Labkotec OMS-1 Manuel utilisateur

Labkotec Oy

Myllyhaantie 6

FI-33960 PIRKKALA

FINLAND

Tel: +358 29 006 260

Fax: +358 29 006 1260 8.8.2019

Internet: www.labkotec.com D15530_E-5

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OMS-1

Oil Separator Alarm Device

Installation and Operating Instructions

OMS-1 Oil Separator Alarm Device D15530_E-5

Installation and Operating Instructions

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

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

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

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

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

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

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

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

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

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

Table des matières

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