RMG ERZ2000-NG, Operating Manual

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7 Parameter of the gas
Manual ERZ 2000-NG · EN07 · 2019, May 13th
305
With this coordinate, the ERZ input variables are linked with the desired PGC
data.
Gas chromatograph PGC9300 of RMG offers the possibility of operating 4 dif-
ferent measuring points; in the process, the measuring point is switched after
each measurement. These measuring points are identified as Stream 1,
Stream 2, Stream 3 and Stream 4. If one of the buttons under the table
(PGC9300: Stream 1, 2, 3 or 4) is activated, the assigned measurement point
is operated (only). A presetting takes place (the affected fields have a bright
yellow-green background) and the measured values are assigned Modbus ad-
dresses. If a different stream is selected, the Modbus address assignment
changes. In menu
IM Modbus Master GC2 , a different stream can be selected
for the same PGC. Therefore, 2 different measuring points can be operated.
The applicable computation possibilities described in
chapter 4.3.2 Modbus
master overview
enable the conversions described below:
Unit conversion
A value coming from the PGC can be converted using a conversion factor. For
instance, to convert the calorific value with the unit
kWh/m³ to MJ/m³ ,
"F7020*3.6" must be entered in coordinate IL01 .
E § 1 Sup.calorific val. MJ/m3
Addition rules
It is possible that there is no entry field available in the ERZ2000-NG for a gas
component measured by the PGC, such as cyclo-pentane in register 8290. In
this case, the cyclo-pentane can be added to the share of another component,
e.g. neo-pentane in register 8264. Then, "F8264+F8290" must be entered in
coordinate
IL13 .
E § 13 Neo-pentane mol-%
Distribution rules
It is possible tha a PGC does not output the components hexane, heptane, oc-
tane, nonane and decane individually, rather as the sum of hexane plus higher
alkanes, generally in register F8272. In this case, the sum is distributed accord-
ing to the 1/3 rule of the respective components: hexane, heptane, octane, ...
provided in the ratio of 81 : 27 : 9 : 3 : 1. Standardized to 121 (= 81 + 27 + 9 +
3 + 1) produces the ratios 81/121 : 27/121 : 9/121 : 3/121 : 1/121. Then, the
following must be entered in
IL14 to IL18 :
E § 14 Hexane/C6+ mol-%
E § 15 Heptane/C7+ mol-%
F7020*3.6
F8264+F8290
(81/121)*F827
(27/121)*F827
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