Resin Sensor

resinsenosrpostThe Resin Sensor is used to count Resin. In most cases, we install the resin sensor onto an exhaust port on the pump. For each “stroke”, the exhaust will push up the inner pellet which triggers a sensor to send a signal to the monitor that displays exactly how much resin is being used. This sensor can also be used for Gelcoat pumps as most times the equipment is similar. We do have a mechanical type sensor that we use on pumps that do not have an outer exhaust.

resinsensorwholeThe white nylon adjustable screw is used for sensitivity on how the inner pellet interacts with the exhaust. Using a magnet, it helps gravity pull the pellet back down after an exhaust blow. Sometimes, adjustment is required. If it is determined that the inner pellet is not coming down, you may have to turn the screw INWARD so the magnet will be closer and able to pull down the pellet. If it is determined that the exhaust is not causing the pellet to move up, you may have to turn the screw OUTWARD so the magnetic pull is lessened and the exhaust will be efficient enough to move the pellet upwards and at the same time, the screw will have sufficient pull to, again, help gravity.

resinsensorpeicesYou can see that the sensor has just a few parts to it. The white nylon screw, the pellet with an internal magnet, and a fitting for installation on an exhaust port. It can be taken apart pretty easily for maintenance and cleaning.


To clean, it is recommended to take a cotton swab and some rubbing alcohol and clean inside the sensor block, freeing any moisture or grit that has accumulated. Moisture and grit particles can impede the smooth movement of the pellet.

Monthly cleaning of the sensor will ensure consistent operation and accurate counting of resin or gelcoat.


In cases where moisture or particles issues are going to be an on going issue, we also have what we call our Mechanical Sensor. We installed this sensor on a moving part of the pump, such as the slave arm.



The moving part that the mechanical sensor is attached too brings the sensor down or next to a magnet, which then sends the signal to the monitor. The monitor counts the usage according to the calibration setting.

The calibration procedure is the same as our regular exhaust sensor used for resin and gelcoat.