mru 400GD User manual

USER MANUAL
6812EN
400GD

MRU
2 / 16 400GD Version 01
Legal notices / Intellectual property rights comments
Original user manual
© 2018 by MRU
No part of this manual may be published in any form (print, photocopy, electronic media or
any other publication form) without a written approval by the publisher.
All user trademarks and name mark descriptions, even those which are not marked as such, are
properties of the respective owners.
Edition: 2018-09-07, V01

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Content
1 Introduction.................................................................................................................................................4
1.1 Intended usage.............................................................................................................................4
1.2 The company MRU GmbH........................................................................................................5
2 Security and safety directions for the analyzer...............................................................................6
2.1 Safety manual ...........................................................................................................................6
3 Description.................................................................................................................................................7
3.1 Purpose........................................................................................................................................................7
3.2 The Analyzer..................................................................................................................................7
3.3 User interface.................................................................................................................................8
3.4 Menu structure..............................................................................................................................8
4 Operation......................................................................................................................................................9
4.1 Commissioning..............................................................................................................................9
4.2 Power up..........................................................................................................................................9
4.3 Power down....................................................................................................................................9
4.3.1 Power down .........................................................................................................................9
4.3.2 Auto-off function.................................................................................................................9
4.4 Reset..................................................................................................................................................9
5 Measuring..................................................................................................................................................10
5.1 Power supply...............................................................................................................................10
5.1.1 Charge condition of battery.........................................................................................10
5.2 Measurement..............................................................................................................................10
6 Maintenance and care...........................................................................................................................12
6.1 Maintenance................................................................................................................................12
6.2 Care.................................................................................................................................................12
7 Appendix....................................................................................................................................................13
7.1 Technical data.............................................................................................................................13
7.2 Accuracy of the Pre-Calibrated sensors.............................................................................13
7.3 Service menu...............................................................................................................................14
7.4 Firmware update........................................................................................................................14
8 Declaration of conformity...................................................................................................................15

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Version 01
Introduction
400GD
1
Introduction

This manual is an important part of your delivery. It explains the usage and
purpose of the MRU Multi-Gas detector 400GD.
Please read this manual carefully and make yourselves familiar with the
400GD before using it.
The GD400 may only be used by skilled personnel and may only be
used for its intended purpose.
Please pay special attention to the security and warning signs, to avoid
personal injuries and damaging the product.
MRU can’t be held responsible for damages or injuries, by mot following the
instructions in this manual.
Always keep the manual near you when working with the analyzer, to be
able to read instructions as needed.
1.1
Intended usage
The multi-purpose GD400 is available with different interchangeable
sensor heads and can be used:
Gas Leak detector to detect gas leaks in an installation area
Spillage test to locate leaks at flue pipes
The analyzer detects measurement components and displays them.
The instrument was manufactured according relevant norms and
regulations. It must be used within its intended use.
The analyzer may not be modified from the design or safety engineering.
Modifications of any kind by the user will render the declaration of
conformity.
This analyzer meets the requirements of the valid
European and national regulations.
You can find the declaration of conformity in the
appendix.

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Introduction
1.2
The company MRU
The Analyzer is manufactured by the MRU GmbH in Neckarsulm, Germany
(founded in 1984), a medium sized company that specializes in
developing, producing and marketing high quality emission monitoring
analyzers. MRU GmbH manufactures a wide range of instruments, from
standard analyzers up to tailor made industrial analyzers
Plant 1: Sales, Service, R&D
Plant 2: Production
MRU GmbH
Fuchshalde 8 + 12
74172 Neckarsulm - Obereisesheim
GERMANY
Phone [phone] (Front office)
Phone [phone] (Service)
Fax [phone]
Email: [e-mail]
Internet: www.mru.eu

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Hinweise zum Gerät und zur Sicherheit
400GD
2
Security and safety directions for the analyzer
2.1
Safety manual
All general information and safety precautions of MRU products are listed in
the supplied separate safety manual.
Therefore, this manual must be read and observed before the first use of the
analyzer.
Instrument-specific safety and warning requirements in this manual are
prefixed before dangerous actions.
2.2
Safety precautions
The used categories of safety precautions are here explained once more
Identifies an immediate, impending hazard that, if
ignored, will result in severe bodily injuries or death.
DANGER
WARNING
Identifies an immediate, impending hazard that, if
ignored, may result in severe bodily injuries, material
damage or death.
Identifies a possibly dangerous situation that, if
ignored, may result in minor injuries.
CAUTION
ATTENTION
Identifies a possibly harmful situation that, if
ignored, may result in dam- ages to the device or its
surroundings.
NOTE
Identifies user tips and other especially important
information.

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Description
3
Description
3.1
Purpose
The main purpose of the 400GD multi-gas detector in combination with the
exchangeable sensor heads is the detection of gases and flue gases in boiler
rooms / heating installations and test:
Surface mounted gas pipes
Check ambient air for combustible gases
Inspect manholes and cavities
Soundness of combustion systems
The 400GD can be used for other measuring tasks.
Interchangeable sensors:
HC-sensor to detect leaks at gas pipes.
Humidity sensor RM400 to detect leaks at flue pipes.
....
....
Visit our webpage www.mru.eu to see available options or talk to your MRU
representative.
3.2
The Analyzer
The analyzer has a compact and sturdy fiber glass reinforced enclosure. The
analyzer is operated using the key pad and values are displayed on the color
display.
1Flexible arm 2Display
3Keypad 4Mini-USB port
5HC Sensor HC400 (Option) 6Humidity sensor RM400 (Option)
7Sensor connector
1
2
3
5
6
7
4

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Description
400GD
3.3
User interface
All functions are being displayed on the analyzer display.
Operation is done using the keypad. “Below” each menu and displayed
screen, there are submenus available.
Keypad Start screen Measurement
3.4
Menu structure
All functions are available in the EXTRAS menu. After start up the
measurement screen is available. You will navigate between menus using
the arrow keys and OK key.
Start Start a measurement
OK Power down
Set Zero Set to zero (for HC400)
Display Display contrast, adjustable 25; 50; 75; 100%
Volume Alarm volume, adjustable 25; 50; 75; 100%
Alarm Alarm threshold, adjustable in steps of 10
Service Status vales (Battery, USB ...)
Sensor Values of the inserted sensor
Info Information about the analyzer

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Operation
4
Operation
4.1 Commissioning
The analyzer has been factory assembled, has been calibrated and is ready
to be used.
Check the instrument regarding condition and integrity after delivery.
Charge the internal battery for at least 8 hours, ☞see 5.2.
4.2
Power up – analyzer without sensor
Press and hold the OK key for at least 3 seconds. The MRU start
screen appears.
You are asked to connect a sensor. connect the sensor ☞
see 5.2
The warm up phase is displayed (only HC400) The
measurement menu is being displayed after warmup.
The analyzer is ready to measure.
4.3
Power down
4.3.1 Power down
Select OFF using the arrow keys.
Press the OK key.
The analyzer powers down.
or
Press the OK key longer.
The analyzer powers down.
4.3.2 Auto-off Function
The screen below appears if the analyzer is not used over a period.
Press ANY key to stop the
countdown and the analyzer
stays on.
Analyzer powers down if no key is
pressed.
4.4
Reset
Press both arrow keys at the same time to make a hardware reset, the
analyzer powers down.

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Measurement
400GD
5
Measuring
5.1 Power supply
The analyzer is powered by an internal MRU battery. The battery can be
charged:
With an optional USB charger (USB port)
With USB cable connected to a PC
5.1.1 Battery status indicator
The battery symbol displays the capacity of
the battery. The indicator changes its color
from green to orange to red. About 60
minutes before the battery is empty, the
battery status will start flashing in red.
The analyzer will shut down automatically once the battery is almost empty to
avoid battery damages unless the battery is being charged within one minute.
5.2
Measurement
Insert the sensor for your application until you hear the sensor click into
its position.
Power up the analyzer.
☞
see 4.2.
The analyzer will display a missing sensor, if the analyzer is powered up without
a sensor being connected.
Explosion danger in EX zones
There is a possibility of explosion in an EX zone.
The analyzer may only be used in explosion free zones.
DANGER
Danger when used improperly
Deadly accidents can be the result if the rules are not obeyed.
The analyzer may only be used for its intended purpose.
DANGER
ATTENTION
Schäden am Gerät durch Fehlbedienung
Zerstörung des HC-Sensors durch Überschreiten des Messbereichs.
Messbereich des HC-Sensors beachten, nicht überschreiten.

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Measurement
Measurement example with the HC-sensor HC400
Once powered up the sensor LED will flash and the analyzer displays
„HC400“ and “Warm-up“.
During the warm up phase, the sensor LED flashes and no measurement is
possible.
Measurement mode is active once warm is completed.
A measurement value is displayed (gas concentration) and the
measurement has started.
Exit the measurement screen by pressing OK.
Use the arrow keys to select the alarm menu
Adjust the alarm threshold values with the arrow keys (e.g. 100 ppm)
Confirm the value with the OK key.
Reset to zero if needed in the zeroing menu.
Use the arrow keys to select the start menu.
Press the OK key.
Slowly move the sensor along the pipes that are being tested.
The measured value will change when a leakage is detected, a graph
will be recorded, optical and acoustic signals indicate a gas leakage.
Measurement with different sensors are based on the same principle. The
moisture sensor RM400 has no warm up phase.

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Maintenance and care
400GD
6
Maintenance and care
6.1 Maintenance
For accurate reading we suggest an annual service and calibration of the
analyzer at a local authorized service location (www.mru.eu).
6.2
Care
This is a low maintenance analyzer:
Charge the battery if the analyzer will not be used for a longer period,
then recharge the batteries every 6 months.
Care hints for sensors:
RM400
HINWEIS
The RM400 sensors function is based upon a conducting surface, therefore
the sensor may NOT be cleaned with alcohol or distilled water. Use a saline
to clean the sensor and then let it dry...

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Appendix
7
Appendix
7.1 Technical data
Test medium Gas and ambient air Operation
temperature 5 to 50 °C (41°F to 122°F)
Storage temperature - 10 - + 60 °C (14°F to 140°F)
Battery type Li-Ion
Operation hours Up to 20h (depending on sensor type)
Display 1,8“"TFT
Enclosure material PA6GF30
IP Protection IP30
Weight ca. 230 g (0.5lbs)
Dimensions 50 x 25 x 135 mm (2” x 1” x 5”)
Mini-USB port Charge battery, connect to PC
7.2 Accuracy of the Pre-Calibrated sensors
Gas detector - HC400
Measuring range CH4 5 - 20.000 ppm
Resolution 1 ppm
Reaction time T90 < 5s
Humidity sensor - RM400
Measuring range H2O0 - 100%
Resolution 1 %
Future sensors that are not listed here can be activated in the service menu /
firmware update.

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Appendix
400GD
7.3
Service menu
The service menu is for authorized personnel only and is password
protected.
7.4
Firmware update
Firmware updates are performed using a SD card, in the extras menu
UPDATE – please ask our service department for details.

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Declaration of conformity
8
Declaration of conformity