Portable gas analyzers Hobbit-t. Hobbit-t gas analyzers Stationary hobbit-t gas analyzer
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Gas analyzers "HOBBIT-T" are designed to measure the concentration of toxic gases: carbon monoxide, hydrogen sulfide, sulfur dioxide, chlorine, hydrogen fluoride, ammonia; flammable gases: hydrogen and carbon monoxide; sums of flammable gases with graduation according to one of the gases: methane, propane, hexane, hydrogen or carbon monoxide, as well as carbon dioxide, oxygen and alarm when the concentration exceeds the established threshold values of their content in the air working area and in gas environments at different 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 component being determined 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.
Gas analyzers consist of: sensor units, an indication unit and a switching unit (only in a stationary version for controlling external actuators), electrically connected to each other. To measure the concentration of toxic gases and oxygen in sensor blocks, electrochemical sensors are used; for measuring the content of flammable gases and the sum of combustible gases - thermocatalytic 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 display unit of stationary gas analyzers can have a digital indicator, a coded output to a computer, a current output of 0 - 5 mA (4 - 20 mA) for each measurement channel, visual and audio signaling of the activation of threshold devices and the issuance of control signals to external actuators, overload alarm sensors, visual and sound alarm communication disruptions stationary unit indications with sensor blocks.
The display unit of portable gas analyzers has a digital indicator, visual and audio alarms for triggering threshold devices.
General form The sensor blocks are shown in Figures 1 and 2. The general view of the gas analyzer display blocks is shown in Figures 3, 4 and 5. The general view of the switching unit is shown in Figure 6. The gas analyzer sensor blocks are sealed with a non-renewable sticker covering one of the screws on the sensor block housing. The display units of the gas analyzers are sealed with a non-renewable sticker that covers the joint between the front panel and the side panel.
|_“SENSORS
pogo* now g I tav*»
CHANNEL 1 CO
CO 20 -120 ppm’ CH. 0.22 - 2.20 ov. %
Software
Gas analyzers have a built-in software(BY). Software identification data is given in table. 1.
Table 1
|
Name software provision |
Software identification name |
Software version number (identification number) |
Digital identifier software provision |
Algorithm calculations digital identifier software provision |
|
Plate 5 channel 00 | ||||
|
Centr xobbit new 12 | ||||
|
Centr xobbit new 12 | ||||
|
Centr xobbit new 12 |
Software protection from intentional and unintentional changes corresponds to level “C” according to MI 3286-2010.
Specifications
The measurement ranges, the limits of permissible basic measurement error and the time to establish the readings are given in table. 2.
table 2
|
Define component |
Range measurements |
Time to establish T09 readings, s, no more |
Limits of permissible basic error |
|
|
relative,% |
absolute, % |
|||
|
20 - 120 mg/m3 | ||||
|
10 - 100 mg/m3 | ||||
|
1.0 - 25 mg/m3 | ||||
|
0.5 - 3.0 mg/m3 | ||||
|
20 - 600 mg/m3 | ||||
|
0.1 - 5.0 vol.% | ||||
|
±(0.05 ^zm + 0.2) |
||||
|
0.20 - 2.00 vol.% | ||||
|
0.55 - 5.45 vol.% | ||||
|
Sum of flammable gases, graduated according to: |
||||
|
0.22 - 2.20 vol.% | ||||
|
0.09 - 0.85 vol.% | ||||
|
1.8 - 17.5 mg/l | ||||
|
0.20 - 2.00 vol.% | ||||
|
0.55 - 5.45 vol.% | ||||
Limits of permissible additional error, fraction of the main error limit, no more:
From temperature changes environment for every 10 °C 0.5
From the mutual influence of unmeasured components 1.5 Variation of readings, fraction of the basic error limit, no more than 0.5 Warm-up time, min, no more than 15 Change in the output signal over 24 hours of operation portable gas analyzers, fraction of the main error limit, no more than 0.5 Change in the output signal over 14 days of stationary gas analyzers, fraction of the basic error limit, 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, no more:
Display unit (stationary) 260x240x120
Display unit (portable) 150x80x30
Sensor block 100x80x250
Portable gas analyzers (permanent) from 3.6 to 8.4
Stationary gas analyzers (variable frequency 50±1 Hz) 220±22
(or constant) from 15 to 24 Maximum power consumption:
Portable gas analyzers, W, no more than 2.4
Stationary gas analyzers, VA, no more than 160
total sheets 6
Power consumption per channel:
Portable gas analyzers, W, no more
Stationary gas analyzers, VA, no more Mean time between failures, hours, no less Operating conditions:
Ambient temperature
For HF measurement channels, °С
minus 10 - 50 minus 40 - 50 minus 20 - 50 to 95
For channels measuring other gases, °C
For display unit with LCD, °C
Relative humidity at 30 °C, %
Atmospheric pressure, kPa
Type approval mark
printed on title page Operating manuals and on the front panel of the display unit.
