It features dual redundant Modbus communications, 8-A relays, three-digit display, and 4 to 20-mA output. The unit displays gas concentrations up to 500 ppm, fault codes for troubleshooting, and provides complete status. Up to 128 units can be linked via Modbus output (247 with repeaters).

General Monitors, 26776 Simpatica Circle, Lake Forest, CA 92630, (800) 330-9161,