FLK Gas Sampling System - MPIP - Free

SQ250 FLK Gas Sampling System
If faults occur during insertion, then the probe must automatically withdraw after the insertion button is released. Insertion of
the probe can only be restarted after rectification of these faults.
Note:
The probe must first be inserted manually and also after each retraction due to a fault.
Some faults must be simulated to test the safety functions. This should be carried out at the point of their acquisition if
possible. The red fault lamp flashes for each fault (exception: probe not on automatic) and after acknowledgement it becomes
continuously illuminated. The associated text appears on the display of the OP3 Operator Panel.
Since a safety interlock is involved here (danger of overheating the probe and coolant), these functions should be tested in
"Automatic" and "Manual" modes.
Caution:
When simulating the faults on the heat exchanger unit, particular care should be taken that, for
example, with a fault on the coolant flow, overheating of the probe and damage to it cannot occur.
• The automatic retraction of the probe with electrical and pneumatic drives occurs with the following faults:
- Supply to heat exchanger
- Supply to heated filter
- Fault on coolant blower
- Coolant flow < min. (time-delayed)
- Coolant level < min.
- Overtemperature > 220 degrees (time-delayed)
- Coolant pump switched off
- Limit switch fault, four-way ball valve
- Position error, four-way ball valve
- Limit switch fault, probe inserted
- Time exceeded during insertion / retraction
• The automatic retraction of the probe with pneumatic drive occurs with the following faults:
- for power failure
- for protective tripping of the power supply to the PLC
- tripping of the motor protective switch for the probe drive-motor
If damp penetrates into the coolant due to the condensate or other effects, sudden gas bubble formation may occur when the
coolant is heated, causing interruption of the flow and therefore retraction of the probe. This occurs mainly at temperatures of
approx. 125°C. At approx. 200°C...240°C vaporization of the coolant may occur. Therefore, the coolant fluid must be
subjected to these ranges during the initial start-up. The following procedure has proven suitable for obtaining these critical
points:
• Slightly open the cover of the expansion vessel;
• Slightly open the venting tap for the pump and cooler;
• With the pump running, briefly open the venting container. While doing this, hold the collection container under the
outlet;
• When the probe withdraws due to interruption in the flow, immediately start the pump again;
• After rectification of the fault, immediately insert the probe again;
• Close the venting tap on the cooler;
• Close the cover on the coolant expansion vessel.
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