GB2165053A - A power supply circuit for a device for monitoring carbon monoxide content - Google Patents
A power supply circuit for a device for monitoring carbon monoxide content Download PDFInfo
- Publication number
- GB2165053A GB2165053A GB08523623A GB8523623A GB2165053A GB 2165053 A GB2165053 A GB 2165053A GB 08523623 A GB08523623 A GB 08523623A GB 8523623 A GB8523623 A GB 8523623A GB 2165053 A GB2165053 A GB 2165053A
- Authority
- GB
- United Kingdom
- Prior art keywords
- sensor
- voltage
- circuit layout
- power supply
- amplifier
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
- G01N27/403—Cells and electrode assemblies
- G01N27/404—Cells with anode, cathode and cell electrolyte on the same side of a permeable membrane which separates them from the sample fluid, e.g. Clark-type oxygen sensors
- G01N27/4045—Cells with anode, cathode and cell electrolyte on the same side of a permeable membrane which separates them from the sample fluid, e.g. Clark-type oxygen sensors for gases other than oxygen
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Physics & Mathematics (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Molecular Biology (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
- Testing Or Calibration Of Command Recording Devices (AREA)
Abstract
A circuit layout for the supply of power to an electrochemical device for the continual monitoring of the carbon monoxide content of underground air currents which device creates an output current proportional to the CO content of the air current. The sensor is driven by a potentiostat circuit with a test amplifier for the output current and an adjustable amplifier feeding a recorder output. These devices are powered from an intrinsically safe source (shown as an accumulator with limiting resistors R1, R2 and fuse S1) via a constant voltage regulator with an operations amplifier coupled to its output and an indicator as to whether sufficient operational voltage is being supplied. The power supply maintains the sensor in operating condition removing the need for a 14 hour activation phase. <IMAGE>
Description
SPECIFICATION
A power supply circuit for a device for monitoring carbon monoxide content
Background of the invention
The invention concerns a circuit layout for the supply of power to a device for the continual monitoring of the carbon monoxide content in underground air currents assisted by an electro-chemical sensor, which creates an output current proportional to the CO content of the air current, the circuit layout containing a potentiostat, a test amplifier to activate the sensor, and an adjustable amplifier to record the sensor current, together with a current supply.
A circuit layout of this type is known. This has the disadvantage that a perceptible activation phase of about 14 hours is necessary to activate the sensor. This is obviously detrimental as it is desired that the sensor be fully operational as soon as it is switched on.
Brief summary of the invention
The invention sets out therefore, to propose a circuit layout of the above type by which the sensor would be immediately operational.
To achieve this object the invention is characterized as, that the intrinsically safe current supply conducts its output current to a constant voltage regulator with an operations amplifier coupled at the outlet side together with an indicator for the operational voltage which indicates whether sufficient operation current or too low a current is available.
Therefore the time-and manpower-costly activation phase lasting several hours is dispensed with.
In contrast, the sensor is immediately operational after switch-on of the circuit layout according to the invention because the sensor is continually supplied with a constant voltage. The sensor is therefore immediately operational without the need for the presently necessary activation phase. The sensor current is amplified and the output voltage of the sensor can then be recorded by means of recording equipment. The equipment is designed for battery (accumulator) and mains power and can be used either above or below ground for permanent activation of electro-chemical CO sensors. The potential for the recording of the values enables an efficient checking of the function when the sensor is located above ground.
In other words, the circuit layout according to the invention for the monitoring of the CO content underground, is so equipped that the activation can be achieved either underground or above ground.
The invention is further explained in the following, using a layout example from which further important features of the invention arise. The accompanying illustration shows a block diagram of a circuit layout according to the invention.
This block diagram shows the electric and electronic components of a circuit diagram according to the invention together with the respective accompanying inscriptions, from which an expert can construct the circuit layout. Therefore going into details has been dispensed with.
Detailed description
The illustration also shows that the circuit diagram according to the invention is broken down into several blocks, namely Blocks 1, 2, 3, 4 and 5.
By means of this Block break-down the novelty of the invention is expiained in the following.
Block 1 is essentially conventional The partial circuit of Block 1 contains a potentiostat and a test amplifier to activate the sensor as explained in the introduction. Block 1 also contains an adjustable amplifier to enable recording of the sensor voltage by means of recording equipment as required.
To supply Block 1 of the circuit with voltage, the further Blocks 2 to 5 are connected in series according to the invention. Block 2 contains a constant voltage regulator with an operations amplifier coupled at the outlet side for voltage balancing to + 5 volts.
Both further ,Blocks 3 and 4 serve the operational voltage indicator. Block 3 signals that the operational voltage is sufficient while a recording comparator provides for an optical low voltage indicator.
The complete circuit is powered from an electric circuit Block 5, which, by means of special measures, is intrinsically safe. The intrinsic safety is achieved by the voltage limitation of the resistances R1, R2, and the fuse S1. These components are, together with accumulator cells, cast into the housing cover carrying the circuit layout.
The analyzer to be actuated is fitted with a known diffusion head containing an electro-chemical sensor namely the stable and intrinsically safe
CO-analyser "Comytron" supplied by the Firm of Drawer.
