WS10
WS10 Series
W AT E R S E N S O R
s e r v i c e
i n s t r u c t i o n s
4
2. SPECIFICATION
Measuring Values
Humidity Sensor
Measuring range:
0...100 % Rh
Accuracy incl. hysteresis
±2.0 % Rh (0...90 % Rh)
and nonlinearity in air:
±3.0 % Rh (90...100 % Rh)
Traceable to internal
standards, administrated by
NIST, PTB, BEV...
Temperature dependence % Rh: ±(0.022 + 0.02 x % Rh) x
Δ
T [°C]
Δ
T = T - 20 °C
T: ±(0.0003 °C/°C)
Temperature Sensor
Working range sensing probe:
-25...125 °C (-13...257 °F)
Outputs
Two analogue outputs for
4-20 mA Load <500 Ohm
% Saturation and Temperature: Out 1 = 0 to 100 %
Out 2 = -25 °C to 125 °C
(-13 °F to 257 °F)
General
Supply voltage:
21...28V DC
Current consumption at 24V DC:Typically 80mA
Pressure range:
0...20 bar (0...290 psi)
or 0...100 bar (0...1450 psi)
Housing / Protection class:
Al Si 9 Cu 3 / IP65
Electrical connection:
M12 connector
Fluid temperature range:
-40...125 °C (-40...257 °F)
Electronics temperature range: -40...80 °C (-40...176 °F)
Storage temperature range:
-40...60 °C (-40...140 °F)
Electromagnetic compatibility:
according to EN61326-1,
EN61326-2, EN61326-3.
FCC Part 15 Class B.
Industrial Environment
ICES-003 Class B.
1. PRODUCT
DESCRIPTION
1.1
General
The Pall WS10 Water sensor was designed for the
measurement of water content in oil. WS10 is
used for online monitoring of moisture in
lubrication or insulation oil, which is very
important for the long-term performance and
preventive maintenance of plant and machinery.
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 (actual water content expressed as a
fraction of the water content in saturated oil) and
called percent relative humidity (% RH). % 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, any further addition of water will result
in the presence of droplets of free water. % RH
measurement with the WS10 transmitter is based
on the outstanding long term stability and
resistance to pollution of the capacitive sensor
elements.
The WS10 transmitter has two analogue outputs,
4–20mA, for connection to customers existing
SCADA and DCS systems. The analogue outputs
represent humidity in % RH, and temperature. If
oil is cloudy due to free water contamination at
the measurement temperature, the WS10 Water
Sensor will output a signal that represents 100 %
saturation, until steps are taken to bring the water
content below the saturation point.
1.2
Dimensions in mm (inch)
M12 connector
spanner width:
27 or 24
