Hobbit-t with digital display. Hobbit-t portable gas analyzers Type approval mark

The principle of operation of the gas analyzer is based on measuring the currents of electrochemical, thermocatalytic (when measuring the amount of combustible gases) or optical (when measuring the content of carbon dioxide or methane) sensitive elements (sensors). The sensor current is proportional to the partial pressure of the gas it measures in air. The type of sensor used is determined by the gas to be monitored. The signals of sensitive elements (sensors) located in the sensor unit are fed to the inputs of amplifiers that convert, amplify and match with an analog-to-digital converter.

After turning on the power, the gas analyzer starts to work in the mode of continuous measurement of the controlled gas. The measurement results of the first channel are displayed immediately after the power is turned on. When the set threshold level of gas contamination for toxic gas is exceeded or when the oxygen content exceeds the set threshold levels, regardless of the currently viewed channel, an audible and LED alarm is activated. The gas analyzer has a battery discharge control circuit, which signals a decrease in the supply voltage below an acceptable level. When the battery voltage drops below the acceptable level, the display shows the message “Ac. discharged."

Specific configuration gas analyzer HOBBIT-T determined by the consumer and displayed in the passport (Appendix A): the number of measurement channels (one channel - one analyzed gas), the list of analyzed gases, measurement ranges, set thresholds and other parameters.

Portable multicomponent gas analyzers HOBBIT-T (transl.) with a remote sensor are divided into two main modifications:
- general industrial version with a remote sensor unit on a cable of six or more meters;
- with a remote block of sensors "Hobbit-TV" in explosion-proof design on a cable of six or more meters.

Distinctive features of the Hobbit-T gas analyzer:

• small weight and dimensions;
• built-in light and sound alarm;
• performance at negative temperatures(up to -40°С);
• battery discharge control is provided;
• electronic zero setting.

Technical characteristics of the portable gas analyzer (alarm device) Hobbit-T:

Metrological characteristics of gas analyzer Hobbit-T

Included in the Hobbit-T delivery set with a remote sensor on a 6 m cable:

• Gas analyzer
• Charger
• Carry bag

The gas analyzer HOBBIT-T is designed to measure the content of toxic gases, explosive gases, oxygen, carbon dioxide. Collateral safe conditions labor and use in emergency protection systems (Permission of the Gosgortekhnadzor of the Russian Federation No. РРС 04-10698 for production and use dated February 17, 2003)

The gas analyzer HOBBIT-T withstands an overload three times the upper threshold for 10 minutes, with the restoration of readings after removing the overload, after 30 minutes.

The display unit of the gas analyzer provides a direct reading of the measurement results in digital form with an indication of the units of measurement, chemical formula controlled gas and channel number. Provides an output to the display of error messages and a dialogue mode at calibration and handling of critical situations. In the display unit, each measurement channel has a 0-5 mA current output (4-20 mA on customer's request) with conversion functions. Communication with a computer is provided using a serial RS232 or RS458 interface. Provides separate for each measurement channel LED signaling of exceeding the specified gas contamination thresholds and measurement channel failure, duplicated by a built-in sound signal. Provides control signals to the switching unit.

The switching unit, in turn, is designed to control external actuators and provides switching current of not more than 1 A, at a voltage of 220 V 50 Hz. There are three terminals on the terminal block of the switching unit, to which "dry" relay contacts are brought out.

The supply voltage of the gas analyzer is 220 V 50 Hz. Power consumption is not more than 100 watts.

DEVICE AND OPERATION

The principle of operation of the gas analyzer is based on measuring the currents of electrochemical, thermal catalytic or optical sensitive elements. The sensor current is proportional to the partial pressure of the gas it measures in air.

The gas analyzer contains from 1 to 16 sensor units, an indication unit and a switching unit(s). Sensor blocks in the "universal" configuration variant allow parallel connection per line (per cable). In the “minimum” configuration option, each sensor unit is connected to the display unit with a separate cable.

