Sierra Monitor SMC 2400 Vault Gas Monitor Spec Sheet
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Model 2400
Vault Gas Monitor
The Model 2400 Vault Gas Monitor is a continuous Combustible Gas and Carbon Monoxide monitor for personnel and facility safety in confined spaces.
The Model 2400 is ideal for continuously monitoring both
Combustible Gas (Methane) and Carbon Monoxide in confined spaces such as utility vaults to reduce the hazard of gas explosion and to maintain personnel safety. Each model offers the full performance features you desire including uninterrupted power supply, longlife sensors five alarm relays, and both audible and visual alarm indication.
The Vault Gas Monitor is housed in a NEMA-3 hinged enclosure with the input power connector, relay output connector, fuse, and sensor housings accessible externally.
The sensors are mounted in anodized aluminum protective housings and the solid state sensors are protected by 60 micron flame arrestors. The sensors are isolated from the main electronics enclosure to provide EMI/RFI isolation.
Reliable Uninterrupted Power Supply
Sensors
The Model 2400 has the sensors mounted on the bottom of the enclosure. This configuration provides protection from dust and moisture contamination. The sensors can easily be replaced without removal of the monitor from its permanent mounting Two of these sensors are for gas detection and the third contains two separate thermocouple devices to permit direct measurement of ambient temperature.
An EMI/RFI Line Filter is provided to filter the AC power line from high frequency noise. The power supply includes a built-in constant current NiCad battery charger with over 1 amp capacity. The six “D” size NiCad batteries can be fully charged in less than 14 hours and will provide up to nine hours back-up power.
Alarm Relays
There are five alarm relays on the Model 2400. All are
SPDT with 6 Amp dry non-inductive contacts.
Methane Sensor: Detects methane and other explosive gases. The calibration range is between 5% and
25% of LEL for Methane. The sensor is relatively insensitive to CO. The Methane sensor is a metal-oxide semiconductor-type solid-state device for long life.
•
Failure Relay: Activated when either gas sensor becomes defective or if both the AC and battery back-up power supplies fail.
Carbon Monoxide (CO) Sensor: The wide range CO sensor on the Model 2400-01 has a range of 50-200 ppm.
This sensor is a metal-oxide semiconductor-type solidstate device for long life. The low range CO sensor on the Model 2400-21 has a 0-100 ppm range to meet current OSHA and NIOSH safety regulations. This low range
CO sensor is a long life electrochemical sensor.
Temperature Sensor: Each sensor is compensated for variations of ambient temperature over a range of 0 to
40 o C.
•
Carbon Monoxide Relay: Activated when concentration of CO exceeds the calibrated threshold setting (100 ppm for the 2400-01 or 35 ppm for the
2400-21).
•
Combustible Gas Relay: Activated when the concentration of Methane exceeds the calibrated threshold setting (factory set at 5000 ppm CH
4
).
•
Ventilation Relay: Activated when either the CO or CH
4 levels.
gas concentration exceed their calibration
Sierra Monitor Corp. 1991 Tarob Court Milpitas, CA 95035 USA (408) 262-6611 (800) 727-4377 FAX: (408) 262-9042
Model 2400 Vault Gas Monitor
•
Remote Indicator Relay: Activated when the
Failure Relay or the Ventilation Relay is activated.
The following conditions will activate the Remote
Indictor Relay which is normally connected to a
Remote Indicator box: excess CO or excess
Methane, AC and Battery failure, CO or Methane sensor failure.
Power Indicators consists of a Power-ON Lamp (green) and Low Battery Indicator (red).
The Combustible Gas (Methane) and CO sensor circuits have three status lights each for Safe (green), Alarm
(red) and Sensor Failure (red).
Test Lamps Button
Alarm Indicators
The front panel has one audible alarm, eight annunciator lights and one test button.
A momentary push button is provided for testing the operation of all lamps, the ventilation, Methane, and CO relays and the audio alarm. The relays can be disabled during calibration or for maintenance testing.
The Audio Alarm will sound a continuous tone of 68 dB at 2900 Hz when either the CO or Methane gas concentration exceed their calibrated threshold levels. The alarm points can be varied individually on both the Methane gas and Carbon Monoxide sensors.
SPECIFICATIONS
INPUT POWER: 120 Volt/60 Hz or 240 Volt/50 Hz
12 Watts Maximum
ALARM CALIBRATION RANGE
Combustible Gas: 2500-12,500 ppm Methane
(5%-25% LEL)
Carbon Monoxide: 50-200 ppm (2400-01)
0 - 100 ppm (2400-21)
FACTORY ALARM CALIBRATION:
Combustible Gas:
Carbon Monoxide:
5000 ppm Methane
100 ppm (2400-01)
35 ppm (2400-21)
RESPONSE TIME: Less than 30 seconds
OPERATING TEMPERATURE RANGE:
Standard 32 to 104 o F (0 to 40 o C)
Extended Temperature Option: -4 to 140 o F (-20 to 60 o C)
INPUT CONNECTOR: 3 pin (Amphenol) Mil-Spec Type MS
3106A-14S-7S
OUTPUT CONNECTOR: 24 pin (Amphenol) Mil-Spec Type
MS 3106A-2428S
BATTERIES: 6 “D” Size NiCad Pack - 4 Amp hour
(9 hours of life at 25 o C)
OUTPUT RELAY RATING: Five SPDT (Form C), 6 Amp noninducting at 120/240 VAC
6 Amp non-inducting at 28 VDC,
1/8 HP Load at 120 VAC,
170 W or 1800 VA
GAS SENSORS:
2400-01
2400-21
Two solid-state metal-oxide semiconductor sensors in separate housings.
One solid-state metal-oxide semiconductor sensor (Methane) and one electrochemical sensor in separate housings.
TEMPERATURE SENSOR: Two solid-state thermistors
AUDIBLE ALARM: 68 dB at 2900 Hz
ENCLOSURE:
FUSE:
SIZE:
WEIGHT:
NEMA-12 hinged front panel with mounting flanges
1/4 Amp 250 VAC
8.7 X 8.2 X 4.2 inches
(22.2 X 21.0 X 10.8 cm)
12 lb. (26 Kg)
ORDERING INFORMATION
2400-01 Combustible & Carbon
Monoxide Monitor
2400-21 Combustible & Carbon
Monoxide Monitor,
Low CO
2401-00 Remote Alarm Indicator for 2400-XX
2404-00 Smoke Detector for
2400-XX
Sierra Monitor Corporation 1991 Tarob Ct. Milpitas, CA 95035 (408) 262-6611 800-727-4377 FAX: (408) 262-9042
Visit our Web site at: www.sierramonitor.com E-Mail: [email protected]
© 1997 by Sierra Monitor Corporation Printed in U.S.A.

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