levenhuk NG35 Gas Detector User Manual

: June 1, 2024
: levenhuk

Table of Contents

levenhuk NG35 Gas Detector
Charging the device
Abnormal gas concentration
Specifications
Care and maintenance
Battery safety instructions
Levenhuk International Warranty
References
Read User Manual Online (PDF format)
Download This Manual (PDF format)

levenhuk NG35 Gas Detector

levenhuk-NG35-Gas-Detector

LED indicator
Gas-sensing hole
LCD screen
Left button
Power button
Right button
Power input

levenhuk-NG35-Gas-Detector-1

Please carefully read the safety instructions and the user manual before using this product. Keep away from children. Use the device only as specified in the user manual.
The kit includes: gas detector, USB cable, adapter for charging, aluminum carry case, user manual, and warranty.

Charging the device

This device uses a rechargeable Li-ion battery. Connect the power cable to the device and the DC adapter via a USB plug and connect it to the AC power supply to charge the device. Fully charge for 6–8 hours. For fast charging, turn the device off.
Do not charge the device in potentially explosive atmospheres.

Getting started
Press the power button (5) and hold it for 3 seconds to turn the device on/off.
The device will start the self-check: the LED indicators will blink twice, the device will emit a short vibration signal and then will beep twice. After the self-check, the device will display the preset information for low alarm value, high alarm value, and the detection range upper limit value.

Settings
Press the power button (5) to enter the menu, to enter a submenu, to confirm the selection, and to save changes. Press the left (4) and right (6) buttons to scroll through the menu. You can view and set the time and date, and you can view the battery status.
You can set a 4-digit password to prevent the device from accidental operation.

Zero adjustment

You can adjust the zero setting according to the actual detection value.
Enter the zero trim submenu, select the gas type, the value, and unit of measurement. Then, save the adjusted value.
For example, if the displayed value is 3 instead of 0, you can set –0004 and save this value: after that the displayed detection value will be 0.

Alarm value setting
You can set the low alarm values and the high alarm values for the device to generate the audible and visible alarm signal when the gas concentration exceeds the set alarm values.

Usage
Gas detection mode is set by default. The system returns to the gas detection mode after 5 seconds of idle time. The device will automatically analyze the gas environment and display the result on the screen.

Normal gas concentration
If the gas concentration is below the low alarm value, the detection result will be displayed on the screen.

Abnormal gas concentration

If the gas concentration is above the alarm value, the LED indicators and the backlight will light on, the device will vibrate and emit a beeping sound, and the current detection value will be displayed on the screen.

Gas type| Detection range| Accuracy| Low alarm| High alarm| Resolution
---|---|---|---|---|---
Oxygen| 0–30% vol.| ±3%| 19.5% vol.| 23.5% vol.| 0.1% vol.
Flammable gas| 0–100% LEL| ±3%| 20% LEL| 50% LEL| 1% LEL
Carbon monoxide| 0–1000ppm| ±3%| 50ppm| 150ppm| 1ppm
Hydroge sulfide| 0–100ppm| ±3%| 10ppm| 20ppm| 1/0.1ppm
Ammonia| 0–100ppm| ±3%| 20ppm| 50ppm| 1/0.1ppm
Hydrogene| 0–1000ppm| ±3%| 200ppm| 500ppm| 1/0.1ppm
Chlorine gas| 0–20ppm| ±3%| 5ppm| 10ppm| 1/0.1ppm
Hydrogene chloride| 0–20ppm| ±3%| 5ppm| 10ppm| 1/0.1ppm
Sulfur dioxide| 0–20ppm| ±3%| 5ppm| 10ppm| 1/0.1ppm
Nitric oxide| 0–250ppm| ±3%| 50ppm| 125ppm| 1/0.1ppm
Nitrogene dioxide| 0–20ppm| ±3%| 5ppm| 10ppm| 1/0.1ppm

The display error for flammable gases is ±5%, for carbon monoxide is ±10%, for hydrogen sulfide is ±5%.

History record
The device can save the records of gas concentration alarms. You can select, view, or clear the records.

Specifications

Combustible gases to be detected| EX* (hydrogen, carbon monoxide, methane, ethane, propane, butane, ethylene, propylene, butene, acetylene, propyne, butyne, hydrogen sulfide, phosphine, etc.)
---|---
Detection range| 0–100% LEL**
Response time| < 30s
Low alarm| 20% LEL
High alarm| 50% LEL
Explosion protection| Ex Ib IIB T3 Gb
Operating temperature range| –20…+50°C (operating), –10…+55°C (storage) /–4… +122°F (operating), –14…+131°F (storage)
Power supply| rechargeable Li-ion battery, 3.7V, 1800mA.h; 24V, 1A adapter for charging

EX – explosive gases
** LEL – lower explosive limit
The manufacturer reserves the right to make changes to the product range and specifications without prior notice.

Care and maintenance

The device is designed to measure the concentration of gas in the air. If you measure high density gas, you might damage the device. Do not use or store the device in the corrosive atmosprers. Store the device in a dry cool place. Do not expose the device to shock, continuous vibrations, or extreme high or low temperatures. Do not try to disassemble the device on your own for any reason. For calibration, repairs and cleaning of any kind, please contact your local specialized service center. Protect the device from sudden impact and excessive mechanical force. Only use accessories and spare parts for this device that comply with the technical specifications. Always use only the recommended cleaning wipes and cleaning tools. Do not use any ethanol- or acetone-based fluids. Never attempt to operate a damaged device or a device with damaged electrical parts! If a part of the device or battery is swallowed, seek medical attention immediately.

Battery safety instructions

The device is equipped with a built-in rechargeable lithium-ion battery.
This avoids frequent battery replacement.
Always switch the device off when not in use.
If the battery charge is low, please recharge the device in time to ensure that the measurements are accurate.
Do not overheat the battery. Do not discharge the battery completely.
Only use the original charger.

Levenhuk International Warranty

Levenhuk products, except for their accessories, carry a 5-year warranty against defects in materials and workmanship. All Levenhuk accessories are warranted to be free of defects in materials and workmanship for six months from the purchase date. The warranty entitles you to the free repair or replacement of the Levenhuk product in any country where a Levenhuk office is located if all the warranty conditions are met.
For further details, please visit: levenhuk.com/warranty

If warranty problems arise, or if you need assistance in using your product, contact the local Levenhuk branch.