Thermo Scientific 082540, Product Manual

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2 – Installation
Thermo Scientific Product Manual for the ERS 500 Suppressor Page 24 of 84
031956-11 For Research Use Only. Not for Use in Diagnostic Procedures.
2.4 Back Pressure Coils for the Dionex ERS 500, Dionex ERS 500e and Dionex
AERS 500 Carbonate
All detector cells require enough back pressure to prevent eluent in the cell from out-gassing
due to abrupt volume changes between the small inner diameter of the connecting tube and the
relatively larger volume of the cell; out-gassing creates bubbles in the cell and disrupts detector
responsiveness. For example, carbonate eluent is suppressed to carbonic acid, which is CO
2
gas
in equilibrium with DI water, and CO
2
gas can come out of solution if adequate pressure is not
applied. The above out-gassing can trap bubbles in the cell causing high noise. Therefore,
Thermo Scientific Dionex recommends the addition of 30-40 psi of backpressure after the cell.
It should be noted that for RFIC hydroxide or MSA applications it may be possible to operate
the cell without backpressure. However, for carbonate and/or bicarbonate applications it is
highly recommended to install backpressure coils.
Back pressure coil components are shipped with your system. For 4 mm systems, locate
assembly Item # 045877. For 2 mm systems, locate assembly Item # 045878 (for 2 mm
systems, the backpressure coils are available in the microbore tubing kit, Item # 052324).
Alternatively, lengths and diameters of tubing necessary for proper back pressure are given in
Table 3, “Coils for ERS 500 Back Pressure Requirements.” Adjust the tubing length to achieve
a backpressure of approximately 40 psi.
If back pressure coils become damaged or plugged, they may cause irreversible damage to
the suppressor.
2.4.1 Assembly
A. Slip PEEK liquid line bolts and ferrules onto the ends of the tubing. Refer to Table 3,
“Coils for ERS 500 Back Pressure Requirements,” and determine the correct number of
coils required for your application based on the eluent flow rate.
B. After assembly of the coils, see Figure 5 The Auto Suppression Recycle Mode
Plumbing Diagram” for the proper placement of the completed coils and couplers
between the suppressor and the Gas Separator Waste Tube.
Table 3 Coils for Dionex ERS 500, Dionex ERS 500e and Dionex AERS 500 Carbonate
Back Pressure Requirements
ERS 500
Type
Item # Flow Rate I.D. of
Tubing
Length of
Each Coil Number
of Coils
4 mm 045877 0.5–1.5 mL/min 0.010” (Black) 2.5 ft. 2
4 mm 045877 1.5–3.0 mL/min 0.010” (Black) 2.5 ft. 1
2 mm 045878 0.12–0.25 mL/min 0.005” (Red) 1.0 ft. 2
2 mm 045878 0.25–0.75 mL/min 0.005” (Red) 1.0 ft. 1
The correct amount of back pressure for optimum operation is 40 psi. Back pressure over
450 psi after the Dionex
ERS 500, Dionex ERS 500e or Dionex AERS 500 Carbonate can
cause irreversible damage.
CAUTION
!
CAUTION
!