Applications
- Abstraction point monitoring
- Hydrocarbon detection in stored waters
- Hydrocarbon monitoring within ports and coastal areas
- Pollution tracking in streams and estuaries
- Road and airport run-off pollution monitoring
Features
- Real-time display of dissolved aromatic hydrocarbon levels (in µg/l)
- Automated data logging (2Gbyte storage capacity)
- 4 – 20mA output for data export in real-time
- Relay for audible alarm
- In-line flow-through operation with standard pipe fittings
- High sensitivity
Introduction
CTG’s OIL-Station and OIL-Station Pro systems provide process engineers and site managers with real-time measurements of dissolved Polycyclic Aromatic Hydrocarbon (PAH). The OIL-Station comprises a CTG UviLux fluorometer and a Watchkeeper wall mounted data display and logger. CTG’s UviLux fluorometers detect UV fluorescence with industry- leading sensitivity and selectivity and have been optimised for minimal interference from water turbidity. Data is displayed on the Watchkeeper’s colour touchscreen and is logged internally. Up to three 4 - 20mA outputs are provided for data transmission.
Examples of detectable compounds include:
- Carbazole
- Phenanthrene
- Naphthalene (NDSA)
- BTEX
- Perylene
- Pyrene (PTSA)
- Benzo[a]pyrene
What is the difference between OIL-Station & OIL-Station Pro?
The OIL-Station comprises a single CTG UviLux fluorometer and a Watchkeeper wall mounted data display and logger. The UviLux fluorometer is factory- configured for refined PAH detection. The OIL-Station Pro includes an additional UviLux sensor for either refined and crude PAH determination, or for discriminating PAH from a high background of Coloured Dissolved Organic Matter (CDOM). The second sensor in the OIL-Station Pro provides inherent robustness to varying CDOM background, for example when correlating PAH levels across a wide range of locations.
How does it work?
CTG’s OIL-Station and Oil-Station Pro detect PAH fluorescence. When dissolved PAH compounds absorb UV light they re-emit a fraction of this energy as fluorescence at longer wavelengths. Fluorescence intensity is directly proportional to PAH concentration.The technique is widely recognised as one of the most sensitive detection methods available.
CTG’s UviLux sensors use a stabilised UV LED light source and a photomultiplier detector to provide exceptional measurement sensitivities. By exciting fluorescence at deep UV wavelengths the UviLux fluorometers can detect smaller PAH compounds typically associated with weathered oils.
Carbazole fluorescence map indicating UviLux (refined) measurement window
Configuration
The OIL-Station and OIL-Station Pro have been designed for outdoor operation, where the UviLux fluorometers can be deployed within a water trough or mounted in flow-through manifolds for in-line operation. A single cable connects the UviLux fluorometers to the Watchkeeper display and logger unit, which is powered from a 24 Vdc supply. Signal inputs are presented on the screen and up to three 4 – 20 mA signals can be accessed for data system networking. Audible alarms or control valves can be fitted and programmed to alert or activate when signals exceed user-set thresholds.
Data is recorded onto a 2 Gbyte memory card. Data can be download via a USB cable, or by removal of the memory card.
Specification
UviLux Fluorometer
| Size |
Ø70 x 150 mm
|
| Weight |
800g
|
| Pressure Rating |
60 bar
|
UviLux Performance
| |
PAH fuel |
CDOM (crude) |
| Sensitivity (QSU) |
0.06
|
0.03
|
| Calibrated range (QSU) |
600 |
600
|
| Example compound: sensitivity – range (ppb) |
BTEX*:
3.0-50,000 |
Perylene:
0.003-50 |
*BTEX is Benzene, Toluene, Ethylbenzene, p‑Xylene, m‑Xylene, o‑Xylene at equal ppb concentrations
OIL-Station, single UviLux fluorometer with Flow Manifold
| Size |
Ø130 x 200 mm
|
| Weight |
2.5 kg
|
| Fluid connections |
Union, 20mm, PN16
|
| Pressure rating |
4 bar
|
| Max operating temp. |
55 °C
|
OIL-Station Pro, two UviLux fluorometers with Flow Manifolds
| Size |
265 x 200 x 200 mm
|
| Weight |
5 kg
|
| Fluid connections |
Union, 20mm, PN16
|
| Pressure ratings |
4 bar
|
| Max operating temp. |
55 °C
|
Watchkeeper display and logger
| Display |
320 x 240 pixel qVGA backlit LCD
|
| Display size |
70 x 50 mm
|
| Size |
200 x 110 x 60 mm
|
| Weight |
900 g
|
| Memory capacity |
2 Gbyte
|
| IP rating |
IP67
|
| Voltage input |
24 Vdc
|
| Power |
2.8 W @ 24 Vdc
4.6 W @ 24 Vdc (Pro)
|
| Temperature range |
-20 °C to 55 °C
|
In view of our continual improvement, the designs and specifications of our products may vary from those described.
