JPS5928355Y2 - Immersion type pH transmitter - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an immersion type pH transmitter in which an electrode part placed in a liquid to be measured and a main body placed outside the liquid to be measured are connected by a pipe.

In conventional immersion type pH transmitters, the air inside the electrode section often contains a large amount of water vapor or condenses due to breathing effects due to temperature fluctuations or incomplete sealing.

For this reason, inside the electrode section, which is required to maintain a highly insulated state,
Insulation deterioration occurred and measurement errors occurred.

An object of the present invention is to provide an immersion type pH transmitter that does not suffer from such insulation deterioration.

The present invention will be explained in detail below using the drawings.

FIG. 1 is a configuration diagram showing an embodiment of the immersion type pH transmitter according to the present invention.

In FIG. 1, 1 is an electrode section disposed in the liquid to be measured;
2 is a main body disposed outside the liquid to be measured; 3 is a pipe connecting the electrode section 1 and the main body 2; and 4 is an air purge joint that is threadably connected to the main body 2.

A cross section of the air purge joint 4 is shown in FIG.

In this FIG. 2, 41 is a cylindrical body having a hole 411.

A ventilation hole 41 is provided in the thick part of the body 41 and passes through it.
2 is formed.

Furthermore, an annular groove 413 is formed on the outer surface of the body 41 in order to widen the opening of the ventilation hole 412.

Further, a threaded portion 415 is formed between the end face 414 and the ventilation hole 412 for connecting the entire joint to the main body 2 of FIG.

In addition, three types of threaded portions 41 are provided in the hole 411 of the body 41.
6,417,418 are formed.

42 is a separation block having a sealing O-ring 421 attached to its outer periphery.

A hole 422 is formed in the center of this block 42.

The block 42 has a threaded part formed on a part of its outer periphery, and is fixed to the body 41 (threaded part 418).

This block 42 allows the inside of the body 41 (hole 41
1) is separated into an exhaust side including the ventilation holes 412 and an intake side not including the ventilation holes 412.

A strainer 144 fixed to the body 41 (threaded portion 417) is an elastic band 43 that suppresses the annular groove 413 (the opening of the ventilation hole 412).

Referring again to FIG. 1, reference numeral 5 denotes a tube connected to the joint 4, which consists of a metal tube 51 and a soft tube 52.

The open end of this tube 5 reaches near the electrode 11 inside the electrode section 1.

The connection between the joint 4 and the tube 5 is as shown in FIG.
Connect the metal tube 51 to the separation block 42 (hole 422
and the metal tube).

A soft tube 52 is connected to the metal tube 51.

Note that compressed air is supplied to the joint 4 from a compressed air source (not shown).

Next, the operation of the device of the present invention will be explained based on FIGS. 1 and 2.

First, air supplied to the air purge joint 4 from the compressed air source enters the tube 5 through the hole 422 from the strainer 43, and is discharged into the electrode section 1 from the other end of the tube 5.

Due to the inflow of this dry air, the internal pressure of the closed container made up of the electrode section 1, the main body 2, and the pipe 3 increases.

When the internal pressure rise exceeds a certain value, the elastic band 4
4 extends, and a gap is created between it and the body 41.

Therefore, air near the main body 2 is released to the outside through the hole 411 and the ventilation hole 412.

Therefore, in this state, air flows from the vicinity of the electrode 11 (inside the electrode part 1) to the vibrator 3 to the main body 2, and the inside of the electrode part 1 and the like is dried, and insulation deterioration does not occur.

When air purging is not performed, the elastic band 44 is in close contact with the opening of the ventilation hole 412.

Therefore, outside air does not enter into the electrode portion 1, the main body 2, etc.

Note that by changing the inner diameter of the hole 422, the amount of air flowing in can be changed.

As explained above, according to the present invention, it is possible to realize an immersion type pH transmitter that does not cause insulation deterioration.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram showing an embodiment of the immersion type pH transmitter according to the present invention, and FIG. 2 is a sectional view showing the configuration of the air purge joint of FIG. 1. 1... Electrode part, 2... Main body, 3...
...Pipe, 4...Air purge fitting, 5.
...Tube, 41 ... Cylindrical body,
42... Separation block, 43... Strainer - 44... Elastic band.

Claims (2)

[Scope of utility model registration request] (1) Immersion type pH sensor that connects the electrode part placed in the liquid to be measured and the main body placed outside the liquid to be measured with a pipe.
An immersion type pH transmitter in which an air purge joint is attached to the main body of the transmitter, and the purge air supplied through the joint is sent into the electrode part through a tube. (2) A cylindrical body having a ventilation hole penetrating the thick wall portion and a threaded portion formed between the ventilation hole and one end surface; An air purge joint is constituted by a separation block that separates the exhaust side including the ventilation hole from the intake side not including the ventilation hole, and an elastic band that suppresses the opening part of the ventilation hole on the outer periphery of the cylindrical body. 2. The immersion type pH transmitter according to claim 1, wherein the purge air on the intake side of the cylindrical body is sent into the electrode part through a tube.