Completeness
|
1. Gas analyzer consisting of: | |
|
Sensor block* | |
|
Display block | |
|
Switching block** | |
|
2. Connecting cable*** | |
|
3. Charger**** | |
|
4. CD with PC communication program | |
|
5. Adapter ***** | |
|
6.Operation manual | |
|
7. Verification method | |
|
Notes: 1)* - The number of sensor units and extension cables for them are supplied in accordance with the order; 2)** - Only in stationary version; 3) *** - Cable length - according to project documentation; 4) **** - Only in portable version; 5)***** - Available upon request. |
|
Verification
carried out in accordance with the verification method 436-076-2012 MP “Gas analyzer “HOBBIT-T”. Verification methodology”, approved by the State Central Inspection Center of the Federal Budgetary Institution “Test-St. Petersburg” on 03/06/2012.
List of standards used during verification:
Test gas mixtures (GSO-PGS) in cylinders under pressure, 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 US, URL 0.063 m3/hour, PG ±4%;
Stopwatch “Agat”, 30 min, PG ±1 s;
Generator gas mixtures 666 GR-03M, 0.3 - 70 mg/m3 H2S, PG ±2%; 1.1 - 313 mg/m3 SO2, GHG ±2%; 0.8 - 172 mg/m3 NO2, GHG ±2%;
Chlorine generator GC-120-3, 0.5 - 30.0, 0.3 - 70 mg/m3, PG ±10%;
Generator PGS 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, establishing 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 “Automatic industrial gas analyzers. General technical conditions".
3. TU 4215-010-46919435-99 (LSHYUG.413411.010) “Gas analyzer “HOBBIT-T”. Technical conditions".
4. Verification method 436-076-2012 MP “Gas analyzers “HOBBIT-T.” Verification methodology”, approved by the State Central Inspection Center of the Federal Budgetary Institution “Test-St. Petersburg” on 03/06/2012.
Carrying out support work 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 Hobbit-T gas analyzer is designed to monitor the normal oxygen content, as well as dangerous gas contamination of the air in the working area with flammable gases, hydrogen sulfide, carbon monoxide, ammonia and other dangerous gases. SPS must be equipped with gas analyzers that indicate when the maximum permissible concentration of harmful gases in the air of the working area is exceeded. To control methane, hydrogen sulfide, ammonia, carbon dioxide (carbon dioxide) and other gases that may be released during biodegradation Wastewater, gas analyzers of the “Hobbit-T” type with a set of corresponding sensors are used
Peculiarities:
- The total number of sensors is up to 16 (in any combinations)
- Built-in light and sound alarm
- Complete with relay blocks for switching actuators
- Computer connection
- Possibility of connecting sensor units with a “star” and “garland” display unit
- The sensors of the device are designed to be resistant to moisture and aggressive environments
Specifications:
| Options | Meaning |
| Number of sensors | Up to 16 |
