Holley GSM/GPRS Smart Gas Meter Solution

1. Overview GSM/GPRS Series Smart Gas Meter is a new generation intelligent gas meter developed by Holley, which evolved on prepaid gas meter. It adopts Siemens GSM Module 900/1800/1900Mhz communication module to send consumption data timely to the data center. This AMR technology will make operators benefit from recording the load profile and Input-Output Ratio online.

2. Conform Standards MID 2004/22/EC and EN12405; IEC 60079-0, 11; UNICN13757, IEC60870;

3. Main Feature 3.1 Working principle GAS METER WORKING DIGRAM

GSM?GPRS

DEVIATION≤10PPM (Monthly maximum datetime allowed deviation≤1minute)

COMMUNICATE

REAL-TIME CLOCK

TWO REED SENSOR ACQ ELECTRIC SQUARE

MEASURING DATA ACQUISITION

MAIN BOARD

Embeded High Density Energy lithium Cell Working lifetime≥10 Year

POWER SUPPLY

Gas Leakege Monitor

ELECTRO VALVE

LCD/ALARM

1. with pressure presetting, 2. USE Pt trasducer(platinum resistence) to measure Temperature , then correct the Correctedted the metrology data To STANDARD condition

3.2 General Description



MCU: Using TI or MICROCHIP Company’s SCM, low power dissipation and high performance.



Powered by built-in 12AH li-battery, service life >10 years



Using mature dual reed switches measuring technology.



Communication Module: GSM 900/1800/1900MHz



Electro-valve: high reliable, lower voltage loss, low power dissipation.

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Clock Module: Using high accuracy clock chip from Dallas Company, clock offset≤10PPM.

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Temperature compensation: Adopting PT1000 sensor, conform to EN60571 A Class

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Communication Interface: Using standard RS232, protocol is definable.

 Allowing interface of gas leaking alarm.

3. 3 Tariff Calculation Following parameters can be recorded automatically: 

User’s information in five different time intervals. Time point of calculating could be preset.



Gas consumption records of recent one hundred days could be saved and easy to get the gas consumption curve at any time interval.

3.4 Clock correction and Synchronization 

Our gas meter has built in clock with perpetual calendar. The monthly maximum time error is less than one minute. Clock can be synchronized by handheld pc or the radio instruction from the administration centre.

3.5 Valve Control 

Our gas meter has a built in electro-valve, to control the user’s gas consumption. Under abnormal conditions like, battery running out, built in EEPROM damage, measuring sensor damage, abnormal flow-rate, backing up meter parameter error, gas meter will shut down valve automatically. After fixing errors, valve

can be re-opened by pressing the trigger button or switching off and switching on the power supply.

3.6 Display 

Our gas meter has both register display and LCD display. Without user’s operation on meter, LCD screen will keep shut in order to preserve battery power. When display button being pressed down, LCD screen will light on. After releasing display button for sixty seconds, meter will enter low power consumption mode, at the meantime LCD screen shuts down. The default display content is accumulated gas consumption. By keep pressing the display button, other information will display in turn. Displaying

information is

accumulated gas consumption, recent month gas consumption, present time, gas meter serial number.

3.7 Alarm Function 

Under the condition like battery running out, electro-valve error, abnormal clock error, the gas meter will alarm and display alarm information on the LCD screen.

3.8 Measurement data upload 

Our gas meter will upload user’s information to administration centre regularly. The frequency of uploading is adjustable by the administrator.

3.9 Self-diagnostics and event in time report function Our gas meter could carry out self-diagnostics aiming at the condition of meter internal operating. And the information of self- diagnostics is as follows: 

The accuracy of clock



Whether the remaining energy of battery is sufficient or not. Once the inadequate remaining energy of battery is being detected, it will report to administration centre for the in time battery replacement.

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Whether operation of Valve is normal or not.

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Whether the condition of memory is normal or not.

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Whether the condition of measuring sensor is normal or not.

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Whether the parameters of internal operation are normal or not.

3.10 Operation parameters recording Our gas meter can record operation parameters automatically. And these parameters are as follows: 

The number of times of magnetic disturbance and the happened time of latest magnetic disturbance.



The number of times of battery replacement and the happened time of latest battery replacement.

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The number of times of high flow rate and the happened time of latest high flow rate.

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The number of times of illegal open of meter cover and the happened time of latest meter cover open.

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Gas meter alarm and the happened time of latest gas leakage.

3.11 Temperature compensation GSM Series smart gas meter （ G1.6-G4 ） have the characteristic of temperature compensation. Built-in software will automatically transfer the value detected into standard environment’s value（1.01325 bar，15° C ） Formula：Vb=(Pm/Pb) *(Tb/Tm)*(Zb/Zm)*Vm Its accuracy to reach the European standards of measurement EN12405 Note: 1000 sample meters will do not have the above functions, but the data format has reserved the words byte for this function. After sample meter period, we will supply you with this function, and the same time, Display way will use LCD only.

