OTIS Instruments OI-6000 Fixed Photoionization Detector (PID), Volatile Organic Compounds (0-20 PPM). Includes: Explosion Proof Design for Hazardous Locations, 4-20 mA & RS-485 MODBUS Signal Outputs, and 10.6 eV PID Lamp. Requires 12 to 35 VDC Input Power (3-Wire). OI-6000-PID-VOC20-X-X-O. Note: As options, OTIS OI-6000 series sensor assemblies can be equipped with a 900 MHz GEN II Radio and/or Two Dry Contact Relays.