPT 3/4˝ female NPT 3/4˝ female NPT 1˝ female NPT 1˝ female NPT

7/8 [22.23] 7/8 [22.23] 7/8 [22.23] 7/8 [22.23] 1-1/16 [26.99] 1-1/16 [26.99]

2-21/64 [59.13]

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SPECIFICATIONS Service: Liquids compatible with wetted

parts. Wetted Materials: Brass body, ceramic pin, PPS rotor, Polysulfone lens and

uoroelastomer O-ring.

Accuracy: Relay output: ±5%; Pulsed output: ±7% for ranges up to 5.0 GPM, ±15% for ranges up to 60.0 GPM. Temperature Limits: -20 to 212°F (-29 to 100°C). Pressure Limit: 200 psig (13.8 bar) @ 70°F.

Power Requirements: See table.

MODEL CHART - PULSED OUTPUT Model Range (GPM) Power Connection SF2-204

SF2-214 SF2-224 SF2-234

SF2-134 SF2-131 SF2-204 SF2-214 SF2-224 SF2-234

0.5 to 5.0

4.0 to 20.0

5.0 to 30.0

8.0 to 60.0

USA: California Proposition 65

WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov

Side view VAC switch

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models

4-49/64 [121.05]

4.5-24 VDC

Side view VDC switch and

1-1/16 [26.99] 1-1/16 [26.99] 13/16 [20.64] 13/16 [20.64] 1-1/16 [26.99] 1-1/16 [26.99]

Output: SPDT: 1 Amp, 24 VDC resistive;

0.3 Amp, 110 VAC or 4.5-24 VDC pulse depending on model. Electrical Connections: Relay output

models: 20AWG PVC-jacketed, 24˝

cable; Pulsed output models: 22AWG

PVC-jacketed, 24˝ cable.

Process Connections: See table. Set Point Differential: 15% max for

relay output models.

Maximum Viscosity: 200 SSU. Agency Approvals: CE.

1/4˝ female NPT 1/2˝ female NPT 3/4˝ female NPT 1˝ female NPT

transmitter models

2-61/64 [75]

2-21/64 [59.13] 2-21/64 [59.13] 2-61/64 [75] 2-61/64 [75]