3.12 Authorized valve open through long distance Management system can authorize users to open valve through wireless network. The

electro-valve will shut down automatically due to user’s illegal operation or gas meter fault. After fault being ruled out, user can make an application of re-open valve to administration centre, and administration centre can authorize user through long distance. After accepting the authorization, then user can open the valve by pressing the button on the gas meter.

3.13 Data transmission To make sure the safety of data trasmissiting, this meter adopts international universal DES encryption.

3.14 Maintenance & Management It is easy to manage the smart gas meter. This meter can exchange data with data center bidirectional, and also can exchange data with HHU locally. Operator can download the Key, can configure the setting, and the same time can read data through HHU device.

3.15 Online configuring tariff function This smart gas meter has the characteristic of online configuring tariff. Operator will benefit from this function.

3.16 Software updating Interface is reserved to update software. We will supply you with device to update software. So, it will be very convenient for operator to updating software.

4 GSM DTU main features 4.1 Product Specifications 4.1.1 Voltage Specification: 3.6V (Input), high capacity lithium battery 4.1.2 Data capacity specification: Gas meter data stored in local memory, and memory can be extended.

4.1.3 Module specification: Siemens’s industrial communication module adopted, 4 frequency bands supported.

4.2 Functions 4.2.1 Support working in SMS mode or GPRS mode 4.2.2 Support setting of intervals for collecting and uploading data 4.2.3 Support checking of local GSM signal strength 4.2.4 Support remote reading of gas meter ID 4.2.5 Support local and remote time calibration

4.2.6 Support local storage of collected data, which memory can be extended as per customer requirement

4.2.7 Support real-time battery indication. The low battery threshold can be configurable to alert the users to change the battery.

4.2.8 Support setting of system working hours for extending battery life

HT6000 GSM DTU

Base Gas meter

4.3 Hardware working principle

NULL

Voltage Testing

Power Supply management Output: 4.2V 3.3V

Battery Input

Gas meter data acquisition interface Clock Battery RS232 interface MCU

Hardware Clock

Siemens module system

Jumper testing input Data storage

LED Indication

LED Indication

SIM card slot

4.4 Main functions 4.4.1 Low consumption: The DTU can be waked up passively by the gas meter or actively by the system on schedule. In working mode, the DTU can passively accept the gas meter push data or actively pull to read the gas meter data

4.4.2 High capacity data storage: According to the protocol, the data stored can be read through RS232 interface and the memory can be extended according to the data volume.

4.4.3 Working mode setting: The DTU can work in SMS mode or GPRS+SMS mode. 4.4.4 SMS center setting: Maximum 15 bytes. Please consult the local mobile operator to get the parameter.

4.4.5 Group SMS: Users can specify more than one data centers to upload the data to multiple data center servers.

4.4.6 Interval of data acquisition: 10-50000 min as per customer requirement. The battery life can be extended if the interval is set to be longer.

4.4.7 Interval of data uploading: 10-50000 min. 10-50000 min as per customer requirement. The battery life can be extended if the interval is set to be longer.

4.4.8 DTU online time: 30-1800 sec. The energy consumption of the module can be controlled in order to extend the battery life.

4.4.9 SMS data processing mode: It supports transparent mode and local storage mode; if the data cannot be uploaded due to network failure, the data can be stored in local memory to ensure that the data will not be lost.

4.4.10 DTU ID: 12 byte for DTU ID; the local gas meter address can be inquired. 4.4.11 GSM status: Users can inquire the GSM signal strength to avoid low communication success rate caused by the poor quality of local network.

4.4.12 Battery level inquiry: Users can set a threshold to trigger the low battery alarming and inquire the voltage of the battery. In low battery mode, reminders will be sent to the users for battery replacement.

4.5 Battery features and Sleeping Strategy 4.5.1 Battery Type We use high capacity and power battery which is safe and stable with low self-consumption 4.5.2 Energy-saving Strategy

The system works in three working modes: Sleeping mode, data-receiving mode and data-uploading mode. Workflow: After the system is powered, the DTU enters the data-receiving ready mode. If no data is received, it enters the sleeping mode. When the DTU is in sleeping mode, the system can be waked in two ways: 1: The system can be waked by the gas meter module to enter the data-receiving mode. It returns to sleeping mode after the data receiving is completed. The waking time interval is set according to the data-acquisition interval of the gas meter. 2: The system enters data-uploading mode. After the data uploading is completed, it enters the sleeping mode again. 4.5.3 Battery Consumption Analysis We use 12AH high power lithium battery which is very popular and easy to be sourced in the market. Working parameter and mode: Interval of data acquisition: 180 min, uploading interval: 4320 min (3days)，DTU online time: 300 sec. Based on the above parameters, the system can work for 9 years.