| Reading range: - O2 - CH 4 - C 3 H 8 - C 6 H 14 - H 2 - CO is flammable - CO -H2S - SO 2 - Cl 2 - NH 3 - CO 2 - O 3 | 0...36 rev. % 0.00...2.55 vol.% 0.00...1.00 vol.% 0.00...25.50 mg/dm 3 0.00...2.55 vol.% 0.00...6.50 vol.% 0.00...150.00 mg/m 3 0.00...36.00 mg/m 3 0.00...120.00 mg/m 3 |
| Concentration measurement range: - O2 - CH 4 - C 3 H 8 - C 6 H 14 - H 2 - CO is flammable - CO -H2S - SO 2 - Cl 2 - NH 3 - CO 2 - O 3 | 1...30 rev. % 0.22...2.20 vol.% 0.09...0.85 vol.% 1.80...17.50 mg/dm 3 0.20...2.00 vol.% 0.55...5.45 vol.% 20.00...120.00 mg/m 3 5.00...30.00 mg/m 3 10.00...100.00 mg/m 3 1.00...25.00 mg/m 3 20.00...600.00 mg/m 3 0.10...5.00 vol.% 100.00...500.00 μg/m 3 |
| Relative measurement error | 25,00% |
| Reading indication | LCD display, current output |
| Alarm thresholds by channel | O 2: 18% vol. down or 23% vol. for promotion Combustible gases: 10% LEL 1 MPC of toxic gas |
| Cable length between sensor and display unit | Up to 1200 m |
| Supply voltage | ~220 V, 50 Hz |
| Power consumption | 60 W |
| Time to establish readings at level 0.9 | No more than 20...90 s |
| Operating temperature range | −40°С...50°С |
| Weight: - display unit - switching unit - sensor block |
3500 g 700 g 300 g |
| Dimensions: - display unit - switching unit - sensor block |
260×240×120 mm 156×86×58 mm ∅ 50×165 mm |
The stationary gas analyzer HOBBIT-T consists of sensor blocks (their number depends on the number of control points) and an indication block. To control external actuators (ED), a switching unit(s) is included in the delivery package.
The stationary gas analyzer HOBBIT-T is used for:
- oxygen O2 measurements; measurements 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 content of the sum of combustible gases, reduced to methane CH4, propane C3H8, hexane C6H14, hydrogen H2 or carbon monoxide CO; carbon dioxide CO2 measurements; alarm when the content of detectable gases in the controlled working area exceeds 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 specified by the consumer when ordering the 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 readings and measurements (Table 2).
Maximum number measurement channels for the gas analyzer HOBBIT-T - 16.
The operation of the stationary gas analyzer HOBBIT-T is based on measuring the currents of thermocatalytic (when measuring the content of the sum 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 the air. The type of sensor used is determined by the gas to be monitored.
Climatic characteristics of the stationary gas analyzer HOBBIT-T
| Characteristics | Values |
| Climatic performance | UHL2 according to GOST 15150-69 |
| Relative air humidity (upper value) at a temperature of 30 ° C | 95% |
| Operating temperature range: | |
| - for all channels except HF channels | From -40 to +50 °C |
| - for HF channels | From -10 to +40 °C |
| Atmosphere pressure | From 84 to 106.7 kPa |
| Tension magnetic field, no more | 40 A/m |