The sensor unit is designed to convert the partial pressure of the measured gas into an electrical signal transmitted to the indication unit. The sensor blocks contain sensors with circuits for amplifying and matching the electrical signal, and a controller with peripheral microcircuits that provides analog-to-digital signal conversion and communication with the display unit in the RS485 standard. Operation in the RS485 standard allows parallel connection of up to 16 sensor units per communication line.

The switching unit is designed to control external actuators. For example, starters of supply and exhaust ventilation, switched on when the gas content thresholds established by the standards are reached. The gas analyzer is equipped with two types of switching units BR 8 and BR 16 with 8 and 16 switching contact groups, respectively.

The display unit provides the formation of the supply voltage of the sensor blocks, the reception and processing of signals from the sensor blocks, the display of measurement results on the display, the generation of personnel warning signals about reaching the specified levels of gas contamination (LED and sound alarms), current output signals, switching block control signals, communication with a computer , selection of the display mode and control of the built-in functions of the gas analyzer using the buttons on the front panel of the display unit, providing an interactive mode when calibrating the gas analyzer.

Each measurement channel of the sensor block has its own individual number, which is printed on the nameplate attached to the sensor block. The indication of the measurement results for each channel in the indication block strictly corresponds to this number, regardless of which connector with the inscription “to sensors” it is connected to.

Measurement results, requests and messages of the gas analyzer are displayed on the LCD screen. When the number of channels is two or more, the concentrations are displayed cyclically in turn. measured by channels starting from the first. Mode provided manual selection channel being viewed. In this mode, the display constantly shows readings for one. channel selected by the operator.

For each measurement channel there are LEDs for each set threshold and an alarm LED. The ignition of any LED is accompanied by a sound signal.

My personal opinion: the gas analyzer HOBBIT-T has some drawbacks, firstly, the price, secondly, there is no possibility to simultaneously monitor at least 2 3 channels, there is no way to turn off the built-in sound alarm, they are not divided by colors and it is inconvenient to observe the threshold LEDs, inconvenient to install , the weight of the sensor blocks is large and appearance wants improvements. But there is a plus, in some cases outweighing the disadvantages, this is the ability to take any (dry) contacts for each channel separately, i.e., if necessary, you can connect an external actuator to any threshold from any channel.

Gas analyzers "HOBBIT-T" are designed to measure the concentration of toxic gases: carbon monoxide, hydrogen sulfide, sulfur dioxide, chlorine, hydrogen fluoride, ammonia; combustible gases: hydrogen and carbon monoxide; sums of combustible gases with calibration for one of the gases: methane, propane, hexane, hydrogen or carbon monoxide, as well as carbon dioxide, oxygen and signaling that the concentration exceeds the established threshold values ​​for their content in the air working area and in gas environments at various technological processes, including in emergency protection systems.

Description

The principle of operation is based on measuring the current that occurs when gases interact with the sensitive element (sensor) of gas analyzers and is proportional to the content of the determined component in the air.

Gas analyzers are divided into stationary and portable, conventional and explosion-proof. Stationary gas analyzers can have up to 16 measurement channels, portable gas analyzers - up to 5 channels.

The gas analyzers consist of: sensor units, an indication unit and a switching unit (only in a stationary version for controlling external actuators), electrically interconnected. To measure the concentration of toxic gases and oxygen in the sensor blocks, electrochemical sensors are used; for measuring the content of combustible gases and the amount of combustible gases - thermal catalytic sensors, for measuring the content of carbon dioxide - optical sensors. Explosion-proof gas analyzers are equipped with HOBBIT-TV sensors with a spark protection unit.

The indication block of stationary gas analyzers can have a digital indicator, a code output to a computer, a current output of 0 - 5 mA (4 - 20 mA) for each measurement channel, visual and audible alarms for the operation of threshold devices and the issuance of control signals to external actuators, overload alarm sensors, visual and audible signaling of communication failure of the stationary display unit with the sensor units.

The indication block of portable gas analyzers has a digital indicator, visual and audible signaling of threshold devices operation.

General form The sensor blocks are shown in Figures 1 and 2. The general view of the gas analyzer indication blocks is shown in Figures 3, 4 and 5. The general view of the switching block is shown in Figure 6. The gas analyzer sensor blocks are sealed with a non-repairable sticker covering one of the screws on the sensor block case. The gas analyzer indication units are sealed with a non-repairable sticker covering the joint between the front panel and the side panel.

