PRODUCT INFORMATION
WLS - Water Level Sensor
The Water Level Sensor, WLS, is High reliability
used for continuous measurement The WLS is designed for heavy-duty
of free water in oil tanks providing service and has no moving parts. it is
on-line net inventory.The sensor factory calibrated and requires no field
is integrated with a Multiple Spot tuning.
Thermometer (MST). It is also pos-
sible to add a Pt 100 spot element Rugged construction
allowing temperature measure- The WLS is designed for difficult appli-
ments at low levels. cations in a corrosive environment. Im-
The WLS continuosly measures mersed parts are made of acid-proof
Multiple Spot
the interface level between water steel AISI 316, FEP, PTFE and PEEK Thermometer
and oil, thereby providing net in- with 30% glass. The WLS is welded to
ventory for the user.The standard the MST to get a hermetic design.
measuring range is 500 mm. Tank wall
WLS
Interface level
The WLS is typically installed toghether with
an Multiple Spot Thermometer
Features
• Gives important inventory data
• Rugged design
• Close to bottom measurements
• Accurate
• Special crude version
• Integrates with the Saab TankRadar
Rex complete tank gauging system
• Easy to install
• Hart output and configuration
• Wide temp ranges
Water Level Sensor including junction box. • ATEX approved
A typical application Closed model Open model
The WLS is installed together with an MST to be hung from
mm (inch) Protective cable mm (inch) Protective cable
the top of the tank. The vertical position is chosen according hose or Multiple
Spot Thermometer
hose or Multiple
Spot Thermometer
to the actual bottom water range. It should be anchored to
the tank bottom to ensure a fixed position in case of turbu-
lence. The open model is suitable for crude oil applications.
The closed model is suitable for lighter fuels such as diesel
Option: 1000 (39.37) or 1500 (59.96)
oil. For highest resolution, the HART communication option
Option: 1000 (39.37) or 1500 (59.96)
is used.
L+140 (5.5) L+140 (5.5)
Standard: 500 (19.96)
Sensor electrode Sensor electrode
Active length (L) =
Anchor weights can be mounted in eye bolt. It can also be
Standard: 500 (19.96)
Active length (L) =
Optional temperature
mounted above the WLS. In that case is the weight hollow spot element Pt100
Optional temperature
spot element Pt100
300 (11.8) from 300 (11.8) from
and fitted on the MST. eye bolt eye bolt
Anchoring Anchoring
facility facility (eye bolt)
38 (1.50) 48 (1.90)
Specification WLS - Water Level Sensor
Active measuring range 500 mm (20 in.), 1000 mm (40 in.) or 1500 mm (60 in.)
Analog output 2 wire 4 - 20 mA with Imax = 23mA
Digital output HART (SMART) Transmitter
Accuracy ±2 mm (0.08 in.) [500 mm active length]
±4 mm (0.16 in.) [1000 mm active length]
±6 mm (0.24 in.) [1500 mm active length]
Factory Calibration Calibrated under conditions εr = 2.3 (diesel) via 2 wire loop (other on request)
Operating temperature 0 - 120 °C (32 °F to 250 °F) [Max. temp. at mounting flange 80 °C (180 °F)]
Mechanical dimensions Connection thread ø32x1.5mm.
Outer diameter of WLS Closed ø 38 mm (1.5 in.)
Open ø 48 mm (1.9 in.)
Immersed materials AISI 3 1 6, FEP, PTFE, and PEEK with 30% glass
Max. pressure 6 bar (90 psig)
Ex approvals DEMKO 01 ATEX 131128X, 0539, 11 1 G, EEx ia 11B T4. UL approval
pending.
Quality and environmental system certified by DNV - ISO 900I - ISO 14001
Your local representative:
HEADQUARTERS:
Saab Rosemount Tank Control
Box 130 45
SE-402 51 Göteborg. SWEDEN
Tel: int. +46 31 337 00 00
Fax: int. +46 31 25 30 22
E-mail: sales.srt@emersonprocess.com
Website: www.saabrosemount.com
Find your local Saab representative on our website
Copyright © Saab Marine Electronics AB. First Edition. February 2003 Ref.no: 109526 E
