M-200 Series
High flow,
Adjustable flow switch
with right-angle flow
Features Description
• Field adjustable - Infinite flow range The M-200 Series flow switches are engineered and field tested for
• High Repeatability sensing increasing and decreasing flow rates of gases or liquids. Pres-
sure variation effects are minimal. This series features such versatility,
• Extremely sensitive
economy, and accuracy that they can be used in virtually any applica-
• Minimum pressure drop tion requiring fool-proof inexpensive flow detection.
• Position Insensitive
Operation
The flow switch is activated
by flow forcing a piston kept
in place by a spring to travel
past a reed switch. This pro-
vides a positive signal after a
certain amount of travel. Set
point adjustment is controlled
by adjusting the positioning of
the reed switch.
Illustrated is the M-200-B Model
with 1/2” ports.
Applications
• Cleaning Tools in the semiconductor industry
• Cooling systems
• Water treatment systems
• Process flows
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Measurement Specifications
3/8”, 1/2”, SAE8: Air : 1 - 50 scfm
Water : 0.03 - 5 gpm
Calibration Range * 3/4”: Air : 2 - 100 scfm
Water : 0.2 - 10 gpm
* Maximum flows through switch are higher.
For higher flow settings, contact factory.
Set Point Accuracy ±10% maximum
Repeatability ± 2%
Hysteresis 30%
• Acrylic • 316 Stainless Steel
Material Versions * • Alumunium • PTFE
• Brass
* Other materials available on request.
• 3/8” FNPT • 1/2” FNPT
Port Sizes
• 3/4” FNPT • SAE8
Custom Versions Available
Malema welcomes the opportunity to apply its flow sensor experience to work for its cusomers. Please contact the factory
for any special requirements; such as ports, extreme temperature and pressure capabilities, etc.
Design Considerations/Construction
The M-100 Series comprises a Body, Piston, Endplugs, O-ring seals, and adjustment mechanism. Selecting a Flow Switch
begins with selecting the body; this series is available in a number of materials. Adjustability is achieved by means of an
adjustment screw controlling a bypass. Construction of the piston is important from a design perspective. We manufacture
three (it is critical to select the correct piston for your application): 316 Stainless Steel, Teflon Encapsulated, and Special All-
Metal piston.
(1) The standard piston is a 316 Stainless Steel piston with epoxy to hold the magnet in place. This piston is recommended
for non-aggressive fluids and inert gases. Stainless Steel retaining rings are typically used with this piston type.
(2) The second piston that is available is a Teflon Encapsulated one. This piston is a magnet that has Teflon molded around
it and then machined to the appropriate configuration. These pistons are primarily used in Teflon flow switches and also
in other flow switch bodies (typically 316SS and Acrylic bodies) where customers prefer a piston that does not have epoxy
in the fluid path; as well as a piston that is impervious to aggressive fluids and gases. This piston is highly recommended
for medical applications. Hysteresis on these pistons does tend to be slightly higher (10 to 15%) than metal pistons due to
frictional effects, weight, and surface adhesion considerations. Prior to selecting this piston, fluid temperatures and fluid
compatibility with Teflon must be taken into account because certain aggressive chemicals at specific temperatures tend to
swell Teflon causing the piston to change shape resulting in failure of the product. Stainless or PTFE-coated retaining rings
can be used with this piston, along with a stainless spring (also coated).
(3) The third piston that is available is a Special All-Metal piston with no epoxy (only available in 316SS). This piston is fabri-
cated in a proprietary process with only one weld seam (leak tested) which presents an all 316SS surface to the fluid path.
This piston is recommended for those applications where the piston could experience a lot of cycling wear. This piston has
been tested to 250,000 cycles at 125 psi. Stainless Steel retaining rings are recommended for this piston type.
Corporate Headquarters West Coast Headquarters Asia Headquarters
1060 S Rogers Circle 2225 Martin Avenue Suite I 29 Woodlands Industrial Park E1 Northtech Unit #
Boca Roton, FL 33487 Santa Clara, CA 95050 02-06 Singapore 757716
P: (561) 995-0595 F: (561) 995-0622 P: (408) 970-3419 F: (408) 970-3426 P: (65) 6482-3533 F: (65) 6484-4231
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Standard Specifications by Materials
Housing Acrylic Brass 316SS PTFE
Piston* PTFE PTFE PTFE PTFE Encapsulated
Spring Stainless Steel PTFE Coated Stainless Steel
Retaining Ring* Stainless Steel PTFE Coated Stainless Steel
Pressure and Temperature
Specifications 200
Maximum Operating (psig) 400 1,500 3,000 200
Burst (psig) 77 C (170oF) 3,000 5,000 600
Maximum Operating Temperature 149 C (300oF) 149 C (300oF) 149 C (300oF)
Reed Switch Data (Electrical Ratings) 10 Watts SPST or 3 Watts SPDT (Hermetically Sealed) UL Recognized. File E47258.
