UVU-140A AND UVU-140-AR UNITIZED ULTRAVIOLET FIRE DETECTOR USER MANUAL Part Number: MAN-0002-00 Rev.
Copyright © 2001 Net Safety Monitoring INC. Printed in Canada This manual is provided for informational purposes only. Although the information contained in this manual is believed to be accurate, it could include technical inaccuracies or typographical errors. Changes are, therefore, periodically made to the information within this document and incorporated without notice into subsequent revisions of the manual. Net Safety Monitoring INC.
TABLE of CONTENTS CHAPTER 1 TECHNICAL INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Spectral Sensitivity Range . . . . . . . . . . . . . . . . . . . . Figure 1 - Various Spectral Distributions Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Applications . . . . . . . . . . . . . . . .
Appendix A Net Safety Monitoring Inc. Electrostatic Sensitive Device Handling Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Appendix B Common Ultra-Violet Absorbing Gases . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Appendix C Wire Resistance In Ohms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CHAPTER 1 TECHNICAL INFORMATION Introduction The UVU-140-A & UVU-140-AR fire detectors provide fast, reliable flame detection in a wide variety of applications. The automatic visual integrity (vi) feature allows for a continuous check of optical surfaces, sensitivity and electronic circuitry of the unitized fire detector. Fire and fault identification are accomplished by the use of specific current output levels and relay contacts (UVU-140-AR only).
Specifications 2 < Operating Voltage Range: 24Vdc nominal: 10.5 to 32Vdc If a fuse is rated in line with the main power supply, it should be a 1A slow-blow type. If a power supply with current limiting is used it should have a rating appropriate for the inrush current required by the product. < Power Consumption (UVU-140-A): 1.92 Watts nominal 2.4 Watts maximum @ 24Vdc 80mA nominal 100mA maximum @ 24Vdc Inrush Current 250 mA for 2.5 ms < Power Consumption (UVU-140-AR): 2.
1A @ 30Vdc 0.5A @ 125Vac < Response Time: Response to a saturating (high intensity) UV source is typically 10 milliseconds Alarm response time is programmable < Time Delay Settings: DIP switch selectable 3, 4, 5 or 7 seconds < Sensitivity Settings: DIP switch selectable 8, 16, 24 or 32 counts per second < Humidity Range: 0 to 100% relative humidity Applications The UVU-140-A & UVU-140-AR fire detectors respond instantly to ultraviolet radiation emitted by a flame.
Figure 2 - Detector cone of vision CHAPTER 2 INSTALLATION What’s in the package Remove all the components from the packing box(s) carefully; check components against the packing list. Inspect all components for obvious damage and broken/loose parts. Notify the carrier and distributor immediately if damage is found or parts are missing. Mounting the Detector There are many factors that you should be aware of when positioning your fire detector(s).
between the detector and the sources of potential fires. Small concentrations of these types of gases may not absorb enough UV radiation to cause a problem, but when higher concentrations of these gases are present the detectors may become blind as not enough ultra-violet radiation can reach them to activate an alarm. Moving detectors closer to the probable source of fire and increasing the sensitivity of the detector can help to overcome this problem in some cases.
metre) below the ceiling where they may respond before being obscured by smoke. Consider shortening time delay settings when smoke is expected to accumulate during a fire. If dense smoke is likely to accumulate prior to flame (as in an electrical fire), supplement UV detectors with other protection. The detector should be mounted in a low vibration area be easy to access for cleaning purposes and should not have glass or plexiglass windows between the device and the potential fire.
Figure 4 - D etector D im ensions Figure 5 - Swivel Mount Dimensions Figure 6 - JB 4-U V -T Junction B ox Side Figure 7 - JB 4-U V -T Junction B ox V iew Top V iew 7
General Wiring Requirements NOTE: The wiring procedures in this manual are intended to ensure proper functioning of the device under normal conditions. However, due to 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.
