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Instruction Manual
ExTox Control Unit
ET-1D Series
Instruction Manual
ExTox Control Unit ET-1D Series
Foreword
We thank you very much for your confidence in our products and us, the ExTox Gasmess-
Systeme GmbH.
The Control Unit ET-1D as well as all other ExTox-Products and services stand for our high quality targets. Our business is the health protection of mankind, protection of the environment and installations. We are glad to take this responsibility. Our Quality Management
System therefore follows ISO 9001 and our Production Monitoring is to keep the European
Directives 94/9/EC („ATEX“). You profit of the high reliability due to modern sensor techniques and consequent interpretation acc. to the requirements of the regulations and standards valid for industrial application.
The Control Unit of the ET-1D series is a compact and easily understandable system for single transmitters. It is completely configurable at the control unit to be easily in line with the different requirements and applications. By means of its interfaces it is easy to integrate even in higher control and management systems. It could be used in combination with all
ExTox Transmitters ExSens (-I) and Sens (-I).
Please do not hesitate to contact anytime in case of questions or if you require information:
ExTox Gasmess-Systeme GmbH
Max-Planck-Straße 15 a
59423 Unna
Germany
Telefon: +49(0)2303 33 247 0
Fax: +49(0)2303 33 247 10
E-mail: [email protected]
Internet: www.ExTox.de
BA_ET-1_e_2011-12-16.doc, Rev.: 16.12.2011
Software Version ET-1D: REV61207
(Subject to technical changes)
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Instruction Manual
ExTox Control Unit ET-1D Series
Content
1 Introduction
2 Features of the Control Unit of the ET-1D Series
3 Indications and Facilities of the Control Unit
4 Configuration
5 Operation of the Control Unit
5.1
Measuring Mode
5.2
Alarms
5.3
Under-Scale and Over-Scale of Measuring Range
5.4
Channel Fault
5.5
Fault of Control Unit
5.6
Programme Run Monitoring (Watchdog)
5.7
Initialisation
5.8
Service Mode
5.9
Analogue Outputs 4…20 mA (Type ET-1DA only)
6 Application
6.1
Measuring Function
6.2
Use in combination with hazardous Areas
7 Installation
7.1
Mechanical Installation
7.2
Electrical Installation
8 Maintenance of Gas Detection Systems
8.1
Basic Information
8.2
Visual Check
8.3
Functional Check
8.4
System Check
9 Technical Data and Declaration of Conformity
14
15
15
15
16
16
16
16
17
17
13
13
14
14
12
13
13
13
11
11
11
12
4
5
6
7
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Instruction Manual
ExTox Control Unit ET-1D Series
1 Introduction
This Instruction Manual generally describes operation, installation and maintenance of the following ExTox-Products:
Artikel-Nr.
Wall mounted
230 V / 24 V
DIN-Rail
230 V / 24 V
Control Panel
230 V / 24 V
19''-Rack
230 V / 24 V
Type specific data for each device should be taken from a corresponding separate and specific Data Sheet. This Data Sheet forms consequently part of this Instruction Manual. References on the Data Sheet within this text are marked with ) DB.
Please read this Instruction Manual carefully before installation and initial operation of the control unit. We kindly ask you to pay attention to all details and cross-references.
We kindly ask you not to repair the control unit or to perform any changes which go beyond the measures described herein. Otherwise you endanger your own safety and your warranty claims of merchantability. In such cases please contact ExTox or authorised ExTox Service
Partner. Third parties take the responsibility for correct performance of work when maintenance and repairs are done by them.
On receipt of goods please take care that packing and consignment are not damaged and the goods supplied correspond to the articles described in the delivery note. Please do also compare with your order. In case of any damage please inform your forwarding agent and your supplier. Please keep the damaged packing.
Please keep in mind that control units are sensitive measuring devices and take special care when unpacking and installing them.
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Instruction Manual
ExTox Control Unit ET-1D Series
2 Features of the Control Unit of the ET-1D Series
Concentrations of flammable and toxic gases as well as of oxygen are centrally evaluated by the Control Units of the ET-1D Series after measuring them safely with our ExTox transmitters. Control Units of the ET-1D Series could be combined with all ExTox-Transmitters Ex-
Sens (-I) and Sens (-I).
Other measurands such as for example temperature or pH-value can be evaluated with suitable transmitters (4-20 mA, 3-wires).
The control units are available in wall mounted housing, for DIN-Rail installation and for installation in 19''-Rack or Control Panel. The power supply can flexibly be done with 230 V or 24 V DC. On request we could supply you with corresponding uninterruptible power supplies for our control units.
The control units in combination with ExTox transmitters comply with EN 60079-29-1 and
EN 45544 for Gas Detection Systems. Furthermore they are in conformity with the European
Directives 94/9/EC (ATEX), 2004/108/EEC (EMC) and 2006/95/EEC (LVD).
Survey on the Control Unit of the ET-1D Series:
1 input channels for transmitter (4-20 mA, 3-wire)
Adjustment to be done directly at the control unit without any work at the transmitter
2 digital inputs, potential free
2 freely adjustable alarm levels per channel, latching adjustable
integrated acoustic signalling device
1 fault indication per transmitter/channel
4 relays outputs, potential free, for indication of Alarm 1, Alarm 2, horn and device fault
illuminated LC-display (4 x 20 signs) for indication of measured values, messages and alarms
menu oriented configuration of the device without further tools needed
LEDs for alarms, operation, channel fault, device fault and service mode
Service mode
horn reset
1 analogue output (Type ET-1DA only)
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Instruction Manual
ExTox Control Unit ET-1D Series
3 Indications and Facilities of the Control Unit
ET-1D
Gasmess-Systeme GmbH
LEDs:
Alarm 2 (red)
Alarm 1 (red)
LEDs:
Operation
(green)
Fault (yellow)
2
Alarm
1
Cl2 Chlor
7.0 ppm
Alarm1=ON Alarm2=ON
F1 F2 F3 F4
Betrieb
Power
Störung
Fault
ExTox G asm ess-Systeme GmbH Tel. +49 (0)231/589409-0 www.exto x.de
Display
Functional Keys
The display indication and the assignment of the selection keys F1 to F4 varies in the different operation modes of the ET-1D. The corresponding assignment of the functional keys is indicated in the line at the bottom of the graphic display.
The selection keys dispose of a repeating function that means on longer operation the selection list is quickly leafed through.
Under normal operation (Chapter 5) the display gives the following information:
1. Line: measured gas and/or measurand, actual measured value with unit
2. Line: bar graph indication of the actual measured value. The indicated values range from 0 to 100 % of measuring range.
3. Line: setting of alarm levels 1 and 2
4. Line: setting of the functional keys F1 to F4. The menus for configuration of the parameters (Chapter 4) could be reached via F1 (NEXT). Functional key F2 serves to quit the alarms (see Chapter 5.2). Functional key F3 can be used to quit the integrated acoustic signalling device and horn relay. Under normal operation the functional key F4 is not set.
If you leave indication under normal operation by pressing F1 (NEXT) you reach the configuration menus. The evaluation of measured values is continued unaffected. The configuration menus are always passed cyclically in rotation. Therefore you have to press functional key
F1 that often until you reach the required menu or the normal display indication again. You could see all settings, but you could not change them until you have not activated the password protected access level (see Chapter 4).
As soon as the access level is passed you can change the parameter settings by means of keys F2 and F3. With the keys F2 (^) and F3 (v) you can stepwise increase or decrease the values or leaf through a given list. In case only key F2 is set with (^v), the settings change between two alternatives. Made changes are stored by pressing F4 (SAVE). The changes are activated after leaving the menu. If you leave the menu without pressing F4 (SAVE) the former stored values remain valid and all made changes get lost.
If there is no setting done for more than 10 minutes the display automatically changes to the indication under normal operation (except the service mode is activated).
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Instruction Manual
ExTox Control Unit ET-1D Series
4 Configuration
Configuration of the ET-1D comprises all parameter settings to customise the functionality of the device to the requirements of your application. This covers for example measured gas, measuring range, alarm levels, etc.
If not otherwise indicated, evaluation of measured values, alarms and faults is done during configuration as per under normal operation.
You will find the description of the configuration possibilities in the below mentioned table.
It follows the menu structure of the ET-1D.
The following information is given for each parameter:
Menu text: denomination in the menu on the display
Selection: setting of the parameters
Function: description of the impacts on the condition of the gas detection system.
Attention: to be able to perform any changes you have to activate the code protected access level first.
Menu text Selection Function
Password ----
Password
Service
(Inputs locked)
O.K.
Password released
GB, D
Off, On
Release is done by pressing the functional keys F3 and
F4 simultaneously for ca. 5 s.
Pressing the two keys for ca. 5 s again cancels the release.
Release is automatically reset if the keys are not used for more than 10 minutes.
Attention: During service mode (Service = On) the release remains permanently.
In the release menu it could be switched between the languages German (D) and English (GB). Please press the key F2 until the indication on the display changes.
GB → D:
D → GB:
English activated
German activated
Alarm and fault messages as well as especially the relay outputs are locked during service mode. The service condition is indicated by a blinking operation LED and the service relay (see Chapter 5.8).
Gas List of gases and measurands
Displays the chemical totals formula belonging to the measured gas or the denomination of other measurands. The selected denomination is indicated on the display during measuring operation.
%
% LEL, pH, degrees
Unit for the measuring range. The selected denomination is indicated on the display during normal operation.
Dec. Point
Range
0,
0.0
0.0 bis 3000.0,
0 bis 30000
It is fixed whether the measured value is displayed with decimal point.
Attention: The change of this parameter affects also the settings of end value of measuring range and alarm levels.
Fixes the end value of measuring range.
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Menu text
Alarm 1,
Alarm 2
Selection
0 to range
Quit A1,
Quit A2
Relay mode A1,
Relay mode A2,
Relay mode F,
Relay mode H
On,
Off
A2,
---
Closed,
Opened
Instruction Manual
ExTox Control Unit ET-1D Series
Function
Fixes the two alarm thresholds and the direction of exceeding for triggering of alarms. a.
Values of alarm thresholds are in ascending order: alarms are triggered on exceeding.
Example flammable gases:
Alarm 1: 20 % LEL, Alarm 2: 40 % LEL b.
Values of alarm thresholds are in descending order: alarms are triggered on under-run.
Example Oxygen Monitoring:
Alarm 1: 19 % (v/v) O
2
, Alarm 2: 17 % (v/v) O
2
Please note that due to that reason both alarm levels have to differ at least for a minimum.
Indicates whether the alarm and the corresponding relay is latching (ON) or not latching (OFF). See Chapter 5.2.
A non latching alarm stops if the alarm condition is no longer present. Please keep in mind the alarm hysteresis (see below).
A latching alarm has always to be reset manually via key F2 (QUIT). grated acoustic signaller) is connected to Alarm 1 or 2.
On indication "---" both are deactivated.
The horn relay can be reset via key F3 (HORN), even if the alarm condition is still present.
Attention: This function should only be used for external acoustic signallers.
Hint: The horn is triggered again, if the alarm level is reached again after an interruption in the meantime
("re-triggering of alarms). This is also valid if a latching alarm has not been quit in the meantime.
Indicates whether the alarm, fault or horn relay closes
(Closed) or opens (Opened) on presence of triggering conditions.
Closed: the relay is closed during measuring operation without alarm or fault activated (5.1).
Opened: the relay is open during measuring operation without alarm or fault activated (5.1).
With the setting you choose whether an interruption of power supply at the ET-1D will release an alarm
(Closed) or not (Opened). Independently the choice of the two-way contact of the relays determines whether you use the open or closed current principle.
In safety-related circuits the mode Closed in conjunction with the closed-current principle will be used in principle normally. But to active optical or acoustic indication the mode Opened is provided in most of the applications
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ExTox Control Unit ET-1D Series
Menu text
Hyst.
Selection
0 % to 10 %
Function
Fixes the alarm hysteresis in percent of the measuring range. A non-latching alarm lapses only if it is the value of hysteresis below the alarm level. By means of this permanent repetition of alarm triggering due to slight fluctuation of measuring values near the alarm level are avoided. Example: Measuring range 100 ppm, Hysteresis 3 %, Alarm level 10 ppm. Alarm will deactivated when the measuring value is below 7 ppm.
Standard setting: 0 %
Attention: Combination of low alarm levels with great hysteresis may involve that alarms will be deactivated never or very late.
NPC 0 to 5 % Zero point attenuation can be adjusted. The range of values from 0 to + NPC of measuring range is indicated as zero. In the subsequent range up to + 2·NPC of measuring range a fluent approach to a linear curve takes place.
