Labkotec OMS-1 User manual

Labkotec Oy
Myllyhaantie 6
FI-33960 PIRKKALA
FINLAND
Tel: [phone]
Fax: [phone].2019
Internet: www.labkotec.com D15530_E-5
1/13
Copyright © 2019 Labkotec Oy We reserve the right for changes without notice
OMS-1
Oil Separator Alarm Device
Installation and Operating Instructions

OMS-1 Oil Separator Alarm Device D15530_E-5
Installation and Operating Instructions
Copyright © 2019 Labkotec Oy 2/13 We reserve the right for changes without notice
TABLE OF CONTENTS
1GENERAL............................................................................................................ 3
2INSTALLATION ................................................................................................... 4
2.1 OMS-1 control unit....................................................................................... 4
2.2 OMS sensor ................................................................................................. 5
2.3 Cable joint .................................................................................................... 5
3OPERATION........................................................................................................ 6
3.1 Modes of operation ...................................................................................... 6
4TROUBLE-SHOOTING ....................................................................................... 8
5REPAIR AND SERVICE...................................................................................... 9
6SAFETY INSTRUCTIONS................................................................................... 9
7TECHNICAL DATA............................................................................................ 10
APPENDIX 1. OMS SYSTEM DRAWING.............................................................. 11
APPENDIX 2. EU DECLARATION OF CONFORMITY.......................................... 12
APPENDIX 3. EU DECLARATION OF CONFORMITY.......................................... 13
SYMBOLS
Warning / Attention
Pay special attention to installations at explosive atmospheres
Device is protected by double or reinforced insulation

OMS-1 Oil Separator Alarm Device D15530_E-5
Installation and Operating Instructions
Copyright © 2019 Labkotec Oy 3/13 We reserve the right for changes without notice
1 GENERAL
OMS-1 is an alarm device for monitoring the thickness of the oil layer
accumulating in an oil separator. The system consists of OMS-1 control
unit, OMS sensor and a cable joint.
Figure 1. Oil separator supervision with OMS-1 alarm device
OMS sensor is installed into the light liquid storage chamber and gives
an alarm when the chamber oil layer reaches a pre-determined level.
The sensor is normally immersed in water.
The function is based on the measurement of the electrical conductivity
of the surrounding liquid –water conducts electricity much better than
oil.
Oil separator is regarded as potentially explosive (Ex) area. OMS-1
sensor can be installed in a zone 0, 1 or 2 potentially explosive area but
the control unit must be mounted in a safe area.
The LED indicators, push button and interfaces of the OMS-1 control
unit are described in figure 2.
Figure 2. OMS-1 control unit - features

OMS-1 Oil Separator Alarm Device D15530_E-5
Installation and Operating Instructions
Copyright © 2019 Labkotec Oy 4/13 We reserve the right for changes without notice
2 INSTALLATION
2.1 OMS-1 control unit
OMS-1 control unit can be wall-mounted. The mounting holes are
located in the base plate of the enclosure, beneath the mounting holes
of the front cover.
The connectors of the external conductors are isolated by separating
plate. The plate must not be removed.
The cover of the enclosure must be tightened so, that the edges touch
the base frame. Only then does the push button function properly and
the enclosure is tight.
Before installation, please read the safety instructions in chapter 6!
Figure 3. OMS-1 alarm device installation.

OMS-1 Oil Separator Alarm Device D15530_E-5
Installation and Operating Instructions
Copyright © 2019 Labkotec Oy 5/13 We reserve the right for changes without notice
2.2 OMS sensor
OMS sensor should be installed as described in figure 3.
The sensor gives an alarm when the upper electrode is in oil.
Please check the correct installation depth also from the instructions of
the oil separator.
2.3 Cable joint
Fig. 4 Cable joint
Connections of the sensor cable inside the cable joint are explained in
figure 3. If shielded cable is used cable shields and possible excess
wires need to be connected to the same point in galvanic contact.
Please make sure, that the sensor and cable between OMS-1 control
unit and the sensor do not exceed the maximum allowed electrical
parameters –see chapter 7 Technical data.
IP rating of the cable joint is IP68. Make sure, that the cable joint is
closed properly.
Notice in cabling: Risk of electrostatic charging!
If the sensor cable must be extended and there is a need for
equipotential grounding, it should be done with the junction box LJB2.
The cabling between the OMS-1 control unit and the junction box
should be done with a shielded twisted pair instrument cable. Maximum
cable length is 100 m.

