China Lh1500 Online Gas Leakage Analyzer

LH1500 online Gas Leakage Analyzer (hereinafter LH1500) is specially designed instrument to precisely detect the gas leakage. It is widely used in such areas as electric power, steel, petroleum, chemical, shipping, tunnel, etc. to perform online leakage detection of gases( for example, flammable gases like hydrogen, methane). The instrument takes advantage of world leading sensing technology, which can monitor the area simultaneously with multi points in real time. The system consists of one host machine and 8 gas sensitive transmitters, and is flexible control.Structure featuresLH1500 use the split-type design which separates the host machine and the transmitters. The host is placed in the safety zone and the transmitters are placed in dangerous zone where may accrue gas leakage. The protection class reaches IP54. The 8-18 transmitter channel can be arbitrary choice. The host machine consists of signal acquisition, signal conversion, display unit and cabinet, which are easy to install.

Working principle

The signal from the gas sensitive transmitters is converted into digital signal by the high precision A/D converter and displayed on the industrial true color LCD after processed by the embedded CPU. Through the converter and the corresponding circuit, it can realize output of (4~20) mA analog signal, also output of RS485 digital signal . The user can use the panel buttons to operate the instrument.Technical features PerformanceIndustrial true color LCD, high definition display, human-machine interface windows, the drop-down menu.8 lines of (4~20) mA analog transmitter input interface which has the most analog channels in
the same kind product, compatible with 3-wires transmitter and 2-wires transmitter.On the same host machine, every transmitter can be configured individually, monitoring different gas types, ranges and data units.Reserved digital transmitter input interface: 1 line RS485 connecting intelligent device, such as GD6102 gas flow purity analyzer and so on.Output interface: 8 lines (4~20) mA, 8 lines H alarm, 1 line total alarm. Use large capacity flash memory chip to save the historical data, no data losing when power-off,

every minute store a set of data which can be stored for 100 days, user can query data by date.
The platform circuit design, use advanced ARM digital processing technique, high reliability and great anti-interference performance.ParametersWorking conditions Working temperature:(0~50) ºC. Relative Humidity:<90%(25 ºC) . Environment pressure:(86~110) kPa. Non corrosive gas or vapor environment. In no significant shake and shock place. Technical parameter
Technical parameter of LH1500 online gas leakage analyzer
a) Power Supply:(110~240) V AC;(50±2) Hz;≤0.25 A.
Measurement range and Accuracy:

Gas type
Measurement rangeAccuracy
Hydrogen(0.0~4.0)%H2(0.0~2.0)%H2, ±0.2%H2
(>2.0~4.0)%H2,±0.3%H2

Response time: <30 s. Display mode: industrial grade high-definition LCD screen. Analog input: (4~20) mA. Digital input: RS485. Analog output:(4~20) mA, 500Ω of maximum load resistance. Alarm output: H alarm which can be set SPST. Alarm output contact capacity: 250 V AC/5 A; 30 V DC/5 A. Measurement channels: ≤8 lines.

Explosion grade:
Host machine:[Ex ia Ga]C. Transmitter:ExiaC T3 Ga.Outline dimension of host machine:(460x350x130) mm. Weight: Host machine ≤10 kg; Transmitter ≤0.9 kg. Technical parameter of GD6102 gas flow purity analyzer transmitter Measurement range:

ItemModelNameRange
1
GD6102-PGas purity analyzer
transmitter
Purity:(0.0~20.0)%
2
GD6102-HGas flow purity analyzer
transmitterPurity:(0.0~20.0)%Flow:(60~1000) L/h

Purity measurement precision:±2.0%FS(Standard status). Flow measurement precision:±2.0%FS(Standard status) . Power supply:12 V DC. Ex Type:Exd ia C T4 Ga. Pipe size:DN15,(22x3). Sampling pipe material: stainless steel. Cable interface size: (6~10) mm. Outline dimension:(280x150) mm. Weight: about 2 kg per transmitter. InstallationThe connection diagram of LH1500 and the Generator as shown below:

Figure 5.1 the connection diagram of LH1500 and the Generator
Mounting the host machineMounting the host machineRefer to the host bracket dimension in Figure 5.2, fix four M8 expansion screws on the wall next to the generator bus bar, and install the host on the expansion screws, insert Φ8 plain washer and spring washer, and then tighten the M8 nuts to complete the host installation.
Figure 5.2 Host bracket

Note: The installation location need good ventilation and should leave more than 1m space around for operation and maintenance.Wiring the host machineOpen the front cover of LH1500 host to operate the wiring terminals. The following will introduce the function of every terminal.
The host terminals of 8 channels distribute in three fixed plates which includes left board, middle board, right board as shown in Figure 5.3.
Figure 5.3 wiring terminal block plate diagram
Terminal block definition

Terminal fixing plate nameTerminal definitionLeft boardRS485 signal1~8 line transmitter inputMiddle board1~8 line current signal outputRight board1~8 line H alarm and total H alarm signal output

The terminal definition of left board:
The left board is RS485 signal and 1 ~ 8 line transmitter input to connect the transmitter, the labeled "V" indicates the positive power of the transmitter ( 12 V, 300 mA maximum current output), "G" is the negative power of the transmitter, Mark of "S" is for (4~20) mA signal of the transmitter, the labeled "1#" is the first line of the transmitter input interface, "8#" is the eighth line of the transmitter interface, the labeled "RS485" is the transmitter input interface of the Gas purity analyzer.