The complete fixed CO measuring equipment consists of the measuring device "Comytron", the accompanying diffusion measuring head and a power pack (220V AC/12-15V DC) with intrinsically safe output. After assembly and complete connection of the measuring equipment the supply voltage is switched on. After about 14 hours runningin time the equipment can be calibrated. This running-in time is only necessary for the sensor and not the electronics of the CO measuring equipment.
To achieve usable results after bringing new measuring equipment into service, the sensor must be connected to a voltage-supplied measuring device for a minimum of 14 hours. This means that during transportation to the place of operation the "Comytron" must be supplied from an accumulator of battery, As the current consumption of this device is approximately 380mA a relatively large accumulator is necessary which must be specifically authorized for it. Such an accumulator weighs about 7kg and the CO measuring equipment 19kg.
Both parts are connected to each other by wiring and are therefore not able to be brought underground.
The CO sensor activator was developed to enable the transport of a single analyzer underground as only this requires the long running-in time. This
CO sensor activator contains only the electronic parts necessary to ensure a perfect activation of the analyzer. It is therefore possible to construct a small, handy device with low current consumption in an intrinsically safe and weatherproof form.
The circuit parts necessary for the activation are the potentiostat with IC4 which maintains a constant voltage at the sensor between its load and reference electrode, and the test amplifier with IC5 with which the voltage drop called up by the sensor current proportional to the CO content of the measured air is amplified at a fixed resistor.
The adjustable measured value amplifier with IC6, coupled at the output side serves merely to monitor the analyzer above ground as required with recording equipment over long periods. For such long-term testing it is necessary to supply the
CO sensor according to the invention with mains power for which the capacity of the accumulator is insufficient. This is an extra variant of equipment devised only for above ground use e.g. Electric or
Repair workshops, to check an analyzer before use.
By means of the described measures a perfect activation of the sensor coupled to the output side of the circuit layout in an intrinsically safe form is possible underground and in storm-prone regions.
The described circuit layout can be used for all types of electro-chemical sensors. It is designed for use with mains or battery powder.
Claims (3)
1. A circuit layout to activate electro-chemical
CO sensors which creates an output current proportional to the CO content of an underground air current, characterized by:
an intrinsically safe power supply whose output voltage is conducted to a constant voltage regulator with operations amplifier coupled to the output side, together with an indicator for the operational voltage which indicates either a sufficient operational voltage or an underground voltage, and in that the circuit layout for the activation of the sensor contains a potentiostat, a test amplifier and an adjustable amplifier to record the sensor voltage together with a power supply.
2. A circuit layout for activating electro-chemical CO sensors, substantialiy as hereinbefore described with reference to the accompanying drawing.
3. CO monitoring apparatus including a circuit layout as claimed in claim 1 or 2.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19843435079 DE3435079A1 (en) | 1984-09-25 | 1984-09-25 | CIRCUIT ARRANGEMENT FOR THE POWER SUPPLY OF A DEVICE FOR MONITORING THE CARBON MONOXIDE CONTENT |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB8523623D0 GB8523623D0 (en) | 1985-10-30 |
| GB2165053A true GB2165053A (en) | 1986-04-03 |
Family
ID=6246252
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08523623A Withdrawn GB2165053A (en) | 1984-09-25 | 1985-09-25 | A power supply circuit for a device for monitoring carbon monoxide content |
Country Status (3)
| Country | Link |
|---|---|
| DE (1) | DE3435079A1 (en) |
| FR (1) | FR2573260A1 (en) |
| GB (1) | GB2165053A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6404609B1 (en) * | 2000-03-31 | 2002-06-11 | Micro Motion, Inc. | Circuit that reduces the numbers of components needed to transmit data from intrinsically safe to non-intrinsically safe circuits using opto-couplers |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102004006060A1 (en) * | 2004-02-03 | 2005-08-18 | Visolux Zweigniederlassung Der Pepperl + Fuchs Gmbh | Multiple sensor unit under voltage indicating unit uses processor with switched outputs or controller to activate changing colour pattern of display elements |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4219806A (en) * | 1978-09-15 | 1980-08-26 | American District Telegraph Company | Dual alarm gas detector |
| GB2105849B (en) * | 1981-09-11 | 1985-05-15 | Coal Ind | Electrical gas analyser for sensing at least two gases |
-
1984
- 1984-09-25 DE DE19843435079 patent/DE3435079A1/en not_active Withdrawn
-
1985
- 1985-09-25 FR FR8514401A patent/FR2573260A1/en not_active Withdrawn
- 1985-09-25 GB GB08523623A patent/GB2165053A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6404609B1 (en) * | 2000-03-31 | 2002-06-11 | Micro Motion, Inc. | Circuit that reduces the numbers of components needed to transmit data from intrinsically safe to non-intrinsically safe circuits using opto-couplers |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2573260A1 (en) | 1986-05-16 |
| GB8523623D0 (en) | 1985-10-30 |
| DE3435079A1 (en) | 1986-04-03 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |