ROOTECH Accura MD-GAS User manual

ACCURA MD-GAS
Combustible GAS Measuring Module
User Guide[English]
Revision 1.30 2018/04/12

Notice
Accura MD-GAS User Guide
Page 2
ⓒ2014 Rootech Inc. All Rights Reserved
Notice
About Manual
Rootech Inc. reserves the right to make changes in the device specifications shown in this User Guide without
notice. Rootech Inc. advises customers to obtain the latest specifications of device before giving orders to
confirm that the information being relied on by the customer is up to date.
In the absence of written agreement to the contrary, Rootech Inc. assumes no liability for Rootech Inc.
applications assistance, customer’s system design, or infringement of patents or copyrights of third parties by or
arising from the use of devices described herein.
The information contained in this document is believed to be accurate at the time of publication, however,
Rootech Inc. assumes no responsibility for any errors which may appear here and reserves the right to make
changes without notice.
Limitation of Liability
Where applicable law allows and does not prohibit or restrict such limitation, Rootech, Inc’s liability for
anything relating to this product shall be limited to the price paid for the product.

Accura MD-GAS User Guide
Warranty
ⓒ2014 Rootech Inc. All Rights Reserved
Page 3
Warranty
For products and software that are sold or licensed by Rootech Inc. during the period from the date of receipt
by you until the present, Rootech warrants only to the original purchaser.
The purchased products shall be substantially free from material defects in material and workmanship by
Rootech for two years from the date receipt by you.
The software itself is provided “as is”without any warranty of any kind.
In order for the original purchaser to make a claim under the warranties described above, the original
purchaser must promptly contact Rootech headquarter. After receiving such notice, Rootech may either in
Rootech’s sole discretion, examine the product at the original purchaser’s site or issue shipping instructions to
the original purchaser to return the relevant product to Rootech for examination at the original purchaser’s
expense, transportation charges prepaid.
If after examining the product Rootech reasonably confirms that such examined product does not meet the
warranties, then the original purchaser’s sole remedy and Rootech’s sole obligation or liability shall be, at
Rootech’s option, to repair, replace or refund the price paid for that product.
Limitation of Warranty
The Warranty does not apply to uninterrupted or error-free operation of the Product or cover normal wear and
tear of the product or costs caused by the removal, installation, or troubleshooting of the customer's electrical
systems.
The warranty claims for defects caused by any of the following factors are not covered.
Improper use(alteration, accident, misuse, abuse) or Failure to act in accordance with installation,
operation or maintenance instructions
Unauthorized modifications, changes or attempted repairs
Failure to comply with applicable safety standards & regulations
Damages when transporting or storing
Damages by force majeure, examples are(not necessarily limited): fire, flood, earthquakes, storm damage,
overvoltage & lightning
If the original identify markings(trade-mark, serial number, etc) have been defaced, altered, or removed
Rootech shall not be liable for any other claim than a claim solely for the breach of one of the above warranties

Warranty
Accura MD-GAS User Guide
Page 4
ⓒ2014 Rootech Inc. All Rights Reserved
that is made in accordance with the above described procedures- made by the original purchaser, its
employees, agents, or contractors for any loss, damage, or expense incurred due to, caused by, or related to
any purchased product.
Any technical assistance provided by Rootech's personnel or representatives in system design shall be deemed
to be a proposal and not a recommendation. The responsibility for determining the feasibility of such proposals
lies with the original purchaser and should be tested by the original purchaser.
It is the original purchaser’s responsibility to determine the suitability of any product and associated
documentation for its purposes. The original purchaser acknowledges that 100% "up" time is not realizable
because of possible hardware or software defects. The original purchaser recognizes that such defects and
failures may cause inaccuracies or malfunctions.
Only the terms expressed in these limited Warranties shall apply and no distributor, corporation or other entity,
individual or employee of Rootech or any other entity is authorized to amend, modify or extend the Warranties
in any way.
Standard Compliance
Process Control Equipment
E324900
MSIP-REM-RTE-ACCURA-MD-GAS
QMS-1347
KAB-QC-09

Accura MD-GAS User Guide
Revision History
ⓒ2014 Rootech Inc. All Rights Reserved
Page 5
Revision History
The following versions of Accura MD-GAS User Guide have been released.
Revision
Date
Description
1.00
2014. 8. 7
Initial draft
1.10
2014. 9. 15
Temperature, humidity added
Setup mode added and changed
Event mode added
1.11
2014. 11. 21
PPM conversion upgraded by Methane Gas Standard
1.20
2014. 12. 18
Limitation of Liability, Standard Compliance, Warranty Condition, and Contents
added
1.21
2015. 1. 8
Range of operating power supply input voltage expanded
1.22
2015. 2. 10
Standard Compliance modified
1.23
2015. 3. 17
Photo error of setup mode modified
1.30
2018. 4. 12
Adding definite time attribute of event

Contents
Accura MD-GAS User Guide
Page 6
ⓒ2014 Rootech Inc. All Rights Reserved
Contents
Chapter 1 Installation and Wiring .........................................................................................................................7
Before you begin................................................................................................................................................ 7
Components ............................................................................................................................................... 7
Dimension .................................................................................................................................................. 7
Installation......................................................................................................................................................... 8
Panel Mounting ........................................................................................................................................... 8
DIN-Rail Mounting ...................................................................................................................................... 9
Wiring ........................................................................................................................................................ 9
Chapter 2 Accura MD-GAS Operation/Setup.......................................................................................................10
Power Supply ................................................................................................................................................... 10
Function........................................................................................................................................................... 10
Gas Measurement and Event ..................................................................................................................... 10
Digital Output ........................................................................................................................................... 11
Operation Mode ....................................................................................................................................... 12
Button Function ......................................................................................................................................... 13
LCD Screen...................................................................................................................................................... 14
Display Mode............................................................................................................................................ 14
Event Mode............................................................................................................................................... 14
Setup Mode............................................................................................................................................... 15
LED Display ..................................................................................................................................................... 18
APPENDIX A Specification...................................................................................................................................19
APPENDIX B Ordering Information ......................................................................................................................20

Accura MD-GAS User Guide
Chapter 1 Installation and Wiring
ⓒ2014 Rootech Inc. All Rights Reserved
Page 7
Chapter 1 Installation and Wiring
Before you begin
Components
Fig 1.1 Accura MD-GAS Components
Accura MD-GAS
Mounting hole(L)
Mounting hole(S)
Two screws
RJ12 6C communication line
Dimension
Fig 1.2 Accura MD-GAS Front Dimension
Fig 1.3 Accura MD-GAS Rear Dimension

Chapter 1 Installation and Wiring
Accura MD-GAS User Guide
Page 8
ⓒ2014 Rootech Inc. All Rights Reserved
Fig 1.4 Accura MD-GAS Side Dimension
Installation
Panel Mounting
Fig 1.5 Panel Mounting

Accura MD-GAS User Guide
Chapter 1 Installation and Wiring
ⓒ2014 Rootech Inc. All Rights Reserved
Page 9
DIN-Rail Mounting
Fig 1.6 DIN-Rail Mounting
Wiring
①Power supply connection[+/-]: External power supply DC voltage 9 - 24V connected.
②DO contact point connection.
Fig 1.7 Power Supply and DO Wiring

Chapter 2 Accura MD-GAS Operation/Setup
Accura MD-GAS User Guide
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ⓒ2014 Rootech Inc. All Rights Reserved
Chapter 2 Accura MD-GAS Operation/Setup
Fig 2.1 Accura MD-GAS Front View
Power Supply
Item
Description
Connector type
Terminal block[+/-]
Wire
1.5 to 3.5 mm2[16 to 12 AWG]
Power Supply Range
DC voltage 9 - 24V ± 10%
Current consumption
90mA @ DC 24V
with DO[Digital Output] relay ON
200mA @ DC 9V
Function
Gas Measurement and Event
Item
Description
Gas Sensor
Model
TGS 813
Type
Tin dioxide[SnO2] semiconductor
Detection
Wide range of combustible gases
Gas concentration measuring range 1
100 - 10,000 [ppm]
Gas event
Over event for event threshold value 2
1. It is ppm[parts per million] concentration as shown in Fig 2.2: Gas sensor output resistance is estimated as the average
value 10kΩat methane Gas 1000 ppm environment and Gas sensor load resistance 18kΩis connected.
2. Over event consists of a start event and an end event.

Accura MD-GAS User Guide
Chapter 2 Accura MD-GAS Operation/Setup
ⓒ2014 Rootech Inc. All Rights Reserved
Page 11
Fig 2.2 Relationship between Sensor Resistance and concentration ppm
Digital Output
When event occurs, PPM maximum value blinking display, event LED blinking display and DO output are
executed.
Channel 1
Connector name
DO1
Ground
DO1G
Item
Description
Connector type
Terminal block
Wire
1.5 to 3.5 mm2[16 to 12 AWG]
Output type
Latch/ Periodic pulse 1
Turn-on time
Max. 6msec
Turn-off time
Max. 3msec
Isolation
AC 2,000V 1 minute
Maximum rating
AC 250V 5A, DC 110V 0.3A, DC 30V 5A
1. Latch is a type in which the state is maintained, and periodic pulse is an On pulse type repeated at configured period
interval. Pulse shape is defined as period and on time.

Chapter 2 Accura MD-GAS Operation/Setup
Accura MD-GAS User Guide
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ⓒ2014 Rootech Inc. All Rights Reserved
Fig 2.3 DC Relay Application
Fig 2.4 AC Relay Application
Note
It is recommended to use a clamp diode or varistor to prevent the digital output from exceeding the rated
voltage during switching.
Operation Mode
Mode
Description
Display Mode
Sequentially display the measured PPM value and DO output status.
Event Mode
If the start event generates, automatically changes to event mode.
PPM maximum value blinking display, event LED blinking display and DO output are
executed when event occurs.
Event mode is cleared by the user’s long pressing of SET button and the display screen is
changed to display mode.
Setup Mode
Configures event and DO, and controls DO.

Accura MD-GAS User Guide
Chapter 2 Accura MD-GAS Operation/Setup
ⓒ2014 Rootech Inc. All Rights Reserved
Page 13
Button Function
SET button is used to clear the event mode, or check and change the setup items.
Event Mode Clear
Button
Function
[Display Mode]
Sequentially display the measured PPM value and DO output status.
[Event Mode]
Automatically changed when event generates.
Auto change
PPM maximum value blinking display, event LED blinking display and DO
output are executed when event occurs.
Long press 1
Event mode is cleared by the user’s long pressing of SET button and the
display screen is changed to display mode. When event mode is cleared,
event LED is also turned off and DO output 2is also cleared.
1. Press one second and release button.
2. DO output is user-configurable to be automatically cleared when end event is detected.
Setup and Confirm
Button
Function
[Display Mode]
Sequentially display the measured PPM value and DO output status.
[Setup Mode]
Short Press 1
Go to setup mode.
[The setup menu is sequentially selected each time it is pressed.]
Long press 2
Enter setup change mode.
Make the setup value changeable [blinking].
Short Press
Select the setup value.
[Each time you press it, the setup value will change sequentially.]
Long press
Saves the selected setup value [Blinking Stop].
[Go to the next setup menu]
1. Press and release immediately.
2. Press one second and release button.
Note
If no button pressing for 10 seconds in setup mode, it automatically returns to display mode.
If no button pressing for 25 seconds in setup change mode, it automatically returns to display mode.

Chapter 2 Accura MD-GAS Operation/Setup
Accura MD-GAS User Guide
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ⓒ2014 Rootech Inc. All Rights Reserved
LCD Screen
Display Mode
The measured PPM value and DO output status are displayed and the screen moves sequentially as shown
below. In display mode, short pressing of SET button makes the screen move to setup mode.
PPM
DO 출력상태
Gas PPM Display
Gas sensor output voltage of Accura MD-GAS is displayed by ppm value converted as shown in Fig 2.2.
Display
Description
PPM [d][d][d] 1
Gas PPM [parts per million]
100 –10.0k
100 ppm to 10000 ppm are displayed.
1. d decimal value.
DO Status Display
Display
Description
CLS [Closed]
DO Closed status display
OPN [Open]
DO Open status display
Event Mode
It automatically moves to event mode when start event occurs. In event mode, maximum PPM value and event
LED are blinking and DO is also executed. It automatically clears the existing maximum PPM value internally at
new start event and detects the new maximum value again from the start event point. Thus, it is the maximum
PPM value of the most recent event.
Gas PPM Maximum Display
Display
Description
MaX [d][d][d] 1
Gas Maximum PPM
k segment
Displays thousands of units.
1. d decimal value.
Event Mode Clear
By long-pressing of SET button, event mode is cleared and switches to display mode. When event mode is
cleared, event LED is turned off and DO contact is also cleared. DO is user-configurable to be automatically
cleared upon detection of end event. For details, refer to “Setup Mode>DO clear”section.

