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fann440型污泥毛细吸水时间测试仪CST（CapillarySuctionTime）

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名称：污泥毛细吸水时间测试仪

污泥毛细吸水时间测试仪产品

CST（Capillary Suction Time）的测试是表现污泥过滤性和状态的一个快速和可靠的方法，它于1970年起已被国外广泛应用。污泥的过滤性影响着几乎所有不同类型的脱水设备的输出量，这些设备包括：干化床，压带机，真空过滤器，压滤机和离心分离机等。

通过标准滤纸产生的毛细吸水压力用于从污泥中“吸收”水分，水分渗入滤纸的速率的改变依靠污泥的状态和在滤纸上形成的纸饼的过滤性，CST测试仪从漏斗上的两个以标准间隔放置的电极上获取。得到的从开始到通过这两个电极间的时间即为CST。

在漏斗中通过毛细吸水产生的力量远远大于流体静压的顶点，所以测试不依赖污泥的数量。只要有污泥就可产生CST。
污泥毛细吸水时间测试仪产品特点：
1.便携式
2.位于CST测试仪顶部的AC开关可增强寿命和可靠性
3.易用的PP3 9V电池可连续使用约100小时
4.LCD显示
5.音响显示使用，停止和故障状态
6.仪器和附件放置于一个坚固的塑料箱中
7.仪器的设计和测试遵循欧洲和美国EMC标准
箱子尺寸：33×26×5.5cm
产品重量：1.75kg
污泥毛细吸水时间测试仪组成部分：
CST测试仪
有机玻璃组件装置和不锈钢漏斗
专用滤纸1盒（100张）
备用的PP3 9V电池

CAPILLARY SUCTION TIMER (CST)

#294-50

The Capillary Suction Timer (CST) principle was developed at the Water Pollution Research Laboratory in Stevenage, England, for studying the filterability of sewage sludge and for evaluating the effects of pre-treatment chemicals and process conditions of sewage treatment. It has been widely used to study the colloidal properties of clay suspensions. The petroleum industry uses the CST to characterize shales and to optimize the electrolyte con- centration in drilling fluids for minimizing its effect on shale forma-tions.

CST studies of filtration characteristics of aqueous systems utilizethe capillary suction pressure of a porous paper to affect filtration.When a suspension is filtered under the influence of this suction

pressure, the rate at which filtrate spreads away from the suspen-sion is controlled predominately by the filterability of the suspen-sion. The CST automatically measures the time for the filtrate to

advance between radially separated electrodes when a fixed areaof special filter paper is exposed to the suspension.

The CST consists of two separate components - the acrylic filtra-tion unit with the electrodes and a timer. The method is rapid and easy to use. A sample of the aqueous system to be tested is

placed in the sample cylinder and the suction pressure of the filter paper beneath the sample draws out the filtrate. The filtrate progresses radially in an essentially elliptical pattern with the timer starting when the liquid reaches the first pair of electrodes. When the liquid reaches the third electrode, the timing ceases, the finish lamp comes on, and an audible signal is sounded. The CST reading is indicated on a 6-digit LCD counter indicating to tenths of a

second.

The complete instrument consists of a timer case, test head, and stainless steel cylinder (1 cm diameter on one end and 1.8 cm onthe other). It is powered by a 9-volt battery and features a “Low Battery” indicator light. Other components include an on/off switch and a reset button for resetting the circuits. The instrument uses

The following are non-exclusive examples of a variety of industrial processes where the CST instrument is used to evaluate chemicals (e.g. polymers):

Wastewater Treatment

- Mechanical dewatering of thickened slurries from sedimenta-

tion basins and filter backwash

- Conditioning of surface and subterranean water in potable

water

- Clarification of filter backwash water and thickening of

hydroxide slurries from sedimentation basins

Sewage Plants

- Dewatering of raw sludge, digested sludge, and waste-acti-

vated sludge on drying beds, rotary vacuum filters, vacuum

belt filters, decanter centrifuges, and plate/frame filter

presses

- Thickening of biological sludge prior to addition of primary

sludge

- Thickening of sludge in Dissolved Air Flotation (DAF) sys-

tems

- Improving separation efficiency in mechanical pre-clarifica-

tion processes

Petroleum Industry

- Borehole stabilization to determine the best electrolyte and

polymer to use for maximum shale swelling inhibition

- Evaluating colloidal shale properties to study the reduction of

permeability of the formation around the wellbore

- Evaluating the effects of soluble salts and polymers on cut-

tings

There are many other uses for this versatile instrument in minerals

processing, the coal mining and quarrying industries, and the

potash, metal, paper, and sugar industries.

Size: 10" × 4.75" × 2" (25 × 12 × 5 cm)

Weight: 1 lb 8 oz (.68 kg)

Components:

#294-50-004 Spacer, Nylon

#294-50-006 Cable Connector

#294-50-007 Battery Connector

#294-50-008 Push-Button Switch, Red

#294-50-009 Case

#294-50-010 Upper Block

#294-50-011 Lower Block

#294-50-012 Electrode

#294-50-013 Support Rod

#294-50-014 Terminal Cover

#294-50-015 Power Supply

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