Capacitive Sensor addon
Capacitive Sensor addon
(OP)
I have a control arm, and there is some metal block wired in series with my capacitive sensor, and I am not sure what it is or what it does.
Anyone seen this before and can give me some intormaion?





RE: Capacitive Sensor addon
- Reference capacitor at ambient temp to control for temp at sensor
- Some sort of proximity switch
Are you sure it is in series?
RE: Capacitive Sensor addon
It is definitely in series - no doubt there.
It may be a solenoid proximity switch, if so not like any I have ever seen.
The application is above an ink tank, the sensor(s) see a high/low level and fill the ink tank back up.
The valve opens up to fill the tank at 50mm from the sensor, and stops filling at 20mm from the sensor.
This makes me think it must be 2 sensor operating here, since a capacitive wouldn't get 50mm distance unless it was far bigger.
RE: Capacitive Sensor addon
Could it be an overflow cutoff switch in case of main sensor error? If this is the case it could be magnetic, thermal, ultrasonic, conductive, etc depending on the properties of your ink. You could test it by submerging it in ink and seeing if anything happens.
RE: Capacitive Sensor addon
There are no openings or windows in the block.
This was sent to us by a client, who also does not know what it is, just that it no longer works. I don't have access to the factory, if I did this would be much much easier.
The parameters I was given is that it activates (fills the tank) at 50mm from the sensor(s), and de-activates (stops filling) at 20mm from the sensors.
The arm sits above the tanks.
My first thought was why not have one sensor inside the tank, but this does not work because it is used on different inks, colors, etc.
A capacitive sensor has only 2 states, on or off, so this other little block must be a sensor of some sort - just no idea what.
The capacitive would do the 20mm "top" end of the open tank, so this other sensor would do the lower end, 50mm sensing distance.
I don't think it would be magnetic or thermal. Ultrasonic is a possibility, the sensing distance works, but I don't see how such a closed box could be ultrasonic.
RE: Capacitive Sensor addon
Alternatively, one is an infrared light source and the other is a receiver.
Keith Cress
kcress - http://www.flaminsystems.com
RE: Capacitive Sensor addon
Is it good enough to replicate the function or has your customer asked you to duplicate the setup?
RE: Capacitive Sensor addon
Keith Cress
kcress - http://www.flaminsystems.com
RE: Capacitive Sensor addon
RE: Capacitive Sensor addon
RE: Capacitive Sensor addon
There are 2 cores in the cable connected to it.
It is magnetic, but oddly only on the sides, not on the front end which I would have thought.