Figure 5.4 Left board wiring definition

The terminal definition of middle board:
The middle board is (1~8) line current output signal to upload to the DCS. The labeled "IOUT1+" is the first line of positive current output; "GND" is for the negative power output; Mark of "1#" is the first line of current output interface, Mark of "8#" is the eighth line of current output interface.

Figure 5.5 Middle board wiring definition

The terminal definition of right board:
The right board is (1~8) line H alarm and total H alarm signal output to upload to the DCS. The
labeled "1C" is the common terminal of the first line alarm signal; labeled "1NO" is the first line of alarm signal normally open; Mark of "1#" is the first line of H alarm interface of the transmitter, mark of "8#" is the eighth line of H alarm interface of the transmitter, the alarm mode is SPST normally open type, the relay is closed if alarm occurs. Mark of "ALA1" is the total alarm interface; the alarm mode is SPST normally open type, the relay is closed if any route/line of alarm is triggered.

Figure 5.6 Right board wiring definition

Mounting LH1500 transmitter
The transmitter type

According to the performance characteristic and installation location, the transmitter has the following types.

ItemSpecificationPerformance characteristicLocation
1
LH1500-AThe ventilation diffusion window is larger which suitable for hydrogen leakage detection in
space environment
Environmental space
2
LH1500-B
With filter tube bundleSteam side and excitation
side, main oil tank
3
LH1500-CWithout filter tube bundle or hydrogen
sensitive membraneABC enclosed bus bar,
neutral point4LH1500-EWith filter tube bundleWater return pipe

Wiring the transmitterThe output voltage of the host machine is 12 V DC, the host and the transmitter use 3-wire connection, Mark of "V+" is for the positive power of the transmitter, Mark of "V-" is for the negative power of the transmitter,Mark of "S" is for (4~20) mA of the transmitter.
The 3-wire transmitter definition: SIG connects the yellow wire of the transmitter output, GND
connects the green wire of the transmitter output, +12 V connects the red wire of the transmitter output (the transmitter output uses three-core and three colors cable, see the diagram below. The color of the cable refer to the real object.)Figure 5.8 Wiring connections for 3-wire transmitter and host machine
Mounting transmitter
The installation of Type A transmitter

Figure 5.9 Type A transmitter
Type A transmitter mainly monitor the leakage of gas in Air. Use the M8x80 expansion bolt to install the fixed plate in the position of leakage detecting, and use the M8x20 hexagon socket cap head screws to fix the transmitter on the plate via four fixing holes.
The scope of supply for the A Type transmitter (a single set): one Type A transmitter, one set of fixed plate.

The installation of Type B transmitter

Figure 5.10 Installation diagram for Type B transmitter
Figure 5.11 Dimension diagram of Type B transmitter

Note: Mount the B Type transmitter on the oil return pipe, weld it vertically, the opening size isΦ14. It should leave more than 0.5m space around the transmitter for easy operation and maintenance. Remove the vent screw from the probe if the pressure in the internal cooling tank or the oil return pipe is always positive.
The scope of supply for the B Type transmitter (a single set): one LH1500-B transmitter, one stop valve DN10.
The installation of Type C transmitter

Figure 5.12 Installation instructions for Type C transmitter in the Generator Bus bar

Figure 5.13 Type C transmitter fixing board

Note: Mount the C Type transmitter vertically with the fixed plate on the upper outlet cavity of the bus bar and the neutral point. First, install the fixed plate of the transmitter on the bus, the installation hole opening size is 4xΦ8.5, and then weld the stainless steel gas tube in the middle fixed hole, the middle fixed hole isΦ14. It should leave more than 0.5m space around the transmitter for easy operation and maintenance.
The scope of supply for C Type transmitter (a single set): one LH1500-C transmitter, one fixed plate for transmitter C.
The installation of Type E transmitter

Figure 5.14 Installation diagram of Type E transmitter
Open a hole on the water return pipe in the field which is not less than Φ20,and weld the pipe to the hole. The depth of the welding pipe inserted into the water return pipe is as short as possible.Connect the material showed in the figure 5.14 and turn off the needle valve before operating; Open the needle valve slowly and observe the flow rate of the outlet, adjust the flow rate to 30 mL/min; Use the G1/4 screw thread on the mounting seat joint of the transmitter to connect the the drainage pipe to the drain tank in the field.