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CHANNEL 1 SO

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Software

Gas analyzers have a built-in software(ON). Identification data of the software are given in Table. one.

Table 1

Software protection against intentional and unintentional changes corresponds to the level "C" according to MI 3286-2010.

Specifications

The measurement ranges, the limits of the permissible basic measurement error and the time for setting the readings are given in Table. 2.

table 2

Limits of permissible additional error, fraction of the limit of the main error, no more than:

From changes in ambient temperature for every 10 °C 0.5

From the mutual influence of non-measurable components 1.5 Variation of indications, fraction of the limit of the main error, no more than 0.5 Warm-up time, min, no more than 15 Change in the output signal for 24 hours of operation of portable gas analyzers, fraction of the limit of the main error, no more than 0, 5 Change in the output signal over 14 days of stationary gas analyzers, fraction of the limit of the main error, no more than 0.5 Weight, kg, no more

Display unit (stationary) 3.5

Display unit (portable) 0.25

Sensor block 0.7

Switching unit 3.5 dimensions, mm, not more than:

Display unit (stationary) 260x240x120

Display unit (portable) 150x80x30

Sensor block 100x80x250

Portable gas analyzers (permanent) 3.6 to 8.4

Stationary gas analyzers (variable frequency 50±1 Hz) 220±22

(or constant) 15 to 24 Maximum power consumption:

Portable gas analyzers, W, no more than 2.4

Stationary gas analyzers, V A, no more than 160

total sheets 6

Power consumption in terms of one channel:

Portable gas analyzers, W, max

Stationary gas analyzers, V A, not more than Mean time between failures, h, not less than Operating conditions:

Ambient temperature

For HF measurement channels, °С

minus 10 - 50 minus 40 - 50 minus 20 - 50 to 95

For measurement channels of other gases, °С

For display unit with LCD, °С

Relative humidity at 30 °С, %

Atmospheric pressure, kPa

Type approval mark

printed on title page Operating manuals and on the front panel of the display unit.

Completeness

Verification

carried out in accordance with the verification procedure 436-076-2012 MP "Gas analyzer" HOBBIT-T ". Verification Methodology”, approved by the GCI SI FBU “Test-S.-Petersburg” on 06.03.2012

List of standards used for verification:

Calibration gas mixtures (GSO-PGS) in pressure cylinders, State Register No.: 3722-87, 3726-87, 3728-87, 3771-87, 3772-87, 3815-87, 3827-87, 3831-87, 3843 -87, 3844-87, 3847-87, 3904-87, 3945-87, 3950-87, 3951-87, 3968-87, 3969-87, 3970-87, 4036-87, 4272-88, 5321-90 , 5322-90, 5333-90, 5903-91, 8742-2006, 9160-2008, 9170-2008; 3

Rotameter RM-A-0.063G UZ, VPI 0.063 m3/h, PG ±4%;

Stopwatch "Agat", 30 min, PG ±1 s;

Gas mixture generator 666 GR-03M, 0.3 - 70 mg/m3 H2S, PG ±2%; 1.1 - 313 mg/m3 SO2, PG ±2%; 0.8 - 172 mg/m3 NO2, GHG ±2%;

Chlorine generator GH-120-3, 0.5 - 30.0, 0.3 - 70 mg/m3, PG ±10%;

PGS generator Infan EHGR-HF, 0.4 - 5.0 mg/m3, PG ±7%.

Information about measurement methods

Measurement methods are given in section 2.4 of the Operation Manual "Gas analyzer" HOBBIT-T "LSHYUG.413411.010 RE.

Regulatory and technical documents that establish requirements for gas analyzers "HOBBIT-T"

1. GOST 8.578-2008 “GSI. State verification scheme for measuring instruments for the content of components in gaseous media.

