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initial repair should be limited to the exchange of modules and verification of proper wiring of all incoming field connections. 4.2 Annunciator Module Troubleshooting of the annunciator module should be carried out systematically, since this module operates in conjunction with the X53-2000 Field Isolator and the intrinsically safe 24 VDC power supply. In the event of a malfunction of this module, check field wiring to the input terminal connector of the X53-2000 Field Isolator (schematic X76-2001). Check fuse in the power supply and measure with a DC voltmeter the voltage across the output of the power supply, confirming 21.6 to 30 VDC. Replace the X53-2000 Field Isolator module. If this does not solve the problem, the cause is in the annunciator module, which will have to be replaced. The Ronan Series X76S Leak Detector Monitor is a four -point annunciator system of general-purpose design equipped with certified, intrinsically safe barriers to interface with field contacts that are located within a hazardous area as described in section 1.0. The field contact, when transferring from normally open or normally closed to its off -normal state, will be visually indicated via the light -emitting diode and the audible buzzer will sound. The front - panel -mounted pushbutton allows the operator to acknowledge the alarm, thereby changing the flashing LED to steady -on and silencing the audible alarm. The test pushbutton, if pressed, will actuate all alarm points to verify proper operation of the logic and the LEDs. The Model X76S, used as a leak detector, monitors liquid levels in secondary underground tanks and/or ground wells. The system finds applications in gasoline and oil storage facilities to detect these leaks in time to prevent leakage or seepage of hazardous liquid into the underground water table. The secondary containment tank leak monitor consists of liquid -level sensors and alarm annunciator modules, located in the Ronan X76S system. The liquid -level sensor monitors the area between the inner and outer tank for possible spillage. Should a leak occur, the product will be contained in the outer shell and the X76S alarm annunciator module will indicate an alarm via the system's buzzer and flashing LED, specifying which tank has a leak. The X76S will also indicate an alarm should the outer shell leak and allow ground water to seep into the tank. 7.0 SPECIFICATIONS 7.1 System, Model X76S Power: 115 VAC, 60HZ Power Consumption: 100 VA Operating Temperature: 32 to 165°F (0 to 75°C) Dimensions: 9 x 9.5 x 4.2 inches (22.86 x 24.13 x 10.67 cm) Mounting: General purpose area; wail mount -<FM> Approved: File J.I. 2N4A1.AX 7.2 Annunciator Module Field Sensor: Dry contact Field Sensor Voltage: 115 VAC (supplied by X76S) Number of inputs: One per module -e> Approved: File J.I. 2N4A1.AX 7.3 Intrinsically Safe Field Sensor Interface Module X53 Number of Inputs: Two per module Sensors Voltage: 24 VDC, current limited Sensors: Dry contact Output Interface to Alarm Module: Relay contact; normally open/normally closed; selectable Power Consumption: 750 mW per input Supply Voltage: 24 VDC from IS power supply FM Approved: File J.I. 2N4A1.AX 7.4 Power Supply IS (Intrinsically Safe) Power Input: 115 VAC Output Voltage: 24 VDC FM Approved: File J.I. 2N4A1.AX 7.5 Vapor Sensor, Model HV Detection Method: Solid-state diffusion type Detectable Gases: Hydrocarbons, gasoline, solvents, carbon monoxide, methane, ammonia, sulfur dioxide, hydrogen sulfide Detectable Range: 0-100% LEL Accuracy: ±5% Response Time: Less than 15 sec to 90% full scale Sensitivity: 5 ppm