Instruction manual

4.0 PIPING SM425 INSTRUCTION MANUAL
Figure 4-12 Manufacturing Blow pipe
4.4 Piping for the Detector with Pressure Compensation
SM425P----P Detector with Pressure Compensation may be used in System 2 and System 3.
However, it cannot be used with the high-temperature probe adapter or blow back piping. Use this style
detector whenever the process pressure exceeds 5 kPa (see Note). The detector makes accurate
measurements at high process pressures by using instrument air to adjust the probe’s internal pressure
to equal the process pressure. To accomplish this, the pressure of the instrument air supply must be
higher than the process pressure.
The detector with pressure compensation is illustrated in Figure 4-13.
Process gas pressure should be relatively stable.
42500001 REV A 77