This function enables the suppression of small indication changes in the display without affecting the indication behaviour around the alarm levels. But alarm levels shall not
Standard setting: 0 %, that means, deactivated.
I ist
: The actual unevaluated value of the transmitter output current which rests at the input of the control unit is displayed.
The two last menu items serve for the adjustment of the control unit without any work to be necessary at the transmitter.
Adjustment is done in two steps:
1.
When applying zero gas first the zero point (NP) is as long changed as the value indicated on the display is ISTWERT 0. Please note that negative values are described as "<
0". If the adjustment is done correctly the preset "<" disappears and exactly 0 is described.
2.
Then when applying test gas GAIN is adjusted until the actual value indicated on the display corresponds to the nominal value.
Zero 2.000 to 6.000 State of the zero point. In case of value 4.000 [mA] there is no correction done.
ACTVALUE: the measured value corrected in ZERO and eventually GAIN is displayed.
Gain 0.500 to 2.000 Correction value for the gain. For explication please see text above. In case of value 1.000 there is no correction done.
ACTVALUE: the measured value corrected in ZERO and eventually GAIN is displayed.
Remarks for calibration/ adjustment at the control unit
The ET-1D is usually used with transmitter which dispose of a 4-20 mA output with linear curve, that means an input current of 4 mA is interpreted as zero point and an input current of 20 mA is interpreted as end value of measuring range. In between conversion is done linearly according to the following formula:
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Instruction Manual
ExTox Control Unit ET-1D Series
Measured value = measured current
16 mA
− 4 mA
⋅ End value of measuring range
Corrections of the settings are usually done at the transmitter itself and not at the control unit.
In case this is impossible, such as for example due to the fact that the transmitter is hardly accessible for maintenance purposes or it should not be opened during operation, the ET-1D offers the possibility of a device internal adjustment. Therefore the determined current value is converted with an offset factor and a gain factor directly after recording of the transmitter signal. After that formation and evaluation of measured values are done. All necessary settings can be done in the menus ZERO and GAIN.
Attention: The range of correction values is limited to restrict the adjustment to convenient tolerance range as far as measuring techniques are concerned. Further corrections have to be performed directly at the corresponding transmitter.
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Instruction Manual
ExTox Control Unit ET-1D Series
5 Operation of the Control Unit
Features which are characteristic for the specific operation mode are printed in bold.
5.1
Measuring Mode
There are no faults and alarms. The measured value is within the range between 0 % and
100% of the end value of measuring range.
Please note that evaluation of the measured value is only done after zero point attenuation
NPC has been carried out (unless activated). Values near zero are inside the unavoidable tolerance range for transmitters and are therefore attenuated to avoid misinterpretation.
The real transmitter output current and with it the unprocessed raw signal can always be seen by selecting the configuration menu NPC.
Status LEDs
Alarm 1, 2 (red): off
Operation: on
Display
Actual Value:
Bar Graph:
Alarm A1, A2:
Relays actual measured value within the range 0 to end value of actual value within the range 0 to end value of measuring range alarm value settings are permanently displayed
Fault (K3) :
Horn (K4):
Integrated Signaller: not triggered not triggered mute
5.2
Alarms
Minimum one configured alarm level is triggered.
If the alarm is configured as non-latching, it stops automatically if the alarm condition is no longer present. Please pay attention to the alarm hysteresis.
If the alarm is configured as latching, it has to be reset manually via key F2 (QUIT) in case the alarm condition is no longer available. This is possible only if you are outside of any configuration menu.
The horn relay and the internal signaller can be connected to Alarm 1 or 2 or deactivated depending on parameter setting (Chapter 4: Horn). Different from the alarm relays these can be reset via key F3 (HORN), even if the alarm condition is still present.
Status LEDs
Alarm 1, 2 (red): on for the triggered alarm
Operation: on
Display
Actual Value: actual measured value within the range 0 to end value of
Bar Graph:
A1, A2: actual value within the range 0 to end value of measuring range alarm value settings are blinking
Relays
Alarm 1 and 2 (K1, K2): triggered, if alarm level is reached
Fault (K3): not triggered
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Horn (K4):
Integrated Signaller:
Instruction Manual
ExTox Control Unit ET-1D Series
triggered, if set alarm level is reached
sounds, if set alarm level is reached.
