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C O N T E N T S

I. Description of the OLC / OLCT20 family.........................................................................11

1. General..........................................................................................................................11

2. Main characteristics of the various versions .................................................................12

II. Description of the OLCT40 / OLCT40D family .............................................................13

1. General..........................................................................................................................13

2. Main characteristics of the various versions .................................................................13

III. Mechanical installation of the various versions.............................................................14

1. OLC20 and OLCT20.....................................................................................................14

2. OLC20D and OLCT20D (remote version) ...................................................................14

3. OLCT 40 .......................................................................................................................14

4. OLCT 40D (remote version).........................................................................................14

IV. Wiring of the various versions.........................................................................................14

1. 3-Wire versions .............................................................................................................14

2 2-wire versions ..............................................................................................................14

3. 2-wire Intrinsic Safety versions.....................................................................................14

V Maintenance.........................................................................................................................15

1. Detectors OLC20 and OLC20D....................................................................................15

1.1. CALIBRATION....................................................................................................15

1.2. Replacing a cell unit on OLC 20 or OLC 20 D.....................................................16

2. Transmitters OLCT20/20D and OLCT40/40D.............................................................16

2.1 CALIBRATION......................................................................................................16

2.2 . CALIBRATION SPECIFICATIONS...................................................................18

2.3 Replacing a cell unit on OLCT 20/20D or OLCT 40/40 D....................................18

VI. List of spare parts............................................................................................................19

1 Explosion-proof cell units OLCT 20/20 D and OLCT40/40D.......................................19

2 Intrinsic safety cell units OLCT 20/20 D and OLCT40/40D.........................................20

3. Explosion-proof cell units OLC20 and OLC20D (remote cell).....................................21

VII. List of accessories for detectors OLC20/20D and transmitters OLCT20/20D,

OLCT40/40D..................................................................................................................22

ISC/Oldham OLC20 Series User Manual

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