DE2442943A1 - Viscosity meter using vertical tubes - includes washing, drying and filling arrangement for a capillary viscosity meter - Google Patents

Abstract

The viscosity meter has a washing, drying and refilling arrangement, which comprises valves, pipes, joints and a suction tube, by means of which the solvent and the test sample is sucked away. After washing and drying of a tube extending to the lowest level, the test sample is brought into the meter by the aid of air pressure and suction and the correct level is controlled with the aid of a tube which extends only to the upper end of the sample bulb. The procedure for emptying the sample, washing the tube, drying and refilling is made automatic by the use of an electric programmer between the valve arrangement and the timing relay.

Description

Viscometer washing and filling automatic system The invention relates to a Viscometer washing and filling.

automatic system that allows capillary viscometers such as B.

of the Ubbelohde type to empty, clean, dry and to be refilled with the sample to be measured, with the capillary viscometer in the thermostat can remain.

The purpose of the invention is to use the existing and known methods to expand the viscosity measurement by an automatic washing and filling system and to combine that with commercially available viscometers such. B. Dyp Ubbelohde can be worked efficiently.

So far, only Ubbelohde viscometers are known for cleaning Manual methods customary in the laboratory, whereby the viscometer to be cleaned is selected in each case The thermostat must be taken out, then individually with wash bottles and solvents to be cleaned and dried; This method is disadvantageous in that the capillary viscometer when removed from the thermostat and the transport to the washing area are at risk of breakage and also for a longer period of time Time to measure is not available. The subsequent filling of the viscometer with the sample requires additional filling vessels and manual dexterity when measuring the filling quantity.

The invention is based on commercially available capillary viscometers such as B. Ubbelohde, which can remain in the thermostat, and a program-controlled Valve and hose system to carry out efficient washing, filling and measuring.

This object is achieved in that the tubes of the Viscometers can be freely plugged in via sleeves or firmly connected via hoses and program-controlled valves are supplied with solvents, are sucked off, rinsed and dried, and then re-filled with the appropriate filling quantity to be filled, being specially designed for the lower curvature of the viscometer suitable suction pipe introduced adjustable via a sealed sliding passage so that the lowest point of the viscometer (curvature) is reached and it is ensured that the solvent or sample residue is sucked off, whereby after drying the viscometer with compressed air, this trunk can also be used as a filling tube serves, the valves are switched accordingly and the sample is sucked in or is pumped in.

The filling quantity can either be via hose connections from one Dosing vessel (e.g. 12 ml) added or after a rough filling by suction using a second suction pipe can be extracted to the correct level.

In addition, suitable connection plugs can be used on the hose connections the washing system on the 3 tubes of the viscometer a pneumatic unit for the Repeating the measurements of the sample are connected, with the electrical Shortcuts and the program for measuring, washing and filling runs automatically.

The advantages of the described viscometer washing and filling automatic are in particular that with rubber closures to connect the washing - and filling unit with the viscometer, these remain in the thermostat can and also an efficient and solvent-saving washing of capillary viscometers such as z. B.

after Ubbelohde becomes possible. Also, adding the Filling process and the possibility of control by repeating pneumatics for the repetition of the measurements a fully automatic determination of the viscosity using a capillary viscometer such as B. Ubbelohde enables.

Embodiments of the invention are given below with reference described in more detail in the accompanying drawing.

Pig. 1 shows a block diagram of the viscometer washing and filling system, the capillary viscometer (1) via hoses and connector (2) connected to the valve device (5). The suction tube (3) protrudes to the bottom Curvature of the viscometer so that both the sample to be emptied and the Solvent or residues can be sucked off. Through an appropriate program The valves in the valve unit (5) are controlled by the valve control unit in such a way that that solvent is supplied via vacuum or compressed air and the waste mixture is sucked off will. There are all 3 tubes of the viscometer (1) one after the other and, if necessary, several times cleaned repeatedly and then dried.

Via the suction pipe (3), with appropriate control of the valve device (5) and with the help of the second suction pipe (4) are filled in a defined manner.

By combining the valve device (5) with a timing device (6) and a measurement query (7), fully automatic operation can be achieved.

Claims (3)

Claims 1. Automatic viscometer washing and filling system for capillary viscometers d a d u r c h e k e n n n z e i c h -n e t, aass the capillary viscometer (1) by means of hoses and connectors (2) and a suction pipe (3) that extends up to protrudes to the lower curvature of the viscometer, via appropriately controlled Valves and is connected to solvents via compressed air or vacuum, whereby through the suction tube (3) both the sample to be emptied and the solvent residues be sucked off. 2.) Viscometer washing and filling automatic according to claim 1, with a suction tube (3) utilizing vacuum: n or compressed air and the corresponding Valve control program d a d u r g e k e n n n n e i c h n e t that for filling of the viscometer (1) after the washing and drying process via the suction tube (3 ) the new sample can be introduced with compressed air or vacuum, and by means of a 2nd suction pipe (4) is brought to the correct filling level (amount). 3.) viscometer washing and filling automatic according to claim 1, d a D u r c h e k e n n n n z e i c h n e t that via corresponding electrical control lines a fully automatic operation with between the valve device (5) and the timing device (6) Filling, eating (7) and washing can be done.