Reed Switch Operating Temperature -40oC to 125oC
200 VDC (170 VDC for SPDT)
Switching Voltage 250 VDC (200 VDC for SPDT)
Breakdown Voltage 10 Watts (3 Watts for SPDT)
DC Resistive 10 VA (3VA for SPDT)
AC Resistive 0.5 A (0.25 A for SPDT)
Switching Current 1.2 A (0.5A for SPDT)
Lead Wires No. 24 to 18 AWG. 18” Length, Polymeric UL Recognized or Belden cable with con-
nectors to suit
Lead Wires Color SPST: 2 Blue wires; SPDT: Green - Common, Yellow - Normally Closed, Orange -
Normally Open
Flow Calibration (Higher accuracy units available)
Set Point Accuracy 10% maximum
Set Point Differential (Deadband) 30% (lower hysteresis on request)
Repeatability ± 2% maximum
* See “Design Considerations/Construction” above
Reed Switch Ratings as Recognized by UL
SPST 120 V ac 0.1 A general purpose
24 V dc 0.25 A resistive
50V dc 0.25 A resistive
SPDT 120 V ac 0.1 A general purpose
10 V dc 0.25 A resistive
24 V dc 0.1 A resistive
Corporate Headquarters West Coast Headquarters Asia Headquarters
1060 S Rogers Circle 2225 Martin Avenue Suite I 29 Woodlands Industrial Park E1 Northtech Unit #
Boca Roton, FL 33487 Santa Clara, CA 95050 02-06 Singapore 757716
P: (561) 995-0595 F: (561) 995-0622 P: (408) 970-3419 F: (408) 970-3426 P: (65) 6482-3533 F: (65) 6484-4231
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Installation & Maintenance
This product can be mounted in any orientation. Adequate filtration and sealing procedures should be used when mounting
in flow lines. For detailed directions, please refer to our “Installation and Maintenance” sheet.
Certifications
UL and Canadian UL
UL and Canadian UL Recognized for ordinary locations. File E138467
CE Compliance
Meet the intent of Directive 89/336/EEC for Electromagnetic Compatibility and Low Voltage Directive 73/23/EEC for Product
Safety. Compliance was demonstrated to the following specifications as listed in the Official Journal of the European Com-
munities: EMC Directive 89/336/EEC: EN 55011, Class B Radiated Emissions, EN 50082-1 (Immunity): IEC 801-2, Electrostatic
Discharge Immunity, IEC 801-3, RF Electromagnetic Field Immunity; Low Voltage Directive 73/23/EEC: EN 61010-1, Safety
Requirements for electrical equipment for measurement, control, and laboratory use.
Cv
Cv values available upon request.
Dimensional and Cut-Away Drawings
Illustrated is the M-200 Model with 3/8” ports.
Housing A B
Acrylic 1.25” 0.625”
Aluminum 1” 0.500”
Brass 1” 0.500”
316SS 1” 0.500”
Teflon 1.25” 0.625”
Corporate Headquarters West Coast Headquarters Asia Headquarters
1060 S Rogers Circle 2225 Martin Avenue Suite I 29 Woodlands Industrial Park E1 Northtech Unit #
Boca Roton, FL 33487 Santa Clara, CA 95050 02-06 Singapore 757716
P: (561) 995-0595 F: (561) 995-0622 P: (408) 970-3419 F: (408) 970-3426 P: (65) 6482-3533 F: (65) 6484-4231
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Dimensional and Cut-Away Drawings (continued)
Illustrated is the M-200 Model with 1/2” ports.
Housing A B
Acrylic 1.25” 0.625”
Aluminum 1” 0.500”
Brass 1” 0.500”
316SS 1” 0.500”
Teflon 1.25” 0.625”
Illustrated is the M-200 Model with 3/4” ports.
* Note: The M-200 Model with 3/4” ports is only available in Brass, PTFE and 316 SS
Teflon®, Kalrez® and Viton® are registered trademarks of DuPont.
Corporate Headquarters West Coast Headquarters Asia Headquarters
1060 S Rogers Circle 2225 Martin Avenue Suite I 29 Woodlands Industrial Park E1 Northtech Unit #
Boca Roton, FL 33487 Santa Clara, CA 95050 02-06 Singapore 757716
P: (561) 995-0595 F: (561) 995-0622 P: (408) 970-3419 F: (408) 970-3426 P: (65) 6482-3533 F: (65) 6484-4231
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Dimensional and Cut-Away Drawings (continued)
Illustrated is the M-200 Model with SAE8 ports.
* Note: The M-200 Model with SAE8 ports is only available in Brass and 316 Stainless Steel
Factory Preset Information
The M-200 is an adjustable flow switch. The flow set point can be set at the factory, upon request. Proper calibration of the
set point requires the following information. When purchasing a flow switch that needs to be factory preset, use the “Set
Point Calibration” form on page i-vi or provide this information on the purchase order.
•Calibration set point,
• Increasing or decreasing flow,
• Fluid type (i.e. liquid or gas),
• Density or specific gravity,
• Viscosity,
• System pressure and temperature,
• Flow direction (i.e. upward or downward), and
• Mounting orientation (i.e. horizontal or vertical).
Ordering Information
Standard Part Numbering
M - Model - Material Port Switch
M - 200 - S 1 1
200 A - Aluminum 3 - 3/8” 1 - SPST N.O.
B - Brass 4 - 1/2” 3 - SPDT
P - Acrylic 6-3/4”
S - 316 Stainless
T - PTFE
* The M-200 with 3/4” ports is ONLY available in the Brass,PTFE or 316 SS body material.
The M-200 in Brass or 316 Stainless Steel is also available with SAE 8 ports.
Corporate Headquarters West Coast Headquarters Asia Headquarters
1060 S Rogers Circle 2225 Martin Avenue Suite I 29 Woodlands Industrial Park E1 Northtech Unit #
Boca Roton, FL 33487 Santa Clara, CA 95050 02-06 Singapore 757716
P: (561) 995-0595 F: (561) 995-0622 P: (408) 970-3419 F: (408) 970-3426 P: (65) 6482-3533 F: (65) 6484-4231
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