Buhler GAS 222.20 DH, Assembly, Installation And Operation Instructions

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GAS 222.20 DH
4.6.1 Connecting the Gas Line
Please note the following items when connecting the sample gas line (NPT 1/4") on heated probes to prevent thermal bridges:
– Choose the shortest possible screw connection.
– Shorten the connection pipe for the sample gas line as much as possible. To do so, remove the insulation around the sample
gas line.
CAUTION Fragile
The insulation is fragile. Handle with care, do not drop.
Proceed as follows:
– Remove cover piece.
– Remove the two cap nuts from the insulating washer, then remove the insulating washer.
– Remove the four retaining screws for the insulation.
– Slightly tip the right half-shell and remove to the top. The left half-shell does not need to be moved to make the connection.
– Install the screw connection with sealant, then connect the sample gas line using an open ring spanner.
– Reinstall the right half-shell. When doing so, be sure the steam pipe is in the bottom slot in the half-shell.
– Secure the insulation with the four retaining screws.
– Attach the insulating disc, put on the two cap nuts and tighten carefully.
– Install the cover piece.
After connecting the sample gas line it must be braced and secured with the clamp.
Long sample gas lines may require additional support clamps along the way to the analysis system! Once all lines have been
connected and checked for leaks, carefully reinstall and secure the insulation.
WARNING Gas emanation
Sample gas can be harmful to the health!
Check the lines for leaks.
4.6.2 Connecting the calibrating gas line (optional)
Connecting the calibrating gas line requires a Ø6 mm or Ø1/4” pipe fitting.
If the calibrating gas connection was ordered with check valve, a Ø6 mm or Ø1/4” pipe can be connected directly to the check
valve.
4.7 Connecting the Steam Heating
Carefully and properly connect the lines to the existing screw connections. Ensure adequate thermal insulation to prevent injur-
ies.
DANGER Explosion hazard due to high liquid temperatures
Hot steam and hot sample gas cause in a high probe surface temperature. The highest
fluid temperature is approximately the maximum probe surface temperature.
a) Always ensure a safety clearance of at least 20 K between the fluid temperature
(steam, sample gas) and ignition temperature of explosive atmosphere (by measur-
ing and monitoring the temperature).
b) Also be sure to stay well below the smouldering temperatures of dust.
c) Observe the relevant requirements in standards regarding the max. permissible sur-
face temperature and ignition temperature of explosive atmosphere.
9 Bühler Technologies GmbH BE460045 ◦ 10/2019