The cement industry will soon be under new regulations, as the EPA has recently announced amendments to the industry’s current regulation codes. The amendments will require stricter mercury emissions control, as well as reduction in other emission. These changes come after studies showing that Portland cement manufacturers are the third largest producer of mercury air emissions in the United States. Existing facilities will have to be in compliance within three years, while new plants must be in compliance prior to operating. Due to this change, many facilities are currently seeking emissions monitoring systems in order to achieve compliance. Some facilities have already begun to look into mercury sorbent traps, due to claims that it is the best solution for mercury monitoring. However, closer investigation proves this to be severely short sighted, as detailed below.

  • Continuous Emissions Monitoring Systems (CEMS), such as the Cemtrex SM-4, provide continuous readings and reporting as compared to the batch and periodical readings by sorbent traps. For certain applications sorbent traps may take several days to a few weeks before any analysis can be done.
  • For highly fluctuating concentration levels, typically 500ug/m3, sorbent traps can become saturated within hours requiring frequent visits to pull the traps. The Cemtrex SM-4 monitor comes with Auto Sample Volume (ASV) technology, a unique feature unavailable on any other system in the market, which switches the ranges as required. The systems are also capable of speciated Hg readings (Hg0 and Hg2), as required by the EPA.
  • Large variations in mercury concentrations in raw mill conditions may require up to 20 different sorbent trap systems, requiring the facility to have an unnecessarily high level of inventory to ensure compliance. The SM-4 can handle these large fluctuations in concentration without additional systems and parts.
  • The fragile glass sorbent traps can be easily broken, which would require a new batch testing in order for analysis to be completed. This will lead to significant fines due to non-compliance. Cemtrex mercury monitors are designed to be rugged and last for many years to avoid EPA non compliance fines.
  • Frequent visits to stack location for pulling the traps will lead to significant increase in labor and training costs. The overall costs of a CEMS system are much lower than that of a sorbent trap system.
  • The Cemtrex Hg CEMS, such as the state of the art SM-4, does not require any shelter or Argon gas for operation, which leads to savings in comparison to other mercury monitors on the market.
  • Cemtrex Hg CEMS are field mountable and can be mounted close to probe (within 5 feet), as the rack comes with a temperature controlled enclosure.

In comparison to sorbent traps, as well as other mercury monitors on the market, Cemtrex mercury monitors are much more advanced, reliable and cost effective. The overall savings from the SM-4 over any sorbent trap system alone is an indicator of the advantage of utilizing Cemtrex mercury monitors. This, along with the system’s technological advantages over other competitors, makes Cemtrex the best choice for any mercury monitoring need.

Cemtrex SM-4 Mercury Sorbent Traps
Provides continuous monitoring YES NO
Requires constant maintenance
and supervision
Requires multiple different units
for monitoring fluctuating
levels of mercury
Rugged design to minimize
facility downtime/non-compliance


Cemtrex SM-4

All of Cemtrex's Mercury Monitors