Simple, Reliable,
Low Maintenance
TRO Measurement
TRO sensors are now a critical part of the maritime industry. A malfunction can bring shipping operations to a halt. Halogen's TRO sensor measures chlorine from 0.03 to 20 ppm in all types of water — regardless of flow rate, salinity, or turbidity — with no reagents and no complex plumbing.
By the Numbers
Dramatically Simpler Installation
Halogen's patented Direct Pipe Insertion (DPI) design eliminates the extra components required by conventional online DPD systems — reducing installation cost, footprint, and ongoing maintenance significantly.
Halogen DPI Installation
- check_circleNo sampling pumps
- check_circleNo additional automatic valves
- check_circleNo sampling lines
- check_circleNo waste lines
- check_circleNo skid mounting
- check_circleDirect pipe insertion
Typical DPD Installation
- cancelSampling pumps required
- cancelMultiple automatic valves
- cancelLong sampling lines (100m+)
- cancelWaste lines and drain connections
- cancelSkid mounting and floor space
- cancelPressure regulators and Y-strainers
HSI vs. DPD — Cost & Labor Savings
| Feature | Halogen (HSI) | DPD System |
|---|---|---|
| No Reagents | check_circleYes | cancelNo |
| No Waste Stream | check_circleYes | cancelNo |
| Unaffected by Very Turbid Water | check_circleYes | cancelNo |
| No Sampling Lines or Pump | check_circleYes | cancelNo |
| Calibration Interval | 6–12 Months | 1 Month |
| Time to Measurement (PLC) | 45 sec | 180 sec |
| Maintenance Interval | 24 Months | 1 Month |
Advantages for Shipowners & Operators
Halogen sensors are designed for simplicity, longevity, and easy maintenance — reducing the total cost of ownership for BWMS operators significantly compared to reagent-based systems.
Proprietary Technology
Simple, reliable operation from a robust marine device. Five patented technologies work together to make the Halogen TRO sensor the most capable and lowest-maintenance BWMS sensor available.
HiRes TRO™
Patented impeller system enables Direct Pipe Insertion into the ballast pipe, eliminating sampling pumps, automatic valves, sampling lines, waste lines, and skid mounting. Unaffected by flow from 0 to 4 m/s — the only direct pipe insertion TRO sensor that accurately measures TRO under varying flow rates. Magnetically coupled pump motor rated for 20,000-hour life.
SensiCLENE™
Patented self-cleaning system using polymer beads that circulate within the sensor shroud and continuously clean the electrodes. Removes salt and organic buildup within minutes of startup. No filters to clean. Accuracy is not affected by turbidity in muddy ports.
DryGLAS™
Unique pH cartridge that quickly stabilizes after drying out. The only pH sensor on the market that survives both high and negative pressures within a ballast pipe — ensuring reliable operation when the pipe is emptied. Sensor stabilizes within minutes after extended dry periods.
HaloSAL™
Automatic salinity compensation technology. The sensor compensates for signal changes based on water conductivity — whether fully marine seawater or freshwater (0.2 PSU salinity). No other TRO sensor on the market can compensate for changes in salinity.
Rapid Response ORP™
For BWMS systems that use ORP measurement. Traditional ORP probes suffer damage if left dry. The Halogen Rapid Response ORP sensor will never be poisoned or damaged if allowed to dry out — a significant advantage in ballast water applications where pipes are regularly emptied.
Sensor Specifications
| Measurement | Range & Accuracy |
|---|---|
| Chlorine (TRO) | 0.03 – 20 ppm (±15% or 0.06 ppm, whichever is greater) |
| Chlorine Limit of Detection (LOD) | 0.0 – 0.25 ppm |
| Oxidation Reduction Potential (ORP) | −1,100 to +1,100 mV |
| Conductivity / Salinity | 200 – 50,000 µS |
| pH | 5 – 12 |
| Temperature | 0 – 100 °C |
| Cycle Time | 45–55 seconds |
| Communication | Modbus RTU |
Available Models
Three installation configurations available — in-pipe/flange, side stream chamber, and hot tap for live pipe insertion — in both standard (non-hazardous) and IECEx-certified hazardous area variants.
Non-Hazardous
In Pipe / Flange
Sensor for flange or direct pipe installation
Side Stream
Sensor with side stream chamber
Hot Tap
Sensor with hot tap valve for live pipe insertion
Hazardous — Zone 1 Group IIC
IECEx marking: Ex db ib IIC T5 Gb
In Pipe / Flange
IECEx sensor for flange or pipe installation
Side Stream
IECEx sensor with side stream chamber
Hot Tap
IECEx sensor with hot tap valve for direct pipe insertion
Optional Display / Transmitter Units (Non-Hazardous)
2× 4-20 mA outputs · 24 VDC · Modbus RTU
4× 4-20 mA outputs · 24 VDC · Modbus RTU
About Halogen Systems
Halogen Systems Inc. (HSI) develops and manufactures innovative sensors for water treatment. Halogen sensors are rugged, robust, and accurate — covered by more than eleven patents worldwide. Halogen Systems is based near Reno, Nevada, USA and has been making sensors since 2013.
More than 2,000 TRO sensors have been delivered for ballast water management systems worldwide. Sensors are certified by DNV-GL, Korean Register (KR), and IECEx for hazardous area installations.
Ready to specify a TRO sensor for your BWMS?
Our team can help with model selection, installation planning, and certifications.