Accura MD-GAS User Guide
Chapter 2 Accura MD-GAS Operation/Setup
ⓒ2014 Rootech Inc. All Rights Reserved
Page 15
Setup Mode
Each time SET button is pressed briefly, the next setup menu is selected.
Event
Event
Threshold1
Event
Hysteresis1
Definite
time 1
DO
Type
DO
Period 2
DO
On time 2
DO
Polarity
DO
Clear
DO
Control 3
1. If event setup is Off, it is not displayed.
2. If DO type setup is Latch, it is not displayed.
3. If event setup is On, it is not displayed.
Note
If no button pressing for 10 seconds in setup mode, it automatically returns to display mode.
If no button pressing for 25 seconds in setup change mode, it automatically returns to display mode.
Event setup
When event is set to on, event LED is turned off and DO is cleared according to DO polarity.
Event
oFF[Off]
Event operation disable
on[On, default]
Event operation enable
Over event 1occurs when a certain time elapses after exceeding the
reference value.
1. Over event consists of a start event and an end event.
Event Threshold
Event threshold value can be set only in case of event on configuration.
Event Threshold
[d][d][d] 1
Default 2000 ppm
Event threshold value
Range: 110 - 9,990 ppm [0.11k - 9.99k]
1. d decimal value.
Event Hysteresis
Event hysteresis value can be set only in case of event on configuration.
Event Hysteresis
[d][d][d] 1
Default 500 ppm
Event hysteresis value
Range: 10 - 999 ppm
1. d decimal value.

Chapter 2 Accura MD-GAS Operation/Setup
Accura MD-GAS User Guide
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ⓒ2014 Rootech Inc. All Rights Reserved
Event Definite Time
Event definite-time can be set only in case of event on configuration.
Event Over Time Delay
[d].[d] 1
default 1.0 sec
0.5 –5.0 sec / 0.5sec step
1. d decimal value.
Item
Description
Start level
Event threshold value
End level
Event threshold value –Hysteresis value
Start event
If the input value goes over the start level and the definite time elapses, start event generates. In case
that the start event generates, start event regenerates only when the input value goes over the start
level again after the end event generated as the input value goes below the end level.
Event LED blinks only by the start event.
End event
End event generates if the input value goes below the end level after the start event generated.
Event LED goes off not by the end event, but by the user’s SET button input.
Hysteresis
As many events can generate in case that the input value repeats going over and below the event
threshold value, proper hysteresis setup is needed for the effective event management.
DO Type
DO Type
Lat[Latch, default]
Status that the contact point is continually maintained.
PuL[Pulse]
Repeated pulse at the configured period interval.
DO Period
DO period can be set only in case that DO type is pulse.
DO Period
[d][d].[d] 1
Period for pulse [second]
Default 0.4 sec
Range: 0.2 - 65.5 seconds
1. d decimal value.
DO On Time
DO on time can be set only in case that DO type is pulse.
DO On time
[d][d].[d] 1
On time for pulse [second]
Default 0.2 sec
Range: 0.1 - 65.4 seconds
1. d decimal value.

