JPS60230037A - Device for correcting measuring device detecting underwater oil trace - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Industrial Application The invention relates to a cuvette, a dosing station with six holes connected to the cuvette via a conduit, and a dosing station for measuring oil traces in water. The present invention relates to a device for calibrating a measuring device consisting of two conduits supplying test water and purified water to a station and a metering pump arranged in this purified water conduit.

Conventional technology Already, the test water and the "purified water'" as a reference medium have already been used for detecting traces of oil in the water.
A measuring device has been proposed, in which a water metering element with three holes arranged with respect to each other in a figure- or seven-shape is arranged and flows through the same cuvette; this cuvette is part of an IR absorbance measuring device. (West German patent application P3245
No. 510).

An electronic device connected to the measuring device directly displays the oil content of the water to be tested in ppm. In the case of IR measurements, there is no absolute method, so the measuring device had to be calibrated with an oil/water mixture.

This is fully possible if the measuring device is manufactured industrially. In this case, a predetermined amount of oil enters the main water pipe in front of the main pump! 1 The amount is mixed into the water using a special metering pump.

The expensive metering pump is not a component of the actual measuring device.

Problem to be Solved by the Invention The problem underlying the invention is to create a calibration device for a measuring device of the above-mentioned type, which can be integrated into this measuring device and can be easily operated by the user. .

Means for Solving the Problem According to the present invention, this problem is solved in the above-mentioned calibration device by:
Before the metering pump, the conduit of the container containing the reference solution is connected via a six-way tap to the purified water conduit, and in order to calibrate the measuring device, the line of the container containing the reference solution is connected to the dosing station via the purified water conduit instead of the purified water. The solution is provided by an arrangement in which a reference solution is metered in and the metering station is supplied with oil-free test water instead of oil-containing test water via a test water line.

Advantageous embodiments of the invention are listed in the dependent claims.

Effects □ In particular, the advantages obtained by the invention are that the reference solution is absolutely homogeneous and extremely precise, can be stored for any period of time and has good transportability, and can be adjusted to any oil content. . Furthermore, the device is extremely simple to use for the user, so that calibration can only be carried out by unskilled personnel.

Example In the following, the invention will be explained in detail with reference to drawing examples.

A measuring device for detecting oil traces in water is known per se.
R absorbance measuring device 201 Components cuvette 1, water dosing member 3 with three interconnected holes 4,5.6 forming dosing station 7, metering pump 8 and conduits 9,10°11 and 12. A conduit 9 connects the bore 6 of the dosing member 3 to the cuvette 1;
receives the oil-containing test water flowing through the conduit 10 in the direction of the arrow 14 in the conduit 13, and this test water is supplied from the conduit end 15 to an ultrafilter (not shown), which purifies the purified water. 16 is supplied via a line 11.11' to the metering port 8, which metering pump is connected via a line 11'' to the bore 5 of the metering station 3; line 12 is a drain line.

During the measurement, test water 14 flows continuously through the cuvette 1 via conduit 10, and purified water 16 (reference water) obtained from the test water using ultrafiltration is passed through the cuvette 1 at a predetermined cycle time. Subsequently, metering station T is reached by metering pump 8.
The injection is introduced inside. If the pump pressure of the metering pump 8 is greater than the pressure of the test water 14, the test water is displaced by the reference water front, thus resulting in two water fronts that are alternately successive in the cycle of the metering pump 8. .

For the purpose of calibrating the measuring device, a container 22 containing a reference solution 21 is provided together with a conduit 20, which is connected in front of the metering pump 8 via a six-way tap 23 to the purified water conduit 1i.
, connect to i i'.

To calibrate the measuring device, three
The tank 23 is such that the purified water 16 is blocked in the conduits 11', 11'' and the reference solution 21 is blocked in these conduits 11'.
1', 11" into the metering station γ by means of a metering pump 8; during the calibration process, oil-free water is led in the direction of the arrow 14 through the main pipe 13. The water to be tested is then supplied to the cuvette 1 via the conduit 10.

Since the reference solution 21 is introduced in place of the reference water 16 and oil-free water is used in place of the oil-containing test water, an electronic calculation device (not shown) connected to the R absorbance measuring device 2 is used. A signal is produced in which the absolute value is the same but with a negative sign (for example -700 ppm is displayed on the output device instead of 700 ppm).

The sensitivity factor of the measuring device is changed in such a way that the absolute value of the input signal corresponds to the reference solution. It is particularly advantageous to obtain the target dilution of the reference sandal (for example alcohol) using oil-free water used in the calibration process. This can be done in a simple way by replenishing the reference sample taken to the instrument with oil-free water up to a predetermined mark, as is customary in the field of analytical chemistry. can be achieved.

The solution thus produced is loaded into the container 22.

[Brief explanation of the drawing]

The drawing is a schematic diagram showing an embodiment of the device according to the invention. 1 cuvette, 2 ・IR absorbance measuring device, 3...
Water metering member, 4, 5.6... hole, 7. metering station, 8 - metering pump, 9, 10, 11゜12... conduit, 13... main pipe, 14-... test water , 15...Pipe end, 16.Purified water, 20.Reference solution conduit, 21..Reference solution, 22..Reference solution container, 23.3-way pot

Claims (1)

[Claims] 1. A cuvette (1), a conduit (9) to this cuvette
a dosing station (7) with holes (4, 5, 6) connected via the dosing station and to this dosing station the water to be tested (
14) and two conduits (1) supplying purified water (16).
0;11,. 11', 11") and this purified water conduit (
11, 11', 11").
), in front of the metering bonder (8), a container containing a reference solution (21);
The conduit (20) of (22) is connected to the purified water conduit (11') via a six-way socket (23) and to the metering station (7) for calibrating the measuring device.
', 11'') and the reference solution (16) instead of the purified water (16).
21) is installed and the distribution station (7)K
, oil-containing test water (14) via the test water conduit (10)
A device for calibrating a measuring device for detecting traces of oil in water, characterized in that test water containing no oil is supplied instead of the test water. 2. The device for calibrating the detection and measurement device for oil traces in water as set forth in claim 1, wherein the reference solution (21) is an aqueous solution of an IR-active organic compound with a wavelength of 6.4μ. 3. The device for calibrating a measuring device for detecting traces of oil in water according to claim 1, wherein the reference solution (21) is an aqueous alcohol solution.