2. GOST 13320-81 “Industrial automatic gas analyzers. General technical conditions".

3. TU 4215-010-46919435-99 (LSHYUG.413411.010) "Gas analyzer" HOBBIT-T ". Specifications".

4. Verification procedure 436-076-2012 MP "Gas analyzers" HOBBIT-T. Verification Methodology”, approved by the GCI SI FBU “Test-S.-Petersburg” on 03/06/2012.

Performance of work to ensure safe conditions and labor protection (item 43 of Appendix 2 to the order of the Ministry of Health and Social Development of Russia No. 1034 of 09.09.11)

The stationary gas analyzer HOBBIT-T consists of sensor units (their number depends on the number of control points) and an indication unit. To control external actuating devices (ID), a switching unit (s) is included in the delivery set.

Stationary gas analyzer HOBBIT-T is used for:

measurement of oxygen content O2; measurements of the content of toxic gases (carbon monoxide CO, hydrogen sulfide H2S, sulfur dioxide SO2, chlorine Cl2, fluorine F2, hydrogen fluoride HF, ammonia NH3, ozone O3); measuring the amount of combustible gases reduced to methane CH4, propane C3H8, hexane C6H14, hydrogen H2 or carbon monoxide CO; measurement of carbon dioxide content CO2; alarms on the output of the content of determined gases in the controlled working area beyond the permissible limits; ensuring safe working conditions and use in emergency protection systems.

Note: the number of control points and the required set of gases measured by HOBBIT-T are set by the consumer when ordering a gas analyzer and determine the number of measurement channels. One channel of the gas analyzer provides measurement of one of the gases listed in the table Ranges of indications and measurements (table 2).

The maximum number of measurement channels for the gas analyzer HOBBIT-T is 16.
The operation of the stationary gas analyzer HOBBIT-T is based on measuring the currents of thermocatalytic (when measuring the amount of combustible gases), electrochemical or optical (when measuring the content of carbon dioxide) sensitive elements (sensors). The sensor current is proportional to the partial pressure of the gas it measures in air. The type of sensor used is determined by the gas to be monitored.

Climatic characteristics of the stationary gas analyzer HOBBIT-T

Ranges of indications and measurements of the gas analyzer HOBBIT-T

Notes:
1) - permissible concentration overload is given as a multiple of the upper limit of the measurement range (VP);
2) - in the air of the working area, the volume fraction of oxygen does not exceed the upper limit of measurements;
3) - sensors for carbon dioxide CO2 and combustible gases (CH4, C3H8, C6H14, H2) withstand concentration overload at the content of the determined component up to 100%;
4) - sensors in sensor blocks with calibration for H2 hydrogen, upon request, can be turned on in a mode that provides insensitivity to methane CH4, propane C3H8, hexane C6H14 or carbon monoxide CO;
5) - in sensor blocks with channels for measuring H2 and / or CO and / or any of the hydrocarbons (CH4, C3H8, C6H14), on request, the cross-effect of the measured gases can be taken into account.

Technical characteristics of the stationary gas analyzer HOBBIT-T

The stationary gas analyzer withstands concentration overload for 10 minutes in accordance with column 2 of Table 2, with readings restored after the overload is removed after 30 minutes.
The display unit of the gas analyzer HOBBIT-T provides:
- direct reading of measurement results in digital form with indication of units of measurement (see table 2), chemical formula of the controlled gas and channel number. The nominal price of the unit of the smallest category is given in column 5 of table 2;
- dialog mode and display of error messages during processing and calibration of critical situations;
- separate for each measurement channel LED signaling of exceeding the specified gas contamination thresholds and measurement channel malfunction, duplicated by a built-in sound signal;
- issuance of control signals to the switching unit.
The switching unit of the gas analyzer HOBBIT-T is designed to control external actuators and provides switching current of not more than 1 A, at a voltage of 220 V, 50 Hz.
Stationary gas analyzers HOBBIT-T are produced in two configuration versions:
- "Universal" - the device allows the connection of sensor blocks as a "garland" and a "star". It is completed with external blocks of load resistances, two connectors are installed on the sensor blocks (the second one is used for broadcasting the communication line);
- "Minimum" - the device allows connection of sensor blocks only with a "star". Load resistors are built into the sensor blocks. There is one connector on the sensor blocks.