GE Kelman DGA900 - Service and Maintenance Procedures

MA-025 – DGA 900 Operator Guide – Rev 2.0 12-Apr-19 Page 41 of 92
6.11 Service
6.11.1 Measurement
Select Service > Measurement to open the Measurement Settings page as shown in
Figure 6-39. The Normalization Temperature is a thermostatically controlled internal target
temperature for the Analysis module. Depending on the region, one of two temperatures
can be set 0 °C or 20 °C.
Figure 6-39: Measurement Settings
The following Measurement Flags are available:
Nitrogen Enabled — displays measurement data for nitrogen. This also activates the
display of Total Dissolved Gases (TDG) (disabled by default).
TDG Enabled — lists the Total Dissolved Gases (TDG). Inactive if nitrogen measurement is
not enabled. TDG = H
2
+ CO
2
+ CO + C
2
H
4
+ C
2
H
6
+ CH
4
+ C
2
H
2
+ O
2
+ N
2.
TDH Enabled — lists the Total Dissolved Hydrocarbons. (TDH). TDH = CH
4
+ C
2
H
2
+ C
2
H
4
+
C
2
H
6.
Estimated Safe Handling Limit (ESHL) – expresses the concentration of gases contained
within the oil sample as a percentage. This is a safety indicator and is used to assess the
associated risk of the oil sample. ESHL = H
2
/LevelH
2
+ CH
4
/LevelCH
4
+ CO/LevelCO +
C
2
H
6
/LevelC
2
H
6
+ C
2
H
4
/LevelC
2
H
4
+ C
2
H
4
/LevelC
2
H
4.