5.3
Under-Scale and Over-Scale of Measuring Range
The measured value is within the range below 0 % and above 100% of the end value of measuring range.
In case of Under-Scale of measuring range measures for correction of Zero Point should be taken. The deviation value could always be evaluated more precisely in the menu NPC by means of the transmitter output current.
In case of Over-Scale of measuring range due to high gas concentrations corresponding measures for the individual transmitter should be taken, such as for example calibration and adjustment.
Status LEDs
Alarm 1, 2 (red):
Operation: corresponding to measuring operation (5.1) or Alarm (5.2) corresponding to measuring operation (5.1) or Alarm (5.2)
Display
Actual Value:
Bar Graph:
A1, A2
< 0 or > End Value of Measuring Range
0 or end value of measuring range corresponding to measuring operation (5.1) or Alarm (5.2)
Relays
Alarm 1 and 2 (K1, K2): corresponding to measuring operation (5.1) or Alarm (5.2)
Fault (K3) : not triggered
Horn (K4):
Integrated Signaller: corresponding to measuring operation (5.1) or Alarm (5.2) corresponding to measuring operation (5.1) or Alarm (5.2)
5.4
Channel Fault
The input current of the transmitter is outside the limits fixed in the system parameters, that means below I min
= 1.5 mA or above I max
= 22.5 mA.
Reason for that might in general be a transmitter fault, interruption of transmitter power supply, interruption or short circuit of transmitter cable.
Attention: Please keep in mind that in case of channel fault the respective alarms are activated. This happens when passing the limit I tored. It happens when passing the limit I min max
if the exceeding of alarm levels is moni-
if the under-run of alarm levels is monitored.
In both cases the following details as well as the additional information as per Chapter 5.2 are valid.
Status LEDs
Alarm 1, 2 (red): corresponding to measuring operation (5.1) or Alarm (5.2)
Operation: on
Fault:
Display
on
Actual Value:
Bar Graph:
A1, A2
<< 0 or >> end value of measuring range
0 or end value of measuring range corresponding to measuring operation (5.1) or Alarm (5.2)
Relays
Alarm 1 and 2 (K1, K2): corresponding to measuring operation (5.1) or Alarm (5.2)
Fault (K3) :
Horn (K4):
Integrated Signaller:
triggered corresponding to measuring operation (5.1) or Alarm (5.2) corresponding to measuring operation (5.1) or Alarm (5.2)
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ExTox Control Unit ET-1D Series
5.5
Fault of Control Unit
A fault of Control Unit is indicated in case the internal power monitoring or memory test issues a fault. The device tries to keep normal operation, especially messages and relays are not reset. It cannot be excluded that the ET-1D is able to go into undefined condition depending on the cause of fault.
The fault of control unit is non-latching, that means the ET-1D continues normal operation in case of return to the admissible voltage range or in case of faultless passing the memory test.
Please check the power supply of the device. In case of a memory fault please contact the
ExTox-Service.
Status LED
Fault Control Unit:
Relays
on
Fault (K3) : triggered
(With the exception of the described reactions the system status can be undefined.)
5.6
Programme Run Monitoring (Watchdog)
The ET-1D disposes of a programme sequence monitoring by means of a Watchdog element working independently. In case this watchdog recognizes an interruption of the regular course it triggers a reset of the ET-1D. Then the initialisation (5.7) is passed.
If the ET-1D does not enter normal operation again, please contact the ExTox-Service.
5.7
Initialisation
After connection of the ET-1D to the power supply it is passing an initialisation phase. The installed software version and the Internet Address of ExTox are indicated on the start screen for 120 seconds. The remaining time (in seconds) until starting normal operation a countdown is displayed.
During initialisation all LEDs are periodically switched on and off so that their functionality could be checked. At the same time the complete memory (RAM/ROM/EEPROM) is checked.
This test is cyclically repeated during the measuring mode.
5.8
Service Mode
Alarm and fault messages as well as especially the relay outputs are locked during service mode. The service condition is indicated by a blinking operation LED. The service mode can be activated in the configuration menu (see Chapter 4).
During service mode the release remains permanently.
