The X2 utilizes NexSens’ proprietary Under Water 8-Pin (UW8) connector for all sensor connections. This easy to use thread-in connector is fully submersible and offers an easy connect/disconnect option for the three unique sensor ports available on the X2 (P0, P1, & P2). Each port offers a unique RS-232 channel, a separate switch power channel, as well as a shared RS-485 and SDI-12 bus.

When more than one sensor is to be connected to a single port (either through a passthrough sensor like the T-Node FR, a UW splitter, or when multiple are made available on the X2-CB plate) some attention must be paid to which sensors are connected to which ports. All three ports operate exactly the same and are interchangeable. However, it is crucial to take into consideration sensor warmup and sample times. Since all sensors on a single port will be powered together, sensors with similar time requirements should be paired together.

Another important factor to consider is the power demand of the sensors. If there is a sensor with a high power demand it is best to place it on its own port so that it can be on for the shortest time possible. Additionally, some sensors require full-time power to operate correctly. It is typically recommended to place these on their own port so other sensors are not powered constantly when it is not required.

Finally, keep in mind that certain sensors must be placed on separate ports regardless of other considerations. Two different RS-232 sensors can never share a port as the communication signals will interfere and the sensors will not respond correctly. Please see the Sensor Communication Protocols article for more details.

Example of Sensor On-Time Optimization

Example Equipment

  • Sensor 1: Warmup time = 60 sec.; Sample time = 5 sec.
  • Sensor 2: Warmup time = 5 sec.; Sample time = 120 sec.
  • Sensor 3: Warmup time = 10 sec.; Sample time = 30 sec.
  • Sensor 4: Warmup time = 1 sec.; Sample time = 240 sec.

Solution 1

Connections

  • P0: Sensor 1 & Sensor 4
  • P1: Sensor 2
  • P2: Sensor 3

Total On Time

  • P0: 60 sec. warmup for Sensor 1 + 240 sec. sample time for Sensor 4 = 300 sec. of on time
  • P1: 5 sec. warmup for Sensor 2 + 120 sec. sample time for Sensor 2 = 125 sec. of on time
  • P2: 10 sec. warmup for Sensor 3 + 30 sec. sample time for Sensor 3 = 40 sec. of on time
  • Total Device On Time = Max of any port = 300 seconds

Solution 2

Connections

  • P0: Sensor 1
  • P1: Sensor 2 & Sensor 4
  • P2: Sensor 3

Total On Time

  • P0: 60 sec. warmup for Sensor 1 + 5 sec. sample time for Sensor 1 = 65 sec. of on time
  • P1: 5 sec. warmup for Sensor 2 + 240 sec. sample time for Sensor 4 = 245 sec. of on time
  • P2: 10 sec. warmup for Sensor 3 + 30 sec. sample time for Sensor 3 = 40 sec. of on time
  • Total Device On Time = Max of any port = 245 seconds

Comparison

Here you can see that Solution 2 better matches the warmup and sample times of sensors 2 and 4 to reduce the total device active time by 55 seconds. That is an 18% reduction in sample time and this reduction will lead to less power consumption by the system as a whole.