Issuu on Google+

Gas Quality Data Recording Device MRG 2203


Serving the Gas Industry Worldwide



Analog outputs

The MRG 2203 is a data-recording device which has been specifically designed for recording gas quality data. In particular, all performance features are available which are required in the base specification for the planning, construction and modification of gas quality measuring plants of Ruhrgas and Ruhrgas project companies using process gas chromatographs. The MRG can be operated in conjunction with 1 or 2 process gas chromatographs (PGCs) or correlative gas quality measuring devices (CGMs).

All measured values can be outputted as currents from 0/4 to 20 mA through the analog outputs. Every addressable data element of the bus system can be outputted. Thus, the superior calorific values of the process gas flows can be recorded for example. The output current can also be set via the control panel or via remote data transmission.

Apart from recording data from PGCs and CGMs, which are collected via the DSfG bus, the device can be fitted with up to six input/output cards. Thus, external messages and analog measured values can be recorded by the MRG and analog quantities can be outputted as currents and/or frequencies. The MRG can be supplied in two variants: either with the conventional archive structure or with a structure optimized for the AGA8 calculation (MRG 2203A version). The MRG2203A version is the standard version. It has been designed to fulfil the requirements of the AGA8 calculation and uses the most advanced standard queries for PGCs and CGMs.

Master slave operating mode If two gas quality measuring devices (GQMs) are connected to the MRG 2203, they can be operated in master-slave mode. The master-slave operating mode refers to outputting measured values. In undisturbed operation, the master device supplies the data for the output channels. Logical output channels 1 to 6 are assigned to the data elements of standard query 2 of the PGC or standard query (I)2 of the CGM. In undisturbed operation, the data of the GQM defined as master are outputted. If the master is disturbed or under revision (testing or calibration), output will switch over to the slave. If the master returns to its operating condition, output will switch back to the master again. Switching over from the master to the slave can be done automatically or manually.

Inputs and Outputs The following process inputs and outputs are supported by the operating program: • 16 analog inputs • 20 message inputs • 20 analog outputs • 20 Signal outputs

Signal outputs

Analog inputs


Any external measured values are collected via the analog inputs and the mean values are stored in the MRG archive group. All inputs can be monitored for a lower limit and an upper limit. If a limit is exceeded, an event will be initiated and stored in the MRG log.

In the MRG 2203, the following archives are available for two GQMs in each case: • Hourly mean values for billing • Single analyses • Hourly, daily and monthly mean values for components • Calibration records with response factors (PGCs) or quality factors (CGMs) • Quality test records • 15-minute values (superior calorific value, standard density and CO2) with a memory depth of two years • Corrected hourly mean values (only CGMs) • MRG analog values

Message inputs External operating and fault messages are recorded via the message inputs (a maximum of 20 is possible). All messages whether coming or going are recorded in the MRG log. In addition, every message can trigger an alarm or a warning.

PGC functions which cannot be performed through thedigital interfaces can be initiated through the signaloutputs. The signal outputs can be remote-controlled via DSfG data elements. For this purpose, every binary output is assigned to a logical data element.

RMG Messtechnik GmbH • Otto-Hahn-Str. 5 • 35510 Butzbach (Germany) • Phone +49 (0)6033 897-0 • Fax +49 (0)6033 897-130 2010-06 •