Overview
The GAOPIN NGP5-O2-A Fixed Oxygen Alarm Instrument is an online Gas detector that uses a Thermal Conductivity Principle Sensor to continuously monitor oxygen concentration for 24 hours. The instrument is equipped with a 1.7-inch high definition color screen to display real-time concentration, support on-site sound and light alarm (optional) and remote signal transmission. The rugged explosion-proof housing makes it suitable for various hazardous locations and harsh industrial environments.
Features
1. Units can be switched freely.
2. Diversified communication methods: support wired/wireless remote transmission, network transmission; simultaneously output three-wire system 4~ 20mA standard signal and standard bus RS485 (modbus-RTU); optional frequency output, Hart protocol, 1~ 5V output, two-wire system 4~ 20mA, SMS alarm, wireless transmission; compatible with secondary instrumentation, PLC, DCS and other systems.
3. Standard infrared remote control, support operation without opening the lid in dangerous situations.
4.1.7 inch high definition color screen display real-time concentration and alarm status.
5. Optional high-temperature and high-humidity pretreatment system to detect high-temperature flue gas.
6. Equipped with data recovery function.
7. You can set whether to display MAX Maximum and MIN Minimum.
8. Various alarm methods: including 2 sets of relay switch output, sound and light alarm (optional), display visual alarm; alarm types include concentration alarm and fault alarm.
9. Multiple alarm mode settings: low alarm, high alarm, interval alarm, weighted average alarm.
10. With misoperation identification function, it can automatically identify and prevent concentration calibrating misoperation.
11. Zero automatic tracking, long-term use is not affected by zero drift.
12. Target point multi-level calibrated to ensure Linearity and accuracy of measurement.
13. Chinese or English interface is optional.
14.Wide operation temperature range (-40~ + 70 ℃), support temperature compensation.
15. With logging function, including calibrate, repair, fault record and countermeasures, and provide Sensor life expiration and next calibrate time reminder.
16. Intrinsically safe circuit design, explosion-proof, with secondary lightning protection and anti-static capabilities, in line with EMI and CEMC standards, with anti-reverse connection function.
Principle
The instrument uses a Sensor based on thermal conductivity to detect oxygen concentration. Gas enters the detector by diffusion, and the Sensor converts the gas concentration signal into an electrical signal. After processing by an internal circuit, the real-time concentration value is displayed on the display screen, and data is transmitted through a standard signal output or communication interface.
Applications
Petroleum, chemical industry, metallurgy, refining, gas transmission and distribution, biochemical
Standards
Exia Ⅱ CT6、CNEx15.1283、EMI、CEMC
Steps
1. Install the equipment correctly and choose Wall-Mounted or Pipeline installation.
2. Connect the power supply (12~ 30VDC DC, 24V recommended) and the signal output cable.
3. After power on, the instrument starts, and the concentration display is observed through the 1.7-inch color screen.
4. Use the standard infrared remote control for parameter setting, such as alarm point modification, concentration calibrating, zero point calibrating, etc.
5. According to requirements, connect to the monitoring system via wired or wireless means to achieve remote monitoring and data transmission.
Notice
• When installing, ensure that the connection cable is correct. It is recommended to use a three-core Shielding cable for 4-20mA output, and a four-core cable for RS485 output. For long-distance transmission, the single wire diameter should be ≥ 1.5mm, and the Shielding layer needs to be grounded.
• It is recommended to use a 24V, 2.1A switching power supply for the power supply, and pay attention to the load capacity (can drive 40 toxic Gas detectors or 15 combustible/infrared Gas detectors).
• The instrument has explosion-proof function, but the optional on-site sound and light alarm needs to be confirmed separately according to the explosion-proof requirements.
• When performing concentration calibrating, the instrument has the function of misoperation identification, but it still needs to be operated according to the procedures.
• Sensor life is 2~ 3 years, please pay attention to the life expiration reminder in the instrument log and replace it in time.
• When used in high humidity or high dust environments, rely on the built-in Filter, but require regular maintenance.
• The working environment humidity range is 10~ 95% RH, beyond the range may affect performance.
• Avoid the instrument from being impacted by high-intensity pulse surge current. Although it has a lightning protection design, it is still necessary to pay attention to the power supply environment.
