A washwater monitor measures and reports. The scrubber control system acts. The SMART ESM has no direct control over the scrubber. It reports measured values, and the scrubber manufacturer handles control.
For the scrubber monitoring requirements, see the exhaust scrubber washwater discharge page.
What does each system do?
| System | Role |
|---|---|
| Washwater monitor (SMART ESM) | Measures PAH, turbidity, pH and temperature and reports the values |
| Scrubber control system | Compares discharge with inlet readings and controls the scrubber |
How is data shared?
- 4 to 20 mA output for each parameter.
- MODBUS over RS485.
- Internal SD card storage, which can be downloaded to an external USB.
- On screen graphs showing instant, hourly, daily and weekly history.
Why does response time matter?
The product page gives a response time of 266 seconds at 1 L/min. The scrubber control system should be set up with this delay in mind. Check the current datasheet for your configuration.
| Key point: Agree the signals, scaling and alarm points between the monitor supplier and the scrubber manufacturer before commissioning. |
How does this support compliance records?
Stored data, graphs and downloads give the record that port state control may ask for. See the SMART ESM library page and our compliance records article.
What should be agreed at project stage?
- Which signals the scrubber control system will use.
- Who owns alarm limits and responses.
- Where records are stored and for how long.
Frequently asked questions
Does the SMART ESM control the scrubber?
No. It reports measured values and the scrubber manufacturer handles control.
What outputs does the SMART ESM have?
A 4 to 20 mA output for each parameter and MODBUS over RS485.
How are washwater records stored?
On an internal SD card, which can be downloaded to an external USB, with on screen graphs of historical data.
What is the monitor response time?
The product page gives 266 seconds at 1 L/min.
Which Rivertrace products are relevant?
| Product | Technology and use |
|---|---|
| SMART ESM | Washwater monitor for PAH, turbidity, pH and temperature. Open loop, closed loop and hybrid scrubbers |
| Calibration Check Kits | Used to check the PAH and turbidity readings onboard |