Figure 1. Indigo300 transmitter base with screw terminals 1 Rubber lead-through for wiring from the back 2 Cable strain relief clip and its mounting holes. The clip can be installed horizontally or vertically. 3 Probe connection terminals. Delivered pre-wired. 4 Locking wheel or M16×1.5 cable gland for probe connection 5 Lead-through with plug, M16×1.5 cable gland or NPT1/2" conduit fitting 6 Lead-through with plug, M20×1.5 cable gland or NPT1/2" conduit fitting 7 Grounding terminal 8 Power supply input terminals 9 Analog output terminals 10 Enclosure breathing membrane. Do not remove or pierce.