10
8012707/ZVF9/V2-1/2019-04 | SICK
O P E R A T I N G I N S T R U C T I O N S | GM32
Subject to change without notice
2
PRODUCT DESCRIPTION
2.1.2
TRS calculation
Converting TRS physical units ppm <-> mg/m
3
●
TRS single components are conventionally oxidized thermally in the converter to SO
2
.
●
The SO
2
difference in ppm from measurement before and after correction results from
the TRS components.
●
The direct measuring method of the GM32 (without converter) is adapted to this
calculation convention.
●
Since the H
2
S share on TRS is > 80%:
The molecular weight of H
2
S serves as basis for converting the SO
2
difference to TRS in
mg/m
3
N.
Example:
●
SO
2
difference converter: 10 ppm = 15.18 mg/m
3
N
●
GM32 TRS measured value: 20 mg/m
3
N = 13.18 ppm
●
with H
2
S = 34 g/mol
--> 1 ppm H
2
S = 34000 mg/mol / 0.0224 m
3
N/mol / 1000000 = 1.518 mg/m
3
N
(under normal condition 0 °C).
2.1.3
Device variants
“Basic” variant
●
Reference cycle (
see “Reference cycle”, page 11
): Correction of internal drifts. Zero point
check.
●
Automatic mirror tracking: Automatic adjustment of optical axis.
●
Logbook: System messages are recorded in a logbook.
●
Network: Ethernet interface (Modbus TCP, SOPAS ET, OPC server).
“Pro” variant
As “
Basic
” variant. In addition:
●
TÜV performance tested for equipment subject to authorization (
→
Technical Data).
●
Check cycle,
: Reference cycle (as in the “
Basic
” variant),
followed by a cycle to check and output the zero and check point.
The check cycle creates the QAL3 values (quality assurance of automated measuring
systems). The QAL3 values can be displayed with SOPAS ET.
●
Operator panel: Measured values, operational state and malfunction messages are
displayed in clear text on a monitor.
●
QAL3 Tool (CUSUM chart).
