Membrane/Bag Rupture relay and MBR sensor

Figure 1 - Membrane/Bag Rupture relay and MBR sensor 

Figure 2 - Connection diagram

Figure 3 - Device tag 

Figure 4 - Passage Box - CP-MBR 

CP-MBR Pre-installation

CP-MBR is signal passage box, which has as main focus provide a safe communication between the MBR sensor inside the expansion/conservator tank and the MBR relay. Before turning off the transformer to proceede with MBR installation, the following steps must be done to avoid sudden issues:

1. Consult the technical drawing and, if it is possible, see expansion tank tabulation pictures and access points.

2. If you do not have access to the information above, is necessary de-energize the transformer with the only goal to take expansion tank measures and study the CP-MBR proper instillation point.

With all needed information in hands, a proper CP-BR installation point can be defined, for this purpose, the orientations below must be taken in count to decide the best installation point.

1 - Connected directly in the expansion tank access point

Connect the CP-MBR right in the expansion tank access point (1) or in a “T” shape point (2) very close. In this case any adapter is required. 

2 - Connected in an access point in “T“ shape at the expansion tank arrival tube.

Using an “T“ shape access, connect CP-MBR to any point (excluding the turnings) of the bag arrival tube.

3 - Connected to the expansion tank access point with thread adapter

Connect CP-MBR right in the expansion tank access point or in a “T” shape point very close, by using an adapter to fit in a BSP 3/4” thread.

4 - Hole in the expansion tank

With a drill, do a BSP 3/4” hole in the expansion tank to connect CP-MBR. 

5 - Specific component fabrication specially to the installation

The expansion tank arrival tube has some parts usually called as “turnings”. To install CP-MBR in these points, is hardly recommended on demand  fabrication of an “T” shape access.

The following procedure describes step by step the CP-MBR pre-installation: 

CP-MBR installation procedure

To proceed with CP-MBR installation, just follow the steps below:

1. Find an access point to the expansion tank interior. Normally valves and pre-existing holes can be found on the expansion/conservator tank. If using these points is not an option will be necessary to create an threaded hole. To do so, utilize a drill and a male thread. The standard thread used by CP-MBR is BSP 3/4” the threaded hole must provide to the expansion bag inside or  the oil separation dry surface.

2. Insert the MBR probe through the BSP 3/4” being necessary to leave a little amount of cable inside the conservator to make sure that the sensor will keep in the right position independent of the oil level, therefor is recommended that the cable exceeds the expansion tank in 1m (D + 1m).

3. Screw the base circled below and, then, insert the MBR probe cable through the base, going through the sealing rubber and, at last, the lock washer. Leave around 50 cm of exceedent cable above the base.

4. Lead the cable inside CP-MBR head, making sure to pass through the support PCI, then screw it tightly and also screw the bases safety screw.

5. Strip around 4 mm of both 4 cables. Then, proceed with the electric connections following the diagram below. The CP-MBR connections terminals are hole spring conductor terminals, it means that, is only necessary to plug the conductive edge in each terminal. Therefor, using needle terminals is completely optional;

6. Arrange the cables such as the figure below and verify if all of them are well connected to the hole spring conductor terminals. At last, close the top cover and screw tightly the output cable gland.

Figure 11 - Cables connected to the hole spring conductor terminal 

Basic test procedures

Test 1: MBR relay test with sensor disconnected

With jumpers installed in the correct positions, the table below, shows the connections which must be done in MBR relay and also the expected results.

Test 2: MBR relay test with sensor connected

1. Connect the sensor right in MBR relay (in this test, there is no need to to connect the sensor in CP-MBR);

2. Turn on MBR relay power;

3. Separate a bowl with clean water or oil (a glass may be enough);

4. With the sensor in the air, check MBR LED status (the red LED must be off) and the alarm contact must be as indicated in the following table;

5. Put the sensor in the bowl containing water or oil, the alarm must be activated (on);

6. The alarm contact must behave according to the jumpers listed in the table below.

Test results

1. If MBR relay pass the first test, the relay is normally working;

2. If MBR relay connected with the sensor pass the second test, both relay and sensor are normally working;

3. If MBR relay pass the first test, but reprove in the second one, the sensor is flawed.

Additional MBR relay voltage field tests

1 - MBR relay with all sensors cables connected:

2 - MBR relay with black wire poorly connected to MBR sensor (attached to terminal 14): 

3 - MBR relay with white wire poorly connected to MBR sensor (attached to terminal 6) 

4 - MBR relay with blue wire poorly connected to MBR sensor (attached to terminal 7) 

5 - MBR relay with red wire poorly connected to MBR sensor (attached to terminal 8) 

6 - MBR relay with all cables disconnected:

Tests with MBR sensor disconnected from MBR relay

Test 1: Continuity test between blue and black wires:

With all sensors cables disconnected using a multimeter with continuity test function on, connect the multimeter test leads to both blue and black sensor wires. The multimeter must confirm that truly there is continuity between both cables. Otherwise, the device must be replaced.

Test 2a: Sensor integrity test - part 1:

1. Keep the red and blue cables connected to MBR relay (check if there is around 12 Vcc voltage between them);

2. With a multimeter, measure the sensor output voltage between the white (+) and black (-) wires;

3. With the sensor untriggered, in other words, without any contact to liquids (surround only by air), the output voltage must be 12 Vcc;

4. With the sensor triggered; in other words, in contact with liquids, must have no output voltage, 0Vcc. Otherwise, if the sensor is not having any contact with any liquid and with no output voltage, the sensor is damaged.

If the voltage is close to 0 but does not reach it, follow the next test:

Test 2b: Sensor integrity test - part 2:

1. Disconnect all of MBR sensor cables;

2. Measure with a multimeter in diode measurement mode, the cables white (+) and black (-), as presented in the figure below;

Figure 12 - Measuring the sensor cables

3. If the measuring is around 0 V, the sensor is damaged and must be replaced;

4. If the voltage is higher than 0 V or if the multimeter shows Overload (OL), the alarm probably is real and must program a transformer desconexion and verify its maintenance.

If you have any problems or difficulties with the procedure, please do not hesitate to contact us!

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