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C
OMMISSIONING
7.2.3
Checking the Operating Points
54 / 146
The density monitor is temperature-compensated. The ambient
temperature does not affect the indication or the operating points.
For a check of the operating points, only the gas piping is filled with
gas. The pole column connections for the gas piping are equipped
with check valves. The check valves prevent uncontrolled gas
leakage.
The density monitor has two operating points:
- UW1: Alarm. This signals gas loss, but the circuit breaker re
mains ready for operation.
- UW2: Lockout. Severe gas loss is indicated, and switching ope-
rations are prevented by the electrical control system.
- ND:
Rated pressure.
• Unscrew the protective cap from the central supply connection.
• Connect the filling hose of the gas-filling device to the central
supply connection (type DILO DN8 coupling; the location of the
gas-filling device is shown in the dimensioned drawing).
• Fill the gas piping with SF
The rated pressure is marked by the black dot on the indicator
dial.
• Disconnect and remove the filling hose.
• Connect a device suitable for discharging and collecting SF
such as the SF
Multi-Analyzer manufactured by DILO Armaturen
6
und Anlagen GmbH - to the central supply connection.
• Connect the multimeter to the terminals for UW1 in the operating
mechanism.
• Slowly reduce the gas pressure in the piping until UW1 is
reached. As you do so, compare the electric operating point with
the density monitor indication.
• Connect the multimeter to the terminals for UW2.
• Reduce the gas pressure further until UW2 is reached. As you do
so, compare the electric operating point with the density monitor
indication.
OI 250 (EN)
UW2
UW1
ND
until rated pressure (ND) is reached.
6
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6
REV7
/REV6
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