GWFcoder® technology:

Transfers the effective meter reading. The readout value in the billing system and the invoice are the same as the meter reading.

Pulse transfer:

The potential sources of error for a reproduced meter reading with pulse transmission are:

• Bouncing
• Backflow water
• Temporary signal interruption
• Double pulses
• Incorrect pulse value

The readout value in the billing system and the invoice may differ from the meter reading.

GWFCoder Applications

Wireless pit readout

Meter with GWFcoder® register, IEC interface and GWF radio module (type RCM-PI) is read out by radio using a mobile infrastructure.

GWFRead Mobile – Wall pad reading

Encoder meters with a wall pad can be read without entering the property by means of an inductive wall pad. The meter data is then automatically assigned to the customer. The meter readout device then transmits this data wireless via Bluetooth to the Mobile readout
device.

M-Bus remote reading

The meters with GWFcoder® registers and M-Bus interfaces are connected to an M-Bus remote reading system. This ensures that the meter data is transferred directly via an M-Bus data centre or level converter to a PC where the data is further processed.

Mobile on-site reading

■ Direct or outside wall readout via the inductive interface; transmission distance of up to max. 150m

■ Outside wall readout via the CL interface without access to the measuring point; transmission distance of up to max. 150m

■ Mobile «walk-by» meter reading or «driveby » meter reading from a moving vehicle without access to the property

Remote meter reading

■ The GWFcoder® technology enables the combined remote reading of water, gas and electricity meters

■ Depending on the interface at the communication unit (e.g. modem), various interfaces (interface converter) are available to integrate the GWFcoder® water and gas meters in the remote meter reading and to read out the meters with addresses according to IEC standards

GWFCoder Variants

The metering application dictates which unit is the most suitable for any installation. Suitable units are shown below for domestic and bulk, gas and water metering applications.

GWF Coder Technology

In the GWFcoder® system, the individual rollers of the mechanical register are read out optoelectronically. The position of the various long asymmetrically arranged slits in the roller counters is scanned using 5 light barriers (light-pipe transmitter and receiver).

The light barriers are implemented with phototransistors. LEDs, and light conductors, which are all consecutively scanned and evaluated. The precisely defined position of each individual roller counter is encoded as an absolute roller counter reading and read out as a part of the protocol via the GWFcoder® interface.

This functioning principle is patented by GWF. The GWFcoder® interface, compared to a meter with a pulse output, has an incomparably higher level of information content and readout accuracy. A GWFcoder® register does not require a battery, which, in turn, does not compromise existing revision cycles. The readout device supplies the power for the readout.

DMS will be holding comprehensive stocks from November 1st 2010 of the Elster Jeavons Gas Governors and in January 2011 they will also have comprehensive stocks of the Elster Jeavons J125 medium pressure Gas Regulators and Safety Valves.

The above Elster Jeavons Gas Governor stock holding will also be complimented by the addition of the S100 ‘Slam Shut’ valve range.

The DMS staff will also be undergoing intensive training on the Elster Jeavons range of products to be able to give sizing and technical advice to our customers.

Any installation of the above products must be carried out by an approved Gas Safe Engineer

DMS now offer the range of Elster QA Turbine Meters; they hold comprehensive stocks of Elster QA Turbine meter from 1″ to 6″ (DN25 to DN150)

QA Turbine Meter Specification

The wafer type housing of QA and QAe (with electronic totaliser) is made of aluminium. Depending on the version, the volume is displayed on a mechanical (QA) or an electronic totaliser (QAe). QA and QAe Quantometers combine the high accuracy of the Q series of Quantometers with low weight.
The Quantometers are available in a number of flow ranges, diameters and pressure ratings. Depending on the version, a low or medium-frequency pulse transmitter and an optical readout or an optical readout with additional M-bus output is available.

All of the Quantometers are DVGW approved.
For special industrial applications, stainless steel versions are also available.

QA Turbine Meter Family

Any installation of the above products must be carried out by an approved Gas Safe Engineer

GWFcoder smart metering technology

They offer trendsetting smart metering system solutions based on high-precision measuring instruments and the patented GWFcoder® technology.

