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field isolator and the 24 VDC power supply. In the event of a malfunction of this module, check field wiring to the input terminal connector of the X53 field isolator (schematic X76D32). Check fuse in the power supply and measure with a DC voltmeter the voltage across the output of the power supply, confirming 24 VDC±.05 V. Check X53 field isolator output to the annunciator module with an AC voltmeter to see if contacts are being closed or opened by the input sensor contacts. If this is not the problem, check the X53 isolator module (schematic X53-1004). The most likely components to be replaced are Q1, 02 and Q3. Otherwise, the problem lies in the annunciator module (schematic X76-1001). The relay functions should be verified. If problem persists, all relays should be exchanged. If relays are switching and there is not apparent lamp indication, the problem may be an open light bulb requiring replacement. 7.0 ORDERING INFORMATION 7.1 General The TRS -76 Leak Detector System can be configured to meet the different local and state codes for underground storage by proper selection of the sensors and monitor modules. For example, a particular local code and/or type of facility may require leak detection of the product line, dry well, vapor and tank annulus monitoring. With the facility consisting of three tanks and submersible pumps, the monitor system would consist of the following items: MODEL TRS -76 -3 -3S -IHV 1 each dry well vapor monitor 3 each tank leak sensors (specify tank manufacturer) 1 each alarm module 3 each line/leak sensors 3 each dispenser modules 7.2 Order by Model Number MODEL TRS -76 -(A) -(BC) -(DE) A= Number of product lines to be monitored, each consisting of: 1 each JT -1 line sensor 1 each X76DM1000 dispenser module B= Number of tank annuli to be monitored, consisting of: 1 each tank annulus liquid sensor 1 each X76-1001 alarm annunciator module (3 inputs per module) C = Tank manufacturer S = Steel, C = Owens-Corning, X = XERXES D = Number of vapor sensors of multipurpose sensor assemblies required E = Type of sensors HV =vapor sensor for gasoline, waste oil and diesel LHV = liquid sensor and vapor sensor PLHV = product, water and vapor sensor 7.3 Spare Parts Model Number Description JT -1 Line leak sensor LS -3 Steel tank liquid probe LS -7 Fiberglass tank liquid probe LS -10 O.C.F. reservoir system HV Vapor sensor X76 -D2-4 Panel -mount chassis, four modules X76 -D2-8 Panel -mount chassis, eight modules X76PBM-1001 Pushbutton module X76AM-1001 Annunciator module, three inputs X76DM-1000 Dispenser module X53 -D22-6 Contact isolation chassis with one three -input module X53 -D22-5 Contact isolation chassis with two three -input modules X53 -D22-4 Contact isolation chassis with three three -input modules 115-24-201S Power supply, intrinsically safe .0 RELIABILITY ANALYSIS AND MEAN TIME BEFORE FAILURE 8.1 Scope This reliability analysis quantifies the overall reliability of the Model X76 Alarm/Trip Transmitter system. The calculated failure rate of the dispenser, alarm and pushbutton and horn modules are tabulated below, along with that of the intrinsically safe power supply used to power them. These units are manufactured by Ronan Engineering Company, Woodland Hills, California. The analysis was performed using MIL-HNBK- 217D, Notice 1, dated 13 June 1983. 8.2 Guidelines for Reliability Analysis The environmental conditions of use were assumed to be "ground, benign" with the ambient temperature in the range from 40 to 5