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Hydraulic components, Description, Valve – Gilson 402 User Manual

Page 23: Tee junction, Syringes

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Description

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Hydraulic Components

Valve

The two-position valve, which is fitted to the left-

hand side of the 402, has three ports. It switches

the syringe port to either the reservoir or to the

probe side (see opposite figure).

The valve, which has a 0.5 sec rotation period, is

driven by a stepper motor. It is designed to with-

stand a million rotations, when used with water.

The liquid contact surfaces of the valve, which is

autoclavable, are in PEEK and ceramic (121°C,

0.1 MPa, 20 min).

Tee Junction

The Tee-junction, which is fitted to the right-hand

side of the dual-syringe model, has three ports: the

inlet from the valve, the outlet to the probe, and the

syringe port (see opposite figure).

The Tee-junction, which has no internal moving

parts, includes 2 channels, each 1.5 mm in diam-

eter oriented at 120°. The liquid contact surfaces of

the Tee-junction, which is autoclavable, are in PEEK.

Syringes

The choice of syringe allows the 402 Dilutor-Dispenser

to handle volumes from 1 µL to 25 mL with low

values of systematic and random error. The 402

Dilutor-Dispenser is able to transfer liquid as

follows:
- from 1 µL to 10 mL from the probe (transfer

tubing volume of up to 10 mL),

- up to 25 mL from the reservoir, in one stroke,
- up to 99 mL from the reservoir, in several strokes.

When using the Dual-syringe model, a theoretical

dilution ratio of 1/25000 is achieved in one stroke

of both sample and diluent syringes. However, you

are advised not exceed a ratio of 1/500 for any

given dilution, in order to stay within the RSD

range (after efficient mixing).

Hydraulic Components

From reservoir

Probe (or Tee
junction)

To waste

Syringe

From Valve

To Probe

Syringe