The capacitive Water Level Sensor (WLS) continuously measures free water level below the oil surface and provides input for on-line net inventory. The sensor is integrated with the
Multiple Spot Thermometer (MST).
The WLS is welded to the MST to get a hermetic design and it has no moving parts.
The WLS output is an analog 4-20 mA or digital HART signal, which is connected directly to a radar gauge.
There is a PT100 temperature sensor inside the probe, allowing measurements at low levels.
The WLS is designed for difficult applications in corrosive environments and is detachable for repair.
The open model WLS is suitable for crude oil applications and the closed model is suitable for lighter fuels such as diesel etc.
A junction box can be integrated with the WLS.
Technical Data
Active measuring range:
500 mm (20 in.) or 1000 mm (40 in.). Optional 1500 mm (60 in.).
Output analog:
2 wire, 4-20 mA with Imax=23 mA.
Output digital:
HART (SMART) transmitter. For highest resolution, HART communication must be used.
Accuracy:
± 2 mm (0.08 inch) for 500 mm active length,
± 4 mm (0.16 inch) for 1000 mm active length,
± 6 mm (0.24 inch) for 1500 mm active length.
Repeatability:
± 0.5 mm (0.02 inch).
Operating temperature:
0 to +120 °C (32 to +250 °F). Maximum temperature at mounting flange is +80 °C (+180 °F).
Max. pressure:
6 bar (90 psig).
Explosion protection:
DEMKO 01 ATEX 131128X, CE 0539 Ex II 1 G, EEx ia IIB T4, UL approval pending.
Mechanical dimensions:
Connection thread: M33x1.5 mm.
Length: Active length + 140 mm (5.5 in.)
Outer diameter of WLS, closed model: Ø=38 mm (1.5 in.).
Outer diameter of WLS, open model: Ø=48 mm (1.9 in.).
Immersed material:
AISI 316, FEP, PTFE and PEEK with 30% glass.