| Shell protection degree according to GOST 14254-96: | |
| - for display units | IP-50 |
| - for sensor blocks | IP-53 |
| Climate resistance | Groups C4 and P1 according to GOST 12997-84 |
| Resistant to sinusoidal vibration | Group N1 according to GOST 12997-84 |
Indication and measurement ranges of the HOBBIT-T gas analyzer
| Defined Component | Permissible concentration overload | Reading range | Coeff. current recalculation exit k1/k2 | Unit price of the smallest digit | measurement range | Permissible content of unmeasured components, no more |
| 1 | 2 | 3 | 4 | 5 | 6 | 7 |
| Carbon monoxide CO | 8 1) | 0 - 150 mg/m3 | 30 / 9,37 | 1mg/m3 | 20 - 120 mg/m3 | NO - 3 mg/m3 |
| NO2 - 3 mg/m3 | ||||||
| NH3 - 20 mg/m3 | ||||||
| SO2 - 100 mg/m3 | ||||||
| Hydrogen sulfide H2S | 10 1) | 0 - 36.0 mg/m3 | 7,2 / 2,25 | 0.1 mg/m3 | 5 - 30 mg/m3 | SO2 - 10 mg/m3 |
| CO - 50 mg/m3 | ||||||
| NO2 - 20 mg/m3 | ||||||
| NO - 100 mg/m3 | ||||||
| Sulfur dioxide SO2 | 10 1) | 0 - 120 mg/m3 | 24 / 7,5 | 1mg/m3 | 10 - 100 mg/m3 | H2S is not allowed |
| CO - 10 mg/m3 | ||||||
| NO2 - 20 mg/m3 | ||||||
| NO - 40 mg/m3 | ||||||
| Chlorine Cl2 | 40 1) | 0 - 30 mg/m3 | 6 / 1,875 | 0.1 mg/m3 | 1 - 25 mg/m3 | - |
| Fluorine F2 | 10 1) | 0 - 0.20 mg/m3 | 0,04 / 0,0125 | 0.01 mg/m3 | 0.03 - 0.15 mg/m3 | Cl2 - 0.5 mg/m3 |
| Hydrogen fluoride HF | 5 1) | 0 - 3.5 mg/m3 | 0,6 / 0,1875 | 0.1 mg/m3 | 0.5 - 3.0 mg/m3 | HCl - 4.5 mg/m3 |
| Ammonia NH3 | 3 1) | 0 - 700 mg/m3 | 140 / 43,75 | 1mg/m3 | 20 - 600 mg/m3 | - |
| Ozone O3 | - | 0 - 600 µg/m3 | 120 / 37,5 | 10µg/m3 | 100 - 500 µg/m3 | Cl2 - 0.5 mg/m3 |
| Carbon dioxide CO2 | - | 0 - 6 rev. % | 1,2 / 0,375 | 0.01 vol. % | 0.1 - 5 vol. % | - |
| Oxygen O2 | - 2) | 0 - 36 rev. % | 7,2 / 2,25 | 0.1 vol. % | 1 - 30 rev. % | - |
| Sum of flammable gases, graduated by: | 5 - 50% LEL or: | |||||
| - methane CH4 | - 3) | 0 - 2.55 rev. % | 0,51 / 0,159 | 0.01 vol. % | 0.22 - 2.2 vol. % | 5) |
| - propane C3H8 | - 3) | 0 - 1 rev. % | 0,2 / 0,0625 | 0.01 vol. % | 0.09 - 0.85 rev. % | 5) |
| - hexane C6H14 | - 3) | 0 - 25.5 mg/dm3 | 5,1 / 1,59 | 0.1 mg/dm3 | 1.8 - 17.5 mg/dm3 | 5) |
| - hydrogen H2 | - 3) | 0 - 2.55 rev. % | 0,51 / 0,059 | 0.01 vol. % | 0.2 - 2 vol. % | 4), 5) |
| - carbon monoxide CO | - 3) | 0 - 6.5 rev. % | 1,3 / 0,406 | 0.01 vol. % | 0.55 - 5.45 rev. % | 5) |
Notes:
1) - permissible concentration overload is given as a multiple of upper limit measurement range (VP);
2) - in the air of the working area, the volume fraction of oxygen does not exceed the upper measurement limit;
3) - sensors for carbon dioxide CO2 and flammable gases (CH4, C3H8, C6H14, H2) can withstand concentration overload when the content of the determined component is up to 100%;
4) - sensors in sensor blocks with calibration for hydrogen H2, 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), the cross-influence of the measured gases can be taken into account upon request.
