QEL Q5 Series

All Models feature an LCD display of gas concentration, LED indication of each of the SPDT relays and TX/RX for the RS-485 or Modbus communications. Pre-calibrated sensors can be purchased and installed by the user, thereby reducing calibration costs and minimizing downtime. Should a client wish to switch from one gas to another, all that is needed is to purchase a sensor/board and install it. The user can select multiple screens from the menu that display relay status, time, TWA, STEL, concentration, and other data. Programming and calibration is non-proprietary and is accessed through a user- electable password that protects system integrity. The units can be installed as stand-alone, digitally networked with QEL or other controllers through an RS-485 or Modbus communication port that is standard. Equally a 4-20 mA, 2-10 VDC and a 1-5 VDC analog output that is fully assignable over a chosen range is standard. User-programmable relays and a buzzer are also standard allowing several options to energize relays through instantaneous activation upon a pre-selected concentration or activation through a time-waited average concentration.