OMS-1 Oil Separator Alarm Device D15530_E-5
Installation and Operating Instructions
Copyright © 2019 Labkotec Oy 6/13 We reserve the right for changes without notice
3 OPERATION
The operation of the alarm device should be checked always after the
installation. Also check the operation always when emptying the
separator or at least once every six months.
Functionality test
1. Immerse the sensor into water. The device should be in normal mode.
2. Lift the sensor up in air or oil. An Oil alarm should be generated (see
chapter 3.1 for more detailed description).
3. Clean up the sensor.
4. Immerse the sensor back into water. The alarm should go off after a
delay of 10 sec.
A more detailed description of the operation is provided in chapter 3.1.
If the operation is not as described here, check connections and
cabling. If necessary contact a representative of the manufacturer.
3.1 Modes of operation
Normal mode –no alarms
Sensor is totally immersed in water.
Mains LED indicator is on.
Other LED indicators are off.
Relay is energized.
Oil alarm
Sensor is immersed in oil. (the sensor gives an alarm when the upper
electrode is in oil).
Mains LED indicator is on.
Oil Alarm LED indicator is on.
Buzzer on after 10 sec delay.
Relay de-energize after 10 sec delay.
(Note. The same alarm takes place when OMS sensor is in the air.)
After removal of an alarm, the Oil Alarm LED indicator and buzzer will be
off, and relay will be energized after 10 sec delay.
Fault alarm
Sensor cable break, short circuit or a broken sensor.
Mains LED indicator is on.
Sensor circuit Fault LED indicator is on after 10 sec delay.
Buzzer is on after 10 sec delay.
The relay de-energize after 10 sec delay.
Reset of an alarm
When pressing the Reset/Test push button.
Buzzer will go off.
If the buzzer is not reset, it goes off automatically after three days.

OMS-1 Oil Separator Alarm Device D15530_E-5
Installation and Operating Instructions
Copyright © 2019 Labkotec Oy 7/13 We reserve the right for changes without notice
TEST FUNCTION
Test function provides an artificial alarm, which can be used to test the
function of the OMS-1 alarm device and the function of other
equipment, which are connected to OMS-1 via its relay.
Attention! Before pressing the Reset/Test button, make sure that the
change of relay status does not cause hazards elsewhere!
Normal situation
When pressing the Reset/Test push button:
Oil Alarm and Fault LED indicators are immediately on.
Buzzer is immediately on.
Relay de-energize after 2 sec of continuous pressing.
When the Reset/Test push button is released:
LED indicators and buzzer go immediately off.
Relay energize immediately.
Alarm on
When pressing the Reset/Test push button for the first time:
Buzzer will go off.
When pressing the Reset/Test push button after that:
Fault LED indicator is immediately on.
Oil Alarm LED indicator remains on.
Buzzer remains on. If it has been reset earlier, it will return to be on.
When the Reset/Test push button is released:
The device returns right away to the preceding status.
Fault alarm on
When pressing the Reset/Test push button:
The device does not react to the test at all.

OMS-1 Oil Separator Alarm Device D15530_E-5
Installation and Operating Instructions
Copyright © 2019 Labkotec Oy 8/13 We reserve the right for changes without notice
4 TROUBLE-SHOOTING
Problem:
MAINS LED indicator is off
Possible reason:
Device doesn’t get supply voltage.
To do:
1. Check that power separation switch is not switched off.
2. Measure the voltage between poles N and L1. It should be 230 VAC ±
10 %.
Problem:
No alarm when sensor in oil or air, or the alarm will not go off
Possible reason:
Sensor is dirty.
To do:
1. Clean-up the sensor and check the operation again.
Problem:
FAULT LED indicator is on
Possible reason:
Resistance in sensor circuit too high (cable break or out of connector) or
too low (cable in short circuit). The sensor might also be broken.
To do:
1. Make sure, that the sensor cable has been connected correctly to the
OMS-1 control unit.
2. Disconnect sensor’s [+] wire and measure resistance between [+] and
[-] wires. The measured resistance should be 45-51 kΩ.
3. If it is possible measure also resistance between [+] wire and sensor’s
upper electrode. The measured resistance should be 1,1 –1,3 kΩ.
4. If the resistance values in items 2 and 3 are correct, then OMS-1
control unit is defective, otherwise problem is in cabling or in sensor.
If the problem can not be solved with the above instructions, please
contact Labkotec Oy’s service.
Attention! If the sensor is located in an explosive atmosphere, the
multimeter must be Exi-approved!

