McMillan Model 501 FLO-SWITCHES are capable of measuring extremely low liquid flow rates from 13 mL/minute up to 10 L/minute with a full scale accuracy of ±1.0% or better!
A wide variety of fluids may be measured. Repeatable results are achieved using a patented Pelton-type microturbine wheel. This proven design has been providing precision results since 1988 and has developed a well deserved reputation for continuous operational service for many years without failure.
Because of the compact size and economical cost of these products, the Model 501 FLO-SWITCHES are suitable for a wide variety of industrial, commercial, laboratory and O.E.M. applications. Some sample applications include high/low alarms for hydrocarbon fluids, fuels, light oils, solvents, coolant, pesticides, mild acids, alkalis, and deionized water. Either plastic or metal construction may be selected.
Model 501 Features & Options
ELECTRICAL CONNECTIONS
All units provide an integrated cable terminated with pigtail leads.
FLOW RANGES
Flow ranges from 13-100 mL/minute up to 1.0-10.0 L/minute are available. Consult the factory for custom requirements.
FLUID CONNECTIONS
All units have compression type tube fittings as standard. Many alternate fitting types and sizes may be selected as noted in the Product Configurator.
INDICATORS
Integrated LEDs provide basic flow rate and power indication.
POWER
Choose from 12 VDC Power or 24 VDC Power.
RELAY OUTPUTS
All units may be ordered with either a normally closed (NC) or normally open (NO) solid state relay configuration. For NC units, contacts are closed below setpoint. For NO units, contacts are open below setpoint.
REPEATABILITY & HYSTERESIS
All models feature a standard ±0.50% F.S. repeatability specification. Switching hysteresis is ±2.0% or better.
SET POINT ADJUSTMENT
Units may be ordered with a preset setpoint (set at the factory) or field-adjustable setpoints. Units with field adjustable setpoints may be adjusted using the integrated potentiometer. Units preset at the factory may not be adjusted in the field.
WETTED MATERIALS
The wetted materials vary depending on the part number. See the specifications for further details. Viton O-Rings are fitted as standard but may be replaced with EPDM for improved compatibility.
Specifications
- Accuracy (including linearity, best fit straight line):
- ±1.0% Full Scale
- Repeatability:
- ±0.5% Full Scale
- Pressure Rating:
- Ryton body: 100 psig (6.9 bar)
Stainless steel body: 500 psig (34.5 bar) - Temperature Rating (Environment):
- Operating Range: 5 to 55ºC
Storage Range: 0 to 70ºC - Temperature Sensitivity:
- ±0.2% F.S. or less per ºC
- Wetted Materials:
- Ryton
316 Stainless
Epoxy
Glass
Sapphire - O-Ring Material:
- Standard: Viton
Q Suffix: EPDM - Fitting Material:
- Acetal
Stainless Steel - Recommended Filtration:
- 25 microns or less
- Compatible Liquids:
- Low viscosity (<10 cS)
Translucent or tranparent
Minimum amount of entrained air - Power Requirements:
- Standard: 12 VDC @ 75 mA (11.5-15 VDC)
E Suffix: 24 VDC @ 40 mA (18-25 VDC) - Typical Response Time:
- Typically <1 second for 97% of final value
- Reliability:
- 100,000 hours MTBF (testing ongoing)
- Approvals/Certifications:
- CE Approved
89/336/EEC (EN 55011 & EN 50082-1)
73/23/EEC Low Voltage Directive - Ratings:
- Standard: IP10 (NEMA 1)
Y Suffix: IP67 (NEMA 6) - Relay Output Type:
- Electronic FET switch Normally open or normally closed configuration
- Relay Ratings (Maximum):
- Voltage: 24 VDC Current: 250 mA
- Switching Hysteresis:
- ±2.0% Full Scale
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