Laser gas analysis
Fields of application
Gas- analysers s for ship scrubbers measure the concentration of pollutant gases in ship exhaust gases.
Benefits
The ZQS (analyser ) laser gas analyzer continuously monitors the concentrations of SO₂ and CO₂ in the exhaust gases emitted by a marine engine and subsequently treated by an SOx scrubber. The ZQS complies with Scheme B of Resolution MEPC 259(68), the 2015 guidelines for exhaust gas cleaning systems, adopted by the Marine Environment Protection Committee (MEPC), a body of the International Maritime Organization (IMO).
| Components and ranges | SO₂: 0 to 300 ppm CO₂ : 0 to 10 %vol | ||||||||||||||||||||||||||||||||||
| Principle | TDL (Tunable Diode Laser) for SO2 QCL (Quantum Cascade Laser) method for CO2 | ||||||||||||||||||||||||||||||||||
| Measurement method | Extractive method | ||||||||||||||||||||||||||||||||||
| Application | Exhaust fumes from SOx scrubber (dedicated) for ship engines | ||||||||||||||||||||||||||||||||||
| Light source | Semiconductor laser | ||||||||||||||||||||||||||||||||||
| Laser class | CLASS 1 (laser devices can be Class 1 or Class 3B) | ||||||||||||||||||||||||||||||||||
| Dimensions (W×H×D) mm | Detector: 330 (W) × 880 (H) × 255 (D) mm Extractor: 400 (W) × 300 (H) × 323 (D) mm *Depth varies according to duct diameter Interface: 500 (W) × 400 (H) × 166 (D) mm | ||||||||||||||||||||||||||||||||||
| Weight (excluding cables) | Detector: 30 kg Extractor: 18 kg Interface: 20 kg | ||||||||||||||||||||||||||||||||||
| Housing | Indoor use, IP44 (fully enclosed and splashproof) Extractor fan: IPX4 | ||||||||||||||||||||||||||||||||||
| Materials | Detector: Stainless steel Extractor: Stainless steel Interface: Stainless steel | ||||||||||||||||||||||||||||||||||
| Materials of parts in contact with gas | SUS316L, CaF2, FKM, Silicone, PTFE, Glass, PVDF | ||||||||||||||||||||||||||||||||||
| Power supply | 100-240 Vac, 50/60 Hz | ||||||||||||||||||||||||||||||||||
| Power consumption | Max. rated power 1000 VA | ||||||||||||||||||||||||||||||||||
| Displays | LED indicators | ||||||||||||||||||||||||||||||||||
| Information displayed | Heating, measurement, maintenance request, standby, fault | ||||||||||||||||||||||||||||||||||
| Communication functions | Ethernet / Protocol: Modbus TCP | ||||||||||||||||||||||||||||||||||
| Length of cables | Between receiver and transmitter: 1 m Between detector and interface: ≤ 15 m Between extractor and interface: ≤ 20 m | ||||||||||||||||||||||||||||||||||
| Analog outputs (AO) | 4 to 20 mAcc, 3 points Isolation of ground line and internal circuit. No isolation between signals. Load resistance: ≤ 300 Ω Output signals: SO₂ content, CO₂ content, SO₂/CO₂ ratio. The output signal is forced to 0% during maintenance operations and when the purifier is shut down. | ||||||||||||||||||||||||||||||||||
| Analog inputs (AI) | 4 to 20 mAcc, 1 point Isolation of ground line and internal circuit No isolation between signals Input signals: exhaust gas temperature | ||||||||||||||||||||||||||||||||||
| Digital outputs (DO) | SPST-NO relay contacts, 4 points. Rating: 30 Vdc, 1 A (resistive load). Internal circuit isolation. The contacts are not isolated from each other (shared COM). Output signals: maintenance, heating, sampling stopped, maintenance request, fault analyser (extractor fault, detector fault), power failure | ||||||||||||||||||||||||||||||||||
| Digital inputs (DI) | Voltage inputs, 4 points Contacts ON if input between 18 and 25 V Internal circuit isolation Contacts not isolated from each other (shared COM) Input signals: maintenance, scrubber on/off | ||||||||||||||||||||||||||||||||||
| Performance | |||||||||||||||||||||||||||||||||||
| Accuracy | ≤ ± 2.0% of measurement or ≤ ± 0.3% PE, whichever is greater | ||||||||||||||||||||||||||||||||||
| Detection limit | 2.5 times the standard deviation of 10 repetitive responses: ≤ ± 1.0% PE | ||||||||||||||||||||||||||||||||||
| Noise | ≤ 2.0% PE peak-to-peak | ||||||||||||||||||||||||||||||||||
| Zero drift | ≤ ± 2.0% PE for 6 months | ||||||||||||||||||||||||||||||||||
| Scale drift | ≤ ± 2.0% PE for 6 months | ||||||||||||||||||||||||||||||||||
| Response time (t90) | ≤ 180 s | ||||||||||||||||||||||||||||||||||
| Heating time | ≤ 120 min | ||||||||||||||||||||||||||||||||||
| Interference with other components | With the following component contents in a nitrogen base (N₂): ≤ ± 2.0% PE (1) 500 ppm NO (2) 200 ppm NO₂ (3) 2000 ppm CO (4) 10 ppm NH₃ (5) 10 ppm CH₄ (6) H₂O saturated at 60°C | ||||||||||||||||||||||||||||||||||
The ZQS laser gasanalyser r is designed for the continuous monitoring of SO2 and CO2 emissions from ship exhaust gas cleaning systems
Laser gas analyser - ZQS - for marine applications
Reference : ZQS
