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MODEL CLARITY II
2.3 INSTALLATION — DEBUBBLER ASSEMBLY
See Figure 2-4 for installation.
Connect the sample line to the inlet fitting. The fitting accepts 1/4-inch OD tubing. See Section 2.6 for recom-
mended installation of the sample port.
Attach a piece of 3/8 inch ID soft tubing to the drain fitting. The debubbler must drain to atmosphere.
During operation, the debubbler is under pressure. A 0.040 inch (1 mm) orifice in the outlet pro-
vides the pressure. Back pressure helps prevent outgassing, which can lead to bubbles accu-
mulating on the sensor face resulting in erroneous readings. DO NOT EXCEED 30 psig (308
kPa abs) inlet pressure.
The amount of pressure in the debubbler can be estimated from the flow rate. See Table 2-1.
To control and monitor sample flow, a valved rotameter with fittings is available (PN 24103-00). Attach the
rotameter to the debubbler outlet. The rotameter can also be used to increase back pressure on the debubbler if
additional pressure is needed to prevent outgassing.
BEFORE REMOVING THE SENSOR, be absolutely
certain the process pressure is reduced to 0 psig
and the process temperature is at a safe level.
TABLE 2-1. Approximate debubbler pressure
as a function of flow (0.040 inch outlet orifice)
gph
psig
2
1
4
3
6
8
8
14
10
21
11
26
12
31
—
—
NOTE
CAUTION
mL/min
100
200
300
400
500
600
700
800
kPa abs
110
120
140
160
190
240
280
340
SECTION 2.0
INSTALLATION
7
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