Chat with us, powered by LiveChat

SMART ESM – Exhaust Scrubber Washwater Monitor

With the IMO’s 2020 global sulphur cap fast approaching, a popular solution to ensure compliance is to install an exhaust gas cleaning system (EGCS).

For this, wet scrubber systems use wash water to remove the pollutants from the exhaust gas. Therefore the wash water being discharged must be monitored at all times to ensure it is within the limits set by the regulating body. There are IMO regulations for water quality parameters including Polycyclic Aromatic Hydrocarbons (PAHs), pH and turbidity prior to discharge into the ocean.

Rivertrace is an ISO 9001 Quality-Assured Company and market leader in Oil in Water Quality Monitoring, with over 30 years’ experience and your partner to ensure that the wash water discharged from your exhaust gas cleaning systems is compliant with the global regulations on discharge.

Our SMART ESM monitor developed by Rivertrace, is suitable for both the inlet and outlet of a wet exhaust gas cleaning system, measuring and recording PAH, Turbidity, Temperature and pH, on open-loop, closed-loop and hybrid scrubber systems.

The SMART ESM is fully compliant with MEPC 259(68) and provides reliable information to ensure compliance with the worldwide SOx limits.


  • Ensures compliance of wash water discharge from ship EGCS is within regulatory limits
  • Fully compliant with IMO MEPC 259(68)
  • Systems suitable for both new ship and retro fit installations
  • Compatible with Open Loop, Closed Loop and Hybrid systems
  • Suitable for inlet and outlet monitoring


  • PAH Measurement is compensated for turbidity
  • Continuous real-time monitoring of wash water discharge including PAH, turbidity, Temperature and pH
  • On screen historical data graphs showing Instant/ Hourly/ Daily/ Weekly figures
  • Data can be emailed automatically
  • Automatic cleaning of optical path
  • Plug and play maintenance design
  • Easy calibration check kits or component replacement

Optional Components

  • Cooling Enclosure
  • Degasser
  • Printer


Power Supply 100 – 240V AC, 47 – 63 Hz single phase
Dimensions H480mm x W560 x D183
Weight 18.5Kg
Operating pressure Max 4.0 bar
Ambient operating temp 0 – *50 oC *Higher Optional
Sample flow 0.1-4 L/min
PAH range 0 – 4500 μg/L
PAH resolution 1 μg/L
PAH accuracy 1%
Turbidity range 0 – 500 NTU
Turbidity resolution Yes 0.1 up to 100 NTU, 1 thereafter Yes
Turbidity accuracy Yes
pH range 0 – 14
pH resolution 0.1
pH accuracy 0.1
System outputs RS485 Modbus
TCP/IP Ethernet (RJ45)
4x Volt free relay contacts for each parameter measured
4x 4-20 mA output for each parameter measured
SD Card for storing
Display/user interface 10.1” capacitive touchscreen
Sample inlet/outlet 1⁄4” BSPP Female Thread
Monitor configuration Separate calibrated PaH and Turbidity cartridges fitted inside the measuring cell allow the calibrated parts to be swapped without the need of isolating
Enclosure IP65
Regulatory Approvals DNV GL Statement of Compliance (Pending)

Specifications and system descriptions accurate at time of printing. These are subject to change.

Sign up to our newsletter

This website uses ‘cookies’ to give you the best user experience possible and us statistical data about our visitors and how they have used our site. No personal details shared by cookies can identify you. Using this website means you’re happy with this. You can find out more about the cookies we use at our Cookie’s page. To hide and accept this message, click OK.