To install a sample probe, use an existing full-port gate valve, or weld a half-coupling on the
process line and attach a 7.6 cm (3") long schedule 160 nipple and gate valve, then hot-tap into
the process line. The probe can then be attached to the gate valve by a reducing bushing and
a suitable packing gland. Refer to Application Drawing Package, Block Diagram Utility
Connections sheet and Sample Probe sheet.
The sample probe should be long enough to be inserted to the process pipe's centerline, or at
least 10 cm (4") past the process pipe's inside wall. The probe should be cut off at the valve end
to leave a maximum of 2.5 cm (1") of tubing between the packing gland and the shut-off valve
when the probe is fully inserted. This decreases the chance of bending or breaking off the probe
tube.
Additional Equipment
Additional equipment associated with the probe, such as a regulator and vaporizer, if required,
is attached with a U-bolt bracket connected around the 3” (7.6 cm) long nipple upstream of the
process gate valve. Refer to Application Drawing Package, Block Diagram Utility Connections
sheet and Sample Probe sheet.
Transport tubing will be specified in the Application Drawing Package, Block Diagram Utility
Connections sheet.
Figure 3-14 Typical Installed Sample Probe
Transport tubing is typically 6.35 mm (¼“) O.D. for gas samples, and 9.53 mm (⅜“) O.D. for
liquids. Leave plenty of extra tubing to reach the connection points. The stainless steel tubing
must be very clean and dry. If in doubt, flush it with an appropriate substance (such as high
purity methanol) and dry it with an inert gas. Cap the open tubing ends to prevent contamination.
Installation Steps
3.7 Sampling System Installation
Installation Manual
32 Installation Manual, 12/2019, 2000595 Rev 1
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