5 Specifications of Uplink and Downlink SMS All SMS data length should be less than 140 bytes. All parameters can be configured through serial port or SMS: The serial port is mainly used for local configuration while SMS is mainly used for remote configuration. The SMS setting is illustrated as below:

The tree structure in the left includes all the node names and the corresponding phone numbers. If the SMS mode is selected, the messages should be sent according to the format as below: Header of SMS uplink frame + SMS content The SMS uplink frame starts like this: SMSsend13116742086F, among which SMSsend is the beginning, followed by 3-15 byte target phone number and ended up with F, and plus the content to be send. For example, to set the working mode of the data center, assume the password is “123456” and working mode “1”. Then format of SMS message is: SMSsend13116742086F*SET123456WKMD=1& Responding frame of server DTU for downlink data The frame header returned: SMSback13116742086F For example: SMSsend13116742086F*SET123456WKMD=1& Responding data:

Sent successful: SMSback13116742086Fsetok Sent failed: SMSback13116742086Fsetfaulure GSM closed: SMSbackGSMclosed

5.1 The DTU Formats of Downlink SMS message format mainly includes 4 types: reading format, setting format, special format and sending format. 5.1.1 SMS format outline SMS format setting: *＋read-write operation＋password of 6 digit ＋one or >one query items＋&,the query items are separated with ‘#’. Starting symbols：

‘*’

Read-write operation： GET&SET 6 digit password: admin password is HTGPRS，initial password is 为 000000. One or >one query items: the parameters are separated with ‘#’. Ending symbol： ‘&’ After read-write success, a SMS will be returned. 5.1.2 SMS setting A SMS will be returned after successful setting For example: ① To set the IP address of data center, imagine the password is “123456”,IP address is 192.168.1.1,then the SMS format is : *SET123456DCIP=192168001001& ② To set the serial interface number of data center, imagine the password is‘123456’ ， serial interface number is‘2008’ ，then the SMS format is： *SET123456DCPT=02008& ③ To set multiple data formats, imagine the password is “123456”,IP address is 192.168.1.1, the communication port number of data center is 2000，the APN is CMNET， heart beat cycle is 8, then the format is: *SET123456DCIP=192168001001#DCPT=02000#GAPN=CMNET#HBCY=5& 5.1.3 SMS Read

①To read the IP address and the communication port number of data center, imagine the password is‘123456’, the read format and returned SMS format are : Read： *GET123456DCIP& Responding： *GETDCIP=192168001001# ②To read multiple parameters, imagine the password is‘123456’ ，the read format and returned SMS format are : Read：*GET123456DCIP#DCPT#GAPN#HBCY& Responding

：

*GETDCIP=192168001001&DCPT=02000&GAPN=CMNET&HBCY=005# 5.1.4 Special command Re-link GPRS network command. *SET123456RLIK& Re-linked GPRS network command returned *SETOK#>>12345678RELIKING 5.1.5 Sending message The data sent is the data set in the textbox, either HEX or asc. SMSsend13116742086F123456789

6. DTU Software Management Workflow The PC software collects all the uploaded data and performs data analysis and exporting functions.

7. DTU Functions (optional) The GPRS function is optional to send the data to the target server. The cost will be comparatively lower especially for transmission of large data volume (SMS service is charged per message while GPRS is charged according to the data volume). The GPRS function is more complex and the battery consumption will be higher (More steps to access GPRS). The advantage is that large volume data can be sent (SMS can contain max 140 bytes while a GPRS packet length can be 1500 bytes at maximum)

8. Note DTU（full name: Data Transmission unit） DTU terminal ID: Set by user, the ID of the module SMS: Text message Working mode: SMS mode &GPRS（TCP，UDP）mode; In SMS mode, only SMS function supported.

9. Network topography

BILL &MANAGEMENT SYSTEM WEB SERVICE

client

client firewall client

router

internet

CDMA/GSM/GPRS

operator

operator

表具终端

operator

Before deploying smart gas meter, Operator should set up customer profile in the management system, and then write user information into SIM Card. Once this SIM card is inserted into smart gas meter, smart gas meter complete its register process.

10 Electronic part specifications Conform standards

EN1359 and OIML R31 3 Tariffs,

Accuracy Class

Class 1.5

Tariff and TOD

5TOD intervals

Backup Battery

Battery’s Life

3.6VDC, Cap. 12AH

RTC accuracy

NOT LESS

Static working

THAN

current(without

YEARS

10

GSM)

0.5s/d(23℃)

10µA

Operational temperature Explosion-Proof class

Average

-20 ~50 ℃

≤93%

Rel.Humidity Basic measuring

BПB

0.01 m3

unit

11 Base meter specification

Item

Unit

Nominal flow-rate (Qn) Maximum flow-rate (Qmax) Minimum flow-rate (Qmin)

Model G1.6

G2.5

G4

m 3/h

1.6

2.5

4

m 3/h

2.5

4

6

m 3/h

0.016

0.025

0.040

Total pressure absorption Pa

≤200 0.5～30

Operation pressure range

kPa

Cyclic volume

dm3

1.2

%

±3

%

±1.5

Min. recording reading

dm3

0.2

Max. recording reading

m3

Permiss ible error

Qmin≤Q