Technical characteristics of the stationary gas analyzer HOBBIT-T
| Characteristics | Values |
| Basic error limit of the gas analyzer in the measurement ranges: | |
| - for all measurement channels (except oxygen) | ± 25% |
| - for oxygen measurement channels | ± (0.05 C + 0.2), % vol., where C is the measured oxygen concentration, % vol. |
| Limit of permissible variation of the gas analyzer output signal in fractions of the basic error limit | 0,5 |
| Limit of permissible change in the output signal in fractions of the basic error limit (within 14 days of continuous operation) | 0,5 |
| The additional error does not exceed: | |
| - from the basic error limit when the temperature changes for every 10 °C within the operating temperature range | 0,5 |
| - from the limit of the main error when the content of unmeasured components is within the limits according to column 7 of table 2 | 1,5 |
| The limit of the permissible time for establishing the readings T0.9d is equal to: | |
| 0 | 20 s |
| - Cl2 and O3 (group I-2 according to GOST 13320-81) | 30 s |
| - HF (group I-5) | 300 s |
| - other gases (except CO2) (group I-4) | 90 s |
| 0 | Not standardized |
| In the display block there is a current output for each measurement channel | 0 - 5 mA (customer request 4-20 mA) |
| Conversion functions for: | |
| - 0 - 5 mA | C = I*k1, mg/m3, μg/m3, mg/l, vol. % |
| - 4 - 20 mA | C = (I-4)*k2, mg/m3, μg/m3, mg/l, vol. % |
| Where C is the concentration of the measured gas in units according to Table 1; I - current output value, mA; k1, k2 - specific concentration (mg/m3, μg/m3, mg/l, vol.% / 1 mA) | |
| Computer connection | RS232 or RS485 |
| On the terminal block of the switching unit there are three terminals to which the “dry” relay contacts are connected | Normally open contact (NO) |
| Changeover contact (PC) | |
| Normally closed contact (NC) | |
| Supply voltage of the gas analyzer HOBBIT-T | 220 V ± 10%, (50 ±1) Hz |
| Power consumption, no more: | |
| - display unit with connected sensor units | 60 W |
| - switching unit BR 16 | 40 W |
| - switching unit BR 8 | 20 W |
| The overall dimensions of the stationary gas analyzer blocks do not exceed: | |
| - sensor block | 75×75×350 mm |
| - display unit | 260×240×120 mm |
| - switching unit BR 16 | 315×240×120 mm |
| - switching unit BR 8 | 200×175×90 mm |
| The mass of the HOBBIT-T gas analyzer blocks does not exceed: | |
| - sensor block | 700 g |
| - display unit | 3500 g |
| - switching unit | 3500 g |
| Time between failures of the gas analyzer (without taking into account the service life of the sensors and battery) | 15000 h |
| Average service life of the gas analyzer (subject to replacement of sensors) | 10 years |
| Calibration interval | 1 year |
The stationary gas analyzer can withstand a concentration overload for 10 minutes in accordance with column 2 of Table 2, with the readings restored after the overload is removed after 30 minutes.
The HOBBIT-T gas analyzer display unit provides:
- direct reading of measurement results in digital form with indication of units of measurement (see table 2), chemical formula controlled gas and channel number. The nominal price of the unit of the smallest category is given in column 5 of Table 2;
- interactive mode and display of error messages during processing and calibration of critical situations;
- separate LED signaling for each measurement channel for exceeding specified thresholds of gas contamination and failure of the measurement channel, duplicated by a built-in sound signal;
- issuing control signals to the switching unit.
The switching unit of the HOBBIT-T gas analyzer is designed to control external actuators and provides current switching of no 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 both in a “daisy chain” and “star”. Completed external units load resistances, two connectors are installed on the sensor blocks (the second is used for transmitting the communication line);
- “Minimal” - the device allows connection of sensor blocks only with a “star”. Load resistors are built into the sensor blocks. There is one connector installed on the sensor blocks.
Gas analyzers series Hobbit-T performed by I21 are designed to control insufficient or excess oxygen content in the air of the working area, as well as to control dangerous gas contamination with flammable or toxic gases.
The set of measured gases and the number of control channels are specified by the consumer when ordering. One measuring channel provides control of one of the above gases at one point in the working area. The maximum number of channels is 16.
The gas analyzer consists of sensor units (according to the number of measurement channels, from 1 to 16) and a reading indication unit. To control external actuators, switching units can be included in the delivery package.
