t>

MPC-4 STROKE SENSOR TEST

 

Watermakers with MPC-3000 shipped before Dec 1, 2004 are equipped with stroke sensors.  The stroke sensor, p/n EL-MPC-SC15, is located on the Clark pump in a cavity on the valve body end cap.  It has a small green light that blinks on and off with each pump cycle.  The stroke sensor is used by the MPC controller to calculate the GPH (LPH) PRODUCT display, and for the SYSTEM STALLED alarm.   Inside the stroke sensor are two magnetically actuated switches.   One switch turns the light on and off using power between the red and black wires.  The other switch is between the green signal wire and the black ground wire.  The signal wire has 4.9 volts supplied to it from the Printed Circuit Board.  There is a small magnet inside the Clark pump which moves back and forth with each cycle.  The magnetic switches are alternately open, keeping 4.9 volts on the signal wire, and turning off the light, and closed, turning on the light while dumping the signal voltage to ground and dropping the voltage on the signal wire to zero.

 

If you can hear the Clark pump cycling but the green light is not blinking you can test it as follows:  Remove it from the cavity for testing [use a pocket knife to pry it out].  With the power on to the watermaker, place a magnet next to the back of the sensor and see if the light comes on.  NOTE: the magnet must be polarized properly so try both sides.  If the light goes on and off the sensor may be good.  In this case the problem could be with the magnet in the valve body of the Clark pump.  If the light does not come on, check the wiring and the connections inside the MPC box.  There should be five volts between the red and black wires in the stroke sensor cable.  If there is no power to the sensor the printed circuit board has a fault.  If there is power to the sensor but it won’t blink it could be either the sensor or the wiring that has failed.  Check for broken wires at the sensor.

 

If the light is going on and off with each cycle of the Clark pump but you are getting a SYSTEM STALLED alarm, then the signal that the Clark pump is stroking is not getting through to the controller.  Check the voltage from the green wire to the black wire in the sensor cable connector.  The voltage should cycle between 4.9 volts and 0 volts with each stroke of the Clark pump.  If it stays at 4.9 volts, either the stroke sensor is bad or the green signal wire is broken or has a bad connection.   Carefully check the wiring.  

 

If the voltage stays at zero while the green light is cycling on and off either the stroke sensor is bad, the Printed Circuit Board is not providing power to the signal terminal, or there is a short in the cabling between Signal and ground.  First remove the green signal wire from the connector and check for voltage.  If the voltage comes up to 4.9V the sensor is bad or there is a short in the wiring. 

 

 If the voltage at the connector stays at zero with the signal wire disconnected, it is a PCB problem.  Try moving the wires to the other set of stroke sensor terminals in the connector.   If that doesn’t work replace the PCB. 

 


05/12/06 

Stroke Sensor with Cable (1.5')

Part no: SW-EL-MPC-SC15

Only found on older models which were shipped with MPC3000 before 1 December 2004 – 

 

 

Write a review

Note: HTML is not translated!
    Bad           Good
Captcha

Spectra - Stroke Sensor with Cable (1.5')

  • $76.50


Related Products

Spectra - Z+Ion System Protection

Spectra - Z+Ion System Protection

The Z±ION Protection System floods your watermaker wi..

Options

Spectra - Salinity Probe

Spectra - Salinity Probe

The salinity probe on MPC systems tests the salinity of the ..

Options

Spectra - Oil/ water Separator Filter Element

Spectra - Oil/ water Separator Filter Element

This filter element is a replacement for the oil/water separ..

$360.00

Katadyn/Spectra - Pre Filter Elements 5 Micron

Katadyn/Spectra - Pre Filter Elements 5 Micron

Replacement 5 micron Pre-filter elements for the Katadyn/Spe..

$28.95

Katadyn/Spectra - Pre Filter Elements 20 Micron

Katadyn/Spectra - Pre Filter Elements 20 Micron

Replacement 20 micron Pre-filter elements for the Katadyn/Sp..

$28.95

Katadyn/Spectra - Pre Filter Elements 50 Micron

Katadyn/Spectra - Pre Filter Elements 50 Micron

Replacement 50 micron Pre-filter elements for the Katadyn/Sp..

$28.95

Katadyn/Spectra - Pre Filter Elements Carbon 5 Micron

Katadyn/Spectra - Pre Filter Elements Carbon 5 Micron

Replacement 5 micron Carbon Pre-filter elements for the Kata..