Accura MD-GAS User Guide
Chapter 2 Accura MD-GAS Operation/Setup
ⓒ2014 Rootech Inc. All Rights Reserved
Page 17
DO Polarity
DO Polarity
nrM[Normal, default]
Initial open contact. Closed contact output in case of event.
rEu[Reverse]
Initial closed contact. Open contact output in case of event.
DO Clear
DO Clear Type
btn[Button-clear, default]
DO is cleared when SET button is long-pressed.
SLF[Self-clear]
DO is automatically cleared at the time of end event.
When the start event occurs, DO operates, and there are two ways of clearing DO. The first is the external
clearing by user's SETUP button input, the second is the internal automatic clearing at the end event time. This is
determined by DO clear setup.
Fig 2.5 LED/DO Operation [Button input after end event @ DO button-clear setup]
Button clear
Button clear
threshold
Gas Over
Start Event
End Event
Button Clear
LED
DO (latch)
DO (pulse)
ppm
with hysteresis
start event end event
Fig 2.6 LED/DO Operation [Button input after end event @ DO self-clear setup]
Button clear
Self clear
threshold
ppm
with hysteresis
Gas Over
Start Event
End Event
Button Clear
LED
DO (latch)
DO (pulse)
start event end event

Chapter 2 Accura MD-GAS Operation/Setup
Accura MD-GAS User Guide
Page 18
ⓒ2014 Rootech Inc. All Rights Reserved
Fig 2.7 LED/DO Operation[Button input during event: All cleared unrelated to DO clear setup]
Button clear
Button clear
threshold
Gas Over
Start Event
End Event
Button Clear
LED
DO (latch)
DO (pulse)
ppm with hysteresis
start event end event start event
DO Direct Control
DO can be controlled directly only when event off is set. Even if DO is in the closed state, DO output is cleared
when event setup is on.
DO Direct Control
_ (Underline) [Default]
Open contact point output
o (Small Letter o)
Closed contact point output
LED Display
In Accura MD-GAS module, when start event occurs PPM maximum value screen is blinking and event LED is
also blinking and the DO output is activated.
Event LED
RED LED
Red LED blinks to display the status that event generates.
Event LED blinking and DO can be cleared by long-pressing
at event mode.
If DO clear setup is self-clear, DO is automatically cleared at
the end event time.

Accura MD-GAS User Guide
Appendix A Specification
ⓒ2014 Rootech Inc. All Rights Reserved
Page 19
APPENDIX A Specification
Gas Concentration PPM
Description
Gas Sensor
Model
TGS 813
Type
Tin dioxide[SnO2] semiconductor
Detection
Wide range of combustible gases
Gas concentration measuring range 1
100 - 10,000 [ppm]
Gas event
Over event for event threshold value 2
1. It is ppm[parts per million] concentration as shown in Fig 2.2: Gas sensor output resistance is estimated as the average
value 10kΩat methane Gas 1000 ppm environment and Gas sensor load resistance 18kΩis connected.
2. Over event consists of a start event and an end event.
Digital Output
Description
Connector type
Terminal block
Wire
1.5 to 3.5 mm2[16 to 12 AWG]
Output type
Latch/ Periodic pulse 1
Turn-on time
Max. 6msec
Turn-off time
Max. 3msec
Isolation
AC 2,000V 1 minute
Maximum rating
AC 250V 5A, DC 110V 0.3A, DC 30V 5A
1. Latch is a type in which the state is maintained, and periodic pulse is an On pulse type repeated at configured period
interval. Pulse shape is defined as period and on time.
Power Supply
Description
Connector type
Terminal block[+/-]
Wire
1.5 to 3.5 mm2[16 to 12 AWG]
Power Supply Range
DC voltage 9 - 24V ± 10%
Current consumption
90mA @ DC 24V
with DO[Digital Output] relay ON
200mA @ DC 9V
General
Description
Weight
98 g
Mounting hole L/S excluded
101 g
Mounting hole L/S included
Temperature and Humidity
Description
Operating temperature
-20 to 70C[-4℉to 158℉]
Safety temperature 1
-20 to 65C[-4℉to 149℉]
Storage temperature
-40 to 85C[-40℉to 185℉]
Operating humidity
5% to 95%, non-condensing
1. Conforms to UL61010-1

Appendix B Ordering Informaiton
Accura MD-GAS User Guide
Page 20
ⓒ2014 Rootech Inc. All Rights Reserved
APPENDIX B Ordering Information
Model
Accura MD - GAS