DA-500 detects various combustible & toxic gases leaked from industrial areas for gas producers, gas users, gas reservoirs, gas by-producers, and so on, in order to prevent any accidents in advance. DA-500 converts digital signal into the 4-20mA standard current output signal which can be transmitted to various devices such as PLC, DDC, or recorder to build comprehensive gas monitoring system. Also, DA-500 provides RS-485 communication signal and alarm relay contact. DC 4-20mA standard output signal realizes max 2500m long distance output signal transmission and RS-485 communication signal realizes max 1000m long distance signal transmission.
[ Features ]
ㆍ Auto-calibration without opening cover You only have to touch cover window using magnetic bar. It is quite useful for the corrective work in the explosive area.
ㆍ LCD display with back light
ㆍ Built-in HD(high dissolution) A/D converter for accurate output signal.
ㆍ Multi signal output
DC 4-20mA, 2 step-relay contact, & RS-485(option) – provides best networking with all kinds of devices & equipments.
ㆍ 4-20mA transmitter
4-20mA output enables stable and long distance (maximum 2.5km) signal transmission.
ㆍ RS-485
RS-485 enables stables stable and long distance (maximum 1.2km) signal communication.
ㆍ Alarm output
SPST 2 step relay contacts (AL1/AL2).
[ Specification ]
| Detection principle | Catalytic, Electro-Chemical, TCD or NDIR |
| Built-in display | 2-lines x 8-characters LCD with back light |
| Gas sampling | Diffusion type |
| Target gas | Please refer to the target gas list. |
| Measurement range | 0 ~ 100 %LEL, 0~10,000ppm. 0~100% VOL |
| Response time | within 20 seconds, 90%/full scale |
| Accuracy | ≤2% /full scale |
| Sensor displacement | Zero – ≤±2%LEL / 6 month, span -≤±2%LEL / 6 month |
| Input power | DC 20 ~ 30V |
| Output power | 4 ~ 20mA/Full Scale - 2.5km transmission |
| Operating temp.& humidity | -20℃~ 60℃, 5 ~ 95% RH (Non-condensing) |
| Signal cable | CVVS & CVVSB 1.25sq x 3 wire - shield type |
| Wire conduit | 1/2" or 3/4" PF, NPT |
| Installation type | Wall or Pipe Mounting |
| Exterior material | Cast Aluminum Alloy |
| Explosion-proof | Ex d IIC T5 |
| Output | 2 step- relay contact (ALARM-1/ALARM-2) |
| Communication output | RS-485 communication output(option) |
| Sensor operation period | 5 years (in air) |
| Sensor warranty period | 1 year |