Mounting GD6102 gas flow purity analyzer transmitterMode of connectionLH1500 online gas leakage analyzer is connected to GD6102 gas flow purity analyzer transmitter via RS485 digital signal. Internal connection between LH1500 and GD6102 terminal block is as follow:
Figure 5.15 Connection diagrams of LH1500 online gas leakage analyzer and GD6102 gas flow purity analyzer transmitterMode of mountingOpen a hole ofΦ22 on the water tank. Select the appropriate height position to mount the transmitter. It must ensure that the water in the cooler does not enter the transmitter. It is recommended to weld approximately 2 m long pipe (DN15) vertically, weld the movable joint on the pipe and install the valve, connect another end of the movable joint to the transmitter by the screw thread. The outlet of the transmitter is connected to the manual stop valve which is normally closed. The specific installation dimension is shown below.

Figure 5.16 Transmitter dimension diagram

Figure 5.17 Movable joint dimension diagrams

Figure 5.18 Transmitter mounting diagram
Figure 5.19 Welding diagram

Attention of Installation:
Mount the transmitter vertically (The direction of air intake is perpendicular to the horizontal plane);The vertical distance between the transmitter installation location and the top of the stator cool water tank is not less than 2m;Reserve 0.5m space around the transmitter for maintenance.
The scope of supply for GD6102 transmitter (a single set): one GD6102 transmitter, one stop valve DN15.Use and operation methodBoot interfaceTurn on the power switch and enter into the boot interface, software version info section, and system initializing, the instrument will enter into the measurement menu automatically after 5 seconds.
Figure 6.1 Boot interface
Here Vx.xx indicates the software version and yyyy-mm-dd is the date of the software version.
MeasurementSelect "Measurement " in the main menu to enter the measurement display" interface, which displays as figure 6.2.

Figure 6.2 Measurement display interface
With this measuring interface, 8 gas detection transmitter input channels of the instrument can be measured in real time, including gas, measured value, alarm status, daily maximum concentration value and maximum time.
1) Interface instruction
The measurement interface consists of two parts: title display, channel display.
Title Display: It can display the real-time measured data, gas type and the maximum value of the day from a particular channel in a larger font. Each channel is rotated every 5 seconds. Convenient for users to observe from a distance
Channel Display: it can display simultaneously the real-time measurement and status information of the 8 channels.
Among them: the channel number, gas type and concentration value of the measurement channel are displayed as "--", indicating that the channel is not enabling state. Channels 4, 6, 7 and 8 are shown in the Figure 6.2.
The Concentration displays "----" which shows the channel is disconnection, see Channel 1,5 in Figure 6.2
The Concentration displays in red which shows that the channel is in H alarm condition. See Channel 3 in Figure 6.2

Main menu Press in measurement menu to enter the main menu. The user can select the function options .The main menu shows as Figure 6.3.Figure 6.3 Main menu
1) Keys instruction:
Press to switch the main function menu;
Press to select the submenu under the main function menu.
Press to enter the selected interface when the selected option is green.Data queryUnder the main menu, select the data query menu, you can enter the data query interface. The historical alarm time and peak measurement data of each gas measurement channel are counted in hours.

SettingFigure 6.4 data query

Setting includes the "Channel setting" and "System setting" sub-menu.
Channel SettingSelect "Channel Setting" in setting menu to enter the interface.
Figure 6.5 channel setting
In channel setting, the user can select the channel and set the gas type which includes three modes: 1: none, 2: (4~20) mA, 3: RS485.
Select (4~20) mA to display as below.

Figure 6.6 channel setting
In this interface, the user can configure the upper and lower limit of the range which response to output (4~20) mA analogue signal. The upper alarm limit is set to the high alarm of the channel. After setting, select "Save" to save Settings.
RS485 is connected to the transmitter of GD6102 gas flow analyzer, which is shown as follows.
Figure 6.7 Channel setting
In this interface, the user can configure the upper and lower limit of the range which response to output (4~20) mA analogue signal. The upper alarm limit is set to the high alarm of the channel, the H alarm value should be set within measurement range. Input the number of gas flow analyzer transmitter. After setting, select "Save" to save the configuration.
If selected the GD6102 gas flow purity analyzer transmitter can measure the flow, it will display as below.

Figure 6.8 Channel setting
In this interface, the user can configure the upper and lower limit of the range which response to output (4~20) mA analogue signal. The upper alarm limit is set to the high alarm of the channel, the H alarm value should be set within measurement range, and the equipment number is the number of gas flow analyzer transmitter, Reset interval is the time interval for cleaning up the accumulated gas volume. After the setting, select "Save" to save the configuration.System SettingIn System menu, the user can setup the time which show as below.

