Description
The Model 505 Transmitter is used with one constant voltage catalytic gas sensor to provide a linear 4 – 20 mA output signal corresponding to a 0 to 100% LFL gas concentration. Intrusive calibration and sensor sensitivity checks are performed using a standard digital voltmeter (not provided). An explosion-proof junction box with removable cover is included with all Model 505 Transmitters. Options include junction box material (aluminum or stainless steel), number of conduit entry ports (up to five), conduit entry threads (NPT or Metric), orientation of entries (180 degree straight-through or 90 degree “L”), and signal output load impedance (125 or 500 ohms).