LSGJG-M14 optical fiber multi-channel methane detector modul

First, an overview

LSGJG-M14 optical fiber multi-channel methane detector module is a new generation of methane detection instrument developed by our company. It uses advanced narrow band spectral absorption technology to transmit and measure through optical signal. It has advantages of low power consumption, high precision, fast response, no need to adjust, stable performance, long life and far distance of signal transmission. . It is suitable for monitoring methane gas or combustible gas in cable tunnel, City pipe corridor, coal mine roadway and other environments.

Two, functional characteristics

Fast response: response time is less than 7S;

Anti-interference: Narrow-band laser is used, which has unique selectivity to methane gas and is not disturbed by other gases.

Intelligent: it has the function of self diagnosis;

Long life: 5 years

Multichannel: simultaneous detection of 14 different positions of methane gas (expandable module);

Three, shape structure and working principle

3.1 shape structure

1. Instrument (164x108x47mm)

2, probe (phi 46x103mm)

3.2 working principle

The equipment makes use of the characteristic that the medium absorbs light and causes attenuation of light to make absorption optical fiber methane detection equipment. The system uses absorption peak at 1.653um to detect methane concentration. When working, the light emitted by the light source of the instrument is transmitted to the field fiber optic methane probe. When there is methane gas, the light intensity changes after the absorption of the methane conversion probe. After the same transmission optical cable is sent back to the demodulator of the device to demodulate, the methane concentration in the field is determined by detecting the change of the intensity of light.

Four. The main technical parameters

Parameter description                            Company                                            Technical indicators              

Detecting gas                                             NA                                                           methane

Sampling method                                       NA                                                         Optical fiber

Sensor type                                                NA                                                Laser spectral absorption

range                                                          %                                                                0-100

accuracy                                                      %                                                            (0-1 hours)                            + 0.05%

                                                                   %                                                           (1-100 hours)         The true value is + 5%

work environment                                Centigrade                                          ambient temperature                            0-40

                                                                    %                                                     relative humidity                         Less than 98

                                                                   KPa                                               Environmental pressure                       80-116

                                                                   M/s                                                       wind speed                             Less than 8

response time                                                S                                                              Seven

Number of channels                                    NA                                                         14 (extensible)

Detection distance                                       Km                                                                One

dynamic range                                             DB                                                                 Ten

Working temperature range                    Centigrade                                                        0 - 40

Power supply voltage                                   AC                                              220 + 10%V (module DC5V)

Communication mode                                  NA                                                              RS485

Communication protocol                              NA                                                     Standard protocol

Mechanical size                                            Mm                                                         164 (108) 47

Five. Instructions for use

Module sensor connection diagram

Instrument sensor connection diagram

1. Optical fiber multi-channel methane detector can communicate with monitoring host through network cable and RS485.

2. The fiber optic methane sensor is connected with the single mode fiber in the multi core optical cable through the optical fiber cable connecting box, and the methane monitoring signal is transmitted to the LSGJG-M14 fiber multi channel methane detector.

The L type support is fixed to the side wall of the cable tunnel through the expansion screw, and the methane sensor is fixed on the support with nut, in which the distance between the sensor and the side wall is 375px, and the distance is 750px from the top of the tunnel.

A schematic diagram for the installation of optical fiber methane sensors

3. Communication protocol

The module communication adopts the standard Modbus protocol.

Six, maintenance and maintenance

1. When the sensor is in normal use, it needs 6 months to check the standard gas. During the ventilation period, the monitoring software was monitored by the host computer, and the ventilation time was no less than three minutes. If there is any error in the measurement data, it can be adjusted by coefficient calibration without re calibration.

2. During normal operation, we should regularly remove the Mariners at the vent of the sensor probe shell to ensure that the ambient gas enters the sensor probe.

3, if there is an unresolved problem, please contact the manufacturer and not disassemble the sensor probe without authorization.

Seven, storage and transportation

In the process of transportation, the instrument is not allowed to be subjected to severe mechanical impact and exposure to rain, and can not be inverted, thrown, rolled or stressed.

Products should be stored in a dry, clean, well ventilated, non corrosive medium with ambient temperature of -40 to + 60 degrees, and should be kept away from fire sources and heat sources.

Eight, open the box and check

Check the packing list, check the packing box and the items, information (quantity, specification, certificate, and accessories). The appearance of the product should be perfect and the mark is complete.

The following accessories and documents should be included in the packing box:

SZGJG-M14 optical fiber multi-channel methane detector (1 sets) / probe (14); calibrated gas nozzle (1);

Powder metallurgy spare parts (1); factory inspection report (1 copies);