DE3041681A1

DE3041681A1 - Temp. regulation for analytical measurement - using aluminium block with container holes, acid drainage channels and heating plate

Info

Publication number: DE3041681A1
Application number: DE19803041681
Authority: DE
Inventors: Antrag Auf Nichtnennung
Original assignee: Individual
Current assignee: Individual
Priority date: 1980-11-05
Filing date: 1980-11-05
Publication date: 1982-06-09

Abstract

A method of temp. adjustment of several samples for certain analytical processes if pref. for CSB measurement. It eliminates the problem of temp. fluctuations conventionally experienced once the desired temp. has been reached. Facilities are provided for drainage of spilt acid. The sample containers are placed in holes bored through a block of material, pref. aluminium, of good thermal conductivity. The block is heated from below a special heating plate in direct contact bath with the block and the containers. The arrangement results in both direct and indirect heat transfer. The block contains special channels which carry away acid safely if container defects occur. The acid is fed to a special outlet for decontamination. The number of containers can be varied as required but is pref. 6,12 or 24.

Description

gefahrlose Temperaturnivellierung bei der CSB-BestimmungSafe temperature leveling when determining COD

Zum Stand der Technik gehören heute Heizthermostaten zum Einsatz auch bei der CSB-Bestimmung, bei welchen ein mit Heizstiften versehenes Blockelement aus einem gut wärmeleitenden Material gebohrte Vertiefungen zur Aufnahme der Probenbehälter enthält Die Nachteile dieser Apparaturen bestehen einmal darin, daS die Wäreleitting relativ lange Zeiten beansprucht.Heating thermostats also belong to the state of the art today in the COD determination, in which a block element provided with heating pins Wells drilled from a material that conducts heat well to accommodate the sample container The disadvantages of these apparatuses are, on the one hand, that the heat conduction used relatively long times.

Gleichzeitig besteht bei den hohen Temperaturen die efahr, daß bei Defekten an den Probebehältern Säure in den Vertiefwngen steht und zu Spritzern führt, die vor allem das Augenlicht bedrohen.At the same time, there is a risk that at the high temperatures Defects in the sample containers Acid stands in the wells and splashes which especially threaten the eyesight.

Weiterhin ist es von Nachteil, daß bei erreichen der Soll-Temperatur diese nicht konstant gehalten werden kann, da die Temperatur durch Ein- und Ausschalten von der jeweils vollen Heizleistung doch sehr schwankt.Another disadvantage is that when the target temperature is reached this cannot be kept constant because the temperature is switched on and off from the respective full heating power fluctuates a lot.

Als technische Neuerung wurde daher Heizelement und Block getrennt, der Block selbst erhielt durchgehende Bohrungen, so daß nun die Probenbehälter direkt auf der unter dem Block liegenden Jpezialheizplatte stehen und somit nicht nur indirekt sondern auch direkt beheizt werden. (Abb.1).As a technical innovation, the heating element and block were separated, the block itself received through holes, so that now the sample container directly stand on the special heating plate below the block and therefore not just indirectly but can also be heated directly. (Fig.1).

Gleichzeitig konnte durch die Trennung in Heizung und Blockelement das letztere mit Dränage-Vertiefungen zur gefahrosen Ableitung von verschütteter Säure bestückt werden. (Abb.2).At the same time, the separation into heating and block element the latter with drainage depressions for the dangerous discharge of spilled water Acid. (Fig.2).

Weiterhin wurde als technische Neuheit eine temperaturgesteuerte Thermostatisierung mit verringerter sprich gebremster Heizleistung eingebaut, um so den Zeitpunkt der Leistungsreduzierung einerseits optimal zu erfassen und andererseits die Heizleistungsreduktion optimal auszulegen. So erzielt man eine erhöhte Temperaturkonstanz durch Minimierung der Temperaturkurvenausschläge. Atjb. 5).A temperature-controlled thermostat was also a technical innovation with reduced, i.e. braked, heating power built in, so the timing of the On the one hand, optimum recording of power reduction and, on the other hand, the reduction in heating power to be optimally designed. In this way, an increased temperature constancy is achieved by Minimization of the temperature curve deflections. Atjb. 5).

Durch diese technischen Feuerungen und Verbesserungen des Verfahrens wurde die CSB-Bestimmung gefahrloser, schneller und energetisch optimaler gestaltet.Through this technical furnace and process improvements the COD determination was made safer, faster and more energetically optimized.

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Claims

Method for optimal temperature setting a> r or several samples for certain analytical processes, preferably for COD determination, marked --- net in that a block element made of a material that conducts heat well, preferably aluminum, corresponding wrch4eh through holes are provided for The sample container is taken up and heated from below by means of a special heating plate, which contacts both the block element and the bottoms of the sample containers directly and thus the heat transfers both indirectly and directly, and that there are special channels contains the safe drainage of acid in the event of defects in the sample container serve, whereby the acid is collected and decontaminated in a special drain can be. (Fig. 1 and 2).

2. experience according to claim 1, characterized in that the number the sample container can be adapted to requirements, but preferably 6, 12 or 24 is.

3. The method according to claim 1 and 2, characterized in that by specific switching elements and temperature control sensors after reaching the desired Temperature, an automatic heating output throttle occurs to prevent fluctuations the temperaLur in the COD sample containers are greatly smoothed, thus reducing the error rate to reduce. (Fig.3).

4. Device for temperature setting for COD} determination with element block, preferably made of aluminum, with a corresponding number of through holes and with a heating plate, which has special drainage channels to reduce the risks Has acid splashes, and with a special, temperature-controlled heating power setting device for one or more sample containers, preferably 6, 12 or 24. (Fig.1,2,3).