Storage Battery Systems Inc. has developed the HGDI hydrogen gas detector so that every flooded plant installation can conform to the "best practice" of thorough gas monitoring, detection & alarming. The HGDI is available in dual relay models & provides a warning signal at 1% H2S concentration and an alarm at 2% concentration. The acid-proof housing is bright green so that inspectors can easily identfy it from the ground level. An optional remote status display is offered so that testing can be accomplished at floor level as well. The HGDI is a remarkably inexpensive way to provide reliable, 27/7 gas detection to protect your facility & equipment from hydrogen explosion. Its affordability allows you to place multiple units throughout your exposed areas. Every wet cell storage battery produces hydrogen gas emissions during charge & discharge cycles making hydrogen gas detection & alarming essential. Now there is absolutely no reason not to deploy a hydrogen sensor.