Sierra Monitor Corporation 1991 Tarob Court, Milpitas, CA 95035 (408) 262-6611 (800) 727-4377 VAULT GAS MONITOR Model 2400-01 Model 2400-21 SMOKE DETECTOR OPTION MODEL 2404-00 APPLICABILITY & EFFECTIVITY This manual provides instructions for the following Sierra Monitor products: Model 2400-01 2400-21 2404-00 Description Vault Gas Monitor Vault Gas Monitor, Low CO Smoke Detector for 2400 The instructions are effective for the above models as of October 1, 1996 Instruction Manual Part Number: T10007 Rev
Instruction Manual TABLE OF CONTENTS PAGE SECTION 1. PRODUCT DESCRIPTION 1.1 Introduction 1.2 General Description 1.2.1. Mechanical 1.2.2. Uninterrupted Power Supply 1.2.3. Alarm Relays 1.2.4. Alarm Indicators 1.2.5. Test Switches 1 1 1 1 1 2 2 2 2. INSTALLATION 2.1 Unpacking and Inspection 2.2 Installation & Set-Up 2.2.1. Enclosure Mounting 2.2.2. External Connections 2.2.3. Start-Up 3 3 3 3 3 3 3. OPERATION 3.1 Status Indication 3.2 Function Tests 4 4 4 4. CALIBRATION 4.
Instruction Manual 1. PRODUCT DESCRIPTION 1.1 INTRODUCTION The Model 2400 series Vault Gas Monitors provide continuous monitoring of Methane (and other Combustibles) and Carbon Monoxide gas simultaneously in a confined space to provide safety for personnel and to reduce the hazard of gas explosion. Two versions of the Model 2400 are available. The 2400-01 has a Carbon Monoxide sensor with a range of 50-200 ppm CO.
Instruction Manual supply includes a built-in constant current Ni-Cad battery charger with up to one ampere capacity. Batteries can be fully charged in 14 hours. The six "D" size NiCad pack batteries will provide up to nine hours back-up. A 5 volt 0.5 Amp regulator supplies power to the analog and digital sections. The battery voltage is constantly monitored and if it fails, a low battery voltage signal is generated. The UPS and DC electronics are electronically protected against short circuits. 1.2.3.
Instruction Manual 2. INSTALLATION 2.1 UNPACKING AND INSPECTION Remove the instrument from its packing container and inspect to insure that all items listed on the packing slip have been received in good condition. Open the door by loosening the two screw clamps. Inspect the internal electronics and wire harnessing to insure that no damage has occurred during shipment.
Instruction Manual 3. OPERATION INSTRUCTIONS The Model 2400 requires no operator intervention except for periodic calibration. The following information can be followed to insure that the initial installation is correct and to insure that the external wiring is correct. FUNCTION TEST: Apply gas from a cigarette lighter (WITHOUT FLAME) or other high concentration source to the CH4 sensor and check that the Combustible Alarm light goes on. 3.
Instruction Manual 4. CALIBRATION INSTRUCTIONS 4.1 FREQUENCY OF CALIBRATION The manufacturer recommends that the Model 2400 be calibrated every 180 days. 4.2 PROCEDURE PREPARATION: Open the door of the enclosure and locate the two adjusting potentiometers which are immediately above the connectors for the two gas sensors. Adjustment of these potentiometers raises and lowers the sensitivity of the respective gas sensor. Also locate the two LED indicators near the respective potentiometers.
Instruction Manual 5. INFORMATION TO INSTALLERS Adjust the voltage using the potentiometer R35 at the lower left corner of the board. 5.1 DISCUSSION & BACKGROUND Field data shows that the Vault Gas Monitor operates extremely well in the installed vault. This is because the environmental conditions and the monitor are stable. 4.