5.9
Analogue Outputs 4…20 mA (Type ET-1DA only)
A current corresponding to the transmitter measured value is issued at the analogue outputs as long as it is in the range between I put currents < I
I max
. min
or > I max min
= 1.5 mA to I max
= 22.5 mA. Transmitter out-
are indicated at the analogue outputs of the ET-1DA on I min
or
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6 Application
Instruction Manual
ExTox Control Unit ET-1D Series
6.1
Measuring Function
The use of Gas Detection Systems for explosion and health protection requires special care.
Besides qualified support of ExTox and the detailed information in the Instruction Manuals as well as Technical Data Sheets ( ) DB) there are several guides to assist you for the safe use and operation of Gas Detection Systems. These guides deal with the selection, installation, initial operation and regular maintenance.
Furthermore there could be national regulations. In Germany there are for example the guidelines of the Berufsgenossenschaften BGI 518 and BGI 836 obligatory for certain applications.
Denomination Title
Merkblatt T023,
BGI 518
Merkblatt T055,
BGI/GUV-I 8617
EN 45544-4
Merkblatt T021,
BGI 836
EN 50292
EN 50244
Gaswarneinrichtungen für den Explosionsschutz - Einsatz und Betrieb
Mess- und Warngeräte für den Explosionsschutz – Antworten auf häufig gestellte Fragen
Electrical devices used for the direct detection and direct concentration measurement of toxic gases and vapours - Part 4: Guide for selection, installation, use and maintenance
Gaswarneinrichtungen für toxische Gase/Dämpfe und Sauerstoff - Einsatz und Betrieb
Electrical apparatus on the detection of carbon monoxide in domestic premises – Guide for the selection, installation, use and maintenance
Electrical apparatus on the detection of combustible gases in domestic premises – Guide for the selection, installation, use and maintenance
DIN-Standards available at VDE-Verlag, Frankfurt or Beuth-Verlag, Berlin
BGI available at Jedermann-Verlag, Heidelberg
6.2
Use in combination with hazardous Areas
The Control Unit itself may not be installed in hazardous areas, but it is allowed to use the control unit in combination with explosion protected transmitters. Please note the corresponding installation hints for each individual transmitter.
All types of control units can be used in combination with hazardous areas of Zone 2.
Please pay attention to the remarks regarding configuration of the control unit and its function in the safety system when using the detection system in combination with hazardous areas.
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Instruction Manual
ExTox Control Unit ET-1D Series
7 Installation
7.1
Mechanical Installation
The control unit should be installed at an easily accessible place to enable the reading out of messages at every time and to ensure an easy maintenance.
Please note the indicated operation temperature ( ) DB). The ET-1D should be installed protected against weather conditions and bigger climatic fluctuations. A separate weather protection may be provided in some cases.
The dimensions for assembly and further installation dimensions to be taken from the Technical Data Sheet ( ) DB).
The type in wall mounted housing and for installation in control panels or 19''-Rack are fix screwed up. The type for DIN-Rail installation disposes of four fixtures with which the housing is snapped on the DIN-Rail. By pulling the handles standing out of the backside of the device the connection can easily be untied and the device can be taken off.
The Control Unit ET-1D may not be installed in hazardous areas.
7.2
Electrical Installation
The electrical installation may only be done by electro specialists according to the installation regulations on the subject. There are especially regulations for the Installation of Information Engineering IEC 60364 (in Germany VDE 0800) and for lightning protection according to EN 62305 (in Germany DIN V VDE V 0185). The power supply of the control unit has to meet the requirements of an arrester of Class C or of Type 2. Please make sure that there might be special requirements in case control unit and transmitters are installed in separated rooms.
The ET-1D is provided for commercial use. Attention: ET-1D is a class A device. It can cause radio interference in domestic premises. In this case suitable measures may be provided by the user.
When running the cable you should pay attention to the fact that the cables for the gas sensors should better be run separately.
On the type in wall mounted housing and for DIN-Rail installation the housing has to be opened. To do this you have to remove the blind plates on the left and right side of the front and unscrew the four screws. The cover can now be opened and tucked up. The connections are in the bottom part of the housing. The big cable gland M20x1.5 serves for the power supply cable.
On the types for installation in control panel or 19''-Rack the connection board will be mounted in a separated vat, which may be installed in the cabinet at a suitable place. Both components will be electrical connected by the included ribbon cable. If you need a lcable which is longer than the standard dimension mentioned in the ( ) DB), please contact ExTox.
