Gas: HCN Range: 0 - 25/30 ppm Dimensions (H x W x D): 156 x 166 x 111mm Operating Temp.: -20 to +55°C Humidity: 0-90% RH Ingress Protection: IP65 Approval EU: ATEX II 1 G EExia IIC T4 (T -40 to +55°C)