Oldham olct ir, Technical Manual

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12 User Manual
3. INSTALLATION
WARNING: Before proceeding refer to paragraph #7, “Specific Instructions for Assembly in Explosive Atmospheres”.
Safety Precautions
The detector must be installed in an appropriate location to enable optimal protection.
The OLCT IR shall be mounted horizontally so that the arrow on the weather protection looks upward .
If mounted incorrectly, the OLCT IR detector may not be able to detect gases or vapors in the air.
Mechanical installation
- Follow carefully the safety instructions outlined above
- Look at figures 1 and 4 for the dimensions of the OLCT IR
- The OLCT IR detector is intended to be mounted on a vertical support structure, such as a wall. When it
has to be mounted on a horizontal surface, use the ceiling mount (part number 6322420, see Fig. 5).
Electrical installation
- Ensure that the installation complies with currently enforced standards, EN/IEC 60079-14, EN/IEC 60079-
17 standards, zone classification, and all other enforced editions or national standards.
- To ensure proper operation of the detector, the cable resistance must remain within the limits specified in
the technical specifications table.
- Make sure the power supply at detector terminals is between 16 and 30 VDC
- Remove the weather protection (see Rep. 4, Fig. 2) to access the terminal block
- Connect the 3 active wires as shown in Fig. 3
- Replace the protective cover
- Ground the detector casing (Fig. 1)
4. START UP
- Verify that all equipment connections and installations have been performed correctly.
- To avoid false alarms, inhibit the controller or the PLC.
- Power up the OLCT IR and wait 2 or 3 minutes for stabilization (during warming-up, the signal output is
set to 2 mA)
- Check the zero (4 mA) and gas response. When zeroing a CO
2
version, apply nitrogen.