Malema M-200X Operating Instructions And Quick Start Manual Download Page 4

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2.  The second piston that is available is a PTFE Encapsulated one. The piston is a magnet that has PTFE moulded around it and 

      then machined to the appropriate configuration. These pistons are primarily used in PTFE flow switches and also in other flow 

      switch bodies ( typically 316SS and Acrylic bodies ) where customer 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 piston due to frictional effects, weight,  

    and surface adhesion considerations. Prior to selecting this piston, fluid temperatures, and fluid compatibility with PTFE must 

    be taken into account because certain aggressive chemicals at specific temperatures tend to swell PTFE causing the piston to 

    change shape resulting in failure of the product. Stainless or PTFE retaining rings can be used with this piston.

3.  The third piston that is available is a Special All-Metal piston with no epoxy ( only available in 316SS ). This piston is fabricated 

     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 for low pressure 

      applications and an orifice disc ( See Universal Mounting Diagram ) is recommended for high pressure ( 125 psi ) applications.

SPST vs SPDT

The standard unit is provided with a 

SPST N.O. 

(N.O = Normally open at rest) dry reed switch. Increasing flow past point will close 

(activate) the switch. Decrease flow will open (de-activate) the switch).

SPST NC. 

(N.C = Normally close at rest) models are closed at rest. Increasing flow pass set point opens the switch and decreasing 

flow to set point will close the switch( Typically used to detect loss of flow condition in overall systems)

SPDT 

(Single  Pole  Double  Throw)  switches  have  both  N.O.  &  N.C.  configurations  by  using  a  common  pole  along  with  two 

additional poles to achieve this dual capability.

Conversion from N.O. (Normally Open) to N.C. (Normally closed)

1.  Loosen allen set screws (4 - 40) on face of body. These are the set screws holding the reed switch in place.

2.  Move the reed switch downwards until it shows a closed contact on the multi-meter.

3.  Tighten (4 - 40) allen set screws on face of the body.

4.  Cycle until on and off by turning upside down to simulate flow. This may necessitate some refinement of the exact location  

     of the reed switch as determined in step 2.

Precautions during installation

 

1.  Avoid any foreign particles during installation.

2.  Large metallic and/or magnetic fields may affect the principle of operation of these units. if disturbance is detected, 

     magnetic shielding may be necessary  to ensure correct operation of the flow switch. 

3.  During installation of explosion proof versions carefully screw in the conduit connector for the electrical leads piping so  

      as to avoid damaging the reed switch leads  or reed switch capsule which may lead to shorting the switch installation. 6 (Six  

      threads) have been provided for installation.

4.  Electrical ratings etc. have been discussed later in this bulletin. it is advisable to keep within those ratings as excessive 

      power will FRY the switch.

Electrical Protection/Ratings 

The electrical Reed Switch is rated for several million cycles and should rarely require replacement. Most switch failures are 

the result of overloading. DO NOT EXCEED RATED CAPACITY, as this will cook the REED SWITCH, Catalogue ratings are based  

upon D.C. resistive loads, however A.C. loads are also commonly switched.

Inductive load switching- Unless appropriate contact protection is provided with either a diode or R.C. network, inductive  load 

switching will cause the contacts to stick.

Capacitive load switching - The static capacitance in cables may cause permanent or intermitter contact sticking. Contacts may 

be protected by a series surge protector of 0.5 to 5 mAH, depending on the load. in some instances, a 10-500 ohm resistor can 

replace the surge suppressor.

Cleaning

Cleaning the flow switch is easily accomplished without removing from the line. By unscrewing the clean out plug, the 

magnetic piston may be removed and the flow passage flushed or cleaned. Care should be taken to thoroughly clean the 

piston before replacing ( replace the piston as shown in see page 3 figure 2. if  the piston is replaced incorrectly, incorrect 

operation will result).

1.  A magnet may be used to remove the magnetic piston.

2.  PTFE end plugs (on PTFE models) should not be over tightened.

Summary of Contents for M-200X

Page 1: ...malema com M 200X Explosion proof adjustable flow switch with right angle Flow Operating Instructions and Quick Start Guide ...

Page 2: ...tents Introduction 03 Operation 03 Storage and Handling 03 Installation Instruction 03 Construction 03 Specification 05 Certification 06 Dimensional drawings 06 Flow Setting Information 07 Ordering Information 07 Warranty 08 ...

Page 3: ...without condensation Unpacking and Product Inspection On delivery check the product for damage Confirm that the model code on the label matches the specification in the purchase order Installation Instructions This product can be mounted in any orientation Adequate filtration and sealing procedures should be used when mounting in flow lines Operating Environment Choose a location with an ambient t...

Page 4: ...N C Normally closed 1 Loosen allen set screws 4 40 on face of body These are the set screws holding the reed switch in place 2 Move the reed switch downwards until it shows a closed contact on the multi meter 3 Tighten 4 40 allen set screws on face of the body 4 Cycle until on and off by turning upside down to simulate flow This may necessitate some refinement of the exact location of the reed swi...

Page 5: ...y Set point Differential Deadband Repeatability Higher accuracy units available 10 maximum 15 2 maximum Reed Switch Data Electrical Ratings Reed Switch Switching Voltage Breakdown Voltage DC Resistive AC Resistive Switching Current 10 Watts SPST or 3 Watts SPDT Hermetically Sealed UL Recognized File E47258 Operating temperature 40 C to 125 C 200 VDC 170 VDC for SPDT 250 VDC 200 VDC for SPDT 10 VA ...

Page 6: ...tions 2 Certified for ATEX and IECEX directives Details can be found on http www malema com certifications 3 Certified for CE compliance under ATEX 2014 34 EU directive Details can be found on http www malema com certifications Certifications Dimensional drawings Illustrated is the M 200X model with 1 2 ports Port size A B C D E F G 3 8 3 25 1 250 1 00 0 500 1 070 2 75 3 50 1 2 3 25 1 250 1 00 0 5...

Page 7: ...proximity to such interferences or relocate the flow switch away from them appropriately 07 This model is a adjustable flow switch The flow set point is fixed at the factory and is field adjustable Proper calibration of the set point requires the following information When purchasing a flow switch use the Set Point Calibration form on page i vi or provide this information on the purchase order Cal...

Page 8: ... to the buyer Service and Repair To return the products please obtain an RMA number for the product by contacting Malema Sensors Corporate Office Boca Raton at 800 637 6418 or 561 995 0595 All returns of equipment must go to the following address Malema Sensors 1060 S Rogers Circle Boca Raton FL 33487 USA NOTE Specifications are subject to change without notice Warranty 08 2018 Malema Engineering ...

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