Disclaimer: Please note, all information on this page referring to EP, XP, explosion Proof, Factory Mutual, or FM approval are for reference purposes only. Explosion proof products and part numbers for these models are obsolete and no longer available to purchase from Gems.

How to Replace an Explosion Proof Transmitter on a Standard Alloy SureSite


The below information will help explain how to replace an explosion proof transmitter on a Standard Alloy SureSite visual level indicator.  Only proceed to this step if you’ve determined the transmitter is faulty by going through the troubleshooting steps.  One important thing to remember is that the transmitter must be installed adjacent to the flag assembly, on either side.  If it is not within this orientation the reed switches within the transmitter may not close.  See the below image for further detail, in position (a) or (B).




First step is to identify what type of transmitter you have.  Luckily there are only two explosion proof transmitters, and the only difference between them is the location of the junction box.  P/N 84110-XXX (XXX is indicating length in inches) will have the junction box at the bottom.  P/N 812960-XXX will have the junction box at the top of the SureSite.  84110 is the more common configuration.  See the below images detailing both. 




Next step is to measure between the red and blue indicating tapes on your transmitter.  The blue indicates the bottom portion of the indicating level, and the red marks where the indication level stops.  The distance between these two marks in inches will dictate how long we make the transmitter and the complete p/n.  For example, if your measurement is 36”, with the junction box at the bottom, the p/n will be 84110-036.  If your junction box was at the top, your p/n would be 812960-036. ‘X’ shows the indication length below. 


Once you have determined your p/n please contact Gems for pricing and availability. 


After receiving your transmitter, you will clamp it onto the housing and line the indication marks (blue and red) with your flag assembly indication points.  Make sure you follow all the proper guidelines for installing this within a hazardous location.