INSTRUCTIONS Unitized Ultraviolet Detector/Controller U7602 7/95 Form 95-8239-03
SERVICE MEMO Precautions for Handling Electrostatic Sensitive Devices With the trend toward increasingly widespread use of microprocessors and a wide variety of other electrostatic sensitive semiconductor devices, the need for careful handling of equipment containing these devices deserves more attention than it has received in the past. * Electrostatic damage can occur in several ways. The most familiar is by physical contact.
Table of Contents SYSTEM APPLICATION ..........................................................1 List of Illustrations FEATURES ..............................................................................1 GENERAL APPLICATION INFORMATION .............................2 Figure 1 U7602 Detector/Controller Components ..............3 SYSTEM DESCRIPTION .........................................................3 Detector ............................................................................
INSTRUCTIONS Unitized Ultraviolet Detector/Controller U7602 SYSTEM APPLICATION The Det-Tronics U7602 Unitized Detector/Controller model is an ultraviolet (UV) flame detector and controller housed in a single, explosion-proof enclosure. It provides fast, reliable flame detection in a wide variety of applications. The U7602 uses the Automatic Optical Integrity (oi) feature, which provides a continuous check of detector optical surfaces and detector/controller circuitry.
• Designed to meet MIL-STD-810C for shock and vibration. • Designed for use in hazardous locations (explosionproof enclosure). • Bracket mounted with swivel for ease of installation and positioning. • Enclosure material available in red anodized copper-free aluminum or 316 stainless steel. • Model available with 3 amp relay contact rating and 4 to 20 ma current output. • Optional LED indicators.
The highest reliability with regard to response to a fire is achieved when a hazardous area is supervised by more than one detector, and when each detector can independently register an alarm. mounted in the same enclosure with the UV sensor, but is optically isolated from the sensor by a cylindrical optical shield.
period, the Fire relay is energized and the current output signal rises to a level indicating that the U7602 is seeing a fire. If the detector module is equipped with an LED, it will illuminate. The Fire relay time delay (the time between when a flame is detected and the Fire relay is energized) is factory-set at 5 seconds, but is field adjustable from 0.025 to 30 seconds so that it can be set to fit each particular installation.
CONE OF VISION— The U7602 detector has a nominal 90 degree cone of vision, with the highest sensitivity lying along its central axis, as shown in Figure 5. Table 2—Current Signal Output Levels SYSTEM SENSITIVITY— The U7602 Detector/Controller is set at the factory for 25 cps (counts per second). Other sensitivity settings are available as an option. When the sensitivity is set at 25 cps, the U7602 can respond to a gasoline flame with a one-square-foot burning surface area (0.
DETECTOR SENSITIVITY MOUNTING KEYHOLES (2) 2.0 (50.8) APART SEE DETAIL "A" 1.0 (25.4) 1.0 (25.4) The UV flame detector responds to radiation over wavelengths of 185 to 245 nanometers (1850 to 2450 angstroms). Figure 8 illustrates the range of sensitivity, and compares this range to other forms of radiation. Note that UV radiation reaching the earth from the sun does not extend into the sensitivity region of the detector.
NOTE Ultraviolet detectors are very sensitive to arc welding, and if this type of radiation can be expected, it must be controlled through proper application. Successful application techniques include careful positioning and shielding of the detector/controllers. Refer to Figure 9 and consider the factors described above (distance to potential fire, probable fire size, extraneous UV presence) to establish the correct system sensitivity requirements.
copper-sheathed cables, select an approved gland with a watertight compression stage and an overall gland shroud for outdoor applications. A sealing washer must be fitted between the gland and the conduit entry to ensure IP66 rating. WIRING REQUIREMENTS The system should be wired using a 16 to 22 gauge (1.5 to 0.5 mm2) cable. If the current signal output line is used, it must be a separate shielded wire to protect against interference.
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 haz- ardous area. If in doubt, consult a qualified official before wiring the system. 1.
ALARM INPUT FIRE ALARM PANEL oi TEST U7602 + – TB1 + – 5 4 3 oi * TB3 FIRE FAULT NO NC 1 2 510 OHM 1 WATT CURRENT * FIRE RELAY IS NORMALLY OPEN. FAULT RELAY IS NORMALLY CLOSED AFTER POWER-UP TIME DELAY, IN A NO FAULT CONDITION.
faults are indicated (with no power applied, the Fault relay is normally open, when power is applied the contacts close after a 5 second time delay). Terminal 3 is the current output. Attach the wires to the appropriate screw terminals on the terminal block. Figure 11 shows TB3 connections (relay and current output) for the standard controller module as described above. Figure 12 shows TB3 connections for the optional Form C and 4 to 20 ma controller modules. 12.
DETECTOR MODULE JUMPER PINS (2) JUMPER MUST NOT BE INSTALLED MOUNTING LEGS (4) MUST FIT TIGHT ONTO MOUNTING BLOCK GUIDE PIN B150 3 Figure 17—Detector Module Mounting 1. Disable any alarm and extinguishing equipment being controlled by the U7602. oi RING UV TEST LAMP* OPENING 2. Apply input power to the U7602. Allow a five second power-on delay. 3.
7. Repeat steps 2 to 6 until the desired time delay is achieved. TIME DELAY ADJUSTMENT 8. Re-install the U7602 controller module housing, if not done in a previous step. Ensure that the housing is tightened with the O-ring fully seated to maintain the watertight and explosion-proof integrity of the detector. 9. Turn on all extinguishing equipment that is connected to the system. MOUNTING SCREWS MAINTENANCE MOUNTING SLOTS A1505 The U7602 requires no periodic calibration.
A coating of lubricant should also be applied to the threads on the detector enclosure before re-assembling the detector housing. This will both lubricate the threads and help to prevent moisture from entering the detector housing. Do not use silicon based lubricant. Lubricant is available from Det-Tronics. 1. Perform the “System Startup/oi Test” procedure. If the detector remains inoperative: a. Remove input power to the U7602. b. Remove detector housing and detector module. TROUBLESHOOTING c.
Table 3—Troubleshooting Guide Operating Mode Fire Relay Fault Relay LED (if equipped) Current Output (standard) 4 to 20 ma Output (if equipped) Normal open closed on 40 microamps 4 milliamperes Reason and Corrective Action: U7602 was not reset after fire or fault condition, oi test, or background radiation detected and problem corrected.
CUT HERE REMOVE WIRE Figure 20—White Wire at the Third Circuit Board Figure 21—White Wire at the Fourth Circuit Board Detector Electronics Corporation 3000 Wilcrest Suite 145 Houston, Texas 77042 USA Telephone (713) 782-2172 Facsimile (713) 782-4287 DEVICE REPAIR AND RETURN Prior to returning devices or components, contact the nearest local Detector Electronics office so that an RMI (Return Material Identification) number can be assigned.
Det-Tronics Deutschland Deugra GmbH Postfach 1457 Harkortstrasse 3 D-4030 Ratingen 1 GERMANY Telephone 49 2102 4050 Direct 49 2102 405152 Facsimile 49 2102 405109 Telex 8589029 Detector do Brasil Avenida Geremario Dantas 493 Rio de Janeiro 22740-011 BRAZIL Telephone (55) 21 392 9633 Facsimile (55) 21 392 5568 Detector Electronics Southern Europe Ciodue – FSI V.
RECOMMENDED SPARE PARTS Description Qty. Controller module See part number on module. 1 per 10 units DE1888 Detector module (See letter designator on module) 1 per 10 units Snap-in oi ring 1 per 10 units UV window cleaner (6 bottle pack) 1 per 10 units Grease for O-rings (1 oz.