The GWFcoder® technology can be fitted to a wide range of meters from the simple single jet water meter to turbine type water and gas meters

With the ever increasing demand for intelligent remote data collection the GWFcoder® m-bus interface opens up a world of data transport possibilities

Diaphragm Gas Meters

Samgas & Elster range of Diaphragm Gas Meters G2.5 to G100 offer a very wide measuring range designed for working upto 0.5 bar. All models are available with the option of Low Frequency pulse outputs for use with Energy Monitoring Systems. The principal elements of the meter are a pressed steel casing internally and externally coated against corrosion. A measuring module which is inserted into the casing a complete unit and a magnetic coupling transmitting the movement to the index.
 
For ‘Smart Metering’ applications Elster Diaphragm Gas Meters are also available with an m-bus interface by using the BK Z6-1 Absolute Encoder index.

Turbine Gas Meters

QA & QAe Turbine Gas Meters

QA Quantometers are highly reliable gas meters which can be used throughout the entire field of flow metering and which fulfil all of the varying requirements of industrial metering.
The QA and QAe quantometers work on the principle of the rotating turbine wheel. The rotation of the turbine wheel is proportional to the volume of the flowing gas and this volume (Vb/m3 ) is registered by either a mechanical (QA) or an electronic (QAe) index. The QA & QAe  turbine gas meters are available in sizes DN 25 (1″) to DN 150

For ‘Smart Metering’ applications the QAe Gas Meters with electronic indexes are also available which have an EN1434 m-bus interface as standard.

Q75 Short Pattern Turbine Gas Flow Meters

The Q/Q75 series of quantometers are well known in the field of industry and commerce as robust and accurate turbine meters. They have a low price and are particularly suitable for highly-accurate and reliable metering, also in higher flow and pressure ranges.

The Q75 is available in sizes DN 50 to DN 600

Roots Rotary Positive Displacement Meters

The ROOTS© meter is designed to accurately measure the total volume of dry gasses and gas mixtures. The time tested and accepted ROOTS© meter with its permanent accuracy employs the rotary positive displacement principle. This built-in accuracy is fixed by precision machined impellers and a rigid measuring chamber. Measurement is not affected by changes in gas specific gravity of pressure nor by wide fluctuating flows. The ROOTS© meter is available in sizes DN 50 to DN 200

CPT Turbine Gas Meters

The CPT Quantometer is a turbine gas flow meter based on the rotation of an impellor, the speed of rotation being proportional to the flow rate of the gas. A magnetic linkage transfers this movement to the mechanical index, which provides an accurate reading of totalized gas flow and a scaled pulse output for remote reading etc. The meters are constructed for installation between flanges like a “sandwich”. The index head can be rotated through 350 degrees. The CPT  turbine gas meter is available in sizes DN 50 to DN 200

DMS sell a wide range of gas meters one of these meters is the Cubix U6 OFGEM Approved domestic gas meter with the follwing features: -

The U6 Cubix meter is BS746 (British Standard) Screwed 3/4″ Brass Meter Unions are included

Suitable for Natural Gas and LPG Applications Fits Standard Household (152mm) Meter Box Brackets

U6 3/4″ Meter Installation Kit with Regulator

Kit Includes

• BS746 (British Standard) Screwed 3/4″ Brass Meter Unions Union Gaskets Included
• 3/4″ Angled Meter Regulator
• 300mm x 3/4″ Flexible Connection

J42 Domestic Gas Regulator

The J42 is an angled type regulator designed for low pressure domestic meter applications with inlet pressures up to 350mb.

The J42 meter service regulator meets the requirements of British Gas Specification PRS3. It has full lock-up capability and is available with or without integral under pressure cut off (UPCO). The UPCO version has an automatic reset which re-establishes supply dependant upon the system integrity. It can be mounted in either a vertical or horizontal orientation, and is suitable for use with natural, liquid petroleum and manufactured gases.

Any installation of the above products must be carried out by an approved Gas Safe Engineer  – These products are available at our e-bay shop