Wiring Diagram for UVU-140-A Figure 8 - W iring for UV U -140-A 9
Wiring Diagram for UVU-140-AR NOTE: common” ) - 24Vdc not used“system connect it to (- If the 4-20 mA signal is Figure 9 - W iring for U VU -140-A R 10
Detector Settings System Sensitivity The UV tube count rate generated by different fires at the same distance is unpredictable. Generally if a fire doubles in size, the tube response is increased by about 60 percent. The UVU-140-A & UVU-140-AR detectors have selectable sensitivity settings which allow for various applications regardless of the severity of the hazard and the action required if a fire occurs.
Table 3 - Coil and Relay Status COIL AND RELAY SETTINGS TABLE Switch 1 Switch 2 De-energized and non-latching ON ON Energized and nonlatching ON OFF De-energized and latching OFF ON Energized and latching OFF OFF CHAPTER 3 START UP AND TEST Start up Procedure NOTE: Be sure that the detector is correctly aimed at the potential hazard and that no obstructions interfere with its line of vision. UV absorbing gases should not exist between the detector and the potential hazard.
Manual vi Test Procedure The detector has a manual vi input. The manual vi test is performed by connecting this input to the system power for the duration of the test. This can be done by connecting a momentary contact pushbutton between system power and the manual vi input, and then holding the pushbutton to perform the test. NOTE: The manual vi feature is optional on the UVU-140-A (If not used, leave unconnected or tied to system common).
The UVU-140-A or UVU-140-AR current output will change with the amount of ultraviolet light being detected (see Table 4). 2. Turn off the UV test lamp. 3. Repeat steps 1 & 2 for all detectors in the system. 4. After all detectors have been checked, return the system to the normal operating mode. 5. Restore power to output loads or remove any mechanical blocking devices. CHAPTER 4 NORMAL OPERATION Normal Operation In normal operation the detector outputs 4mA.
CHAPTER 5 MAINTENANCE Routine Maintenance The UVU-140-A & UVU-140-AR fire detectors require no periodic calibration. To maintain maximum sensitivity, the viewing window and reflector should be cleaned on a routine basis depending on the type and amount of contaminants in the area. The rubber o-ring on the detector housing is used to ensure the detector is watertight. The housing should be opened periodically and the o-ring inspected for breaks, cracks or dryness.
Device Repair and Return The UVU-140-A and UVU-140-AR fire detectors are not designed to be repaired by the customer in the field. If a problem should develop, first carefully check for proper wiring and programming. If it is determined that the problem is caused by an electrical malfunction, the unit must be returned to the factory for repair. Net Safety Monitoring Inc. encourages its distributors to make advance replacement units available to the user during the warranty period.
Appendix A Net Safety Monitoring Inc. Electrostatic Sensitive Device Handling Procedure 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.
Appendix B Common Ultra-Violet Absorbing Gases Since the UVU -140-A & UVU-140-AR fire detectors are designed to detect fires by responding to the ultra-violet (UV) radiation they emit, it is very important to be aware of UV absorbing gases that may be present between the detector and the sources of potential fires.
Appendix C Wire Resistance In Ohms Distance (Feet) AW G #20 AW G #18 AW G #16 AW G #14 AW G #12 AW G #10 AW G #8 100 1.02 0.64 0.40 0.25 0.16 0.10 0.06 200 2.03 1.28 0.08 0.51 0.32 0.20 0.13 300 3.05 1.92 1.20 0.76 0.48 0.30 0.19 400 4.06 2.55 1.61 1.01 0.64 0.40 0.25 500 5.08 3.20 2.01 1.26 0.79 0.50 0.31 600 6.09 3.83 2.41 1.52 0.95 0.60 0.38 700 7.11 4.47 2.81 1.77 1.11 0.70 0.44 800 8.12 5.11 3.21 2.02 1.27 0.80 0.50 900 9.14 5.
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