OMS-1 Oil Separator Alarm Device D15530_E-5
Installation and Operating Instructions
Copyright © 2019 Labkotec Oy 9/13 We reserve the right for changes without notice
5 REPAIR AND SERVICE
The sensor should be cleaned and the operation should also be tested
when emptying the oil storage chamber or at least once every six
months. The easiest way to check the operation is to lift the sensor up
in the air and to put it back to the separator. The operation is described
in chapter 3.
For cleaning, a mild detergent (e.g. washing-up liquid) and a scrubbing
brush can be used.
In case of queries, please contact Labkotec Oy’s service.
6 SAFETY INSTRUCTIONS
OMS-1 control unit must not be installed in potentially explosive
atmosphere. Sensors connected to it may be installed in zone 0, 1 or 2
potentially explosive atmospheres.
In case of installations in explosive atmospheres the national
requirements and relevant standards as IEC/EN 60079-25 and/or
IEC/EN 60079-14 must be taken into account.
Warning! If the cabling is voltage-tested, the sensor must be
disconnected.
If electrostatic discharges can cause hazards in the operating
environment, the device must be connected into equipotential ground
according to requirements with regards to explosive atmospheres.
Equipotential grounding is made by connecting all conductive parts into
same potential e.g. at the cable junction box. Equipotential ground must
be earthed.
The device does not include a mains switch. A two pole mains switch
(250 VAC 1 A), which isolates both lines (L1, N) must be installed in the
main power supply lines in the vicinity of the unit. This switch facilitates
maintenance and service operations and it has to be marked to identify
the unit. Fuse maximum 10 A.
When executing service, inspection and repair in explosive atmosphere,
the rules in standards IEC/EN 60079-17 and IEC/EN 60079-19 about
instructions of Ex-devices must be obeyed.

OMS-1 Oil Separator Alarm Device D15530_E-5
Installation and Operating Instructions
Copyright © 2019 Labkotec Oy 10/13 We reserve the right for changes without notice
7 TECHNICAL DATA
OMS-1 control unit
Dimensions
125 mm x 75 mm x 35 mm (L x H x D)
Enclosure
IP 65, material polycarbonate
Operation temperature
-30 ºC…+50 ºC
Supply voltage
230 VAC ± 10 %, 50/60 Hz
The device is not equipped with a mains
switch.
Fuse maximum 10 A.
Power consumption
1 VA
Sensors
OMS sensor
Relay output
Potential-free relay output
250 V, 5 A, 100 VA
Operational delay 10 sec. Relay de-
energize at trigger point.
Electrical safety
IEC/EN 61010-1, Class II , CAT II
Insulation level
Sensor / Mains supply
voltage
375V (IEC/EN 60079-11)
EMC Emission
Immunity
IEC/EN 61000-6-3
IEC/EN 61000-6-1
Ex-classification
Special conditions (X)
ATEX
IECEx
II (1) G [Ex ia] IIB
(Ta = -30 C…+50 C)
VTT 12 ATEX 003X
IECEx VTT 12.0001X
Electrical parameters
Characteristic curve of the
output voltage is linear.
See table 1.
Uo = 6,6 V Io = 20,2 mA
Po = 33,3 mW
Manufacturing year:
Please see the serial number
on the type plate
xxx x xxxxx xx YY x
where YY = manufacturing year
(e.g. 19 = 2019)
In the cable parameters of OMS-1 sensor
connection must be taken into account the
interaction of capacitance and inductance. The
table below indicates the connecting values in
explosion group IIB. In explosion group IIA the
values of the group IIB can be applied.
Max. permissible value
Combined Co and Lo
Co
Lo
Co
Lo
II B
500 μF
300 mH
40 µF
20 µF
12 µF
10 µF
8,5 µF
0,15 mH
0,5 mH
1,0 mH
2,0 mH
5,0 mH
Table 1. OMS-1 electrical parameters
OMS sensor
Principle of operation
Measurement of conductivity
Material
PVC, AISI 316
IP-classification
IP68
Temperature
Operation: 0 ºC…+60 ºC
Safety: -30 ºC …+60 ºC
Cable
Oil-proof cable 2 x 0.75 mm2. Standard
length 5 m, other lengths optional. The
max. length of the fixed cable is 15 m.
Can be extended up to 100 m..
EMC Emission
Immunity
IEC/EN 61000-6-3
IEC/EN 61000-6-1
Ex-classification
II 1 G Ex ia IIA T6 Ga
According to IEC/EN 60079-11 simple
apparatus.
Manufacturing year:
Please see the serial
number on the type plate
xxx x xxxxx xx YY x
where YY = manufacturing year
(e.g. 19 = 2019)
Figure 5. Dimensional drawing of OMS sensor