Vaisala DPT146 - Manual (Page 29)

Chapter 4 ________________________________________________________________ Installation
VAISALA ________________________________________________________________________ 27
When using DSC74, seal the threads of the quick connector or thread
adapter carefully with PTFE thread seal tape. Tighten with an open-end
wrench.
0507-105
Figure 14 DSC74 Sampling Cell with Accessories
where
1 = Thread adapter type G3/8" - G1/2"
2 = Thread adapter type G3/8" - G1/4"
3 = Quick connector
4 = Leak screw
5 = Sampling cell body (DMT242SC)
DSC74B Two-Pressure Sampling Cell
DSC74B and DSC74C sampling cells are enhanced versions of the
DSC74. The body is designed so that it is possible to measure at both
system pressure and atmospheric pressure.
DSC74B limits the flow rate with a fixed leak screw. The flow is
optimized for pressures 3 ... 10 barg. The fixed leak screw eliminates the
risk of opening the leak screw fully by accident and this way emptying a
gas vessel. The maximum flow can be increased, if needed, by removing
the leak screw and adjusting the flow manually with the valve. Harmful
gases can be recovered by connecting a collection system at the outlet
(not available from Vaisala).
In the basic operation of the DSC74B, the gas flows to the sensor from
the front and the outlet is on the side. To have the measurement done at