Hach 2100N Instruction Manual page 59

Tài li u sưu t m c a Trung Sơn - www.tschem.com.vn - 028.3811.9991 - info@tschem.com.vn
SECTION 5,
continued
Figure 15 Compression Fitting Connection
Note: Hand-tighten the
compression fitting nuts. Excessive
force may damage the fitting or cap
assembly (see Figure 17).
Figure 16 Suggested High-Pressure Installation
Tài li u sưu t m c a Trung Sơn - www.tschem.com.vn - 028.3811.9991 - info@tschem.com.vn
1. Connect ¼-in. O.D. tubing (of appropriate lengths for sample-in and sample-
out connections) to the inlet and outlet fittings on the cap assembly as
described in steps 1, 2 and 3 of Figure 15. The Flow-Cell cap fittings are
compression fittings suitable for ¼-in. O.D. polyethylene, metal, glass or clear
vinyl tubing. Clear vinyl tubing requires an internal tube support. Step 4 of
Figure 15 describes the method for removing tubing from this type of
compression fitting (shown in the cross-section drawing in Figure 17).
Figure 16 illustrates a suggested hookup using a pressure regulator in the inlet line
and a flow meter or flow control valve on the outlet line. The control valve is
installed on the outlet side because it may introduce bubbles into the sample
causing positive interference in the turbidity reading. This hookup also maintains
sufficient pressure to minimize outgassing in a carbonated stream.
59