Hobbit-T in version I21 provides direct reading of measurement results in digital form with indication of units of measurement (mg/m 3, or mg/dm 3, or vol.%), chemical formula of the controlled gas, channel number.
Error messages are also displayed on the display of the stationary gas analyzer, and a digital dialogue mode is displayed during calibration and processing of critical situations.
Each channel of the measurement analyzer has a current output (0-5 mA or 4-20 mA), and it is possible to communicate with a computer using a serial interface.
For each measurement channel, a separate LED alarm is provided for exceeding specified threshold gas levels and is duplicated with a built-in audio signal.
In addition, there is a separate LED signaling for each measurement channel for a measurement channel malfunction, backed up by an audio signal.
For each measurement channel, it is possible to control external actuators using relay contacts (switching unit).
The principle of operation of the gas analyzer is based on measuring the currents of electrochemical (for O 2 and toxic gases), thermocatalytic (for the sum of flammable gases) or optical (for CO 2) sensitive elements. The sensor current is proportional to the partial pressure of the measured gas in the air. The type of sensor used is determined by the gas to be monitored.
The gas analyzer sensor unit is designed to convert the partial pressure of the measured gas into an electrical signal transmitted to the digital display unit. The sensor block contains a sensor with an amplifier circuit and a controller that provides analog-to-digital signal conversion and transmission of a serial binary code via a communication line to the reading indication block. The sensor unit is housed in a small-sized housing with a bracket and is designed for wall mounting.
Gas analyzer display unit Hobbit-T performed by I21
Display unit of the stationary gas analyzer Hobbit-T, version I21
The display unit of a multichannel gas analyzer performs the following functions: generating supply voltages for sensor units; receiving and processing signals from sensor units; displaying measurement results on the display; generation of warning signals about reaching specified gas levels (LED and sound alarms), generation of current output signals; generation of control signals for switching units; communication with a computer to change settings, calibrate and read information; selecting the display operating mode and controlling the built-in functions of the gas analyzer using buttons on the front panel of the readings display unit; providing an interactive mode when calibrating the gas analyzer.
The display unit is located in metal case with two brackets for mounting to a panel or wall.
The measurement results are displayed on a liquid crystal display. If there are two or more channels, the measured concentration values are displayed on the display one by one cyclically, starting from the first channel. The digital display shows the channel number and chemical formula of the measured gas in the top line, the measured gas concentration and units of measurement in the bottom line. There is a mode manual selection channel being watched.
To signal the achievement of threshold values of gas contamination or malfunction of measurement channels, a device is installed in the display unit sound notification and LED board. For each measurement channel there are LEDs for each specified threshold and an “Alarm” LED. The ignition of any LED is duplicated by a sound signal.
The display block has a current output for each measurement channel: 0-5 mA (standard) or 4-20 mA (optional).
Switching unit for stationary gas analyzers Hobbit-T, version I21
The switching unit is designed to control external actuators (fan motor starters, sirens, etc.). BR-10 switching units can be manufactured with varying amounts relay (from 1 to 10, for different numbers connected external devices). If you need to connect more than 10 devices, then several switching units are used. The signals that control the operation of the switching units are supplied from the display unit sequentially: from the display unit to the first switching unit, from the first switching unit to the second, etc.
The switching unit is not included in the standard delivery package.
Structurally, the switching unit type BR-10 is made in a unified housing for mounting on a DIN rail. Switching units use relays whose dry contacts are connected to terminal block on the front panel of the unit. Load capacity of relay contacts: 1A, 220V.
To connect one external device, the terminal block of the switching unit has the following “dry” relay contact terminals: normally open contact; switching contact; normally closed contact.
The first switching block contains control outputs for two external devices, common to all channels of the gas analyzer: “EMERGENCY” - to respond to a malfunction of any measurement channel; “SIREN” - for connecting an external sound device that duplicates the built-in sound source.
All other control outputs duplicate the state of the threshold devices of the display unit, switching when the concentration of the controlled gas exceeds the specified thresholds: the lighting of the LED “CHANNEL No.. THRESHOLD No..” on the indication unit is duplicated by switching the corresponding output of the switching block - “CHANNEL No.. THRESHOLD No..” ."
