NMEA 2000 Engine Monitoring

[Fuss]

Thanks, you could be right that taking inputs off the original signals but, thinking about this, I’m not sure this is right…for example.
If you run multiple analog instruments off one sensor, then both instruments read wrong, you have to change the sensor to one for two instruments. I am not sure the nmea2000 will affect analog instruments the same as adding a 2nd analog instrument.
I hope I wrote this clearly enough…does anyone have experience of what the original gauges read when a nmea2000 converter box is connected to the same wires?

[SV-Apres]

Originally Posted by Fuss

Thanks, you could be right that taking inputs off the original signals but, thinking about this, I’m not sure this is right…for example.
If you run multiple analog instruments off one sensor, then both instruments read wrong, you have to change the sensor to one for two instruments. I am not sure the nmea2000 will affect analog instruments the same as adding a 2nd analog instrument.
I hope I wrote this clearly enough…does anyone have experience of what the original gauges read when a nmea2000 converter box is connected to the same wires?

lets take a temp or oil pressure sensor as an example, it is just a resistor that changes resistance with temp or pressure.

in the analogue system:
BatV ------ GaugeR ----- sensorR --- (ground through engine)

the gauge is a coil with a fixed resistance, the sensor is a variable resistance.

in the CX5003, I expect it is a voltage divider circuit as shown below:
SensorSupplyV -------R1--------SensorR -----(ground through engine)

The voltage is sensed between the fixed resistor (R1) and SensorR and this voltage is used to assess Pressure or Temp.

I did not test the SensorSupplyV but this may not be battery voltage, it may be 5v or 3.3V - this would be problematic if you connected the analogue system to the CX50003 system.

also, if they were the same voltage you would have resistors in parallel like below:
BatV -------------- GaugeR ----- sensorR --- (ground through engine)
SensorSupplyV -------R1---/

So if the were connected together at the sensor connections then there would be 2 Resistors in parallel and the and both numbers would be wrong. however, if you are concerned with changes in reading vs absolute, this may be acceptable - you would have to do the math to establish if the additional resistor reduces your ability to sense in part of the range you need to sense

[Sam Pam]

I bought one of these CX5003 units but if I hook it up to 12V and my nmea network I don't see it show up on my B&G Zeus 3s. Is my unit somehow broken or am I missing something? To be fair I didn't hook up any sensors yet, but I would expect the device at least to show up with empty (or full) tankreading depending on the configuration. Is there a way to test if the device is working? Anything special on the Zeus 3 that would prevent this device from showing up ?

[Captain Bill]

I use the RS11 from NoLand. The only issue I had setting it up was the oil pressure seemed to be all over the place. The problem was the electronic channel in the device has no inertia unlike an analog gauge. Since oil pumps are lobed pumps they produce pressure in pulses. In an analog gauge the inertia of the mechanism effectively averages the pressure. I added a capacitor across the wires from the sensor to get the same effect. The standard Yanmar harness actually comes with the wires for the oil and temperature gauges built in even if you only have idiot lights on the panel. The engines also have plugs that you can put analog sensors in. Idiot light only switches are provided, but if your engine did not come with an analog panel you will have to add oil pressure and temperature sensors. FYI the ports for these sensors are threaded for PT so US based NPT sensors won't work for anyone in the US. The only channel I had to tap a gauge for was the tach. On my yanmar the sensor counts pulses based on the teeth on the flywheel. One has to know how many teeth are on the flywheel to get an accurate RPM reading.

[Sam Pam]

It seems like the RS11 from NoLand should pretty much do the same job as my CX5003. With what kind of plotter are you using to display the data? My issue is that just nothing seems to be showing up on my B&G Zeus 3s (I have two on the network). I already installed the sensors on my Yanmar. To your point, the standard wiring harness comes with the wires. The standard Yanmar B20 panel can also display the sensor readings on the digital display, but I would rather have them on plotter

[Captain Bill]

Originally Posted by Sam Pam

It seems like the RS11 from NoLand should pretty much do the same job as my CX5003. With what kind of plotter are you using to display the data? My issue is that just nothing seems to be showing up on my B&G Zeus 3s (I have two on the network). I already installed the sensors on my Yanmar. To your point, the standard wiring harness comes with the wires. The standard Yanmar B20 panel can also display the sensor readings on the digital display, but I would rather have them on plotter

I have a Raymarine c95. I have a friend that hooked one up to two older Honda 150s and he has a a Simrad, though I'm not sure what model.

[Dockhead]

That Matsutec unit looks very interesting. Here in the UK it costs £73.


I presume that it can be connected in parallel with the standard Yanmar instruments? Like my defunct Maretron one can?

[Tugwit]

I just installed a Single Engine Gateway from Across Ocean Systems (AOS) in (North) Vancouver, BC. See https://acrossoceansystems.com/ .

Early days still, but it works in parallel with my VDO Viewline gauges (Tach, Oil Pressure, Coolant Temp). Easy to configure as it has a built-in Wi-fi radio and web server feature. AOS also has an EGT sender that I'm anxious to try...if only my MFD supported PGN 130316 Temp-Extended Range (sigh).

Panbo featured the company a couple of years ago and seemed pleased:
https://panbo.com/across-ocean-syste...ement-options/

[nwn]

I have tried to install an AlbaCombi to monitor my Yanmar engine. Unfortunately, it creates interference with AIS that provides the GPS signal for my NMEA2000 network. First, I tried monitoring the PPM and when that created GPS fix lost on my Axioms, I tried with only temperature monitoring. The AlbaCombi was mounted close to the AIS transceiver, about 30 cm. Is this a wellknown problem that somebody has an opinion about?

[Schuedog]

Hello, I have two diesel Volvo MD2020 that I am installing magnetic tachometer pickup into. They have 88 teeth on the flywheel.

I bought a CX5003 to connect these to and convert it over onto the NMEA 2000 and my Garmin GPSMAP 743XSV.

I cannot find what the switch settings need to be for the speed ratio of 88.

Can anyone help before I send this all back?