Understanding Chromatographic Syringe Nomenclature

Most of us have used a syringe for introduction of samples into a chromatograph numerous times without bothering to understand its terminology and specifications. Such features specify its component parts and helps in making a correct choice for the desired application.

Let us familiarize ourselves with the nomenclature and specifications of syringes used in chromatography

Terminations

终端是指注射器桶和其针连接之间的界面。这里描述了常见的终端：

Cemented needle (N) or fixed needle (F)

The needle is cemented into the glass syringe barrel at a point coinciding with the zero graduation mark. Such syringes cannot be autoclaved.

可拆卸针（RN）

针可拆卸，以允许在零毕业标记处精确座位。用户可以选择选择针仪，长度和点样式。注射器可以在拆解时高压灭菌。

Knurled Hub (KH)

Used for high injection pressures up to 6000 psi. Provision is made for inclusion of spacer for repeatable depth injections. Autoclavable when dismantled.

PTFE Luer Tip (LT)

针头可拆卸，适合呈碎玻璃毂，其呈雄性鲁尔形状逐渐变细。它用于锁定鲁尔轮毂针和连接。注射器在拆卸时是可高压的。

Luer Tip Cemented针（LTN）

Needle is cemented into the glass syringe barrel at point corresponding to zero graduation mark. Dead volume is limited to the needle’s internal volume. Such syringes are not autoclavable.

PTFE鲁尔锁

The termination has a PTFE male luer tip with nickel plated brass locking hub which accepts and locks into place metal needles and universal connectors. Autoclavable when dismantled

Sample lock (SL)

Sample lock incorporates on/off valvel with RN. needle. Termination is used for headspace analysis, environmental sample collection and storage, pre-pressurisation of GC samples forGC分析。没有高压剥离。

Point styles

点样式选择有助于特定应用程序。

点样式2：sharp beveled needle for optimum septum penetration and minimum septum coring

点样式3：用于HPLC喷射阀的钝针点和样品移液

点样式5：孔/锥针与侧孔。填充液体样品并通过侧孔分配。隔膜的无牙损伤

Point style AAS :special conical needle point and used for auto sampler syringes.

不同应用中的点样式的最佳用途

GC injections –point style AAS extends the useful life of septa. Alternately point style 2 is also in common use.

HPLC注射-22 gauge, point style 3 needles are commonly used

Needle gauge

不同尺寸的尺寸尺寸适用于22至26和22s至26s的注射针。小s指定针的小内部体积。小s的针头具有较厚的侧壁，当使用自动进样器中的注射器时是一个有用的功能

Gauge	O.D（mm）	I.D（mm）
22	0.72	0.41
22s	0.72	0.15
23	0.64	0.34
23s	0.64	0.15
25	0.51	0.26
26	0.46	0.26
26s	0.47	0.13

下一篇文章将在适当使用，处理和照顾注射器的有用提示，长时间使用和结果准确性