Brief introduction

The GD400 portable composite gas detection alarm is used for portable and rapid detection of 1-4 gas concentrations, temperature and humidity measurements, and alarm for exceeding the standard. The instrument adopts a 2.31-inch high-definition color screen to display concentration in real time, and uses well-known brand gas sensors. The main detection principles include electrochemical, infrared, catalytic combustion, thermal conductivity, and PID photoionization. Advanced circuit design and mature kernel algorithm processing have obtained multiple software copyright patents and appearance patents.

The instrument can detect gas concentrations in pipelines, confined spaces, and atmospheric environments. It can detect gas leaks or high concentration single gas purities with various background gases such as nitrogen or oxygen, and can detect over 500 types of gases.

2、 Functional Features

1. Waterproof, dustproof, explosion-proof, shockproof, intrinsically safe circuit design, anti-static, anti electromagnetic interference,

2. IP65 protection level, built-in water vapor and dust filters to prevent sensor and instrument damage caused by water vapor and dust

3. Built in pump suction measurement, fast response, sampling distance up to 10 meters

4. The 2.31-inch high-definition color screen displays real-time information such as concentration, alarm, time, temperature, humidity, storage, communication, battery level, charging status, etc. The menu interface uses high-definition simulation icons to display the function names of each menu

5. Large capacity data storage function, with a standard storage capacity of 100000 pieces of data, and larger capacity can be customized. Supports real-time storage, scheduled storage, or only storing alarm concentration data and time, supports local viewing and deletion of data, and can also upload data to a computer through a USB interface for analysis, storage, and printing using upper computer software.

6. USB charging interface, can be charged with a computer or power bank, compatible with mobile phone chargers, overcharge, overdischarge, overvoltage, short circuit, overheating protection, 5-level accurate power display, supports USB hot plugging, the detector can work normally during charging, and RS485 communication is optional

7. Adopting 4500mA high-capacity rechargeable polymer battery, it can work continuously for a long time

8. Sound and light alarm, vibration alarm, visual alarm, undervoltage alarm, fault alarm, and multi-directional three-dimensional display of alarm status during alarm.

9. The alarm value can be set, and the alarm methods can be selected from low alarm, high alarm, interval alarm, and weighted average alarm.

10. High precision temperature and humidity measurement (optional), with temperature compensation for the sensor. The instrument operates within a temperature range of -40 to 70 degrees Celsius and can detect gases up to 400 degrees Celsius. Gas detection at higher temperatures can be customized (optional high-temperature sampling, cooling, filtering handle, or high-temperature and high humidity pretreatment system)

11. Can simultaneously detect 1-4 gases, with freely switchable units. Conventional gases do not require input of molecular weight, while special gases require input of molecular weight to automatically calculate and switch. Units available: PPM, mg/m3, Vol%, LEL%, PPHM, ppb, mg/L

12. Three display modes can be switched: simultaneous display of four gas concentrations, large font cyclic display of single channel gas concentration, real-time curve, automatic or manual cycling between channels can be switched, whether to display maximum value, minimum value, gas name can be set, and historical curve graphs can be viewed.

13. Chinese and English interface selectable, default Chinese interface, concise Chinese or English operation prompts

14. Data recovery function, which can selectively restore or fully restore, eliminating the worries caused by misoperation

15. Zero point automatic tracking, long-term use is not affected by zero drift.

16. Third level calibration of the target point ensures the linearity and accuracy of the measurement, and can simultaneously comply with national standards and local metrology bureau standards.

17. Automatic identification and prevention of concentration calibration errors can avoid adverse effects caused by human factors.

18. It can be detected in real-time or timed (for situations where the amount of gas being measured is relatively small), and the pump can be turned off to extend the start-up time when not detected.

19. Capable of recording calibration logs, maintenance logs, troubleshooting strategies, sensor lifespan expiration reminder, and next concentration calibration time reminder function

3、 Technical parameters

Gas detection: single or composite gas, optional: can detect any 1-4 gas concentrations.

Testing range: Refer to the quotation, other ranges can be customized

Resolution: Refer to the quotation, higher resolution can be customized

Detection method: Built in pump suction, flow rate of 500 milliliters per minute

Display mode: 2.31-inch 320X240 high-definition color screen display, 5-button operation

Detection accuracy: ≤± 3% (F.S)

Linearity: ≤± 2%

Repeatability: ≤± 2%

Alarm methods: sound and light alarm, vibration alarm, visual alarm, sound and light+vibration+visual alarm, optional alarm shutdown

Response time: T90 ≤ 20 seconds

Recovery time: ≤ 30 seconds

Working power supply: DC3.7V

Battery capacity: 3.7VDC, 4500mA large capacity rechargeable polymer battery with overcharge, overdischarge, overvoltage, overheating, and short circuit protection functions

Operating environment: Temperature range of -40 ℃ to+70 ℃; Relative humidity ≤ 0-99% RH (built-in filter can be used in high humidity or high dust environments)

Sample gas temperature: -40 ℃~+70 ℃, optional high temperature sampling and cooling filter handle, can detect smoke concentration at 400 degrees or higher temperature

Temperature measurement: -40 ℃~+120 ℃ (optional) with an accuracy of 0.5 ℃

Humidity measurement: 0-100% RH (optional) with an accuracy of 3% RH

Data Storage: Equipped with a standard capacity of 100000 data entries, it supports local viewing, deletion, or data export. It is a free communication software for the upper computer, and the storage function is turned off by default and can be set to on. The storage time interval can be set arbitrarily

Communication interface: USB (charging and communication), optional RS485 or RS232 communication interface

Interface language: Chinese or English can be set, default Chinese interface

Explosion proof type: intrinsic safety type

Explosion proof mark: Exia II CT4 Ga

Protection level: IP65, dustproof and splash proof

Dimensions: 160 × 70 × 28mm (L × W × H)

Weight: 300g

Standard attachments: instruction manual, warranty card, USB charger (including data cable), back clip, humidity dust filter, high-end aluminum alloy instrument box

Optional accessories: 1.2m extendable sampling handle (including 1-meter hose), temperature and humidity measurement function, multiple humidity and dust filters, high temperature sampling and cooling filter handle, high temperature and high humidity pretreatment system, hanging rope, CD (upper computer communication software)

Application scenarios: Petroleum, chemical, pharmaceutical, environmental protection, flue gas analysis, air treatment and all other occasions that require gas concentration detection

Partial detectable gas list (for those not listed, please consult the sales engineer)