WS09
WS09 Series
WATER SENSOR service instructions
2. SPECIFICATION
Dimensions: 85 mm W X 145 mm L X 37 mm D
(3.3" W x 5.7" L x 1.5" D)
Weight: 400 g (0.9 lb)
Power Supply: 4 x 1.5V AA alkali-manganese battery
Battery lifetime: 200 hours
Housing / Protection: ABS / IP40
Temperature: Probe Tip: -40 – 120 °C (-40 – 248 °F)
Hand Held Display: 0 to 50 °C (32 to 122 °F)
Grip of Sensing
Probe: 0 to 50 °C (32 to 122 °F)
Fluids: Petroleum and synthetic fluids
and fuels
Probe Cable: 2 m (6.6 ft)
Hand Held Display
and Grip of Sensing
Probe: Nema 1 / IP 40 BSEN60529
Sensing Probe: Nema 4 / IP 66 BSEN60529
Accuracy: ± 2 % 0 to 90 % RH and
± 3 % 90 to 100 % RH
CE compatibility: EN61000-6-4, EN61000-6-2, EN55011,
EN61000-4-2 EN61000-4-3
Display: LC display, 90 x 50 mm (3.5 x 2"),
illuminated.
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1. INTRODUCTION
The Pall WS09 Hand Held Water sensor was designed for the
measurement of water content in hydraulic, lubricating and
insulating fluids. Percentage saturation and temperature is
measured by immersing the sensing probe into the fluid
stream, reservoir or fluid sample. After a short stabilization
period the WS09 LCD displays the percentage water saturation
level and temperature in °C or °F. The probe is suitable for use
in a wide range of mineral and synthetic fluids at temperatures
up to 120 °C (248 °F). The WS09 transmitter features
outstanding long term stability and resistance to pollution of
the capacitive sensor elements.
Water contamination in oil and fluids can cause problems such
as additive depletion, corrosion, oil oxidation, reduced
lubricating film thickness, microbial growth and a reduction of
dielectric strength.
Humidity measurement in oil is similar to the humidity
measurement in the air; the actual water content in oil can be
indicated by the relative value % RH.
% RH (expression of the water content as a percentage of the
water saturation level of the oil at the measured temperature)
and called percent relative humidity. % RH = 0 corresponds
to completely water-free oil, while % RH = 100 indicates
saturated oil. Saturation is the point where oil holds as
much water as possible in solution at given temperature,
any further addition of water will result in the presence of
droplets of free water.
The physical quantities measured are % relative humidity,
% RH, and temperature, T. With these quantities the Pall WS09
Water sensor can calculate, and display, the water content in
parts per million (ppm), provided that the fluid constants for the
specific fluid have been entered into the unit.
The WS09 is capable of displaying two outputs at one time.
These outputs are shown on the display as sensor 1 and
sensor 2. Sensor 1 is set to temperature and sensor 2 is set to
% relative humidity as default. The display may be changed
using the menu function. For example sensor 1 can be set to
either °C or °F temperature and sensor 2 can be set to either
% relative humidity (% saturation) or water content in PPM.
Calculation of water content in fluids can be accomplished by
entering specific fluid constants for the fluid; contact Pall for
the fluid constants.
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