JP2008215826A - Holder for flow-through type ph electrode - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a holder for a flow-through type pH electrode having a simple structure, presentable inexpensively in large quantities, capable of measuring continuously even if flow speed of liquid to be measured flowing in a channel is changed, while an adjusting valve is not required to be arranged in a bypass route. <P>SOLUTION: In this holder for the flow-through type pH electrode arranged in series in the bypass route 7 branched from the channel 6 for conveying the liquid 3 to be measured, a measuring part 4 having a prescribed volume and having an inflow port 52 and an outflow port 53 to be connected respectively to the bypass route and an entry of a measuring part of the flow-through type pH electrode 1 is formed, and flow speed in the measuring part 4 can be set in a pressure range suitable for measurement by the flow-through type pH electrode 1 by adjusting a flow rate of the liquid 3 to be measured flowing out from the inflow port 52 in a fixed range by reducing a sectional area of the outflow port 53. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a holder for a flow-through pH electrode that can continuously measure the pH (hydrogen ion concentration) of a fluid using a small amount of liquid to be measured.

  Conventionally, flow-type pH electrodes capable of continuously measuring pH (hydrogen ion concentration) using a small amount of liquid to be measured have been proposed. For example, continuously measuring liquid to be measured flowing in a pipe. Is possible.

  FIG. 3 shows an example of a flow-type pH electrode that continuously measures a liquid to be measured flowing in a pipe that is currently in practical use. Usually, the flow-type pH electrode arranged in series in the pipe 2 is shown. Measurement is performed using a holder 5 in which a measurement unit 4 having a predetermined volume of the liquid 3 to be measured is formed with the sensor unit 11 of the electrode 1 exposed.

By the way, most commercially available flow-type pH electrodes 1 are capable of continuously measuring accurate values within a predetermined pressure range (for example, about 0 to 10 kg / cm ² ).

  Therefore, the transport speed of the liquid to be measured may be in a predetermined pressure range suitable for the measurement of the flow-type pH electrode 1, but the transport speed of the liquid to be measured is suitable for the measurement of the pH electrode 1 in a normal case. In many cases, the pressure range is exceeded.

  Therefore, in the conventional measurement using the flow-type pH electrode 1, as shown in FIG. 4, the bypass path 7 is branched into the flow path 6 for conveying the liquid to be measured, and the flow-type pH electrode 1 is connected to the bypass path 7. For example, a regulating valve 8, 8 such as a flow regulating valve, and a regulating valve 9 provided in the channel 6 are arranged on the upstream side and downstream side of the holder 5 of the bypass passage 7 in series. It was necessary to adjust the flow rate (contact pressure) of the liquid to be measured in the measurement unit 4 (see FIG. 3) of the holder 5 to a value suitable for measurement.

  The present invention has been made to solve the above-described problems, and the flow rate of the liquid to be measured flowing through the flow path 6 changes even though it is not necessary to arrange a regulating valve in the bypass path 7. It is an object of the present invention to provide a flow-type pH electrode holder that is not only capable of continuous measurement but also has a simple structure and can be provided in a large amount at a low cost.

  The present invention made to solve the above problems is a flow-type pH electrode holder arranged in series in a bypass path branched into a flow path for transporting a liquid to be measured, and is connected to the bypass path. A measurement portion having a predetermined capacity having an inlet and an outlet of the flow-through and an insertion port of the measurement portion of the flow-type pH electrode, and having a cross-sectional area of the outlet reduced and flowing out from the inlet By adjusting the flow rate of the liquid to a certain range, the flow rate in the measurement unit can be set to a pressure range suitable for the measurement of the flow-type pH electrode.

  By reducing the cross-sectional area of the outlet of the holder and restricting the flow rate of the liquid to be measured flowing out from the measurement section to a predetermined range, the measurement liquid in the measurement section is made to have a flow rate suitable for the measurement of the flow-type pH electrode. Allows continuous measurement. Further, it is not necessary to provide an expensive adjustment valve or control device in the bypass path.

  In addition, when the flow rate of the liquid to be measured at the outlet is reduced to 10% or less of the flow velocity at the inlet, the flow rate in the measurement unit in the holder of the liquid to be measured that is transported through the bypass path at a normal flow rate is circulated. It can be made suitable for measurement of a pH electrode.

  Further, when a speed reducing plate having a predetermined diameter is attached to the outlet, the flow velocity at the outlet can be reduced very easily and inexpensively.

  The present invention can reliably and continuously measure a liquid to be measured without requiring a plurality of regulating valves, a control device for these regulating valves, or the like in a flow path or a bypass path. In addition, the structure is simple and can be provided at low cost, and the conventional holder can be easily modified, so that it exhibits excellent economic cost.

  Next, the best mode for carrying out the present invention will be described with reference to the drawings.