Switching units BR-10 allow you to program the operation of the relay according to certain conditions. Programming is carried out by the manufacturer on the instructions of the customer, or by the customer independently using special software supplied upon request.
The blocks of the Hobbit-T gas analyzer in the I21 version are connected by four-wire cables with a cross-section copper wire not less than 0.75 mm 2. Recommended cable brands: PVS 4x0.75 or LIYY 4x0.75.
The HOBBIT-T gas analyzer is designed to measure the contents of toxic gases, explosive gases, oxygen, carbon dioxide. Ensuring safe working conditions and use in emergency protection systems (Permit of the Gosgortekhnadzor of the Russian Federation No. RRS 04-10698 for release and use dated 02/17/2003)
The HOBBIT-T gas analyzer can withstand an overload three times higher than the upper threshold for 10 minutes, with readings restored after the overload is removed after 30 minutes.
The gas analyzer display unit provides direct reading of measurement results in digital form with indication of units of measurement, chemical formula of the controlled gas and channel number. Provides display of error messages and dialog mode during calibration and handling of critical situations. The display unit has a 0-5 mA current output for each measurement channel (4-20 mA upon customer request) with conversion functions. Communication with a computer is provided using a serial interface RS232 or RS458. Provides separate LED signaling for each measurement channel for exceeding specified thresholds of gas contamination and failure of the measurement channel, duplicated by a built-in audio signal. Provides control signals to the switching unit.
The switching unit, in turn, is designed to control external actuators and provides switching current of no more than 1 A, at a voltage of 220 V 50 Hz. On the terminal block of the switching unit there are three terminals to which the “dry” relay contacts are connected.
The supply voltage of the gas analyzer is 220 V 50 Hz. Power consumption no more than 100 W.
DEVICE AND OPERATION
The operating principle of the gas analyzer is based on measuring the currents of electrochemical, thermocatalytic or optical sensitive elements. The sensor current is proportional to the partial pressure of the gas it measures in the 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 allow parallel connection on one line (one 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 display unit. The sensor blocks contain sensors with circuits for amplifying and matching the electrical signal, and a controller with peripheral microcircuits that provide analog-to-digital signal conversion and communication with the display unit in the RS485 standard. Operation in the RS485 standard allows parallel connection up to 16 sensor units per communication line.
The switching unit is designed to control external actuators. For example, air supply and motor starters exhaust ventilation, switched on when gas pollution thresholds established by standards are reached. The gas analyzer is equipped with two types of switching units BR 8 and BR 16 with the number of groups of switching contacts 8 and 16, respectively.
The display unit provides the generation of supply voltages for sensor units, reception and processing of signals from sensor units, display of measurement results on the display, generation of personnel warning signals about reaching specified gas levels (LED and sound alarms), current output signals, switching unit control signals, communication with a computer , selecting the display operating mode and controlling the built-in functions of the gas analyzer using 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 a nameplate attached to the sensor block. The indication of measurement results for each channel in the display unit strictly corresponds to this number, regardless of which connector labeled “to sensors” it is connected to.
The measurement results, queries and messages from the gas analyzer are displayed on the LCD screen. If there are two or more channels, the concentrations are displayed cyclically alternately. measured by channels starting from the first. There is a mode for manual selection of the 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 specified threshold and an “alarm” LED. The ignition of any LED is accompanied by a sound signal.
My personal opinion: the HOBBIT-T gas analyzer has some disadvantages, firstly the price, secondly there is no way to simultaneously monitor at least 2 or 3 channels, there is no way to turn off the built-in sound alarm, they are not divided into colors and it is inconvenient to observe the threshold LEDs, it is inconvenient to install , the weight of the sensor units is high and appearance wishes for improvement. But there is also a plus, which in some cases outweighs the disadvantages, is the ability to take any (dry) contacts for each channel separately, i.e., if necessary, you can connect an external actuator to any response threshold from any channel.