Gas Alarm Systems launches Formaldehyde Monitor (16/08/2007)... comes with the option of Relay Board having 2 x Relays, 1 A, 30 Volts contact rating. In addition it gives 4-20 mA analogue output for PLC, SCADA or BMSThe wall mount model comes with LC Display. There are 2 x DPDT Relays, 30 V, 1 A contact ...