Instruction Manual increase above the TP5 value and the gas alarm occurs. Page: 7 5.5 If 5000 ppm methane gas is available perform step 4 test using the calibration. Note that the change in voltage is much less dramatic. 5.6 It should now be clear that TP6 should be adjusted above "0" to avoid false "sensor fail" alarms and sufficiently below TP5 so that the change due to calibration gas causes TP6 to go higher than TP5 and sets off the alarm. 5.
Instruction Manual 6. SMOKE DETECTOR 6.3 OPERATION 6.1 PRODUCT DESCRIPTION The Model 2404 (Figure 3) is a photoelectric, single station Smoke Detector which is designed to be operated in conjunction with the Sierra Monitor Model 2400 Vault Gas Monitor. The Smoke Detector contains the detection electronics, an audible alarm, D.C. power supply and dry contact relay connections. Power to operate the Model 2404 is provided by the regulated DC power supply installed in the Model 2400.
Instruction Manual 7. NICKEL CADMIUM BATTERIES 7.1 NICKEL OPERATION CADMIUM BATTERY The best maintenance objective is to: Nickel cadmium batteries such as those used in the Model 2400 Vault Gas Monitor are intended for use in applications where the power demand will be constant over a long (hours) period of time (as opposed to a vehicle battery which is designed for surge demand). - Preserve the batteries with maximum charge for as many years as possible.
Instruction Manual 8.
Instruction Manual 9. PART NUMBERS & SPARE PARTS LIST CALIBRATION ACCESSORIES Description Model No. 1200-26 Gas Sensor Calibrator W/2 gas cylinders 1290-03 Gas Cylinder - Methane 5000 ppm 1290-05 Gas Cylinder - Carbon Monoxide 100 ppm 1290-08 Gas Cylinder - Carbon Monoxide 25 ppm MODEL 2400 SERIES ASSEMBLIES Description Model No.
Instruction Manual Page: 12 Model 2400 Vault Gas Monitor 2/03
Page: 13 MATING CONNECTOR IS AMPHENOL P/N 97-3106A-24-285 MATING CONNECTOR IS AMPHENOL P/N 97-3106A-14S-75 RELAY CONNECTION 1/2 AMP FUSE A.C. INPUT 4.25 (10.8cm) REPLACEABLE CARBON MONIXIDE (LOW ppm) SENSOR ASSEMBLY .312 DIA. (4X) MOUNTING HOLE 8.25 (21.0 cm) LED (8X) THERMISTOR ASSEMBLY SAFE 8.75 (22.
Page: 14 6.1" 1.85" BOTTOM VIEW MODEL 2404-00 SMOKE DETECTOR Milpitas, C A 95035 Sierra monitor corporation SEE DETAIL A TO OPEN - PRESS SCREWDRIVER BLADE HERE Model 2400 Vault Gas Monitor 2/03 DETAIL A SIDE VIEW TERMINAL BLOCK BLUE +5V (BY CUSTOMER) GND (BY CUSTOMER) BLACK 1 2 YELLOW N/O (BY CUSTOMER) COM (BY CUSTOMER) COVER RELEASE 4 3 MOUNTING ALL BOXES SCALE: DATE: MN SHEET FIGURE 3 10/3/95 DWG NO. SMOKE DETECTOR K2404A.
Instruction Manual Page: 15 Model 2400 Vault Gas Monitor 2/03
Instruction Manual Page: 16 Model 2400 Vault Gas Monitor 2/03
Instruction Manual Page: 17 Model 2400 Vault Gas Monitor 2/03
Instruction Manual 1 +5 VDC 2 GND 4 3 M2404-00 SMOKE DETECTOR TERMINAL STRIP N +5VDC P COMMON (GND) Q R S M2400-XX GAS MONITOR AMPHENOL CONNECTOR T U V W B C 59 60 A B J5-13 J5-12 TROUBLE TB3 TB3 K19 COIL CEV LOGIC PANEL TB1 ELECTRICAL CONNECTIONS MODELS 2400-1 & 2404 FILE NO: DWG NO. FIGURE 6 M24001A.CDR SCALE: N/A DATE: 6/28/95 MN SHEET Page: 18 REV.