  FIG. 1 and FIG. 2 show an example of the best mode of the present invention. The overall configuration is the same as that of the prior art shown in FIG. 3 and FIG. As a whole, it has a shape similar to a pipe connector having three ports, and is arranged in series in a bypass path 7 branched from a flow path 6 for transporting the liquid 3 to be measured.

  The holder 5 is formed with an attachment portion 51 for attaching the sensor portion 11 of the flow-through pH electrode 1 to the measurement portion 4 having a predetermined volume at the center top portion, and in the lateral direction. An inflow port 52 and an outflow port 53 that are connected to the bypass path 7 and allow the liquid 3 to be measured to pass through the measurement unit 4 are formed.

  Further, in the present embodiment, in particular, the speed reduction plate 10 having a small-diameter through-hole 101 formed at the center is disposed at the outlet 53 in the holder 5.

  In the present embodiment having the above-described configuration, the liquid to be measured 3 flowing through the flow path 6 is branched into the bypass path 7 and enters the measurement unit 4 from the inlet 52 of the holder 5. Usually, in the case of the conventional example shown in FIG. 3, it flows out of the outlet 53 at the same flow rate and joins the flow path 6 again.

  However, in the present embodiment, the speed reduction plate 10 having the through hole 101 having a smaller diameter b than the diameter a of the inflow port 52 is disposed at the outflow port 53. Therefore, the liquid 3 to be measured flowing out from the measuring unit 4 has a reduced cross-sectional area and a flow rate due to the through-hole 101 having a diameter d1 smaller than the diameter d2 of the inlet 52 of the speed reducing plate 10 disposed at the outlet 53. Therefore, by setting the diameter d1 within a predetermined range from the liquid pressure of the liquid 3 to be measured entering the measuring unit 4 from the inlet 52 and the set flow rate of the liquid 3 to be measured in the measuring unit 4, The flow rate of the liquid 3 to be measured flowing through the measurement unit 4 can be always constant.

  As described above, according to the present embodiment, the regulating valves 8 and 8 are arranged in the bypass passage 7 to control the flow rate like the conventional holder 5 in which the diameters of the inlet 52 and the outlet are equal as shown in FIG. There is no need to adjust over time.

  In addition, in the present embodiment, in order to reduce the cross-sectional area of the outflow port 53, the reduction plate 10 having the small-diameter b through-hole 101 is used as the outflow port 53 instead of reducing the diameter of the outflow port 53. Since the arrangement is very simple, assembly, maintenance and replacement are easy, and in particular, the conventional holder 5 shown in FIG.

  In particular, the through-hole 101 formed in the speed reducing plate 10 has a diameter such as that of a water pipe or a cover when the flow velocity of the damaged house liquid at the outlet is reduced to 10% or less of the flow velocity at the inlet. Including the flow path 6 and the bypass path 7 for transporting the measurement object at a predetermined liquid pressure, it is sufficiently included in the range of use for transporting a normal liquid measurement object.

  In this embodiment, the flow-type pH electrode 1 is used. However, the present invention can be applied to other flow-type electrodes such as an oxidation-reduction potential electrode that can perform the same type of measurement as the flow-type pH electrode 1. It goes without saying that it can be used.

(A) is the fragmentary longitudinal cross-sectional view which shows an example of the optimal embodiment in this invention, (b) is the BB sectional view taken on the line of FIG. 1, (c) is CC sectional view taken on the line of FIG. Schematic explanatory drawing which shows the use condition of embodiment shown in FIG. The fragmentary longitudinal cross-section which shows a prior art example. Schematic explanatory drawing which shows the use condition of embodiment shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Flow-type pH electrode, 3 Liquid to be measured, 4 Measuring part, 5 Holder, 6 Flow path, 7 Bypass path, 11 Sensor part, 52 Inlet, 53 Outlet, 10 Reduction plate, 101 Through-hole

Claims (3)

  A flow-type pH electrode holder arranged in series in a bypass path branched into a flow path for conveying a liquid to be measured, the inlet and outlet for connecting to the bypass path, and a sensor in the flow-type pH electrode A measuring section having a predetermined capacity having an insertion port of the section is formed, and the flow rate of the liquid to be measured flowing out from the inlet is adjusted to a certain range by reducing the cross-sectional area of the outlet. A flow-type pH electrode holder, characterized in that the flow rate in the measuring section can be set within a pressure range suitable for the measurement of the flow-type pH electrode.   The flow-type pH electrode holder according to claim 1, wherein the flow velocity of the damaged house liquid at the outlet is reduced to 10% or less of the flow velocity at the inlet. The flow-type pH electrode holder according to claim 1 or 2, wherein a flow velocity at the outlet is reduced by attaching a speed reducing plate having a through hole having a predetermined diameter to the outlet.

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