In indoor swimming pools, chlorine and in some facilities ozone may be used for water disinfection. Leaks that may occur in gas dosing and generator rooms represent a risk that must be monitored continuously in terms of maintenance personnel, visitors, and facility operations. The source CETCI application describes facilities using chlorine alone and facilities using chlorine + ozone with separate architectures.
In the source architecture, the chlorine dosing room and ozone generator room are treated as separate sensor and alarm points.
Continuous Monitoring in Chlorine Dosing Room
According to the source document, chlorine is a common chemical in pool water disinfection. In the chlorine dosing and storage room, the LPT-A-CL₂ transmitter is used for continuous leak monitoring. The DCC or QCC controller is located outside the room, preferably adjacent to a viewing window, providing pre-entry level verification.
Chlorine Sensor Mounting Height
As chlorine is heavier than air, the source application recommends mounting the LPT-A-CL₂ transmitter approximately 6 inches above floor level, close to the potential leak source but away from the direct influence of the ventilation fan.
Monitoring the Ozone Generator Room
In facilities using ozone, an LPT-A-O₃ transmitter is additionally positioned in the ozone generator room to monitor potential leak points around the generator and destructor. The source document notes that although ozone in pure form is slightly heavier than air, it should not necessarily be assumed to settle on the floor.
5-Metre Distance Criterion
According to the source document, if additional reaction tank or destructor equipment is located farther than 16 ft (approximately 5 m) from the existing sensor, an additional sensor may be required. This value is a manufacturer application example and must be evaluated alongside actual project airflow and room layout.
Portable Chlorine Monitor During Maintenance
It is stated that the likelihood of leaks increases during routine maintenance activities such as chlorine cylinder/drum changeovers. Alongside the fixed system, the source recommends that maintenance personnel use a portable chlorine gas monitor as an additional layer of safety.
Comparison of Chlorine and Ozone Systems
| Scenario | Controller | Sensors | Key layout |
|---|---|---|---|
| Chlorine only | DCC | LPT-A-CL₂ | Chlorine room close to floor |
| Chlorine + ozone | QCC | LPT-A-CL₂ + LPT-A-O₃ | Two separate gas rooms / source points |
| Second entrance | QCC-RDM | — | Remote display prior to entry |
| Maintenance work | Portable instrument | Cl₂ sensor | On the worker / in the work area |
Which Chlorine / Ozone Gas Detector Should Be Selected for Indoor Pools?
NOVEL's CETCI LPT series product page includes chlorine (Cl₂) and ozone (O₃) sensor options. Due to their sticky/reactive nature, these gases require special consideration regarding sensor accessories and mounting details. In swimming pool projects, the chlorine room, ozone generator, remote alarm, and ventilation scenario must be engineered separately. Review Chlorine and Ozone Detectors.
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Frequently Asked Questions
Is the chlorine gas detector installed in the pool area or in the chlorine room?
In the source system, the primary Cl₂ transmitter is located in the chlorine dosing/storage room where the potential leak source is situated.
Why is the chlorine sensor mounted close to the floor?
Chlorine is heavier than air; the source application positions the sensor at approximately 6 inches floor height.
Where should the ozone sensor be located?
The source document positions the ozone transmitter in the generator room relative to potential leak points around the generator and destructor.
Can chlorine and ozone be connected to the same controller?
In the source QCC architecture, chlorine and ozone transmitters can be monitored on the same multi-channel controller.
Is a portable instrument required during chlorine cylinder changeovers?
The source document recommends a portable chlorine monitor as an additional layer of safety during maintenance and cylinder changeover.
Can the alarm operate the ventilation automatically?
According to the source system, relays can be configured to trigger ventilation or emergency exhaust functions depending on local codes and scenarios.
Reference and Technical Note
The application architecture and model-specific technical details in this article have been compiled from an application document provided by Critical Environment Technologies Canada Inc. . As source materials may be superseded, current product codes, certificates, measuring ranges, and local regulations must be independently verified prior to project design or procurement.
Author: NOVEL Technical Team
Publication date: 7 September 2026