As option the device may delivered as a combined "Sandwich"-version. In this case the clamps are freely accessible on the backside of the device.
The control unit starts operation automatically with connection to the power supply.
You could find the connection scheme for input and output in the Data Sheets ( ) DB) and also marked on the PCB. Connection is done via plug clamps. Remove the plug before connecting the cable to avoid mechanical damage. After the assembly is done you could connect the plug again.
The connection PCB shows a spacial separation of the transmitter inputs and the relay outputs. The overlapping of lines between these two areas within the housing and on the PCB should be avoided. It should especially be ensured that correct isolation is kept in case cables of different voltage get in contact. We recommend not removing the protection isolation directly after the cable gland but only close to the corresponding clamp.
Normally the shielding of transmitter cables shall not be feed into the ET-1D-housing. PEwires my be connected to the corresponding clamps.
Please bear in mind that the cable glands have to be firmly tightened to ensure the sufficient strain-relief. Not used cable glands have to remain closed with already installed plugs.
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ExTox Control Unit ET-1D Series
8 Maintenance of Gas Detection Systems
The following descriptions are generally valid for Gas Detection Systems of the company
ExTox GmbH consisting of the herein described control units and connected transmitters.
8.1
Basic Information
Maintenance done by specialists is an indispensable measure for checking and keeping the functionality of gas detection systems. Maintenance comprises inspection, calibration and adjustment as well as functional test of the complete system.
Most important is the testing of the connected transmitters. Control of the gas detection system and its correct functionality are also checked.
ExTox recommends for all of her supplied transmitters regular calibration and adjustment with test gas during functional and system checks. Please see also the details in the corresponding Technical Data Sheets ( ) DB). An extension to 12 months might eventually be possible in case of existing experiences on similar applications. The functionality of the Control Unit has to be tested as well.
Furthermore national valid regulations to define maintenance intervals may exist. In Germany it is for example necessary in certain applications to keep Betriebssicherheitsverordnung (BetrSichV) and the information of the professional associations T 023 und T 021 (vgl.
6.1). ExTox recommends generally speaking the application of the measures described in the information of the professional associations as well as the maximum calibration intervals even if the application does not fit into their scope.
Explosion Protection (T 023)
Maximum Intervals
Toxic Gases/Vapours and Oxygen (T 021)
1 Month (Visual Check)
4 Months (Functional Check)
1 Year (System Check)
1 Month (Visual Check)
6 Months (Functional Check)
1 Year (System Check)
You as user of the gas detection system bear the responsibility for the correct performance of the maintenance. ExTox as manufacturer can only place all necessary details to build up your specific maintenance concept at your disposal. We are glad to support you with this task and to submit a maintenance quotation acc. to your special requirements.
The results of each maintenance should be documented even if it is not specifically required.
Hereafter the main contents of the intended checks are described. You will find details in the above mentioned bulletins.
8.2
Visual Check
You have to check your system on mechanical damages, dust, dirt, state of a sampling system if included. Furthermore indications and status messages have to be checked.
8.3
Functional Check
The functional check also comprises calibration by means of application of test gases and a suitable system for application of test gas. When calibrating the indication of measured values at application of test gas is determined and compared with the nominal values. In case the settings are corrected additionally the process is called adjustment. In case of combination with sampling systems their correct function has also to be checked. It is not necessary to trigger the switching functions.
A functional check should only be done, if there is no alarm present. You should ensure the same environmental conditions during this process as valid for the measuring process. For example a transmitter used in cold storage houses should not be adjusted under normal ambient temperatures, as there might be more or less remarkable deviations depending on sensor type.
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Instruction Manual
ExTox Control Unit ET-1D Series
Make sure that measures have been taken to avoid unintended triggering and transmission of alarms before applying test gas. Activate the alarm bypass in service mode at your ExTox
Control Unit, deactivate automatically triggering protection measures or inform the responsible maintenance personnel. The measures corresponding to your application have to be determined and the person in charge for maintenance has to be familiar with all details.
8.4
System Check
The system check additionally comprises the triggering of switching functions; check of system parameters and of indication and recording facilities.
9 Technical Data and Declaration of Conformity
The Data Sheet of the control unit contains all technical data ( ) DB).
Data sheets and Declaration of Conformity are added to the documentation separately.
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