Advanced menuFigure 6.9 System Setting

Select advanced menu in main menu to enter the advanced display interface. The advanced menu

function is to test whether the current output and alarm output of the instrument are normal.

Current output testFigure 6.10 Advanced menu

In this menu, the user can test the current output:
First select the channel, you can choose a single channel or all channels Setup the current value within the range of (4~16) mA;
Use ammeter to test the current output value. If there is no current output, need maintenance.
Relay output testIn this menu, the user can test the relay output:
First select the channel, you can choose a single channel or all channels Setup the relay status, off or closed;
Use the multimeter to test whether the relay output is off or closed. If the status is incorrect, need maintenance.about menuIn main menu, the user select about menu to enter the about display interface. It Displays the product name, factory serial number, software version and hardware version and so on.

Figure 6.11 about interface
Notes:
Factory serial number: xxxxxx indicates the serial number of the instrument. Software version: Vx.xx xxxxxxxx is for the software version of the instrument. Hardware version:xxxx xxxxxxxx is for the hardware version of the instrument.Key operation instructions:
Press to page turning ;
Press to switch the about interface and the main menu.
CalibrationSummary:The calibration of LH1500 online Gas Leakage Analyzer is mainly refers to the transmitters. It has been calibrated at the factory according to standard application conditions. Required Equipments and MaterialsZero Point Gas:Clean air

Linear Gas:(1.50~2.50)% Hydrogen of standard gas(the background gas is air)
Note: The calibration accuracy depends on the quality of zero point gas and standard gas as well as the accuracy of output current by the standard power supply. Calibration methods Calibration methods are the same for each transmitter. See Figure 6.12 for the appearance dimension of the transmitter.Figure 6.12 Transmitter appearance dimension
Before the transmitter calibration,the front cover of the transmitter should be taken off first, please turn it in anti-clockwise rotation, a circuit board will be found inside after screwing the cover slowly. The adjustable potentiometer is on the circuit board, the potentiometer zero mark as ZERO, and the potentiometer span mark as SPAN. The calibration method is as follows.Zero point calibration:Put the sensor side of the transmitter into the zero point gas (usually clean air). After the indication of the host machine gets stable, adjust the current to 0% with potentiometer ZERO (low in clockwise and high in anti-clockwise) if the reading is not 0%.Linear calibration : Input the linear standard gas to the inlet of the transmitter (recommendedstandard gas is (1.50~2.50)% Hydrogen and the background gas is air) and adjust the flow rate to (200~300) mL/min. After the host machine gets stable, if the display value does not accord with the standard gas, adjust the potentiometer SPAN (turn clockwise and counterclockwise) until the display value is consistent with the standard gas value.

Follow the same operation to calibrate the other transmitters.
When calibration completed, properly install the cover with the transmitter.
Note:Make sure the correct wire connection otherwise the transmitter might be damaged. When calibration is performed in the field, do avoid of generating explosive gas mixture.
Notes: Please contact the manufacturer or supplier for calibrating GD6102 gas flow purity analyzer transmitter.Calibration CycleUser calibration cycle: In the field, user can check the measurement accuracy with reference standards when the instrument is running. The calibration cycle of LH1500 online Gas leakage analyzer is 12 months. When the measured gas humidity is higher or the concentration of Hydrogen is higher, shorten the calibration cycle accordingly. The analyzer should be calibrated in time after replacing the main components or repairing.FAQ and Solutions

Failure introductionReasonsolutionRemarksNo display on LCD when
powering onNo power conductionCheck the powerAny unsolved problems occur, Please contact the factory ASAP.
The transmitter display larger error
The calibration data loses or changesRecalibrate or return to the factory ,or replace the
sensor probeThe transmitter displays
disconnectingThe transmitter is not well
connected.
Check the wiringClock has no changeThe button battery without
electricityReplace the battery

Storage and shippingThe packed host machine is suitable for any mode of transportation, but should be handled with care and keep away from inversion, sun, rain and strong vibration. The host machine should be stored in the warehouse where there is no corrosive gas and ventilate well.

Open-package inspectionPlease check the instrument and its accessories are available against the packing list after unpacking, whether there is any damage during transportation, whether the documents and accessories are complete.OthersSpare partsPacking list Certificate Instruction manualRecycling and environment informationWhen the product life cycle ends or is scrapped, it should be handed over to the local state permitted units for recycling.After-sales servicesWe supervise on-site installation, guide commissioning, and give training to the operators. Warranty period is 12 months. Life-long maintenance of products is available with certain maintenance fee.
During using the instrument, the damage caused by non-normal failure use (such as Lightning, voltage instability, damp or artificial factors, etc.) is not covered by the warranty.