Unit III System Installation, Controller Wiring

sensitivity levels by programming the controller to respond at a pre-determined detector count rate which is dependent upon the intensity of the ultraviolet radiation reaching the detector, which in turn depends on the type of fuel, temperature, flame size, distance from the detector and concentration of UV absorbing vapors present.

Programming the controller to respond to a low count rate results in high system sensitivity.

Unit III SYSTEM INSTALLATION

INSTALLATION

GENERAL WIRING REQUIREMENTS

NOTE

The wiring procedures in this manual are intended to ensure proper functioning of the device under normal conditions. However, because of the many variations in wiring codes and regulations, total compliance to these ordinances cannot be guaranteed. Be certain that all wiring complies with applicable regulations that relate to the installation of electrical equipment in a hazardous area. If in doubt, consult a qualified official before wiring the system.

Shielded cable is highly recommended for power input and signal wires to protect against interference caused by extraneous electrical 'noise'. Relay outputs do not require shielded cable. Recommended detector cable is four conductor, shielded cable, 18 AW G, rated 300V. If the wiring cable is installed in conduit, the conduit must not be used for wiring to other electrical equipment. Detectors can be located up to 2000 feet (600 metres) from the controller.

W ater will damage electronic devices. Moisture in the air can condense within electrical conduit and drain into the enclosure, therefore, water-proof and explosion-proof conduit seals are recommended to prevent water accumulation within the enclosure. Seals should be located as close to the device as possible and not more than 18 inches (46 cm) away. Explosion-proof installations may require an additional seal where conduit enters a non-hazardous area. Conform to local wiring codes.

W hen pouring a seal, use a fibre dam to assure proper formation of the seal. The seals should never be poured at temperatures below freezing.

The jacket and shielding of the cable should be stripped back to permit the seal to form around the individual wires. This will prevent air, gas and water leakage through the inside of the shield and into the enclosure.

It is recommended that explosion-proof drains and conduit breathers be used. In some applications, alternate changes in temperature and barometric pressure can cause 'breathing' which allows moist air to enter and circulate inside the conduit. Joints in the conduit system are seldom tight enough to prevent this 'breathing'.

CONTROLLER WIRING

NOTE

The controller contains semiconductor devices that are susceptible to damage by electrostatic discharge. An electrostatic charge can build up on the skin and discharge when an object is touched. Therefore, use caution when handling, taking care not to touch the terminals or electronic components. For more information on proper handling, refer to the Appendix.

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0016-00, UVC120, MAN -0016-00 specifications

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