Nexa MTG-3000H - User Manual

OWNERS
MANUAL
12VDC POWERED
GAS LEAKAGE ALARM
(HOT WIRE TYPE)
EN 50194
MODEL : MTG-3000H
IMPORTANT! PLEASE READ CAREFULLY AND SAVE.
This owner’s manual contains important information on the
correct installation and operation of your gas leakage alarm.
Read this manual fully before attempting installation and retain
for future reference.
PRODUCTION DESCRIPTION
The MTG-3000 Gas Alarm is intended to detect leakage of natural gas, town gas and
bottled gas. It is intended for installation in private homes, caravans and boats. The alarm is
connected to a power source of 12V DC when used in caravans or boats, and connected to
the mains through an external transformer 230V AC/12V DC when used in houses. The
alarm is supplied complete with mounting brackets, screws, rawplugs and with a
transformer with 2m connection cable.
MAIN FEATURES
• Hot Wire Type Sensor
• Easy installation and maintenance
• Sensor self diagnostics on the electronic circuit
• Modernized design
• Detect all sorts of combustible gases, LPG and LNG including city gas
• Ideal for all kitchens
• Excellent reliability & high stability
• Self test function
• Durable sensor head
• Less affected by other organic solvent
• High Accuracy
• Loud sound signal of 85 dB at alarm mode
• Three-year limited warranty
• Accessory: Car plug (Optional).
SPECIFICATION
Power Source : DC12V+/-5%
Transformer : Connected to AC230V, 50Hz, 9W, 12V DC 300mA
Sensitivity : Corresponds to a concentration of 6% of the relevant lower
explosive limit
Propane 0.11%
Butane 0.09%
Methane 0.25%
Power Consumption : 1.5W (In Alarm)
1W (Standby)
Operation Temperature : -10
o
C-40
o
C
Current : max. 110mA
Ambient Humidity : max 95%
Dimension : 75 x 75 x 35 mm
Horn Level : 85 Decibels at 3 metres
Standby Mode : Green LED ON
Alarm Mode : Red LED flashes and an acoustic alarm
Fault Mode : Yellow LED ON
Type Of Gas Sensed : Natural gas, Methane, town gas, LPG (e.g. Butane, Propane)
SUBSTANCES TO BE AVOIDED
• Do not cover the alarm with any object. This could diminish the performance of the sensor.
• Make sure that the alarm does not come into contact with moisture.
• Protect the alarm from strong magnetic or electric fields, or heavy mechanical strain and shocks.
LOCATING THE GAS ALARM
The MTG-3000H Gas Leakage Alarm is intended for indoor use in dry rooms where gas leakage might happen. It is
important that the alarm signal can be easily heard in case of gas leakage.
For detecting natural gas, the alarm should be installed 15-30 cm below the ceiling and the maximum distance away
from the furnace or gas appliances is 6 metres. Make sure that the mains socket for connection of the 12V DC mains
adapter is located max. 2m away from the installation position of the gas alarm. For detecting LPG, the alarm
should be installed 15-30 cm above the floor and the maximum distance away from the furnace or gas
appliances is 4 metres.
The recommended areas are kitchen, garage or recreational vehicle.
GAS ALARM
Model: MTG-3000H USER’S GUIDE
Areas to be avoided include the following:-
• Situations where the temperature may fall below -10
o
C or rise above 40
o
C
• Do not locate Gas Leakage Alarm in turbulent air from fans, doors, windows, etc.
• Humid areas such as bathrooms, shower rooms where the relative humidity may exceed 95%
• Outside buildings, e.g. to guard open crates of bottled gas.
• Enclosed areas (e.g. in cupboards or behind curtains), which could prevent the alarm from responding
in the event of a gas leak.
• Areas in which dust or dirt can clog the sensor.
• Directly next to an oven, washbasin or drain.

Summary

Main Features and Specifications

Main Features

Lists key features of the Hot Wire Type Gas Leakage Alarm including sensor type, ease of installation, self-diagnostics, and gas detection capabilities.

Specifications

Details the technical specifications of the gas alarm, including power source, sensitivity, power consumption, operating conditions, and gas types detected.

Gas Alarm User Guide: Installation and Location

How to Install

Provides instructions on how to install the gas alarm, covering mounting, wiring, and initial connection procedures.

Recommended Installation Location

Guides on where to install the gas alarm for detecting natural gas (LNG) and liquefied petroleum gas (LPG) based on ceiling or floor proximity.

Areas to Avoid for Installation

Lists locations to avoid for installing the gas alarm to ensure optimal performance and prevent false alarms.

Gas Alarm Operation and Testing

Installing the Gas Alarm

Detailed steps for electrical installation, mounting bracket attachment, and connecting the power source to the gas alarm.

Operating the Gas Alarm

Explains the initial setup, indicator lights (green, red, yellow), and normal operation modes of the gas alarm unit.

Testing the Gas Leakage Alarm

Recommends weekly testing of the gas alarm using a gas source to ensure correct functionality and alarm response.

When Alarm Occurred

Provides immediate actions to take when the alarm sounds, including extinguishing flames and ventilating the area.

Important Safeguards and Warranty

Important Safeguards

Highlights essential safety practices for gas alarm installation and maintenance, including regular testing and avoiding electrical overloads.

Fault Lamp Indicators

Explains the meaning of the fault lamp and potential causes, such as ambient temperature issues or internal device problems.

Limited Warranty

Outlines the three-year limited warranty for defects in materials and workmanship under normal use.

Nexa MTG-3000H Specifications

General

Alarm decibels	85 dB
Interconnectable	-
Detected gas types	Carbon dioxide (CO2), LPG, Methane, Natural gas
Mounting type	Wall
Product color	White
LED indicators	Alarm, Power
Operating temperature (T-T)	-10 - 40 °C
Operating relative humidity (H-H)	0 - 95 %
Quantity per pack	1 pc(s)
AC adapter included	Yes
AC input voltage	230 V
DC input voltage	12 V
Power source type	AC

Weight and Dimensions

Width	75 mm
Height	35 mm