G4SZV-1/G4SZV-2 & G4SDZV-2 V1.10
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1.
Before You Start
The G4S series meter is a high accuracy measuring instrument that must be handled with
care. The meter should always be kept in vertical position, in service and during
transportation.
The device should be fitted only by competent engineers, qualified to the relevant national
legal requirements and following all national and local regulations such as BS 6400
2.
Product Description
G4S series meter is a smart diaphragm gas meter, SMETS compliant, with an electronic
index. The meter includes ZigBee radio and an integrated electrically operated valve. The
meter displays the accumulated consumption in m3 or currency, selectable by the menu
system, on an integral LCD.
This G4 (U6) capacity diaphragm gas meter i.e. Qmax = max flow rate = 6 m3/h, is
intended for domestic and small industrial use.
The measuring chamber is a “sliding D” diaphragm type. An optical interface provides the
coupling between the measurement chamber inside the casing and the electronic index.
The optical interface uses a Gray code methodology providing reliability, very precise
accuracy. The meter is also fitted with a device to prevent reverse flow.
The dot matrix display allows for the two lines of data required by SMETS1. In addition,
there’s space for other icons used to assist the end user or installations engineer.
The meter has a HAN interface solution designed for the ZigBee RF interface 2.4MHz or
868 MHz (MKII only) and the SEP 1.X requirements as specified in SMETS
A user-friendly configuration software allows all functions to be accessed by the optical
communications connection located on the front face of the index.
Reading and writing possibilities can be controlled by a customised setup file.
NOTE!, this interface is disabled during normal operation and can only be used for triage
purposes, once the meter is off the wall and disconnected.
The meter can be configured (by the HES) to run in two modes
1
Credit mode:
the user will accumulate charges that will be shown on the display.
This will be transferred to the HES and an automatic bill can be generated, on a
monthly or Quarterly period.
2
Prepay mode:
the user will
purchase “upfront” an amount of prepaid credit that
they will then be able to use. This prepay credit is
purchased “online” or in local
shops and is known as a UTRN code (Universal Transaction Reference Number)
after the total prepaid amount is depleted the gas meter will close the gas supply.
Certain measures are implemented to prevent closure at certain times (i.e. when
the shops are closed and it is not possible to purchase a UTRN, these are known
as Friendly credit periods and are decided by the utility alone), in addition special
emergency credit facilities may be offered in certain circumstances.
