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

MAIN

BOARD

POWER

SUPPLY

Embeded High Density Energy

lithium Cell

Working lifetime≥10 Year

MEASURING

DATA

ACQUISITION

TWO REED SENSOR ACQ

ELECTRIC SQUARE

COMMUNICATE

GSM?GPRS

ELECTRO

VALVE

REAL-TIME

CLOCK

Gas

Leakege

Monitor

LCD/ALARM

DEVIATION≤10PPM

(Monthly maximum datetime

allowed deviation≤1minute)

1. with pressure presetting,

2. USE Pt trasducer(platinum resistence) to measure Temperature ,

then correct the Correctedted the metrology data To STANDARD

condition

GAS METER WORKING DIGRAM

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.

Clock Module: Using high accuracy clock chip from Dallas Company, clock

offset≤10PPM.

Temperature compensation: Adopting PT1000 sensor, conform to EN60571 A

Class

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.

Whether operation of Valve is normal or not.

Whether the condition of memory is normal or not.

Whether the condition of measuring sensor is normal or not.

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.

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

rate.

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

latest meter cover open.

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

4.3 Hardware working principle

Battery Input

Power Supply

management

Output: 4.2V 3.3V

MCU

LED

Indication

Gas meter data

acquisition interface

SIM

card

slot

LED

Indication

Hardware

Clock

Voltage

Testing

Clock Battery

RS232 interface

Siemens module

system

Data

storage

NULL

Jumper

testing input

Base Gas meter

HT6000 GSM DTU

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

CDMA/GSM/GPRS

BILL &MANAGEMENT SYSTEM

WEB SERVICE

client

client

client

firewall

router

internet

表具终端

operator

operatoroperator

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

Accuracy Class Class 1.5 Tariff and TOD

3 Tariffs,

5TOD

intervals

Backup Battery 3.6VDC, Cap.

12AH RTC accuracy 0.5s/d(23℃)

Battery’s Life

NOT LESS

THAN 10

YEARS

Static working

current(without

GSM)

10µA

Operational

temperature -20 ~50 ℃

Average

Rel.Humidity ≤93%

Explosion-Proof

class BПB

Basic measuring

unit 0.01 m3

11 Base meter specification

Item Unit Model

G1.6 G2.5 G4

Nominal flow-rate (Qn) m 3/h 1.6 2.5 4

Maximum flow-rate

(Qmax) m 3/h 2.5 4 6

Minimum flow-rate

(Qmin) m 3/h 0.016 0.025 0.040

Total pressure absorption Pa ≤200

Operation pressure range kPa 0.5～30

kPa 0.5～50 kPa

Cyclic volume dm3 1.2

Permiss

ible

error

Qmin≤Q<0.1Q

max % ± 3

0.1Qmax≤Q≤Q

max % ±1.5

Min. recording reading dm3 0.2

Max. recording reading m 3 9999.999 99999.999

Operational ambient

temperature ℃ -20～+50

Storage temperature ℃ -20～+60

Central distance mm 110

Connection thread M30x2, 3/4”, 1"1/4 (or by

customized)

Dimension mm 225x195x170(H×W×D)

Weight kg 2.00

Outside casing Quality steel sheet, thickness is

0.8mm

Service life years 15

Surface painting Polyester powder plastics coating (gray)

Index cover Printed index cover of polycarbonate or index

cover of aluminum bezel with glass.

12. Electro-valve specification

Actuating medium Natural gas、Coal gas、Liquefied petroleum

gas

Current capacity scope 0~6m³/h

Working pressure scope 0~4.2KPa

Relative humidity ≤90%

Pressure loss ≤50Pa

Sealing property (outside) No leakage under 20KPa

Sealing property (inside) 10KPa (3min)≤120pa

Durability Normal working>10000

Working current ≤80mA(3V)

Working voltage DC3~6V

Peak current 220 mA (3V)

Opens and close cycle 2S±0.1S (3V)

Structure The material uses Metaformaldehyde Rubber