OPERATION MANUAL - Scintrex

Operating the CS-3 in the FieldPowering UpThe power for the CS-3 should be supplied from a DC supply 24-35V, 2Aminimum supply capability. The power can be connected either througheither:• the coaxial TNC connector by a 50 ohm coaxial cable (centre pin positivewire)• the four pin I/O connector, on pins B (positive wire) and A (negative wire).The sensor electronics is protected from an accidental polarity reversal onboth power inputs.The green light on the side panel indicates that the power is applied to thesensor electronics. Initially, after the power-up, the red indicator light glowsfor a short while to indicate that the cesium lamp located inside the sensorhas not yet reached proper operating level.Normally, this indicator light will go off completely indicating that thecesium lamp is radiating sufficient light. At 25°C it takes normally only fewseconds for this light to go off. At a low ambient temperature, it may takelonger for the lamp exciter to warm up and for the lamp to start to operateproperly.At the beginning of the cold start-up, the power supply current will behighest, approximately 1.5A, as the cell and the lamp heater are operating atthe full output capacity. As the cell and the lamp are approaching the requiredstabilized operating temperature, the supply current will decrease and it willreach steady level which is ambient temperature dependent.At the 20°C the supply current will be approx. 0.5A, at -40°C it is approx.0.7A. The warm-up time is less than 5 minutes at 20°C, increasing to lessthan 15 minutes at -40°C.2-4CS-3 Manual - part # 762701Revision 2.0