GPRS modem TKB for domestic gas meters
GPRS modem TKB for domestic gas meters (hereinafter, GPRS modem TKB) is intended for use in gas consumer metering units having gas meters with a standard size of up to G10 (hereinafter, BSG) to automate metering, set up information networks and provide metering data to supervision and accounting services in compliance with gas accounting rules in force.
GPRS modems TKB are intended for operation with gas meters having a low frequency “dry contact” output with a frequency up to 2 Hz and a pulse duration of minimum 50 ms (LF).
The GPRS modem TKB is connected to BSG through an impulse transmitter built in the GPRS modem TKB (Fig. 1) or with a remote impulse transmitter (Fig. 2).
GPRS modem TKB with a built-in impulse transmitter (for gas meters: SAMGAZ)
GPRS modem TKB with a remote impulse transmitter (for gas meters: SAMGAZ, Elster, Metrix, Itron)
GPRS modem TKB with a built-in impulse transmitter and a gas meter
Basic functions of GPRS modem TKB:
- Receives impulse signals from impulse transmitter BSG;
- Totals the natural gas volume in operating conditions according to data received from BSG;
- Accumulates and stores gas volume data:
- per hour, during 64 days;
- daily, during 128 days;
- monthly, during 32 months;
- accumulates and stores information on the time and character of emergencies during 128 days;
- accumulates information about configuration changes in GPRS modem TKB;
- detects attempts of using a magnet to distort BSG readings (date, and time of start and end of magnet action);
- sends accumulated data to the dispatcher server over the GPRS communication channel (the parent enterprise determines the data transmission schedule);
- can change remotely the communication start schedule and the volume of information sent to the dispatcher server;
- sends to the dispatcher server data on the condition, charge level and service life of power supply batteries, the GSM signal level, etc.;
GPRS modem TKB is of the explosion protection design with an “intrinsically safe electric circuit”, has the marking “1ЕхibIIАТ4”, and meets the requirements of DSTU 7113, GOST 22782.5-78 (Certificate STs16 0053. Addendum to Certificate STs16 0053.)
Protection degree as per GOST 14254-96 (IEC 529-89) for GPRS modem TKB IP54.
GPRS modem TKB uses a radio terminal (radio module) of the cellular communication system GSM-900/1800. GPRS modems TKB are certified and included in the “Registry of radio electronic equipment and radiating devices used in the territory of Ukraine in public radio frequency bands” of the SE “Ukrainian State Centre for Radio Frequencies” (Certificate of conformity).
Depending on the operating conditions, GPRS modems TKB are made with a built-in or external antenna.
GPRS modem TKB is powered from a built-in lithium battery providing uninterrupted service for minimum 8 years provided the following operating conditions are met:
- Polling not more often than once in 10 days;
- Level of GPRS signal, minimum 15 units.
GPRS modem TKB operating mode: prolonged and continuous.
GPRS modems TKB are operated at ambient conditions -40 °С to +85 °С, air humidity up to 95 % at 25 °С.
Basic technical specifications of GPRS modem TKB:
- Mean-time-between-failures, minimum 17,000 hrs;
- Output power:
- Class 4 (850/900 MHz, max. 2 W;
- Class 1 (1800/1900 MHz, max. 1 W;
- Data transmission: GPRS Class 10/8 В, built-in ТСР/ІР protocol;
- GPRS modem current consumption:
- In the message transmission mode, max. 120 mA;
- In the mode of information receipt by the GSM network, max. 20 mA.
To work with GPRS modem TKB is provided with program “nVega (t)” with the following functions:
Selective polling and modification of the parameters of a separate GPRS modem TKB;
Display of information read from the GPRS modem TKB in tabular form;
Generation of reports on operation of GPRS modem TKB for a specified time interval.