$39.95

Spectra - SC1 Cleaning and Storage Chemical

Spectra - SC1 Cleaning and Storage Chemical

SC1 - Storage Chemical  Spectra’s unique formu..

$50.23

Spectra - SC2 Alkaline Cleaning Chemical

Spectra - SC2 Alkaline Cleaning Chemical

SC2 - Alkaline Cleaning Chemical  Spectra’s un..

$50.23

Spectra - SC3 Acid Cleaning Chemical

Spectra - SC3 Acid Cleaning Chemical

SC3 - Acid Cleaning Chemical  Spectra’s unique f..

$50.23

Spectra - Sea Strainer Complete 6 Inch

Spectra - Sea Strainer Complete 6 Inch

All your Sea Strainer needs from -  Complete repl..

$167.50

Spectra - Sea Strainer Complete - 5 Inch

Spectra - Sea Strainer Complete - 5 Inch

All your Sea Strainer needs from -  Complete repl..

$104.95

Spectra - Sea Strainer Screen only  - 5 Inch

Spectra - Sea Strainer Screen only - 5 Inch

All your Sea Strainer needs from -  Complete repl..

$41.95

Spectra - Sea Strainer Screen only 6 Inch

Spectra - Sea Strainer Screen only 6 Inch

All your Sea Strainer needs from -  Complete repl..

$41.95

Spectra - Clark Pump 7% & 10% Seal and O Ring Kit

Spectra - Clark Pump 7% & 10% Seal and O Ring Kit

While the Clark Pump is designed to run for many thousands o..

$360.00

Spectra - Clark Pump 15% & 20% Seal and O Ring Kit

Spectra - Clark Pump 15% & 20% Seal and O Ring Kit

While the Clark Pump is designed to run for many thousands o..

$596.50

Katadyn/Spectra - High Pressure Filter Housing - Black

Katadyn/Spectra - High Pressure Filter Housing - Black

High Pressure Filter Housing for the Katadyn/Spectra waterma..

$186.25

Katadyn/Spectra - Low Pressure Filter Housing - Black

Katadyn/Spectra - Low Pressure Filter Housing - Black

Low Pressure Filter Housing for the Katadyn/Spectra watermak..

$182.10

Katadyn/Spectra - 10 Inch Big Clear Filter Housing

Katadyn/Spectra - 10 Inch Big Clear Filter Housing

10 Inch Big Clear Filter Housing for the Katadyn/Spectra wat..

$370.45

Katadyn/Spectra -  3 Piece Low Pressure Filter Housing - Blue

Katadyn/Spectra - 3 Piece Low Pressure Filter Housing - Blue

3 Piece Low Pressure Filter Housing for the Katadyn/Spectra ..

$100.45

Katadyn/Spectra - Accumulator Tank

Katadyn/Spectra - Accumulator Tank

Accumulator Tank for Spectra watermaker units. Part ..

$188.35

Katadyn/Spectra - Flow Meter 10 GPH

Katadyn/Spectra - Flow Meter 10 GPH

Flow Meter (10GPH) for Spectra watermaker units. Part no ..

$265.85

Katadyn/Spectra - Flow Meter 20 GPH

Katadyn/Spectra - Flow Meter 20 GPH

Flow Meter (20GPH) for Spectra watermaker units. Part no ..

$265.85

Katadyn/Spectra - Hi Pressure Filter Housing O-Ring

Katadyn/Spectra - Hi Pressure Filter Housing O-Ring

Hi Pressure Filter Housing O-Ring for the Katadyn/Spectra wa..

$6.40

Katadyn/Spectra - 3 Piece Filter Housing O-Ring

Katadyn/Spectra - 3 Piece Filter Housing O-Ring

O-Ring for the Katadyn/Spectra watermaker units - 3 Pie..

$4.27

Katadyn/Spectra - Filter Housing Seal

Katadyn/Spectra - Filter Housing Seal

Filter Housing Seal for the Katadyn/Spectra watermaker units..

$4.27

Katadyn/Spectra -3 Pcs Big Blue Filter Housing O-Ring

Katadyn/Spectra -3 Pcs Big Blue Filter Housing O-Ring

Big Blue Filter Housing O-Ring (3Pcs) for the Katadyn/Spectr..

$36.29

Tags: spectra, watermaker, mag, vane, pump, feed, kit, catalina, newport, 300, 340z, 400, 700, 1000