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Application area
Water is not desired in hydraulic fl uids and lubricants. High
concentration of water can cause severe dis turbance in
operation and damage.
Performance features
The LubCos H
2
O measures the relative humidity of the oil and
thus directly displays the saturation degree in the water:
› 0%: Absolutely dry oil.
› 100%: The oil is completely saturated with water. Additional
water will not be dissolved anymore and will present itself as
free water.
In contrast to the humidity analysis from laboratories, where the
absolute water content is defi ned in ppm (parts per million), the
saturation limit of the oil can be determined by relative humidity
measurement. The advantage of the relative humidity over the
absolute water content is, that it is not necessary to know the oil
or its saturation limit in order to determine if there is free or
dissolved water.
Example:
› Mineral oils (e.g. HLP) have a comparatively low water
absorption capacity. 500 ppm may signify that the oil is
over-saturated and that free water exists.
› Ester oils (e.g. HEES) have a relatively high water capacity.
500 ppm may show that the oil is just saturated by 15%.
Please also note the characteristics of the relative humidity with
different temperatures: Warm oil can dissolve more water than
cold oil. Therefore, the relative humidity of the oil increases in
case of no further water supply. Hot, relatively dry oil, may
suddenly keep free water if the ambient temperature cools
down.
The LubCos H
2
O points out the current saturation of the oil with
water, independent from oil type and temperature and addi tionally
assures operation of systems by direct warning.
Measuring principle
The sensor records the relative oil humidity and oil temperature.
Through an oil specifi c calibration it is possible to calculate the
absolute humidity up to the saturation limit.
The measuring values are given by RS 232 and the analogue
outputs.
LubCos H
2
O
Continuous Oil Condition Monitoring
Humidity Sensor
Description
Ø42 mm (Ø1.65 inch)
M12 x 1*
54 mm (2.13 inch)
44 mm (1.73 inch)
AF 32*
14 mm (0.55 inch)
G¾
* mm
Ø21.6 mm (Ø0.85 inch)
43 mm (1.69 inch)
Dimensions
LubCos H
2
O
Subject to change · 100.00-EN/US · 0919
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Design characteristics
The sensor is provided with a G¾ thread and can be integrated
in the tank or via adapter in lines.
Communication with the sensor either takes place over a serial
interface or over two analog outputs (4 ... 20 mA).
Software
A free software for data recording and evaluation of the
measured values can be downloaded from our website at
www.argo-hytos.com > Products > Sensors & Measurements >
Software.
Measuring range
Rel. humidity
Temperature
0 ... 100
-20 ... +85
(-4 ... +185
%
°C
°F)
Measuring accuracy
Rel. humidity
Temperature
1
0.1
% r.H.
K
Measuring accuracy
6
Rel. humidity (10 ... 90%)
7
Rel. humidity (<10%, >90%)
7
Temperature
±3
±5
±2
% r.H.
% r.H.
K
Response time humidity
measurement (0 to 100%)
<1 min
Weight 115 g
1
Outside the specified measuring range, there are possibly no plausible
measuring values to be expected
2
With screwed on connector
3
Automatic switch off at U <8 V and U >36 V,
with load-dump impulses over 50V an external protection must be provided
4
Outputs IOut1 and IOut2 are freely configurable
(see interfaces and communication commands)
5
In relation to the analogue current signal (4 ... 20 mA)
6
Works calibration
7
Calibrated to air at room temperature
LubCos H
2
O SCSO 300-1000
Accessories
Screw-in block for mounting in
a return line, connection G¾
SCSO 100-5070
Complete data cable set,
5 m (16 ft) length
SCSO 100-5030
Data cable with open ends,
5 m (16 ft) length
SCSO 100-5020
Contact box for connection of
a data cable
SCSO 100-5010
USB adapter - RS 232 serial PPCO 100-5420
Power supply SCSO 100-5080
Ethernet - RS 232 gateway SCSO 100-5100
Display and storage device
LubMon Visu
SCS0 900-1000
Order code
Sensor data Size Unit
Max. operating pressure 50 (725) bar (psi)
Operating conditions
Temperature
1
Rel. humidity
1
-40 ... +105
(-40 ... +221
0 ... 100
°C
°F)
% r.H.
(non-con-
densing)
Compatible fluids mineral oils
(H, HL, HLP, HLPD, HVLP),
synthetic esters
(HETG, HEPG, HEES, HEPR),
polyalkylenglycols (PAG),
zinc and ash-free oils (ZAF),
polyalphaolefins (PAO)
Wetted materials aluminum, HNBR,
polyurethane resin, epoxy
resin, chemical nickel/gold
(ENIG), soldering tin
(Sn60Pb40,Sn96,5Ag3CuO,5
NiGe), aluminum oxide,
glass (DuPont QQ550)
Protection class
2
IP67
Power supply
3
) 9 ... 33 V
Power input max. 60 mA
Output
Power output (2x)
4
Accuracy power output
5
Interface
4 ... 20
± 2
RS 232
mA
%
-
Connections
Threaded connection
Tightening torque of
threaded connection
Electrical connection
Tightening torque
M12-connector
G¾
45 ±4.5
M12 x 1,
8-pole
0.1
inch
Nm
-
Nm
Technical data
Subject to change · 100.00-EN/US · 0919
